Update upstream source from tag 'upstream/1.0'

Update to upstream version '1.0'
with Debian dir 1e26108ec9cb2f9b4e35e048ea8f73345a415680

48 files changed, 2901 insertions, 0 deletions

diff --git a/.reuse/dep5 b/.reuse/dep5
new file mode 100644
index 0000000..31dcc3e
--- /dev/null
+++ b/.reuse/dep5
@@ -0,0 +1,17 @@
+Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
+Upstream-Name: Hydrilla builder
+Upstream-Contact: Wojtek Kosior <koszko@koszko.org>
+Source: https://git.koszko.org/hydrilla-builder
+
+Files: PKG-INFO setup.cfg src/hydrilla/builder/_version.py
+       src/hydrilla.builder.egg-info/*
+Copyright: 2022 Wojtek Kosior <koszko@koszko.org>
+License: CC0-1.0
+Comment: Those are files that setuptools generate in sdist.
+ `setup.cfg` gets stripped of comments during generation of
+ sdist, so we include it here as well.
+
+Files: debian/*
+Copyright: 2021,2022 Wojtek Kosior <koszko@koszko.org>
+License: CC0-1.0
+Comment: debian packaging (files only present in debian-debian branch)
diff --git a/LICENSES/0BSD.txt b/LICENSES/0BSD.txt
new file mode 100644
index 0000000..0b8ae76
--- /dev/null
+++ b/LICENSES/0BSD.txt
@@ -0,0 +1,5 @@
+Copyright (C) YEAR by AUTHOR EMAIL
+
+Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby granted.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
diff --git a/LICENSES/AGPL-3.0-or-later.txt b/LICENSES/AGPL-3.0-or-later.txt
new file mode 100644
index 0000000..0c97efd
--- /dev/null
+++ b/LICENSES/AGPL-3.0-or-later.txt
@@ -0,0 +1,235 @@
+GNU AFFERO GENERAL PUBLIC LICENSE
+Version 3, 19 November 2007
+
+Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+
+Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed.
+
+                            Preamble
+
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+
+Notwithstanding any other provision of this License, if you modify the Program, your modified version must prominently offer all users interacting with it remotely through a computer network (if your version supports such interaction) an opportunity to receive the Corresponding Source of your version by providing access to the Corresponding Source from a network server at no charge, through some standard or customary means of facilitating copying of software.  This Corresponding Source shall include the Corresponding Source for any work covered by version 3 of the GNU General Public License that is incorporated pursuant to the following paragraph.
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+
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+END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+If you develop a new program, and you want it to be of the greatest possible use to the public, the best way to achieve this is to make it free software which everyone can redistribute and change under these terms.
+
+To do so, attach the following notices to the program.  It is safest to attach them to the start of each source file to most effectively state the exclusion of warranty; and each file should have at least the "copyright" line and a pointer to where the full notice is found.
+
+     <one line to give the program's name and a brief idea of what it does.>
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+
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+
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+
+Also add information on how to contact you by electronic and paper mail.
+
+If your software can interact with users remotely through a computer network, you should also make sure that it provides a way for users to get its source.  For example, if your program is a web application, its interface could display a "Source" link that leads users to an archive of the code.  There are many ways you could offer source, and different solutions will be better for different programs; see section 13 for the specific requirements.
+
+You should also get your employer (if you work as a programmer) or school, if any, to sign a "copyright disclaimer" for the program, if necessary. For more information on this, and how to apply and follow the GNU AGPL, see <http://www.gnu.org/licenses/>.
diff --git a/LICENSES/CC0-1.0.txt b/LICENSES/CC0-1.0.txt
new file mode 100644
index 0000000..0e259d4
--- /dev/null
+++ b/LICENSES/CC0-1.0.txt
@@ -0,0 +1,121 @@
+Creative Commons Legal Code
+
+CC0 1.0 Universal
+
+    CREATIVE COMMONS CORPORATION IS NOT A LAW FIRM AND DOES NOT PROVIDE
+    LEGAL SERVICES. DISTRIBUTION OF THIS DOCUMENT DOES NOT CREATE AN
+    ATTORNEY-CLIENT RELATIONSHIP. CREATIVE COMMONS PROVIDES THIS
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+    REGARDING THE USE OF THIS DOCUMENT OR THE INFORMATION OR WORKS
+    PROVIDED HEREUNDER, AND DISCLAIMS LIABILITY FOR DAMAGES RESULTING FROM
+    THE USE OF THIS DOCUMENT OR THE INFORMATION OR WORKS PROVIDED
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+
+Statement of Purpose
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+ vi. database rights (such as those arising under Directive 96/9/EC of the
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+     thereof, including any amended or successor version of such
+     directive); and
+vii. other similar, equivalent or corresponding rights throughout the
+     world based on applicable law or treaty, and any national
+     implementations thereof.
+
+2. Waiver. To the greatest extent permitted by, but not in contravention
+of, applicable law, Affirmer hereby overtly, fully, permanently,
+irrevocably and unconditionally waives, abandons, and surrenders all of
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+purposes (the "Waiver"). Affirmer makes the Waiver for the benefit of each
+member of the public at large and to the detriment of Affirmer's heirs and
+successors, fully intending that such Waiver shall not be subject to
+revocation, rescission, cancellation, termination, or any other legal or
+equitable action to disrupt the quiet enjoyment of the Work by the public
+as contemplated by Affirmer's express Statement of Purpose.
+
+3. Public License Fallback. Should any part of the Waiver for any reason
+be judged legally invalid or ineffective under applicable law, then the
+Waiver shall be preserved to the maximum extent permitted taking into
+account Affirmer's express Statement of Purpose. In addition, to the
+extent the Waiver is so judged Affirmer hereby grants to each affected
+person a royalty-free, non transferable, non sublicensable, non exclusive,
+irrevocable and unconditional license to exercise Affirmer's Copyright and
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+"License"). The License shall be deemed effective as of the date CC0 was
+applied by Affirmer to the Work. Should any part of the License for any
+reason be judged legally invalid or ineffective under applicable law, such
+partial invalidity or ineffectiveness shall not invalidate the remainder
+of the License, and in such case Affirmer hereby affirms that he or she
+will not (i) exercise any of his or her remaining Copyright and Related
+Rights in the Work or (ii) assert any associated claims and causes of
+action with respect to the Work, in either case contrary to Affirmer's
+express Statement of Purpose.
+
+4. Limitations and Disclaimers.
+
+ a. No trademark or patent rights held by Affirmer are waived, abandoned,
+    surrendered, licensed or otherwise affected by this document.
+ b. Affirmer offers the Work as-is and makes no representations or
+    warranties of any kind concerning the Work, express, implied,
+    statutory or otherwise, including without limitation warranties of
+    title, merchantability, fitness for a particular purpose, non
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+    the greatest extent permissible under applicable law.
+ c. Affirmer disclaims responsibility for clearing rights of other persons
+    that may apply to the Work or any use thereof, including without
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+    Further, Affirmer disclaims responsibility for obtaining any necessary
+    consents, permissions or other rights required for any use of the
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+ d. Affirmer understands and acknowledges that Creative Commons is not a
+    party to this document and has no duty or obligation with respect to
+    this CC0 or use of the Work.
diff --git a/MANIFEST.in b/MANIFEST.in
new file mode 100644
index 0000000..b80abf7
--- /dev/null
+++ b/MANIFEST.in
@@ -0,0 +1,12 @@
+# SPDX-License-Identifier: CC0-1.0
+
+# Copyright (C) 2022 Wojtek Kosior <koszko@koszko.org>
+#
+# Available under the terms of Creative Commons Zero v1.0 Universal.
+
+include src/hydrilla/schemas/*.schema.json*
+include src/hydrilla/builder/locales/*/LC_MESSAGES/hydrilla-messages.po
+include tests/source-package-example/*
+include tests/source-package-example/LICENSES/*
+include tests/source-package-example/.reuse/*
+global-exclude .git .gitignore .gitmodules
diff --git a/PKG-INFO b/PKG-INFO
new file mode 100644
index 0000000..7724a25
--- /dev/null
+++ b/PKG-INFO
@@ -0,0 +1,89 @@
+Metadata-Version: 2.1
+Name: hydrilla.builder
+Version: 1.0
+Summary: Hydrilla package builder
+Home-page: https://git.koszko.org/hydrilla-builder
+Author: Wojtek Kosior
+Author-email: koszko@koszko.org
+License: AGPL-3.0-or-later
+Project-URL: Bug Tracker, https://hydrillabugs.koszko.org/projects/hydrilla
+Description: # Hydrilla builder
+        
+        This is the repository of the builder part of [Hydrilla](https://hydrillabugs.koszko.org/projects/hydrilla/wiki). You can find the repository of its server part [here](https://git.koszko.org/pydrilla/).
+        
+        Hydrilla builder is a tool to create Haketilo packages in serveable form. The information below is meant to help hack on the codebase. If you're instead looking for some noob-friendly documentation, see the [user manual](https://hydrillabugs.koszko.org/projects/hydrilla/wiki/User_manual).
+        
+        ## Dependencies
+        
+        ### Runtime
+        
+        * Python3 (>= 3.7)
+        * click
+        * jsonschema (>= 3.0)
+        * reuse [optional]
+        
+        ### Build
+        
+        * setuptools
+        * wheel
+        * setuptools_scm
+        * babel
+        
+        ### Test
+        
+        * pytest
+        * reuse
+        
+        ## Building & testing
+        
+        Build and test processed are analogous to those described in the [README of Hydrilla server part](https://git.koszko.org/pydrilla/about).
+        
+        ## Running
+        
+        This package provides a hydrilla-builder command. You can use it to build the supplied example with something along the lines of:
+        
+        ```
+        mkdir /tmp/bananowarzez/
+        hydrilla-builder -s src/test/source-package-example/ -d /tmp/bananowarzez/
+        # Now, list the serveable package files we just produced.
+        find /tmp/bananowarzez/
+        ```
+        
+        You might as well like to run from sources, without installation:
+        mkdir /tmp/bananowarzez/
+        ./setup.py compile_catalog # generate the necessary .po files
+        PYTHONPATH=src python3 -m hydrilla.builder -s src/test/source-package-example/ \
+        	       -d /tmp/bananowarzez/
+        ```
+        
+        You can also consult the included manpage (`man` tool required):
+        ``` shell
+        man ./doc/man/man1/hydrilla-builder.1
+        ```
+        
+        ## Copying
+        
+        Hydrilla is Copyright (C) 2021-2022 Wojtek Kosior and contributors, entirely available under the GNU Affero General Public License version 3 or later. Some files might also give you broader permissions, see comments inside them.
+        
+        *I, Wojtek Kosior, thereby promise not to sue for violation of this project's license. Although I request that you do not make use this code in a proprietary program, I am not going to enforce this in court.*
+        
+        ## Contributing
+        
+        Please visit our Redmine instance at https://hydrillabugs.koszko.org.
+        
+        You can also write an email to koszko@koszko.org.
+        
+Keywords: hydrilla,haketilo
+Platform: UNKNOWN
+Classifier: Development Status :: 4 - Beta
+Classifier: Intended Audience :: Developers
+Classifier: Environment :: Console
+Classifier: License :: OSI Approved :: GNU Affero General Public License v3 or later (AGPLv3+)
+Classifier: Natural Language :: English
+Classifier: Operating System :: OS Independent
+Classifier: Programming Language :: Python :: 3 :: Only
+Classifier: Topic :: Software Development :: Build Tools
+Requires-Python: >=3.7
+Description-Content-Type: text/markdown
+Provides-Extra: setup
+Provides-Extra: test
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..1b91a7f
--- /dev/null
+++ b/README.md
@@ -0,0 +1,65 @@
+# Hydrilla builder
+
+This is the repository of the builder part of [Hydrilla](https://hydrillabugs.koszko.org/projects/hydrilla/wiki). You can find the repository of its server part [here](https://git.koszko.org/pydrilla/).
+
+Hydrilla builder is a tool to create Haketilo packages in serveable form. The information below is meant to help hack on the codebase. If you're instead looking for some noob-friendly documentation, see the [user manual](https://hydrillabugs.koszko.org/projects/hydrilla/wiki/User_manual).
+
+## Dependencies
+
+### Runtime
+
+* Python3 (>= 3.7)
+* click
+* jsonschema (>= 3.0)
+* reuse [optional]
+
+### Build
+
+* setuptools
+* wheel
+* setuptools_scm
+* babel
+
+### Test
+
+* pytest
+* reuse
+
+## Building & testing
+
+Build and test processed are analogous to those described in the [README of Hydrilla server part](https://git.koszko.org/pydrilla/about).
+
+## Running
+
+This package provides a hydrilla-builder command. You can use it to build the supplied example with something along the lines of:
+
+```
+mkdir /tmp/bananowarzez/
+hydrilla-builder -s src/test/source-package-example/ -d /tmp/bananowarzez/
+# Now, list the serveable package files we just produced.
+find /tmp/bananowarzez/
+```
+
+You might as well like to run from sources, without installation:
+mkdir /tmp/bananowarzez/
+./setup.py compile_catalog # generate the necessary .po files
+PYTHONPATH=src python3 -m hydrilla.builder -s src/test/source-package-example/ \
+	       -d /tmp/bananowarzez/
+```
+
+You can also consult the included manpage (`man` tool required):
+``` shell
+man ./doc/man/man1/hydrilla-builder.1
+```
+
+## Copying
+
+Hydrilla is Copyright (C) 2021-2022 Wojtek Kosior and contributors, entirely available under the GNU Affero General Public License version 3 or later. Some files might also give you broader permissions, see comments inside them.
+
+*I, Wojtek Kosior, thereby promise not to sue for violation of this project's license. Although I request that you do not make use this code in a proprietary program, I am not going to enforce this in court.*
+
+## Contributing
+
+Please visit our Redmine instance at https://hydrillabugs.koszko.org.
