Add 'python-build-system'.

* guix/build-system/python.scm, guix/build/python-build-system.scm: New files.
* Makefile.am (MODULES): Add them.

3 files changed, 208 insertions, 0 deletions

diff --git a/Makefile.am b/Makefile.am
index 1e440627e1..eddcd5ac9b 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -46,6 +46,7 @@ MODULES =					\
   guix/build-system/cmake.scm			\
   guix/build-system/gnu.scm			\
   guix/build-system/perl.scm			\
+  guix/build-system/python.scm			\
   guix/build-system/trivial.scm			\
   guix/ftp-client.scm				\
   guix/web.scm					\
@@ -56,6 +57,7 @@ MODULES =					\
   guix/build/cmake-build-system.scm		\
   guix/build/gnu-build-system.scm		\
   guix/build/perl-build-system.scm		\
+  guix/build/python-build-system.scm		\
   guix/build/utils.scm				\
   guix/build/union.scm				\
   guix/build/rpath.scm				\
diff --git a/guix/build-system/python.scm b/guix/build-system/python.scm
new file mode 100644
index 0000000000..2457e1c57d
--- /dev/null
+++ b/guix/build-system/python.scm
@@ -0,0 +1,115 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2013 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2013 Nikita Karetnikov <nikita@karetnikov.org>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix 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 General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (guix build-system python)
+  #:use-module (guix store)
+  #:use-module (guix utils)
+  #:use-module (guix packages)
+  #:use-module (guix derivations)
+  #:use-module (guix build-system)
+  #:use-module (guix build-system gnu)
+  #:use-module (ice-9 match)
+  #:export (python-build
+            python-build-system))
+
+;; Commentary:
+;;
+;; Standard build procedure for Python packages using 'setup.py'.  This is
+;; implemented as an extension of 'gnu-build-system'.
+;;
+;; Code:
+
+(define* (python-build store name source inputs
+                       #:key
+                       (python (@ (gnu packages python) python))
+                       (python-version
+                        (string-take (package-version
+                                      (@ (gnu packages python) python)) 3))
+                       (tests? #t)
+                       (configure-flags ''())
+                       (phases '(@ (guix build python-build-system)
+                                   %standard-phases))
+                       (outputs '("out"))
+                       (search-paths '())
+                       (system (%current-system))
+                       (guile #f)
+                       (imported-modules '((guix build python-build-system)
+                                           (guix build gnu-build-system)
+                                           (guix build utils)))
+                       (modules '((guix build python-build-system)
+                                  (guix build gnu-build-system)
+                                  (guix build utils))))
+  "Build SOURCE using PYTHON, and with INPUTS.  This assumes that SOURCE
+provides a 'setup.py' file as its build system."
+  (define python-search-paths
+    (append (package-native-search-paths python)
+            (standard-search-paths)))
+
+  (define builder
+    `(begin
+       (use-modules ,@modules)
+       (python-build #:name ,name
+                     #:source ,(if (and source (derivation-path? source))
+                                   (derivation-path->output-path source)
+                                   source)
+                     #:configure-flags ,configure-flags
+                     #:system ,system
+                     #:test-target "test"
+                     #:tests? ,tests?
+                     #:outputs %outputs
+                     #:python-version ,python-version
+                     #:search-paths ',(map search-path-specification->sexp
+                                           (append python-search-paths
+                                                   search-paths))
+                     #:inputs %build-inputs)))
+
+  (define guile-for-build
+    (match guile
+      ((? package?)
+       (package-derivation store guile system))
+      ((and (? string?) (? derivation-path?))
+       guile)
+      (#f                                         ; the default
+       (let* ((distro (resolve-interface '(gnu packages base)))
+              (guile  (module-ref distro 'guile-final)))
+         (package-derivation store guile system)))))
+
+  (let ((python (package-derivation store python system)))
+    (build-expression->derivation store name system
+                                  builder
+                                  `(,@(if source
+                                          `(("source" ,source))
+                                          '())
+                                    ("python" ,python)
+                                    ,@inputs
+
+                                    ;; Keep the standard inputs of
+                                    ;; 'gnu-build-system'.
+                                    ,@(standard-inputs system))
+
+                                  #:modules imported-modules
+                                  #:outputs outputs
+                                  #:guile-for-build guile-for-build)))
+
+(define python-build-system
+  (build-system (name 'python)
+                (description "The standard Python build system")
+                (build python-build)))
+
+;;; python.scm ends here
diff --git a/guix/build/python-build-system.scm b/guix/build/python-build-system.scm
new file mode 100644
index 0000000000..b892c87fe9
--- /dev/null
+++ b/guix/build/python-build-system.scm
@@ -0,0 +1,91 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2013 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2013 Nikita Karetnikov <nikita@karetnikov.org>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix 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 General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (guix build python-build-system)
+  #:use-module ((guix build gnu-build-system)
+                #:renamer (symbol-prefix-proc 'gnu:))
+  #:use-module (guix build utils)
+  #:use-module (ice-9 match)
+  #:use-module (ice-9 ftw)
+  #:use-module (srfi srfi-1)
+  #:use-module (srfi srfi-26)
+  #:export (%standard-phases
+            python-build))
+
+;; Commentary:
+;;
+;; Builder-side code of the standard Python package build procedure.
+;;
+;; Code:
+
+(define* (install #:key outputs (configure-flags '())
+                  #:allow-other-keys)
+  "Install a given Python package."
+  (let ((out (assoc-ref outputs "out")))
+    (if (file-exists? "setup.py")
+        (let ((args `("setup.py" "install" ,(string-append "--prefix=" out)
+                      ,@configure-flags)))
+          (format #t "running 'python' with arguments ~s~%" args)
+          (zero? (apply system* "python" args)))
+        (error "no setup.py found"))))
+
+(define* (wrap #:key outputs python-version #:allow-other-keys)
+  (define (list-of-files dir)
+    (map (cut string-append dir "/" <>)
+         (or (scandir dir (lambda (f)
+                            (let ((s (stat (string-append dir "/" f))))
+                              (eq? 'regular (stat:type s)))))
+             '())))
+
+  (define bindirs
+    (append-map (match-lambda
+                 ((_ . dir)
+                  (list (string-append dir "/bin")
+                        (string-append dir "/sbin"))))
+                outputs))
+
+  (let* ((out  (assoc-ref outputs "out"))
+         (var `("PYTHONPATH" prefix
+                ,(cons (string-append out "/lib/python"
+                                      python-version "/site-packages")
+                       (search-path-as-string->list
+                        (or (getenv "PYTHONPATH") ""))))))
+    (for-each (lambda (dir)
+                (let ((files (list-of-files dir)))
+                  (for-each (cut wrap-program <> var)
+                            files)))
+              bindirs)))
+
+(define %standard-phases
+  ;; 'configure' and 'build' phases are not needed.  Everything is done during
+  ;; 'install'.
+  (alist-cons-after
+   'install 'wrap
+   wrap
+   (alist-replace 'install install
+                  (alist-delete 'configure
+                                (alist-delete 'build
+                                              gnu:%standard-phases)))))
+
+(define* (python-build #:key inputs (phases %standard-phases)
+                       #:allow-other-keys #:rest args)
+  "Build the given Python package, applying all of PHASES in order."
+  (apply gnu:gnu-build #:inputs inputs #:phases phases args))
+
+;;; python-build-system.scm ends here