+
+You can also write an email to koszko@koszko.org.
diff --git a/README.md.license b/README.md.license
new file mode 100644
index 0000000..baf2b81
--- /dev/null
+++ b/README.md.license
@@ -0,0 +1,5 @@
+SPDX-License-Identifier: CC0-1.0
+
+Copyright (C) 2022 Wojtek Kosior
+
+Available under the terms of Creative Commons Zero v1.0 Universal.
diff --git a/doc/man/man1/hydrilla-builder.1 b/doc/man/man1/hydrilla-builder.1
new file mode 100644
index 0000000..f58ab97
--- /dev/null
+++ b/doc/man/man1/hydrilla-builder.1
@@ -0,0 +1,94 @@
+.\" SPDX-License-Identifier: CC0-1.0
+.\"
+.\" Man page for Hydrilla builder.
+.\"
+.\" Copyright (C) 2022 Wojtek Kosior <koszko@koszko.org>
+.\"
+.\" Available under the terms of Creative Commons Zero v1.0 Universal.
+
+.TH HYDRILLA-BUILDER 1 2022-04-22 "Hydrilla 1.0" "Hydrilla Manual"
+
+.SH NAME
+hydrilla-builder \- Generate packages to be served by Hydrilla
+
+.SH SYNOPSIS
+.B "hydrilla\-builder \-\-help"
+.br
+.B "hydrilla\-builder [\-s \fISOURCE\/\fP] [\-i\ \fIINDEX_PATH\/\fP]"
+.B "\-d \fIDESTINATION\/\fP"
+.br
+(See the OPTIONS section for alternate option syntax with long option
+names.)
+
+.SH DESCRIPTION
+.I hydrilla-builder
+is a tool which takes a Hydrilla source package and generates files of a
+built package, suitable for serving by the Hydrilla server.
+
+As of Hydrilla version 1.0
+.I hydrilla-builder
+does not yet perform nor trigger actions like compilation, minification or
+bundling of source code files. Its main function is to automate the process
+of computing SHA256 cryptographic sums of package files and including them
+in JSON definitions.
+
+In addition,
+.B hydrilla\-builder
+can generate an SPDX report from source package if the
+\*(lqreuse_generate_spdx_report\*(rq property is set to true in index.json.
+
+.SH OPTIONS
+.TP
+.B \-\^\-help
+Output a usage message and exit.
+
+.TP
+.BI \-s " SOURCE" "\fR,\fP \-\^\-srcdir=" SOURCE
+Use
+.I SOURCE
+as source package directory to build from.
+If not specified, current directory is used.
+
+.TP
+.BI \-i " INDEX_PATH" "\fR,\fP \-\^\-index\-json=" INDEX_PATH
+Process the JSON file under
+.I INDEX_PATH
+instead of index.json inside source directory.
+.I INDEX_PATH
+may be either absolute or relative.
+In the latter case it is resolved with respect to the source directory.
+
+File provided as
+.I INDEX_PATH
+will also be included in the generated source archive as
+\*(lqindex.json\*(rq, substituting any file with such name that could be
+present in the source directory.
+
+.TP
+.BI \-d " DESTINATION" "\fR,\fP \-\^\-dstdir=" DESTINATION
+Write generated files under
+.IR DESTINATION .
+Files are written in such way that
+.I DESTINATION
+is valid for being passed to Hydrilla to serve packages from.
+
+.TP
+.B \-\^\-version
+Show version information for this instance of
+.I hydrilla-builder
+on the standard output and exit successfully.
+
+.SH "EXIT STATUS"
+The exit status is 0 if build was performed successfully or if the
+.B \-\^\-help
+option was passed. It is a number different from 0 in all other cases.
+
+.SH "SEE ALSO"
+.SS "Manual Pages"
+.BR hydrilla (1).
+
+.SS "Full Documentation"
+.UR https://hydrillabugs.koszko.org/projects/hydrilla/wiki
+Online documentation
+.UE
+is available on Hydrilla issue tracker.
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..968455f
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,19 @@
+# SPDX-License-Identifier: CC0-1.0
+
+# Copyright (C) 2022 Wojtek Kosior <koszko@koszko.org>
+#
+# Available under the terms of Creative Commons Zero v1.0 Universal.
+
+[build-system]
+build-backend = "setuptools.build_meta"
+requires = ["setuptools>=44", "wheel", "setuptools_scm>=5.0", "babel"]
+
+[tool.setuptools_scm]
+write_to = "src/hydrilla/builder/_version.py"
+
+[tool.pytest.ini_options]
+minversion = "6.0"
+addopts = "-ra -q"
+testpaths = [
+    "tests"
+]
diff --git a/setup.cfg b/setup.cfg
new file mode 100644
index 0000000..6ca397f
--- /dev/null
+++ b/setup.cfg
@@ -0,0 +1,77 @@
+[metadata]
+name = hydrilla.builder
+author = Wojtek Kosior
+author_email = koszko@koszko.org
+description = Hydrilla package builder
+long_description = file: README.md
+long_description_content_type = text/markdown
+url = https://git.koszko.org/hydrilla-builder
+project_urls = 
+	Bug Tracker = https://hydrillabugs.koszko.org/projects/hydrilla
+keywords = hydrilla, haketilo
+license = AGPL-3.0-or-later
+classifiers = 
+	Development Status :: 4 - Beta
+	Intended Audience :: Developers
+	Environment :: Console
+	License :: OSI Approved :: GNU Affero General Public License v3 or later (AGPLv3+)
+	Natural Language :: English
+	Operating System :: OS Independent
+	Programming Language :: Python :: 3 :: Only
+	Topic :: Software Development :: Build Tools
+
+[options]
+zip_safe = False
+package_dir = 
+	= src
+packages = find:
+include_package_data = True
+python_requires = >= 3.7
+install_requires = 
+	click
+	jsonschema>=3.0
+
+[options.package_data]
+hydrilla.builder = locales/*/LC_MESSAGES/hydrilla-messages.mo
+
+[options.extras_require]
+test = pytest
+setup = setuptools_scm
+
+[options.packages.find]
+where = src
+exclude = 
+	test
+
+[options.entry_points]
+console_scripts = 
+	hydrilla-builder = hydrilla.builder.build:perform
+
+[extract_messages]
+keywords = _
+width = 80
+input_dirs = src/hydrilla
+output_file = src/hydrilla/builder/locales/hydrilla-messages.pot
+msgid_bugs_address = koszko@koszko.org
+sort_by_file = True
+copyright_holder = Wojtek Kosior <koszko@koszko.org>
+
+[init_catalog]
+input_file = src/hydrilla/builder/locales/hydrilla-messages.pot
+output_dir = src/hydrilla/builder/locales/
+domain = hydrilla-messages
+
+[update_catalog]
+input_file = src/hydrilla/builder/locales/hydrilla-messages.pot
+output_dir = src/hydrilla/builder/locales/
+domain = hydrilla-messages
+
+[compile_catalog]
+directory = src/hydrilla/builder/locales
+use_fuzzy = True
+domain = hydrilla-messages
+
+[egg_info]
+tag_build = 
+tag_date = 0
+
diff --git a/setup.py b/setup.py
new file mode 100755
index 0000000..345febc
--- /dev/null
+++ b/setup.py
@@ -0,0 +1,20 @@
+#!/usr/bin/env python3
+# SPDX-License-Identifier: CC0-1.0
+
+# Copyright (C) 2022 Wojtek Kosior <koszko@koszko.org>
+#
+# Available under the terms of Creative Commons Zero v1.0 Universal.
+
+import setuptools
+
+from setuptools.command.build_py import build_py
+
+class CustomBuildCommand(build_py):
+    '''
+    The build command but runs babel before build.
+    '''
+    def run(self, *args, **kwargs):
+        self.run_command('compile_catalog')
+        super().run(*args, **kwargs)
+
+setuptools.setup(cmdclass={'build_py': CustomBuildCommand})
diff --git a/src/hydrilla.builder.egg-info/PKG-INFO b/src/hydrilla.builder.egg-info/PKG-INFO
new file mode 100644
index 0000000..7724a25
--- /dev/null
+++ b/src/hydrilla.builder.egg-info/PKG-INFO
@@ -0,0 +1,89 @@
+Metadata-Version: 2.1
+Name: hydrilla.builder
+Version: 1.0
+Summary: Hydrilla package builder
+Home-page: https://git.koszko.org/hydrilla-builder
+Author: Wojtek Kosior
+Author-email: koszko@koszko.org
+License: AGPL-3.0-or-later
+Project-URL: Bug Tracker, https://hydrillabugs.koszko.org/projects/hydrilla
+Description: # Hydrilla builder
+        
+        This is the repository of the builder part of [Hydrilla](https://hydrillabugs.koszko.org/projects/hydrilla/wiki). You can find the repository of its server part [here](https://git.koszko.org/pydrilla/).
+        
+        Hydrilla builder is a tool to create Haketilo packages in serveable form. The information below is meant to help hack on the codebase. If you're instead looking for some noob-friendly documentation, see the [user manual](https://hydrillabugs.koszko.org/projects/hydrilla/wiki/User_manual).
+        
+        ## Dependencies
+        
+        ### Runtime
+        
+        * Python3 (>= 3.7)
+        * click
+        * jsonschema (>= 3.0)
+        * reuse [optional]
+        
+        ### Build
+        
+        * setuptools
+        * wheel
+        * setuptools_scm
+        * babel
+        
+        ### Test
+        
+        * pytest
+        * reuse
+        
+        ## Building & testing
+        
+        Build and test processed are analogous to those described in the [README of Hydrilla server part](https://git.koszko.org/pydrilla/about).
+        
+        ## Running
+        
+        This package provides a hydrilla-builder command. You can use it to build the supplied example with something along the lines of:
+        
+        ```
+        mkdir /tmp/bananowarzez/
+        hydrilla-builder -s src/test/source-package-example/ -d /tmp/bananowarzez/
+        # Now, list the serveable package files we just produced.
+        find /tmp/bananowarzez/
+        ```
+        
+        You might as well like to run from sources, without installation:
+        mkdir /tmp/bananowarzez/
+        ./setup.py compile_catalog # generate the necessary .po files
+        PYTHONPATH=src python3 -m hydrilla.builder -s src/test/source-package-example/ \
+        	       -d /tmp/bananowarzez/
+        ```
+        
+        You can also consult the included manpage (`man` tool required):
+        ``` shell
+        man ./doc/man/man1/hydrilla-builder.1
+        ```
+        
+        ## Copying
+        
+        Hydrilla is Copyright (C) 2021-2022 Wojtek Kosior and contributors, entirely available under the GNU Affero General Public License version 3 or later. Some files might also give you broader permissions, see comments inside them.
+        
+        *I, Wojtek Kosior, thereby promise not to sue for violation of this project's license. Although I request that you do not make use this code in a proprietary program, I am not going to enforce this in court.*
+        
+        ## Contributing
+        
+        Please visit our Redmine instance at https://hydrillabugs.koszko.org.
+        
+        You can also write an email to koszko@koszko.org.
+        
+Keywords: hydrilla,haketilo
+Platform: UNKNOWN
+Classifier: Development Status :: 4 - Beta
+Classifier: Intended Audience :: Developers
+Classifier: Environment :: Console
+Classifier: License :: OSI Approved :: GNU Affero General Public License v3 or later (AGPLv3+)
+Classifier: Natural Language :: English
+Classifier: Operating System :: OS Independent
+Classifier: Programming Language :: Python :: 3 :: Only
+Classifier: Topic :: Software Development :: Build Tools
+Requires-Python: >=3.7
+Description-Content-Type: text/markdown
+Provides-Extra: setup
+Provides-Extra: test
diff --git a/src/hydrilla.builder.egg-info/SOURCES.txt b/src/hydrilla.builder.egg-info/SOURCES.txt
new file mode 100644
index 0000000..de24145
--- /dev/null
+++ b/src/hydrilla.builder.egg-info/SOURCES.txt
@@ -0,0 +1,47 @@
+MANIFEST.in
+README.md
+README.md.license
+pyproject.toml
+setup.cfg
+setup.py
+.reuse/dep5
+LICENSES/0BSD.txt
+LICENSES/AGPL-3.0-or-later.txt
+LICENSES/CC0-1.0.txt
+doc/man/man1/hydrilla-builder.1
+src/hydrilla/__init__.py
+src/hydrilla.builder.egg-info/PKG-INFO
+src/hydrilla.builder.egg-info/SOURCES.txt
+src/hydrilla.builder.egg-info/dependency_links.txt
+src/hydrilla.builder.egg-info/entry_points.txt
+src/hydrilla.builder.egg-info/not-zip-safe
+src/hydrilla.builder.egg-info/requires.txt
+src/hydrilla.builder.egg-info/top_level.txt
+src/hydrilla/builder/__init__.py
+src/hydrilla/builder/__main__.py
+src/hydrilla/builder/_version.py
+src/hydrilla/builder/build.py
+src/hydrilla/builder/locales/en_US/LC_MESSAGES/hydrilla-messages.po
+src/hydrilla/schemas/api_mapping_description-1.0.1.schema.json
+src/hydrilla/schemas/api_mapping_description-1.0.1.schema.json.license
+src/hydrilla/schemas/api_query_result-1.0.1.schema.json
+src/hydrilla/schemas/api_query_result-1.0.1.schema.json.license
+src/hydrilla/schemas/api_resource_description-1.0.1.schema.json
+src/hydrilla/schemas/api_resource_description-1.0.1.schema.json.license
+src/hydrilla/schemas/api_source_description-1.0.1.schema.json
+src/hydrilla/schemas/api_source_description-1.0.1.schema.json.license
+src/hydrilla/schemas/common_definitions-1.0.1.schema.json
+src/hydrilla/schemas/common_definitions-1.0.1.schema.json.license
+src/hydrilla/schemas/package_source-1.0.1.schema.json
+src/hydrilla/schemas/package_source-1.0.1.schema.json.license
+src/hydrilla/util/__init__.py
+src/hydrilla/util/_util.py
+tests/test_hydrilla_builder.py
+tests/source-package-example/README.txt
+tests/source-package-example/README.txt.license
+tests/source-package-example/bye.js
+tests/source-package-example/hello.js
+tests/source-package-example/index.json
+tests/source-package-example/message.js
+tests/source-package-example/.reuse/dep5
+tests/source-package-example/LICENSES/CC0-1.0.txt
\ No newline at end of file
diff --git a/src/hydrilla.builder.egg-info/dependency_links.txt b/src/hydrilla.builder.egg-info/dependency_links.txt
new file mode 100644
index 0000000..8b13789
--- /dev/null
+++ b/src/hydrilla.builder.egg-info/dependency_links.txt
@@ -0,0 +1 @@
+
diff --git a/src/hydrilla.builder.egg-info/entry_points.txt b/src/hydrilla.builder.egg-info/entry_points.txt
new file mode 100644
index 0000000..fe46978
--- /dev/null
+++ b/src/hydrilla.builder.egg-info/entry_points.txt
@@ -0,0 +1,3 @@
+[console_scripts]
+hydrilla-builder = hydrilla.builder.build:perform
+
diff --git a/src/hydrilla.builder.egg-info/not-zip-safe b/src/hydrilla.builder.egg-info/not-zip-safe
new file mode 100644
index 0000000..8b13789
--- /dev/null
+++ b/src/hydrilla.builder.egg-info/not-zip-safe
@@ -0,0 +1 @@
+
diff --git a/src/hydrilla.builder.egg-info/requires.txt b/src/hydrilla.builder.egg-info/requires.txt
new file mode 100644
index 0000000..4a40137
--- /dev/null
+++ b/src/hydrilla.builder.egg-info/requires.txt
@@ -0,0 +1,8 @@
+click
+jsonschema>=3.0
+
+[setup]
+setuptools_scm
+
+[test]
+pytest
diff --git a/src/hydrilla.builder.egg-info/top_level.txt b/src/hydrilla.builder.egg-info/top_level.txt
new file mode 100644
index 0000000..85c40e2
--- /dev/null
+++ b/src/hydrilla.builder.egg-info/top_level.txt
@@ -0,0 +1 @@
+hydrilla
diff --git a/src/hydrilla/__init__.py b/src/hydrilla/__init__.py
new file mode 100644
index 0000000..6aeb276
--- /dev/null
+++ b/src/hydrilla/__init__.py
@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: 0BSD
+
+# Copyright (C) 2013-2020, PyPA
+
+# https://packaging.python.org/en/latest/guides/packaging-namespace-packages/#pkgutil-style-namespace-packages
+
+__path__ = __import__('pkgutil').extend_path(__path__, __name__)
diff --git a/src/hydrilla/builder/__init__.py b/src/hydrilla/builder/__init__.py
new file mode 100644
index 0000000..73dc579
--- /dev/null
+++ b/src/hydrilla/builder/__init__.py
@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: CC0-1.0
+
+# Copyright (C) 2022 Wojtek Kosior <koszko@koszko.org>
+#
+# Available under the terms of Creative Commons Zero v1.0 Universal.
+
+from .build import Build
diff --git a/src/hydrilla/builder/__main__.py b/src/hydrilla/builder/__main__.py
new file mode 100644
index 0000000..87dc9e2
--- /dev/null
+++ b/src/hydrilla/builder/__main__.py
@@ -0,0 +1,9 @@
+# SPDX-License-Identifier: CC0-1.0
+
+# Copyright (C) 2022 Wojtek Kosior <koszko@koszko.org>
+#
+# Available under the terms of Creative Commons Zero v1.0 Universal.
+
+from . import build
+
+build.perform()
diff --git a/src/hydrilla/builder/_version.py b/src/hydrilla/builder/_version.py
new file mode 100644
index 0000000..d953eef
--- /dev/null
+++ b/src/hydrilla/builder/_version.py
@@ -0,0 +1,5 @@
+# coding: utf-8
+# file generated by setuptools_scm
+# don't change, don't track in version control
+version = '1.0'
+version_tuple = (1, 0)
diff --git a/src/hydrilla/builder/build.py b/src/hydrilla/builder/build.py
new file mode 100644
index 0000000..8eec4a4
--- /dev/null
+++ b/src/hydrilla/builder/build.py
@@ -0,0 +1,417 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+# Building Hydrilla packages.
+#
+# This file is part of Hydrilla
+#
+# Copyright (C) 2022 Wojtek Kosior
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as
+# published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+#
+#
+# I, Wojtek Kosior, thereby promise not to sue for violation of this
+# file's license. Although I request that you do not make use this code
+# in a proprietary program, I am not going to enforce this in court.
+
+# Enable using with Python 3.7.
+from __future__ import annotations
+
+import json
+import re
+import zipfile
+from pathlib import Path
+from hashlib import sha256
+from sys import stderr
+
+import jsonschema
+import click
+
+from .. import util
+from . import _version
+
+here = Path(__file__).resolve().parent
+
+_ = util.translation(here / 'locales').gettext
+
+index_validator = util.validator_for('package_source-1.0.1.schema.json')
+
+schemas_root = 'https://hydrilla.koszko.org/schemas'
+
+generated_by = {
+    'name': 'hydrilla.builder',
+    'version': _version.version
+}
+
+class FileReferenceError(Exception):
+    """
+    Exception used to report various problems concerning files referenced from
+    source package's index.json.
+    """
+
+class ReuseError(Exception):
+    """
+    Exception used to report various problems when calling the REUSE tool.
+    """
+
+class FileBuffer:
+    """
+    Implement a file-like object that buffers data written to it.
+    """
+    def __init__(self):
+        """
+        Initialize FileBuffer.
+        """
+        self.chunks = []
+
+    def write(self, b):
+        """
+        Buffer 'b', return number of bytes buffered.
+
+        'b' is expected to be an instance of 'bytes' or 'str', in which case it
+        gets encoded as UTF-8.
+        """
+        if type(b) is str:
+            b = b.encode()
+        self.chunks.append(b)
+        return len(b)
+
+    def flush(self):
+        """
+        A no-op mock of file-like object's flush() method.
+        """
+        pass
+
+    def get_bytes(self):
+        """
+        Return all data written so far concatenated into a single 'bytes'
+        object.
+        """
+        return b''.join(self.chunks)
+
+def generate_spdx_report(root):
+    """
+    Use REUSE tool to generate an SPDX report for sources under 'root' and
+    return the report's contents as 'bytes'.
+
+    'root' shall be an instance of pathlib.Path.
+
+    In case the directory tree under 'root' does not constitute a
+    REUSE-compliant package, linting report is printed to standard output and
+    an exception is raised.
+
+    In case the reuse package is not installed, an exception is also raised.
+    """
+    try:
+        from reuse._main import main as reuse_main
+    except ModuleNotFoundError:
+        raise ReuseError(_('couldnt_import_reuse_is_it_installed'))
+
+    mocked_output = FileBuffer()
+    if reuse_main(args=['--root', str(root), 'lint'], out=mocked_output) != 0:
+        stderr.write(mocked_output.get_bytes().decode())
+        raise ReuseError(_('spdx_report_from_reuse_incompliant'))
+
+    mocked_output = FileBuffer()
+    if reuse_main(args=['--root', str(root), 'spdx'], out=mocked_output) != 0:
+        stderr.write(mocked_output.get_bytes().decode())
+        raise ReuseError("Couldn't generate an SPDX report for package.")
+
+    return mocked_output.get_bytes()
+
+class FileRef:
+    """Represent reference to a file in the package."""
+    def __init__(self, path: Path, contents: bytes):
+        """Initialize FileRef."""
+        self.include_in_distribution = False
+        self.include_in_zipfile      = True
+        self.path                    = path
+        self.contents                = contents
+
+        self.contents_hash = sha256(contents).digest().hex()
+
+    def make_ref_dict(self, filename: str):
+        """
+        Represent the file reference through a dict that can be included in JSON
+        defintions.
+        """
+        return {
+            'file':   filename,
+            'sha256': self.contents_hash
+        }
+
+class Build:
+    """
+    Build a Hydrilla package.
+    """
+    def __init__(self, srcdir, index_json_path):
+        """
+        Initialize a build. All files to be included in a distribution package
+        are loaded into memory, all data gets validated and all necessary
+        computations (e.g. preparing of hashes) are performed.
+
+        'srcdir' and 'index_json' are expected to be pathlib.Path objects.
+        """
+        self.srcdir          = srcdir.resolve()
+        self.index_json_path = index_json_path
+        self.files_by_path   = {}
+        self.resource_list   = []
+        self.mapping_list    = []
+
+        if not index_json_path.is_absolute():
+            self.index_json_path = (self.srcdir / self.index_json_path)
+
+        self.index_json_path = self.index_json_path.resolve()
+
+        with open(self.index_json_path, 'rt') as index_file:
+            index_json_text = index_file.read()
+
+        index_obj = json.loads(util.strip_json_comments(index_json_text))
+
+        self.files_by_path[self.srcdir / 'index.json'] = \
+            FileRef(self.srcdir / 'index.json', index_json_text.encode())
+
+        self._process_index_json(index_obj)
+
+    def _process_file(self, filename: str, include_in_distribution: bool=True):
+        """
+        Resolve 'filename' relative to srcdir, load it to memory (if not loaded
+        before), compute its hash and store its information in
+        'self.files_by_path'.
+
+        'filename' shall represent a relative path using '/' as a separator.
+
+        if 'include_in_distribution' is True it shall cause the file to not only
+        be included in the source package's zipfile, but also written as one of
+        built package's files.
+
+        Return file's reference object that can be included in JSON defintions
+        of various kinds.
+        """
+        path = self.srcdir
+        for segment in filename.split('/'):
+            path /= segment
+
+        path = path.resolve()
+        if not path.is_relative_to(self.srcdir):
+            raise FileReferenceError(_('loading_{}_outside_package_dir')
+                                     .format(filename))
+
+        if str(path.relative_to(self.srcdir)) == 'index.json':
+            raise FileReferenceError(_('loading_reserved_index_json'))
+
+        file_ref = self.files_by_path.get(path)
+        if file_ref is None:
+            with open(path, 'rb') as file_handle:
+                contents = file_handle.read()
+
+            file_ref = FileRef(path, contents)
+            self.files_by_path[path] = file_ref
+
+        if include_in_distribution:
+            file_ref.include_in_distribution = True
+
+        return file_ref.make_ref_dict(filename)
+
+    def _prepare_source_package_zip(self, root_dir_name: str):
+        """
+        Create and store in memory a .zip archive containing files needed to
+        build this source package.
+
+        'root_dir_name' shall not contain any slashes ('/').
+
+        Return zipfile's sha256 sum's hexstring.
+        """
+        fb = FileBuffer()
+        root_dir_path = Path(root_dir_name)
+
+        def zippath(file_path):
+            file_path = root_dir_path / file_path.relative_to(self.srcdir)
+            return file_path.as_posix()
+
+        with zipfile.ZipFile(fb, 'w') as xpi:
+            for file_ref in self.files_by_path.values():
+                if file_ref.include_in_zipfile:
+                    xpi.writestr(zippath(file_ref.path), file_ref.contents)
+
+        self.source_zip_contents = fb.get_bytes()
+
+        return sha256(self.source_zip_contents).digest().hex()
+
+    def _process_item(self, item_def: dict):
+        """
+        Process 'item_def' as definition of a resource/mapping and store in
+        memory its processed form and files used by it.
+
+        Return a minimal item reference suitable for using in source
+        description.
+        """
+        copy_props = ['type', 'identifier', 'long_name', 'description']
+        for prop in ('comment', 'uuid'):
+            if prop in item_def:
+                copy_props.append(prop)
+
+        if item_def['type'] == 'resource':
+            item_list = self.resource_list
+
+            copy_props.append('revision')
+
+            script_file_refs = [self._process_file(f['file'])
+                                for f in item_def.get('scripts', [])]
+
+            deps = [{'identifier': res_ref['identifier']}
+                    for res_ref in item_def.get('dependencies', [])]
+
+            new_item_obj = {
+                'dependencies': deps,
+                'scripts':      script_file_refs
+            }
+        else:
+            item_list = self.mapping_list
+
+            payloads = {}
+            for pat, res_ref in item_def.get('payloads', {}).items():
+                payloads[pat] = {'identifier': res_ref['identifier']}
+
+            new_item_obj = {
+                'payloads': payloads
+            }
+
+        new_item_obj.update([(p, item_def[p]) for p in copy_props])
+
+        new_item_obj['version'] = util.normalize_version(item_def['version'])
+        new_item_obj['$schema'] = f'{schemas_root}/api_{item_def["type"]}_description-1.schema.json'
+        new_item_obj['source_copyright'] = self.copyright_file_refs
+        new_item_obj['source_name'] = self.source_name
+        new_item_obj['generated_by'] = generated_by
+
+        item_list.append(new_item_obj)
+
+        props_in_ref = ('type', 'identifier', 'version', 'long_name')
+        return dict([(prop, new_item_obj[prop]) for prop in props_in_ref])
+
+    def _process_index_json(self, index_obj: dict):
+        """
+        Process 'index_obj' as contents of source package's index.json and store
+        in memory this source package's zipfile as well as package's individual
+        files and computed definitions of the source package and items defined
+        in it.
+        """
+        index_validator.validate(index_obj)
+
+        schema = f'{schemas_root}/api_source_description-1.schema.json'
+
+        self.source_name = index_obj['source_name']
+
+        generate_spdx = index_obj.get('reuse_generate_spdx_report', False)
+        if generate_spdx:
+            contents  = generate_spdx_report(self.srcdir)
+            spdx_path = (self.srcdir / 'report.spdx').resolve()
+            spdx_ref  = FileRef(spdx_path, contents)
+
+            spdx_ref.include_in_zipfile = False
+            self.files_by_path[spdx_path] = spdx_ref
+
+        self.copyright_file_refs = \
+            [self._process_file(f['file']) for f in index_obj['copyright']]
+
+        if generate_spdx and not spdx_ref.include_in_distribution:
+            raise FileReferenceError(_('report_spdx_not_in_copyright_list'))
+
+        item_refs = [self._process_item(d) for d in index_obj['definitions']]
+
+        for file_ref in index_obj.get('additional_files', []):
+            self._process_file(file_ref['file'], include_in_distribution=False)
+
+        root_dir_path = Path(self.source_name)
+
+        source_archives_obj = {
+            'zip' : {
+                'sha256': self._prepare_source_package_zip(root_dir_path)
+            }
+        }
+
+        self.source_description = {
+            '$schema':            schema,
+            'source_name':        self.source_name,
+            'source_copyright':   self.copyright_file_refs,
+            'upstream_url':       index_obj['upstream_url'],
+            'definitions':        item_refs,
+            'source_archives':    source_archives_obj,
+            'generated_by':       generated_by
+        }
+
+        if 'comment' in index_obj:
+            self.source_description['comment'] = index_obj['comment']
+
+    def write_source_package_zip(self, dstpath: Path):
+        """
+        Create a .zip archive containing files needed to build this source
+        package and write it at 'dstpath'.
+        """
+        with open(dstpath, 'wb') as output:
+            output.write(self.source_zip_contents)
+
+    def write_package_files(self, dstpath: Path):
+        """Write package files under 'dstpath' for distribution."""
+        file_dir_path = (dstpath / 'file' / 'sha256').resolve()
+        file_dir_path.mkdir(parents=True, exist_ok=True)
+
+        for file_ref in self.files_by_path.values():
+            if file_ref.include_in_distribution:
+                file_path = file_dir_path / file_ref.contents_hash
+                file_path.write_bytes(file_ref.contents)
+
+        source_dir_path = (dstpath / 'source').resolve()
+        source_dir_path.mkdir(parents=True, exist_ok=True)
+        source_name = self.source_description["source_name"]
+
+        with open(source_dir_path / f'{source_name}.json', 'wt') as output:
+            json.dump(self.source_description, output)
+
+        with open(source_dir_path / f'{source_name}.zip', 'wb') as output:
+            output.write(self.source_zip_contents)
+
+        for item_type, item_list in [
+                ('resource', self.resource_list),
+                ('mapping', self.mapping_list)
+        ]:
+            item_type_dir_path = (dstpath / item_type).resolve()
+
+            for item_def in item_list:
+                item_dir_path = item_type_dir_path / item_def['identifier']
+                item_dir_path.mkdir(parents=True, exist_ok=True)
+
+                version = '.'.join([str(n) for n in item_def['version']])
+                with open(item_dir_path / version, 'wt') as output:
+                    json.dump(item_def, output)
+
+dir_type = click.Path(exists=True, file_okay=False, resolve_path=True)
+
+@click.option('-s', '--srcdir', default='./', type=dir_type, show_default=True,
+              help=_('source_directory_to_build_from'))
+@click.option('-i', '--index-json', default='index.json', type=click.Path(),
+              help=_('path_instead_of_index_json'))
+@click.option('-d', '--dstdir', type=dir_type, required=True,
+              help=_('built_package_files_destination'))
+@click.version_option(version=_version.version, prog_name='Hydrilla builder',
+                      message=_('%(prog)s_%(version)s_license'),
+                      help=_('version_printing'))
+def perform(srcdir, index_json, dstdir):
+    """<this will be replaced by a localized docstring for Click to pick up>"""
+    build = Build(Path(srcdir), Path(index_json))
+    build.write_package_files(Path(dstdir))
+
+perform.__doc__ = _('build_package_from_srcdir_to_dstdir')
+
+perform = click.command()(perform)
diff --git a/src/hydrilla/builder/locales/en_US/LC_MESSAGES/hydrilla-messages.po b/src/hydrilla/builder/locales/en_US/LC_MESSAGES/hydrilla-messages.po
new file mode 100644
index 0000000..e3ab525
--- /dev/null
+++ b/src/hydrilla/builder/locales/en_US/LC_MESSAGES/hydrilla-messages.po
@@ -0,0 +1,83 @@
+# SPDX-License-Identifier: CC0-1.0
+#
+# English (United States) translations for hydrilla.builder.
+# Copyright (C) 2022 Wojtek Kosior <koszko@koszko.org>
+# Available under the terms of Creative Commons Zero v1.0 Universal.
+msgid ""
+msgstr ""
+"Project-Id-Version: hydrilla.builder 0.1.dev16+g4e46d7f.d20220211\n"
+"Report-Msgid-Bugs-To: koszko@koszko.org\n"
+"POT-Creation-Date: 2022-04-19 13:51+0200\n"
+"PO-Revision-Date: 2022-02-12 00:00+0000\n"
+"Last-Translator: Wojtek Kosior <koszko@koszko.org>\n"
+"Language: en_US\n"
+"Language-Team: en_US <koszko@koszko.org>\n"
+"Plural-Forms: nplurals=2; plural=(n != 1)\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=utf-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+"Generated-By: Babel 2.8.0\n"
+
+#: src/hydrilla/builder/build.py:118
+msgid "couldnt_import_reuse_is_it_installed"
+msgstr ""
+"Could not import 'reuse'. Is the tool installed and visible to this "
+"Python instance?"
+
+#: src/hydrilla/builder/build.py:123
+msgid "spdx_report_from_reuse_incompliant"
+msgstr "Attempt to generate an SPDX report for a REUSE-incompliant package."
+
+#: src/hydrilla/builder/build.py:207
+msgid "loading_{}_outside_package_dir"
+msgstr "Attempt to load '{}' which lies outside package source directory."
+
+#: src/hydrilla/builder/build.py:211
+msgid "loading_reserved_index_json"
+msgstr "Attempt to load 'index.json' which is a reserved filename."
+
+#: src/hydrilla/builder/build.py:329
+msgid "report_spdx_not_in_copyright_list"
+msgstr ""
+"Told to generate 'report.spdx' but 'report.spdx' is not listed among "
+"copyright files. Refusing to proceed."
+
+#: src/hydrilla/builder/build.py:402
+msgid "source_directory_to_build_from"
+msgstr "Source directory to build from."
+
+#: src/hydrilla/builder/build.py:404
+msgid "path_instead_of_index_json"
+msgstr ""
+"Path to file to be processed instead of index.json (if not absolute, "
+"resolved relative to srcdir)."
+
+#: src/hydrilla/builder/build.py:406
+msgid "built_package_files_destination"
+msgstr "Destination directory to write built package files to."
+
+#: src/hydrilla/builder/build.py:408
+#, python-format
+msgid "%(prog)s_%(version)s_license"
+msgstr ""
+"%(prog)s %(version)s\n"
+"Copyright (C) 2021,2022 Wojtek Kosior and contributors.\n"
+"License GPLv3+: GNU AGPL version 3 or later "
+"<https://gnu.org/licenses/gpl.html>\n"
+"This is free software: you are free to change and redistribute it.\n"
+"There is NO WARRANTY, to the extent permitted by law."
+
+#: src/hydrilla/builder/build.py:409
+msgid "version_printing"
+msgstr "Print version information and exit."
+
+#: src/hydrilla/builder/build.py:415
+msgid "build_package_from_srcdir_to_dstdir"
+msgstr ""
+"Build Hydrilla package from `scrdir` and write the resulting files under "
+"`dstdir`."
+
+#: src/hydrilla/util/_util.py:79
+msgid "bad_comment"
+msgstr "bad comment"
+
diff --git a/src/hydrilla/schemas/api_mapping_description-1.0.1.schema.json b/src/hydrilla/schemas/api_mapping_description-1.0.1.schema.json
new file mode 100644
index 0000000..880a5c4
--- /dev/null
+++ b/src/hydrilla/schemas/api_mapping_description-1.0.1.schema.json
@@ -0,0 +1,21 @@
+{
+    "$schema": "http://json-schema.org/draft-07/schema#",
+    "$id": "https://hydrilla.koszko.org/schemas/api_mapping_description-1.0.1.schema.json",
+    "title": "Mapping description",
+    "description": "Definition of a Hydrilla mapping, as served through HTTP API",
+    "allOf": [{
+	"$ref": "./common_definitions-1.0.1.schema.json#/definitions/mapping_definition_base"
+    }, {
+	"$ref": "./common_definitions-1.0.1.schema.json#/definitions/item_definition"
+    }, {
+	"type": "object",
+	"required": ["$schema"],
+	"properties": {
+	    "$schema": {
+		"description": "Mark this instance as conforming to mapping description schema 1.x",
+		"type": "string",
+		"pattern": "^https://hydrilla\\.koszko\\.org/schemas/api_mapping_description-1\\.(([1-9][0-9]*|0)\\.)*schema\\.json$"
+	    }
+	}
+    }]
+}
diff --git a/src/hydrilla/schemas/api_mapping_description-1.0.1.schema.json.license b/src/hydrilla/schemas/api_mapping_description-1.0.1.schema.json.license
new file mode 100644
index 0000000..f41d511
--- /dev/null
+++ b/src/hydrilla/schemas/api_mapping_description-1.0.1.schema.json.license
@@ -0,0 +1,5 @@
+SPDX-License-Identifier: CC0-1.0
+
+Copyright (C) 2022 Wojtek Kosior <koszko@koszko.org>
+
+Available under the terms of Creative Commons Zero v1.0 Universal.
diff --git a/src/hydrilla/schemas/api_query_result-1.0.1.schema.json b/src/hydrilla/schemas/api_query_result-1.0.1.schema.json
new file mode 100644
index 0000000..89c5428
--- /dev/null
+++ b/src/hydrilla/schemas/api_query_result-1.0.1.schema.json
@@ -0,0 +1,25 @@
+{
+    "$schema": "http://json-schema.org/draft-07/schema#",
+    "$id": "https://hydrilla.koszko.org/schemas/api_query_result-1.0.1.schema.json",
+    "title": "Query result",
+    "description": "Object with a list of references to mappings that contain payloads for requested URL",
+    "type": "object",
+    "required": ["$schema", "mappings"],
+    "properties": {
+	"$schema": {
+	    "description": "Mark this instance as conforming to query result schema 1.x",
+	    "type": "string",
+	    "pattern": "^https://hydrilla\\.koszko\\.org/schemas/api_query_result-1\\.(([1-9][0-9]*|0)\\.)*schema\\.json$"
+	},
+	"mappings": {
+	    "description": "References to mappings using at least one pattern that matches the requested URL",
+	    "type": "array",
+	    "items": {
+		"$ref": "./common_definitions-1.0.1.schema.json#/definitions/item_ref"
+	    }
+	},
+	"generated_by": {
+	    "$ref": "./common_definitions-1.0.1.schema.json#/definitions/generated_by"
+	}
+    }
+}
diff --git a/src/hydrilla/schemas/api_query_result-1.0.1.schema.json.license b/src/hydrilla/schemas/api_query_result-1.0.1.schema.json.license
new file mode 100644
index 0000000..f41d511
--- /dev/null
+++ b/src/hydrilla/schemas/api_query_result-1.0.1.schema.json.license
@@ -0,0 +1,5 @@
+SPDX-License-Identifier: CC0-1.0
+
+Copyright (C) 2022 Wojtek Kosior <koszko@koszko.org>
+
+Available under the terms of Creative Commons Zero v1.0 Universal.
diff --git a/src/hydrilla/schemas/api_resource_description-1.0.1.schema.json b/src/hydrilla/schemas/api_resource_description-1.0.1.schema.json
new file mode 100644
index 0000000..7459394
--- /dev/null
+++ b/src/hydrilla/schemas/api_resource_description-1.0.1.schema.json
@@ -0,0 +1,26 @@
+{
+    "$schema": "http://json-schema.org/draft-07/schema#",
+    "$id": "https://hydrilla.koszko.org/schemas/api_resource_description-1.0.1.schema.json",
+    "title": "Resource description",
+    "description": "Definition of a Hydrilla resource, as served through HTTP API",
+    "allOf": [{
+	"$ref": "./common_definitions-1.0.1.schema.json#/definitions/resource_definition_base"
+    }, {
+	"$ref": "./common_definitions-1.0.1.schema.json#/definitions/item_definition"
+    }, {
+	"type": "object",
+	"required": ["$schema"],
+	"properties": {
+	    "$schema": {
+		"description": "Mark this instance as conforming to resource description schema 1.x",
+		"type": "string",
+		"pattern": "^https://hydrilla\\.koszko\\.org/schemas/api_resource_description-1\\.(([1-9][0-9]*|0)\\.)*schema\\.json$"
+	    },
+	    "scripts": {
+		"description": "Which files are resource's scripts and need to be installed",
+		"$ref": "./common_definitions-1.0.1.schema.json#/definitions/file_ref_list_sha256",
+		"default": []
+	    }
+	}
+    }]
+}
diff --git a/src/hydrilla/schemas/api_resource_description-1.0.1.schema.json.license b/src/hydrilla/schemas/api_resource_description-1.0.1.schema.json.license
new file mode 100644
index 0000000..f41d511
--- /dev/null
+++ b/src/hydrilla/schemas/api_resource_description-1.0.1.schema.json.license
@@ -0,0 +1,5 @@
+SPDX-License-Identifier: CC0-1.0
+
+Copyright (C) 2022 Wojtek Kosior <koszko@koszko.org>
+
+Available under the terms of Creative Commons Zero v1.0 Universal.
diff --git a/src/hydrilla/schemas/api_source_description-1.0.1.schema.json b/src/hydrilla/schemas/api_source_description-1.0.1.schema.json
new file mode 100644
index 0000000..0744d1a
--- /dev/null
+++ b/src/hydrilla/schemas/api_source_description-1.0.1.schema.json
@@ -0,0 +1,66 @@
+{
+    "$schema": "http://json-schema.org/draft-07/schema#",
+    "$id": "https://hydrilla.koszko.org/schemas/api_source_description-1.0.1.schema.json",
+    "title": "Source description",
+    "description": "Built description of a Hydrilla source package",
+    "type": "object",
+    "required": [
+	"$schema",
+	"source_name",
+	"source_copyright",
+	"source_archives",
+	"upstream_url",
+	"definitions"
+    ],
+    "properties": {
+	"$schema": {
+	    "description": "Mark this instance as conforming to source description schema 1.x",
+	    "type": "string",
+	    "pattern": "^https://hydrilla\\.koszko\\.org/schemas/api_source_description-1\\.(([1-9][0-9]*|0)\\.)*schema\\.json$"
+	},
+	"source_name": {
+	    "$ref": "./common_definitions-1.0.1.schema.json#/definitions/source_name"
+	},
+	"source_copyright":  {
+	    "description": "Which files indicate license terms of the source package",
+	    "$ref": "./common_definitions-1.0.1.schema.json#/definitions/file_ref_list_sha256"
+	},
+	"source_archives": {
+	    "description": "What archive extensions are available for this package's sources",
+	    "type": "object",
+	    "required": ["zip"],
+	    "additionalProperties": {
+		"description": "What is the SHA256 sum of given source archive",
+		"type": "object",
+		"required": ["sha256"],
+		"properties": {
+		    "sha256": {
+			"$ref": "./common_definitions-1.0.1.schema.json#/definitions/sha256"
+		    }
+		}
+	    },
+	    "examples": [{
+		"zip": {
+		    "sha256": "688461da362ffe2fc8e85db73e709a5356d41c8aeb7d1eee7170c64ee21dd2a2"
+		}
+	    }]
+	},
+	"upstream_url": {
+	    "description": "Where this software/work initially comes from",
+	    "type": "string"
+	},
+	"comment": {
+	    "$ref": "./common_definitions-1.0.1.schema.json#/definitions/comment"
+	},
+	"definitions": {
+	    "description": "References to site resources and pattern->payload mappings",
+	    "type": "array",
+	    "items": {
+		"$ref": "./common_definitions-1.0.1.schema.json#/definitions/typed_item_ref"
+	    }
+	},
+	"generated_by": {
+	    "$ref": "./common_definitions-1.0.1.schema.json#/definitions/generated_by"
+	}
+    }
+}
diff --git a/src/hydrilla/schemas/api_source_description-1.0.1.schema.json.license b/src/hydrilla/schemas/api_source_description-1.0.1.schema.json.license
new file mode 100644
index 0000000..f41d511
--- /dev/null
+++ b/src/hydrilla/schemas/api_source_description-1.0.1.schema.json.license
@@ -0,0 +1,5 @@
+SPDX-License-Identifier: CC0-1.0
+
+Copyright (C) 2022 Wojtek Kosior <koszko@koszko.org>
+
+Available under the terms of Creative Commons Zero v1.0 Universal.
diff --git a/src/hydrilla/schemas/common_definitions-1.0.1.schema.json b/src/hydrilla/schemas/common_definitions-1.0.1.schema.json
new file mode 100644
index 0000000..b803188
--- /dev/null
+++ b/src/hydrilla/schemas/common_definitions-1.0.1.schema.json
@@ -0,0 +1,233 @@
+{
+    "$schema": "http://json-schema.org/draft-07/schema#",
+    "$id": "https://hydrilla.koszko.org/schemas/common_definitions-1.0.1.schema.json",
+    "title": "Common definitions",
+    "description": "Definitions used by other Hydrilla schemas",
+    "definitions": {
+	"version": {
+	    "description": "Version expressed as an array of integers",
+	    "type": "array",
+	    "minItems": 1,
+	    "items": {
+		"type": "integer",
+		"minimum": 0
+	    },
+	    "contains": {
+		"type": "integer",
+		"minimum": 1
+	    },
+	    "minItems": 1
+	},
+	"source_name": {
+	    "description": "Unique identifier of this source package",
+	    "type": "string",
+	    "pattern": "^[-0-9a-z.]+$"
+	},
+	"comment": {
+	    "description": "An optional comment",
+	    "type": "string"
+	},
+        "file_ref_list": {
+	    "description": "List of simple file references",
+	    "type": "array",
+	    "items": {
+		"type": "object",
+		"required": ["file"],
+		"properties": {
+		    "file": {
+			"description": "Filename relative to source package main directory; separator is '/'",
+			"type": "string",
+			"pattern": "^[^/]"
+		    }
+		}
+	    }
+        },
+	"sha256": {
+	    "description": "An SHA256 sum, in hexadecimal",
+	    "type": "string",
+	    "pattern": "^[0-9a-f]{64}$"
+	},
+        "file_ref_list_sha256": {
+	    "description": "List of file references with files' SHA256 sums included",
+	    "allOf": [{
+		"$ref": "#/definitions/file_ref_list"
+	    }, {
+		"type": "array",
+		"items": {
+		    "type": "object",
+		    "required": ["sha256"],
+		    "properties": {
+			"sha256": {
+			    "$ref": "#/definitions/sha256"
+			}
+		    }
+		}
+	    }]
+        },
+	"item_identifier": {
+	    "description": "Identifier of an item (shared with other versions of the item, otherwise unique)",
+	    "type": "string",
+	    "pattern": "^[-0-9a-z]+$"
+	},
+	"item_dep_specifier": {
+	    "description": "Simple reference to an item as a dependency",
+	    "type": "object",
+	    "required": ["identifier"],
+	    "properties": {
+		"identifier": {
+		    "$ref": "#/definitions/item_identifier"
+		}
+	    }
+	},
+	"item_ref": {
+	    "description": "An object containing a subset of fields from full item definition",
+	    "type": "object",
+	    "required": ["identifier", "long_name", "version"],
+	    "properties": {
+		"identifier": {
+		    "$ref": "#/definitions/item_identifier"
+		},
+		"long_name": {
+		    "description": "User-friendly alternative to the identifier",
+		    "type": "string"
+		},
+		"version": {
+		    "$ref": "#/definitions/version"
+		}
+	    }
+	},
+	"typed_item_ref": {
+	    "description": "An object containing a subset of fields from full item definition, including type",
+	    "allOf": [{
+		"$ref": "#/definitions/item_ref"
+	    }, {
+		"type": "object",
+		"required": ["type"],
+		"properties": {
+		    "type": {
+			"description": "What kind of item is it (resource or mapping)",
+			"enum": ["resource", "mapping"]
+		    }
+		}
+	    }]
+	},
+	"item_definition_base": {
+	    "description": "Definition of a resource/mapping (fields common to source definitions and built definitions)",
+	    "allOf": [{
+		"$ref": "#/definitions/typed_item_ref"
+	    }, {
+		"type": "object",
+		"required": ["description"],
+		"properties": {
+		    "uuid": {
+			"description": "UUIDv4 of this item (shared with other versions of this item, otherwise unique)",
+			"type": "string",
+			"pattern": "^[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$"
+		    },
+		    "description": {
+			"description": "Item's description",
+			"type": "string"
+		    },
+		    "comment": {
+			"$ref": "#/definitions/comment"
+		    }
+		}
+	    }]
+	},
+	"resource_definition_base": {
+	    "description": "Definition of a resource (fields common to source definitions and built definitions)",
+	    "allOf": [{
+		"$ref": "#/definitions/item_definition_base"
+	    }, {
+		"type": "object",
+		"required": ["type", "revision"],
+		"properties": {
+		    "type": {
+			"description": "Identify this item as a resource",
+			"const": "resource"
+		    },
+		    "revision": {
+			"description": "Which revision of a packaging of given version of an upstream resource is this",
+			"type": "integer",
+			"minimum": 1
+		    },
+		    "scripts": {
+			"description": "What scripts are included in the resource",
+			"$ref": "#/definitions/file_ref_list",
+			"default": []
+		    },
+		    "dependencies": {
+			"description": "Which other resources this resource depends on",
+			"type": "array",
+			"items": {
+			    "$ref": "#/definitions/item_dep_specifier"
+			},
+			"default": []
+		    }
+		}
+	    }]
+	},
+	"mapping_definition_base": {
+	    "description": "Definition of a mapping (fields common to source definitions and built definitions)",
+	    "allOf": [{
+		"$ref": "#/definitions/item_definition_base"
+	    }, {
+		"type": "object",
+		"required": ["type"],
+		"properties": {
+		    "type": {
+			"description": "Identify this item as a mapping",
+			"const": "mapping"
+		    },
+		    "payloads": {
+			"description": "Which payloads are to be applied to which URLs",
+			"additionalProperties": {
+			    "$ref": "#/definitions/item_dep_specifier"
+			},
+			"default": {},
+			"examples": [{
+			    "https://hydrillabugs.koszko.org/***": {
+				"identifier": "helloapple"
+			    },
+			    "https://*.koszko.org/***": {
+				"identifier": "hello-potato"
+			    }
+			}]
+		    }
+		}
+	    }]
+	},
+	"generated_by": {
+	    "description": "Describe what software generated this instance",
+	    "type": "object",
+	    "required": ["name"],
+	    "properties": {
+		"name": {
+		    "type": "string",
+		    "description": "Instance generator software name, without version"
+		},
+		"version": {
+		    "type": "string",
+		    "description": "Instance generator software version, in arbitrary format"
+		}
+	    }
+	},
+	"item_definition": {
+	    "description": "Definition of a resource/mapping (fields specific to built definitions)",
+	    "type": "object",
+	    "required": ["source_name", "source_copyright"],
+	    "properties": {
+		"source_name": {
+		    "$ref": "#/definitions/source_name"
+		},
+		"source_copyright": {
+		    "description": "Which files indicate license terms of the source package and should be installed",
+		    "$ref": "#/definitions/file_ref_list_sha256"
+		},
+		"generated_by": {
+		    "$ref": "#/definitions/generated_by"
+		}
+	    }
+	}
+    }
+}
diff --git a/src/hydrilla/schemas/common_definitions-1.0.1.schema.json.license b/src/hydrilla/schemas/common_definitions-1.0.1.schema.json.license
new file mode 100644
index 0000000..f41d511
--- /dev/null
+++ b/src/hydrilla/schemas/common_definitions-1.0.1.schema.json.license
@@ -0,0 +1,5 @@
+SPDX-License-Identifier: CC0-1.0
+
+Copyright (C) 2022 Wojtek Kosior <koszko@koszko.org>
+
+Available under the terms of Creative Commons Zero v1.0 Universal.
diff --git a/src/hydrilla/schemas/package_source-1.0.1.schema.json b/src/hydrilla/schemas/package_source-1.0.1.schema.json
new file mode 100644
index 0000000..2f9482e
--- /dev/null
+++ b/src/hydrilla/schemas/package_source-1.0.1.schema.json
@@ -0,0 +1,56 @@
+{
+    "$schema": "http://json-schema.org/draft-07/schema#",
+    "$id": "https://hydrilla.koszko.org/schemas/package_source-1.0.1.schema.json",
+    "title": "Package source",
+    "description": "Definition of a Hydrilla source package",
+    "type": "object",
+    "required": [
+	"$schema",
+	"source_name",
+	"copyright",
+	"upstream_url",
+	"definitions"
+    ],
+    "properties": {
+	"$schema": {
+	    "description": "Mark this instance as conforming to package source schema 1.x",
+	    "type": "string",
+	    "pattern": "^https://hydrilla\\.koszko\\.org/schemas/package_source-1\\.(([1-9][0-9]*|0)\\.)*schema\\.json$"
+	},
+	"source_name": {
+	    "$ref": "./common_definitions-1.0.1.schema.json#/definitions/source_name"
+	},
+	"copyright":  {
+	    "description": "Which files from the source package indicate its license terms and should be included in the distribution packages",
+	    "$ref": "./common_definitions-1.0.1.schema.json#/definitions/file_ref_list"
+	},
+	"upstream_url": {
+	    "description": "Where this software/work initially comes from",
+	    "type": "string"
+	},
+	"comment": {
+	    "$ref": "./common_definitions-1.0.1.schema.json#/definitions/comment"
+	},
+	"definitions": {
+	    "description": "Definitions of site resources and pattern->payload mappings",
+	    "type": "array",
+	    "items": {
+		"anyOf": [{
+		    "$ref": "./common_definitions-1.0.1.schema.json#/definitions/resource_definition_base"
+		}, {
+		    "$ref": "./common_definitions-1.0.1.schema.json#/definitions/mapping_definition_base"
+		}]
+	    }
+	},
+	"additional_files": {
+	    "description": "Files which should be included in the source archive produced by Hydrilla builder in addition to script and copyright files",
+	    "$ref": "./common_definitions-1.0.1.schema.json#/definitions/file_ref_list",
+	    "default": []
+	},
+	"reuse_generate_spdx_report": {
+	    "description": "Should report.spdx be automatically generated for the package using REUSE tool",
+	    "type": "boolean",
+	    "default": false
+	}
+    }
+}
diff --git a/src/hydrilla/schemas/package_source-1.0.1.schema.json.license b/src/hydrilla/schemas/package_source-1.0.1.schema.json.license
new file mode 100644
index 0000000..f41d511
--- /dev/null
+++ b/src/hydrilla/schemas/package_source-1.0.1.schema.json.license
@@ -0,0 +1,5 @@
+SPDX-License-Identifier: CC0-1.0
+
+Copyright (C) 2022 Wojtek Kosior <koszko@koszko.org>
+
+Available under the terms of Creative Commons Zero v1.0 Universal.
diff --git a/src/hydrilla/util/__init__.py b/src/hydrilla/util/__init__.py
new file mode 100644
index 0000000..fadb81c
--- /dev/null
+++ b/src/hydrilla/util/__init__.py
@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: CC0-1.0
+
+# Copyright (C) 2022 Wojtek Kosior <koszko@koszko.org>
+#
+# Available under the terms of Creative Commons Zero v1.0 Universal.
+
+from ._util import strip_json_comments, normalize_version, parse_version, \
+    version_string, validator_for, translation
diff --git a/src/hydrilla/util/_util.py b/src/hydrilla/util/_util.py
new file mode 100644
index 0000000..778e78f
--- /dev/null
+++ b/src/hydrilla/util/_util.py
@@ -0,0 +1,162 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+# Building Hydrilla packages.
+#
+# This file is part of Hydrilla
+#
+# Copyright (C) 2021, 2022 Wojtek Kosior
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as
+# published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+#
+#
+# I, Wojtek Kosior, thereby promise not to sue for violation of this
+# file's license. Although I request that you do not make use this code
+# in a proprietary program, I am not going to enforce this in court.
+
+# Enable using with Python 3.7.
+from __future__ import annotations
+
+import re
+import json
+import locale
+import gettext
+
+from pathlib import Path
+from typing import Optional, Union
+
+from jsonschema import RefResolver, Draft7Validator
+
+here = Path(__file__).resolve().parent
+
+_strip_comment_re = re.compile(r'''
+^ # match from the beginning of each line
+( # catch the part before '//' comment
+  (?: # this group matches either a string or a single out-of-string character
+    [^"/] |
+    "
+    (?: # this group matches any in-a-string character
+      [^"\\] |          # match any normal character
+      \\[^u] |          # match any escaped character like '\f' or '\n'
+      \\u[a-fA-F0-9]{4} # match an escape
+    )*
+    "
+  )*
+)
+# expect either end-of-line or a comment:
+# * unterminated strings will cause matching to fail
+# * bad comment (with '/' instead of '//') will be indicated by second group
+#   having length 1 instead of 2 or 0
+(//?|$)
+''', re.VERBOSE)
+
+def strip_json_comments(text: str) -> str:
+    """
+    Accept JSON text with optional C++-style ('//') comments and return the text
+    with comments removed. Consecutive slashes inside strings are handled
+    properly. A spurious single slash ('/') shall generate an error. Errors in
+    JSON itself shall be ignored.
+    """
+    processed = 0
+    stripped_text = []
+    for line in text.split('\n'):
+        match = _strip_comment_re.match(line)
+
+        if match is None: # unterminated string
+            # ignore this error, let json module report it
+            stripped = line
+        elif len(match[2]) == 1:
+            raise json.JSONDecodeError(_('bad_comment'), text,
+                                       processed + len(match[1]))
+        else:
+            stripped = match[1]
+
+        stripped_text.append(stripped)
+        processed += len(line) + 1
+
+    return '\n'.join(stripped_text)
+
+def normalize_version(ver: list[int]) -> list[int]:
+    """Strip right-most zeroes from 'ver'. The original list is not modified."""
+    new_len = 0
+    for i, num in enumerate(ver):
+        if num != 0:
+            new_len = i + 1
+
+    return ver[:new_len]
+
+def parse_version(ver_str: str) -> list[int]:
+    """
+    Convert 'ver_str' into an array representation, e.g. for ver_str="4.6.13.0"
+    return [4, 6, 13, 0].
+    """
+    return [int(num) for num in ver_str.split('.')]
+
+def version_string(ver: list[int], rev: Optional[int]=None) -> str:
+    """
+    Produce version's string representation (optionally with revision), like:
+        1.2.3-5
+    No version normalization is performed.
+    """
+    return '.'.join([str(n) for n in ver]) + ('' if rev is None else f'-{rev}')
+
+schemas = {}
+for path in (here.parent / 'schemas').glob('*-1.0.1.schema.json'):
+    schema = json.loads(path.read_text())
+    schemas[schema['$id']] = schema
+
+common_schema_filename = 'common_definitions-1.schema.json'
+common_schema_path = here.parent / "schemas" / common_schema_filename
+
+resolver = RefResolver(
+    base_uri=f'file://{str(common_schema_path)}',
+    referrer=f'https://hydrilla.koszko.org/{common_schema_filename}',
+    store=schemas
+)
+
+def validator_for(schema_filename: str) -> Draft7Validator:
+    """
+    Prepare a validator for one of the schemas in '../schemas'.
+
+    This function is not thread-safe.
+    """
+    return Draft7Validator(resolver.resolve(schema_filename)[1],
+                           resolver=resolver)
+
+def translation(localedir: Union[Path, str], lang: Optional[str]=None) \
+    -> gettext.GNUTranslations:
+    """
+    Configure translations for domain 'hydrilla-messages' and return the object
+    that represents them.
+
+    If `lang` is set, look for translations for `lang`. Otherwise, try to
+    determine system's default language and use that.
+    """
+    # https://stackoverflow.com/questions/3425294/how-to-detect-the-os-default-language-in-python
+    # But I am not going to surrender to Microbugs' nonfree, crappy OS to test
+    # it, to the lines inside try: may fail.
+    if lang is None:
+        try:
+            from ctypes.windll import kernel32 as windll
+            lang = locale.windows_locale[windll.GetUserDefaultUILanguage()]
+        except:
+            lang = locale.getdefaultlocale()[0] or 'en_US'
+
+    localedir = Path(localedir)
+    if not (localedir / lang).is_dir():
+        lang = 'en_US'
+
+    return gettext.translation('hydrilla-messages', localedir=localedir,
+                               languages=[lang])
+
+_ = translation(here.parent / 'builder' / 'locales').gettext
diff --git a/tests/source-package-example/.reuse/dep5 b/tests/source-package-example/.reuse/dep5
new file mode 100644
index 0000000..9091060
--- /dev/null
+++ b/tests/source-package-example/.reuse/dep5
@@ -0,0 +1,10 @@
+Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
+Upstream-Name: Hydrilla source package example
+Upstream-Contact: Wojtek Kosior <koszko@koszko.org>
+Source: https://git.koszko.org/hydrilla-source-package-example
+
+# Sample paragraph, commented out:
+#
+# Files: src/*
+# Copyright: $YEAR $NAME <$CONTACT>
+# License: ...
diff --git a/tests/source-package-example/LICENSES/CC0-1.0.txt b/tests/source-package-example/LICENSES/CC0-1.0.txt
new file mode 100644
index 0000000..0e259d4
--- /dev/null
+++ b/tests/source-package-example/LICENSES/CC0-1.0.txt
@@ -0,0 +1,121 @@
+Creative Commons Legal Code
+
+CC0 1.0 Universal
+
+    CREATIVE COMMONS CORPORATION IS NOT A LAW FIRM AND DOES NOT PROVIDE
+    LEGAL SERVICES. DISTRIBUTION OF THIS DOCUMENT DOES NOT CREATE AN
+    ATTORNEY-CLIENT RELATIONSHIP. CREATIVE COMMONS PROVIDES THIS
+    INFORMATION ON AN "AS-IS" BASIS. CREATIVE COMMONS MAKES NO WARRANTIES
+    REGARDING THE USE OF THIS DOCUMENT OR THE INFORMATION OR WORKS
+    PROVIDED HEREUNDER, AND DISCLAIMS LIABILITY FOR DAMAGES RESULTING FROM
+    THE USE OF THIS DOCUMENT OR THE INFORMATION OR WORKS PROVIDED
+    HEREUNDER.
+
+Statement of Purpose
+
+The laws of most jurisdictions throughout the world automatically confer
+exclusive Copyright and Related Rights (defined below) upon the creator
+and subsequent owner(s) (each and all, an "owner") of an original work of
+authorship and/or a database (each, a "Work").
+
+Certain owners wish to permanently relinquish those rights to a Work for
+the purpose of contributing to a commons of creative, cultural and
+scientific works ("Commons") that the public can reliably and without fear
+of later claims of infringement build upon, modify, incorporate in other
+works, reuse and redistribute as freely as possible in any form whatsoever
+and for any purposes, including without limitation commercial purposes.
+These owners may contribute to the Commons to promote the ideal of a free
+culture and the further production of creative, cultural and scientific
+works, or to gain reputation or greater distribution for their Work in
+part through the use and efforts of others.
+
+For these and/or other purposes and motivations, and without any
+expectation of additional consideration or compensation, the person
+associating CC0 with a Work (the "Affirmer"), to the extent that he or she
+is an owner of Copyright and Related Rights in the Work, voluntarily
+elects to apply CC0 to the Work and publicly distribute the Work under its
+terms, with knowledge of his or her Copyright and Related Rights in the
+Work and the meaning and intended legal effect of CC0 on those rights.
+
+1. Copyright and Related Rights. A Work made available under CC0 may be
+protected by copyright and related or neighboring rights ("Copyright and
+Related Rights"). Copyright and Related Rights include, but are not
+limited to, the following:
+
+  i. the right to reproduce, adapt, distribute, perform, display,
+     communicate, and translate a Work;
+ ii. moral rights retained by the original author(s) and/or performer(s);
+iii. publicity and privacy rights pertaining to a person's image or
+     likeness depicted in a Work;
+ iv. rights protecting against unfair competition in regards to a Work,
+     subject to the limitations in paragraph 4(a), below;
+  v. rights protecting the extraction, dissemination, use and reuse of data
+     in a Work;
+ vi. database rights (such as those arising under Directive 96/9/EC of the
+     European Parliament and of the Council of 11 March 1996 on the legal
+     protection of databases, and under any national implementation
+     thereof, including any amended or successor version of such
+     directive); and
+vii. other similar, equivalent or corresponding rights throughout the
+     world based on applicable law or treaty, and any national
+     implementations thereof.
+
+2. Waiver. To the greatest extent permitted by, but not in contravention
+of, applicable law, Affirmer hereby overtly, fully, permanently,
+irrevocably and unconditionally waives, abandons, and surrenders all of
+Affirmer's Copyright and Related Rights and associated claims and causes
+of action, whether now known or unknown (including existing as well as
+future claims and causes of action), in the Work (i) in all territories
+worldwide, (ii) for the maximum duration provided by applicable law or
+treaty (including future time extensions), (iii) in any current or future
+medium and for any number of copies, and (iv) for any purpose whatsoever,
+including without limitation commercial, advertising or promotional
+purposes (the "Waiver"). Affirmer makes the Waiver for the benefit of each
+member of the public at large and to the detriment of Affirmer's heirs and
+successors, fully intending that such Waiver shall not be subject to
+revocation, rescission, cancellation, termination, or any other legal or
+equitable action to disrupt the quiet enjoyment of the Work by the public
+as contemplated by Affirmer's express Statement of Purpose.
+
+3. Public License Fallback. Should any part of the Waiver for any reason
+be judged legally invalid or ineffective under applicable law, then the
+Waiver shall be preserved to the maximum extent permitted taking into
+account Affirmer's express Statement of Purpose. In addition, to the
+extent the Waiver is so judged Affirmer hereby grants to each affected
+person a royalty-free, non transferable, non sublicensable, non exclusive,
+irrevocable and unconditional license to exercise Affirmer's Copyright and
+Related Rights in the Work (i) in all territories worldwide, (ii) for the
+maximum duration provided by applicable law or treaty (including future
+time extensions), (iii) in any current or future medium and for any number
+of copies, and (iv) for any purpose whatsoever, including without
+limitation commercial, advertising or promotional purposes (the
+"License"). The License shall be deemed effective as of the date CC0 was
+applied by Affirmer to the Work. Should any part of the License for any
+reason be judged legally invalid or ineffective under applicable law, such
+partial invalidity or ineffectiveness shall not invalidate the remainder
+of the License, and in such case Affirmer hereby affirms that he or she
+will not (i) exercise any of his or her remaining Copyright and Related
+Rights in the Work or (ii) assert any associated claims and causes of
+action with respect to the Work, in either case contrary to Affirmer's
+express Statement of Purpose.
+
+4. Limitations and Disclaimers.
+
+ a. No trademark or patent rights held by Affirmer are waived, abandoned,
+    surrendered, licensed or otherwise affected by this document.
+ b. Affirmer offers the Work as-is and makes no representations or
+    warranties of any kind concerning the Work, express, implied,
+    statutory or otherwise, including without limitation warranties of
+    title, merchantability, fitness for a particular purpose, non
+    infringement, or the absence of latent or other defects, accuracy, or
+    the present or absence of errors, whether or not discoverable, all to
+    the greatest extent permissible under applicable law.
+ c. Affirmer disclaims responsibility for clearing rights of other persons
+    that may apply to the Work or any use thereof, including without
+    limitation any person's Copyright and Related Rights in the Work.
+    Further, Affirmer disclaims responsibility for obtaining any necessary
+    consents, permissions or other rights required for any use of the
+    Work.
+ d. Affirmer understands and acknowledges that Creative Commons is not a
+    party to this document and has no duty or obligation with respect to
+    this CC0 or use of the Work.
diff --git a/tests/source-package-example/README.txt b/tests/source-package-example/README.txt
new file mode 100644
index 0000000..c6d5da2
--- /dev/null
+++ b/tests/source-package-example/README.txt
@@ -0,0 +1,2 @@
+This is a sample Hydrilla source package. Hydrilla builder can be used to build
+it for distribution.
diff --git a/tests/source-package-example/README.txt.license b/tests/source-package-example/README.txt.license
new file mode 100644
index 0000000..c02cd58
--- /dev/null
+++ b/tests/source-package-example/README.txt.license
@@ -0,0 +1,3 @@
+SPDX-License-Identifier: CC0-1.0
+
+Copyright (C) 2022 Wojtek Kosior <koszko@koszko.org>
diff --git a/tests/source-package-example/bye.js b/tests/source-package-example/bye.js
new file mode 100644
index 0000000..fcd0fdc
--- /dev/null
+++ b/tests/source-package-example/bye.js
@@ -0,0 +1,7 @@
+// SPDX-License-Identifier: CC0-1.0
+
+// Copyright (C) 2021 Wojtek Kosior <koszko@koszko.org>
+//
+// Available under the terms of Creative Commons Zero v1.0 Universal.
+
+console.log(bye_message + "apple!");
diff --git a/tests/source-package-example/hello.js b/tests/source-package-example/hello.js
new file mode 100644
index 0000000..46c0148
--- /dev/null
+++ b/tests/source-package-example/hello.js
@@ -0,0 +1,7 @@
+// SPDX-License-Identifier: CC0-1.0
+
+// Copyright (C) 2021 Wojtek Kosior <koszko@koszko.org>
+//
+// Available under the terms of Creative Commons Zero v1.0 Universal.
+
+console.log(hello_message + "apple!");
diff --git a/tests/source-package-example/index.json b/tests/source-package-example/index.json
new file mode 100644
index 0000000..7162dd7
--- /dev/null
+++ b/tests/source-package-example/index.json
@@ -0,0 +1,207 @@
+// SPDX-License-Identifier: CC0-1.0
+
+// Copyright (C) 2021, 2022 Wojtek Kosior <koszko@koszko.org>
+// Available under the terms of Creative Commons Zero v1.0 Universal.
+
+// This is an example index.json file describing Hydrilla site content. As you
+// can see, for storing site content information Hydrilla utilizes JSON with an
+// additional extension in the form of '//' comments support.
+
+// An index.json file conveys definitions of site resources and pattern->payload
+// mappings. The definitions may reference files under index.json's containing
+// directory, using relative paths. This is how scripts, license texts, etc. are
+// included.
+// File reference always takes the form of an object with "file" property
+// specifying path to the file. In certain contexts additional properties may be
+// allowed or required. Unix paths (using '/' as separator) are assumed. It is
+// not allowed for an index.json file to reference files outside its directory.
+
+// Certain objects are allowed to contain a "comment" field. Although '//'
+// comments can be used in index.json files, they will not be included in
+// generated JSON definitions. If a comment should be included in the
+// definitions served by Hydrilla API, it should be put in a "comment" field of
+// the proper object.
+
+// Unknown object properties will be ignored. This is for compatibility with
+// possible future revisions of the format.
+{
+    // Once our index.json schema changes, this field's value will change. Our
+    // software will be able to handle both current and older formats thanks to
+    // this information present in every index.json file. Schemas that differ by
+    // the first (major) number are always incompatible (e.g. a Hydrilla builder
+    // instance released at the time of 1.2 being the most recent schema version
+    // will not understand version 2.1).
+    // Schemas that are backwards-compatible will have the same major number
+    // and might differ by the second (minor) version number. The third (patch)
+    // and subsequent numbers are being ignored right now.
+    "$schema": "https://hydrilla.koszko.org/schemas/package_source-1.schema.json",
+
+    // Used when referring to this source package. Should be consize, unique
+    // (among other source package names) and can only use a restricted set of
+    // characters. It has to match: [-0-9a-z.]+
+    "source_name": "hello",
+
+    // This property lists files that contain copyright information regarding
+    // this source package as well as texts of licenses used. Although no
+    // specific format of these files is mandated, it is recommended to make
+    // each source package REUSE-compliant, generate an spdx report for it as
+    // `report.spdx` and list this report together with all license files here.
+    "copyright":  [
+	{"file": "report.spdx"},
+	{"file": "LICENSES/CC0-1.0.txt"}
+    ],
+
+    // Where this software/work initially comes from.
+    "upstream_url": "https://git.koszko.org/hydrilla-source-package-example",
+
+    // Additional "comment" field can be used if needed.
+    // "comment": ""
+
+    // List of actual site resources and pattern->payload mappings. Each of them
+    // is represented by an object. Meta-sites and replacement site interfaces
+    // will also belong here once they get implemented.
+    "definitions": [
+	{
+	    // Value of "type" can currently be one of: "resource" and
+	    // "mapping". The one we have here, "resource", defines a list
+	    // of injectable scripts that can be used as a payload or as a
+	    // dependency of another "resource". In the future CSS style sheets
+	    // and WASM modules will also be composite parts of a "resource" as
+	    // scripts are now.
+	    "type": "resource",
+
+	    // Used when referring to this resource in "dependencies" list of
+	    // another resource or in "payload" field of a mapping. Should
+	    // be consize and can only use a restricted set of characters. It
+	    // has to match: [-0-9a-z]+
+	    "identifier": "helloapple",
+
+	    // "long_name" should be used to specify a user-friendly alternative
+	    // to an identifier. It should generally not collide with a long
+	    // name of some resource with a different UUID and also shouldn't
+	    // change in-between versions of the same resource, although
+	    // exceptions to both rules might be considered. Long name is
+	    // allowed to contain arbitrary unicode characters (within reason!).
+	    "long_name": "Hello Apple",
+
+	    // Item definitions contain version information. Version is
+	    // represented as an array of integers, with major version number
+	    // being the first array item. In case of resources, version is
+	    // accompanied by a revision field which contains a positive
+	    // integer. If versions specified by arrays of different length need
+	    // to be compared, the shorter array gets padded with zeroes on the
+	    // right. This means that for example version 1.3 could be given as
+	    // both [1, 3] and [1, 3, 0, 0] (aka 1.3.0.0) and either would mean
+	    // the same.
+	    // Different versions (e.g. 1.0 and 1.3) of the same resource can be
+	    // defined in separate index.json files. This makes it easy to
+	    // accidently cause an identifier clash. To help detect it, we allow
+	    // each resource to have a UUID associated with it. Attempt to
+	    // define multiple resources with the same identifier and different
+	    // UUIDs will result in an error being reported. Defining multiple
+	    // resources with different identifiers and the same UUID is
+	    // disallowed for now (it may be later permitted if we consider it
+	    // good for some use-case).
+	    // As of package source schema version 1.0, UUIDs are optional and
+	    // can be omitted.
+	    "uuid": "a6754dcb-58d8-4b7a-a245-24fd7ad4cd68",
+
+	    // Version should match the upstream version of the resource (e.g. a
+	    // version of javascript library). Revision number starts as 1 for
+	    // each new resource version and gets incremented by 1 each time a
+	    // modification to the packaging of this version is done. Hydrilla
+	    // will allow multiple definitions of the same resource to load, as
+	    // long as their versions differ. Thanks to the "version" and
+	    // "revision" fields, clients will know they have to update certain
+	    // resource after it has been updated. If multiple definitions of
+	    // the same version of given resource are provided, an error is
+	    // generated (even if those definitions differ by revision number).
+	    "version": [2021, 11, 10],
+	    "revision": 1,
+
+	    // A short, meaningful description of what the resource is and/or
+	    // what it does.
+	    "description": "greets an apple",
+
+	    // If needed, a "comment" field can be added to provide some
+	    // additional information.
+	    // "comment": "this resource something something",
+
+	    // Resource's "dependencies" array shall contain names of other
+	    // resources that (in case of scripts at least) should get evaluated
+	    // on a page before this resource's own scripts.
+	    "dependencies": [{"identifier": "hello-message"}],
+
+	    // Array of javascript files that belong to this resource.
+	    "scripts": [
+		{"file": "hello.js"},
+		{"file":   "bye.js"}
+	    ]
+	}, {
+	    "type":	   "resource",
+	    "identifier":  "hello-message",
+	    "long_name":   "Hello Message",
+	    "uuid":	   "1ec36229-298c-4b35-8105-c4f2e1b9811e",
+	    "version":     [2021, 11, 10],
+	    "revision":    2,
+	    "description": "define messages for saying hello and bye",
+	    // If "dependencies" is empty, it can also be omitted.
+	    // "dependencies": [],
+	    "scripts": [{"file": "message.js"}]
+	}, {
+	    "type": "mapping",
+
+	    // Has similar function to resource's identifier. Should be consize
+	    // and can only use a restricted set of characters. It has to match:
+	    // [-0-9a-z]+
+	    // It can be the same as some resource identifier (those are
+	    // different entities and are treated separately).
+	    "identifier": "helloapple",
+
+	    // "long name" and "uuid" have the same meaning as in the case of
+	    // resources and "uuid" is also optional. UUIDs of a resource and a
+	    // mapping can technically be the same but it is recommended to
+	    // avoid even this kind of repetition.
+	    "long_name": "Hello Apple",
+	    "uuid": "54d23bba-472e-42f5-9194-eaa24c0e3ee7",
+
+	    // "version" differs from its counterpart in resource in that it has
+	    // no accompanying revision number.
+	    "version": [2021, 11, 10],
+
+	    // A short, meaningful description of what the mapping does.
+	    "description": "causes apple to get greeted on Hydrillabugs issue tracker",
+
+	    // A comment, if necessary.
+	    // "comment": "blah blah because bleh"
+
+	    // The "payloads" object specifies which payloads are to be applied
+	    // to which URLs.
+	    "payloads": {
+		// Each key should be a valid Haketilo URL pattern.
+		"https://hydrillabugs.koszko.org/***": {
+		    // Should be the name of an existing resource. The resource
+		    // may, but doesn't have to, be defined in the same
+		    // index.json file.
+		    "identifier": "helloapple"
+		},
+		// More associations may follow.
+		"https://hachettebugs.koszko.org/***": {
+		    "identifier": "helloapple"
+		}
+	    }
+	}
+    ],
+    // We can also list additional files to include in the produced source
+    // archive. Hydrilla builder will then include those together with all
+    // script and copyright files used.
+    "additional_files": [
+	{"file": "README.txt"},
+	{"file": "README.txt.license"},
+	{"file": ".reuse/dep5"}
+    ],
+    // We can optionally tell Hydrilla builder to run the REUSE tool to generate
+    // report.spdx file. Using this option requires REUSE to be installed and
+    // and importable in the Python virtualenv used by Hydrilla builder.
+    "reuse_generate_spdx_report": true
+}
diff --git a/tests/source-package-example/message.js b/tests/source-package-example/message.js
new file mode 100644
index 0000000..2ad61cb
--- /dev/null
+++ b/tests/source-package-example/message.js
@@ -0,0 +1,8 @@
+// SPDX-License-Identifier: CC0-1.0
+
+// Copyright (C) 2021 Wojtek Kosior <koszko@koszko.org>
+//
+// Available under the terms of Creative Commons Zero v1.0 Universal.
+
+var hello_message = "hello, "
+var bye_message = "bye, "
diff --git a/tests/test_hydrilla_builder.py b/tests/test_hydrilla_builder.py
new file mode 100644
index 0000000..851b5cd
--- /dev/null
+++ b/tests/test_hydrilla_builder.py
@@ -0,0 +1,472 @@
+# SPDX-License-Identifier: CC0-1.0
+
+# Copyright (C) 2022 Wojtek Kosior <koszko@koszko.org>
+#
+# Available under the terms of Creative Commons Zero v1.0 Universal.
+
+# Enable using with Python 3.7.
+from __future__ import annotations
+
+import pytest
+import json
+import shutil
+
+from tempfile import TemporaryDirectory
+from pathlib import Path
+from hashlib import sha256, sha1
+from zipfile import ZipFile
+from typing import Callable, Optional, Iterable
+
+from jsonschema import ValidationError
+
+from hydrilla import util as hydrilla_util
+from hydrilla.builder import build, _version
+
+here = Path(__file__).resolve().parent
+
+expected_generated_by = {
+    'name': 'hydrilla.builder',
+    'version': _version.version
+}
+
+default_srcdir = here / 'source-package-example'
+
+default_js_filenames = ['bye.js', 'hello.js', 'message.js']
+default_dist_filenames = [*default_js_filenames, 'LICENSES/CC0-1.0.txt']
+default_src_filenames = [
+    *default_dist_filenames,
+    'README.txt', 'README.txt.license', '.reuse/dep5', 'index.json'
+]
+
+default_sha1_hashes   = {}
+default_sha256_hashes = {}
+default_contents      = {}
+
+for fn in default_src_filenames:
+    with open(default_srcdir / fn, 'rb') as file_handle:
+        default_contents[fn]      = file_handle.read()
+        default_sha256_hashes[fn] = sha256(default_contents[fn]).digest().hex()
+        default_sha1_hashes[fn]   = sha1(default_contents[fn]).digest().hex()
+
+class CaseSettings:
+    """Gather parametrized values in a class."""
+    def __init__(self):
+        """Init CaseSettings with default values."""
+        self.srcdir = default_srcdir
+        self.index_json_path = Path('index.json')
+        self.report_spdx_included = True
+
+        self.js_filenames   = default_js_filenames.copy()
+        self.dist_filenames = default_dist_filenames.copy()
+        self.src_filenames  = default_src_filenames.copy()
+
+        self.sha1_hashes   = default_sha1_hashes.copy()
+        self.sha256_hashes = default_sha256_hashes.copy()
+        self.contents      = default_contents.copy()
+
+        self.expected_resources = [{
+            '$schema': 'https://hydrilla.koszko.org/schemas/api_resource_description-1.schema.json',
+            'source_name': 'hello',
+            'source_copyright': [{
+                'file': 'report.spdx',
+                'sha256': '!!!!value to fill during test!!!!'
+            }, {
+                'file': 'LICENSES/CC0-1.0.txt',
+                'sha256': self.sha256_hashes['LICENSES/CC0-1.0.txt']
+            }],
+            'type': 'resource',
+            'identifier': 'helloapple',
+            'long_name': 'Hello Apple',
+            'uuid': 'a6754dcb-58d8-4b7a-a245-24fd7ad4cd68',
+            'version': [2021, 11, 10],
+            'revision': 1,
+            'description': 'greets an apple',
+            'dependencies': [{'identifier': 'hello-message'}],
+            'scripts': [{
+                'file': 'hello.js',
+                'sha256': self.sha256_hashes['hello.js']
+            }, {
+                'file': 'bye.js',
+                'sha256': self.sha256_hashes['bye.js']
+            }],
+            'generated_by': expected_generated_by
+        }, {
+            '$schema': 'https://hydrilla.koszko.org/schemas/api_resource_description-1.schema.json',
+            'source_name': 'hello',
+            'source_copyright': [{
+                'file': 'report.spdx',
+                'sha256': '!!!!value to fill during test!!!!'
+            }, {
+                'file': 'LICENSES/CC0-1.0.txt',
+                'sha256': self.sha256_hashes['LICENSES/CC0-1.0.txt']
+            }],
+            'type': 'resource',
+            'identifier': 'hello-message',
+            'long_name': 'Hello Message',
+            'uuid': '1ec36229-298c-4b35-8105-c4f2e1b9811e',
+            'version': [2021, 11, 10],
+            'revision': 2,
+            'description': 'define messages for saying hello and bye',
+            'dependencies': [],
+            'scripts': [{
+                'file': 'message.js',
+                'sha256': self.sha256_hashes['message.js']
+            }],
+            'generated_by': expected_generated_by
+        }]
+        self.expected_mapping = {
+            '$schema': 'https://hydrilla.koszko.org/schemas/api_mapping_description-1.schema.json',
+            'source_name': 'hello',
+            'source_copyright': [{
+                'file': 'report.spdx',
+                'sha256': '!!!!value to fill during test!!!!'
+            }, {
+                'file': 'LICENSES/CC0-1.0.txt',
+                'sha256': self.sha256_hashes['LICENSES/CC0-1.0.txt']
+            }],
+            'type': 'mapping',
+	    'identifier': 'helloapple',
+	    'long_name': 'Hello Apple',
+	    'uuid': '54d23bba-472e-42f5-9194-eaa24c0e3ee7',
+	    'version': [2021, 11, 10],
+	    'description': 'causes apple to get greeted on Hydrillabugs issue tracker',
+	    'payloads': {
+	        'https://hydrillabugs.koszko.org/***': {
+		    'identifier': 'helloapple'
+	        },
+	        'https://hachettebugs.koszko.org/***': {
+		    'identifier': 'helloapple'
+                }
+            },
+            'generated_by': expected_generated_by
+        }
+        self.expected_source_description = {
+            '$schema': 'https://hydrilla.koszko.org/schemas/api_source_description-1.schema.json',
+            'source_name': 'hello',
+            'source_copyright': [{
+                'file': 'report.spdx',
+                'sha256': '!!!!value to fill during test!!!!'
+            }, {
+                'file': 'LICENSES/CC0-1.0.txt',
+                'sha256': self.sha256_hashes['LICENSES/CC0-1.0.txt']
+            }],
+            'source_archives': {
+                'zip': {
+                    'sha256': '!!!!value to fill during test!!!!',
+                }
+            },
+            'upstream_url': 'https://git.koszko.org/hydrilla-source-package-example',
+            'definitions': [{
+                'type': 'resource',
+                'identifier': 'helloapple',
+                'long_name': 'Hello Apple',
+                'version': [2021, 11, 10],
+            }, {
+                'type':       'resource',
+                'identifier': 'hello-message',
+                'long_name': 'Hello Message',
+                'version':     [2021, 11, 10],
+            }, {
+                'type': 'mapping',
+                'identifier': 'helloapple',
+	        'long_name': 'Hello Apple',
+                'version': [2021, 11, 10],
+            }],
+            'generated_by': expected_generated_by
+        }
+
+    def expected(self) -> list[dict]:
+        """
+        Convenience method to get a list of expected jsons of 2 resources,
+        1 mapping and 1 source description we have.
+        """
+        return [
+            *self.expected_resources,
+            self.expected_mapping,
+            self.expected_source_description
+        ]
+
+ModifyCb = Callable[[CaseSettings, dict], Optional[str]]
+
+def prepare_modified(tmpdir: Path, modify_cb: ModifyCb) -> CaseSettings:
+    """
+    Use sample source package directory with an alternative, modified
+    index.json.
+    """
+    settings = CaseSettings()
+
+    for fn in settings.src_filenames:
+        copy_path = tmpdir / 'srcdir_copy' / fn
+        copy_path.parent.mkdir(parents=True, exist_ok=True)
+        shutil.copy(settings.srcdir / fn, copy_path)
+
+    settings.srcdir = tmpdir / 'srcdir_copy'
+
+    with open(settings.srcdir / 'index.json', 'rt') as file_handle:
+        obj = json.loads(hydrilla_util.strip_json_comments(file_handle.read()))
+
+    contents = modify_cb(settings, obj)
+
+    # Replace the other index.json with new one
+    settings.index_json_path = tmpdir / 'replacement.json'
+
+    if contents is None:
+        contents = json.dumps(obj)
+
+    contents = contents.encode()
+
+    settings.contents['index.json'] = contents
+
+    settings.sha256_hashes['index.json'] = sha256(contents).digest().hex()
+    settings.sha1_hashes['index.json']   = sha1(contents).digest().hex()
+
+    with open(settings.index_json_path, 'wb') as file_handle:
+        file_handle.write(contents)
+
+    return settings
+
+@pytest.fixture()
+def tmpdir() -> Iterable[str]:
+    with TemporaryDirectory() as tmpdir:
+        yield tmpdir
+
+def prepare_default(tmpdir: Path) -> CaseSettings:
+    """Use sample source package directory as exists in VCS."""
+    return CaseSettings()
+
+def modify_index_good(settings: CaseSettings, obj: dict) -> None:
+    """
+    Modify index.json object to make a slightly different but *also correct* one
+    that can be used to test some different cases.
+    """
+    # Add comments that should be preserved.
+    for dictionary in (obj, settings.expected_source_description):
+        dictionary['comment'] = 'index_json comment'
+
+    for i, dicts in enumerate(zip(obj['definitions'], settings.expected())):
+        for dictionary in dicts:
+            dictionary['comment'] = f'item {i}'
+
+    # Remove spdx report generation
+    del obj['reuse_generate_spdx_report']
+    obj['copyright'].remove({'file': 'report.spdx'})
+
+    settings.report_spdx_included = False
+
+    for json_description in settings.expected():
+        json_description['source_copyright'] = \
+            [fr for fr in json_description['source_copyright']
+             if fr['file'] != 'report.spdx']
+
+    # Use default value ([]) for 'additionall_files' property
+    del obj['additional_files']
+
+    settings.src_filenames = [*settings.dist_filenames, 'index.json']
+
+    # Use default value ([]) for 'scripts' property in one of the resources
+    del obj['definitions'][1]['scripts']
+
+    settings.expected_resources[1]['scripts'] = []
+
+    for prefix in ('js', 'dist', 'src'):
+        getattr(settings, f'{prefix}_filenames').remove('message.js')
+
+    # Use default value ({}) for 'pyloads' property in mapping
+    del obj['definitions'][2]['payloads']
+
+    settings.expected_mapping['payloads'] = {}
+
+    # Don't use UUIDs (they are optional)
+    for definition in obj['definitions']:
+        del definition['uuid']
+
+    for description in settings.expected():
+        if 'uuid' in description:
+            del description['uuid']
+
+    # Add some unrecognized properties that should be stripped
+    to_process = [obj]
+    while to_process:
+        processed = to_process.pop()
+
+        if type(processed) is list:
+            to_process.extend(processed)
+        elif type(processed) is dict and 'spurious_property' not in processed:
+            to_process.extend(processed.values())
+            processed['spurious_property'] = 'some value'
+
+@pytest.mark.parametrize('prepare_source_example', [
+    prepare_default,
+    lambda tmpdir: prepare_modified(tmpdir, modify_index_good)
+])
+def test_build(tmpdir, prepare_source_example):
+    """Build the sample source package and verify the produced files."""
+    # First, build the package
+    dstdir = Path(tmpdir) / 'dstdir'
+    tmpdir = Path(tmpdir) / 'example'
+
+    dstdir.mkdir(exist_ok=True)
+    tmpdir.mkdir(exist_ok=True)
+
+    settings = prepare_source_example(tmpdir)
+
+    build.Build(settings.srcdir, settings.index_json_path)\
+        .write_package_files(dstdir)
+
+    # Verify directories under destination directory
+    assert {'file', 'resource', 'mapping', 'source'} == \
+        set([path.name for path in dstdir.iterdir()])
+
+    # Verify files under 'file/'
+    file_dir = dstdir / 'file' / 'sha256'
+
+    for fn in settings.dist_filenames:
+        dist_file_path = file_dir / settings.sha256_hashes[fn]
+        assert dist_file_path.is_file()
+
+        assert dist_file_path.read_bytes() == settings.contents[fn]
+
+    sha256_hashes_set = set([settings.sha256_hashes[fn]
+                             for fn in settings.dist_filenames])
+
+    spdx_report_sha256 = None
+
+    for path in file_dir.iterdir():
+        if path.name in sha256_hashes_set:
+            continue
+
+        assert spdx_report_sha256 is None and settings.report_spdx_included
+
+        with open(path, 'rt') as file_handle:
+            spdx_contents = file_handle.read()
+
+        spdx_report_sha256 = sha256(spdx_contents.encode()).digest().hex()
+        assert spdx_report_sha256 == path.name
+
+        for fn in settings.src_filenames:
+            if not any([n in fn.lower() for n in ('license', 'reuse')]):
+                assert settings.sha1_hashes[fn]
+
+    if settings.report_spdx_included:
+        assert spdx_report_sha256
+        for obj in settings.expected():
+            for file_ref in obj['source_copyright']:
+                if file_ref['file'] == 'report.spdx':
+                    file_ref['sha256'] = spdx_report_sha256
+
+    # Verify files under 'resource/'
+    resource_dir = dstdir / 'resource'
+
+    assert set([rj['identifier'] for rj in settings.expected_resources]) == \
+        set([path.name for path in resource_dir.iterdir()])
+
+    for resource_json in settings.expected_resources:
+        subdir = resource_dir / resource_json['identifier']
+        assert ['2021.11.10'] == [path.name for path in subdir.iterdir()]
+
+        with open(subdir / '2021.11.10', 'rt') as file_handle:
+            assert json.load(file_handle) == resource_json
+
+        hydrilla_util.validator_for('api_resource_description-1.0.1.schema.json')\
+                     .validate(resource_json)
+
+    # Verify files under 'mapping/'
+    mapping_dir = dstdir / 'mapping'
+    assert ['helloapple'] == [path.name for path in mapping_dir.iterdir()]
+
+    subdir = mapping_dir / 'helloapple'
+    assert ['2021.11.10'] == [path.name for path in subdir.iterdir()]
+
+    with open(subdir / '2021.11.10', 'rt') as file_handle:
+        assert json.load(file_handle) == settings.expected_mapping
+
+    hydrilla_util.validator_for('api_mapping_description-1.0.1.schema.json')\
+                 .validate(settings.expected_mapping)
+
+    # Verify files under 'source/'
+    source_dir = dstdir / 'source'
+    assert {'hello.json', 'hello.zip'} == \
+        set([path.name for path in source_dir.iterdir()])
+
+    zip_filenames = [f'hello/{fn}' for fn in settings.src_filenames]
+
+    with ZipFile(source_dir / 'hello.zip', 'r') as archive:
+        assert set([f.filename for f in archive.filelist]) == set(zip_filenames)
+
+        for zip_fn, src_fn in zip(zip_filenames, settings.src_filenames):
+            with archive.open(zip_fn, 'r') as zip_file_handle:
+                assert zip_file_handle.read() == settings.contents[src_fn]
+
+    zip_ref = settings.expected_source_description['source_archives']['zip']
+    with open(source_dir / 'hello.zip', 'rb') as file_handle:
+        zip_ref['sha256'] = sha256(file_handle.read()).digest().hex()
+
+    with open(source_dir / 'hello.json', 'rt') as file_handle:
+        assert json.load(file_handle) == settings.expected_source_description
+
+    hydrilla_util.validator_for('api_source_description-1.0.1.schema.json')\
+                 .validate(settings.expected_source_description)
+
+def modify_index_missing_file(dummy: CaseSettings, obj: dict) -> None:
+    """
+    Modify index.json to expect missing report.spdx file and cause an error.
+    """
+    del obj['reuse_generate_spdx_report']
+
+def modify_index_schema_error(dummy: CaseSettings, obj: dict) -> None:
+    """Modify index.json to be incompliant with the schema."""
+    del obj['definitions']
+
+def modify_index_bad_comment(dummy: CaseSettings, obj: dict) -> str:
+    """Modify index.json to have an invalid '/' in it."""
+    return json.dumps(obj) + '/something\n'
+
+def modify_index_bad_json(dummy: CaseSettings, obj: dict) -> str:
+    """Modify index.json to not be valid json even after comment stripping."""
+    return json.dumps(obj) + '???/\n'
+
+def modify_index_missing_license(settings: CaseSettings, obj: dict) -> None:
+    """Remove a file to make package REUSE-incompliant."""
+    (settings.srcdir / 'README.txt.license').unlink()
+
+def modify_index_file_outside(dummy: CaseSettings, obj: dict) -> None:
+    """Make index.json illegally reference a file outside srcdir."""
+    obj['copyright'].append({'file': '../abc'})
+
+def modify_index_reference_itself(dummy: CaseSettings, obj: dict) -> None:
+    """Make index.json illegally reference index.json."""
+    obj['copyright'].append({'file': 'index.json'})
+
+def modify_index_report_excluded(dummy: CaseSettings, obj: dict) -> None:
+    """
+    Make index.json require generation of index.json but not include it among
+    copyright files.
+    """
+    obj['copyright'] = [fr for fr in obj['copyright']
+                        if fr['file'] != 'report.spdx']
+
+@pytest.mark.parametrize('break_index_json', [
+    (modify_index_missing_file,     FileNotFoundError),
+    (modify_index_schema_error,     ValidationError),
+    (modify_index_bad_comment,      json.JSONDecodeError),
+    (modify_index_bad_json,         json.JSONDecodeError),
+    (modify_index_missing_license,  build.ReuseError),
+    (modify_index_file_outside,     build.FileReferenceError),
+    (modify_index_reference_itself, build.FileReferenceError),
+    (modify_index_report_excluded,  build.FileReferenceError)
+])
+def test_build_error(tmpdir: str, break_index_json: tuple[ModifyCb, type]):
+    """Build the sample source package and verify the produced files."""
+    dstdir = Path(tmpdir) / 'dstdir'
+    tmpdir = Path(tmpdir) / 'example'
+
+    dstdir.mkdir(exist_ok=True)
+    tmpdir.mkdir(exist_ok=True)
+
+    modify_cb, error_type = break_index_json
+
+    settings = prepare_modified(tmpdir, modify_cb)
+
+    with pytest.raises(error_type):
+        build.Build(settings.srcdir, settings.index_json_path)\
+            .write_package_files(dstdir)