guix: download: Add support for git repositories.

* guix/scripts/download.scm (git-download-to-store*): Add new variable.
(copy-recursively-without-dot-git): New variable.
(git-download-to-file): Add new variable.
(show-help): Add 'git', 'commit', 'branch' and 'recursive'options
help message.
(%default-options): Add default value for 'git-reference' and
'recursive' options.
(%options): Add 'git', 'commit', 'branch' and 'recursive' command
line options.
(guix-download) [hash]: Compute hash with 'file-hash*' instead of
'port-hash' from (gcrypt hash) module. This allows us to compute
hashes for directories.
* doc/guix.texi (Invoking guix-download): Add @item entries for
`git', `commit', `branch' and `recursive' options. Add a paragraph in
the introduction.
* tests/guix-download.sh: New tests. Move variables and trap definition
to the top of the file.

Change-Id: Ic2c428dca4cfcb0d4714ed361a4c46609339140a
Signed-off-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>
Reviewed-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>

1 files changed, 43 insertions, 2 deletions

diff --git a/tests/guix-download.sh b/tests/guix-download.sh
index f4cb335eef..d4cd2ea6b9 100644
--- a/tests/guix-download.sh
+++ b/tests/guix-download.sh
@@ -16,6 +16,12 @@
 # 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 some files/folders needed for the tests.
+output="t-download-$$"
+test_git_repo="$(mktemp -d)"
+output_dir="t-archive-dir-$$"
+trap 'rm -rf "$test_git_repo" ; rm -f "$output" ; rm -rf "$output_dir"' EXIT
+
 #
 # Test the `guix download' command-line utility.
 #
@@ -36,8 +42,6 @@ guix download "file://$abs_top_srcdir/README"
 guix download "$abs_top_srcdir/README"
 
 # This one too, even if it cannot talk to the daemon.
-output="t-download-$$"
-trap 'rm -f "$output"' EXIT
 GUIX_DAEMON_SOCKET="/nowhere" guix download -o "$output" \
 		  "file://$abs_top_srcdir/README"
 cmp "$output" "$abs_top_srcdir/README"
@@ -45,4 +49,41 @@ cmp "$output" "$abs_top_srcdir/README"
 # This one should fail.
 guix download "file:///does-not-exist" "file://$abs_top_srcdir/README" && false
 
+# Test git support with local repository.
+# First, create a dummy git repo in the temporary directory.
+(
+    cd $test_git_repo
+    git init
+    touch test
+    git config user.name "User"
+    git config user.email "user@domain"
+    git add test
+    git commit -m "Commit"
+    git tag -a -m "v1" v1
+)
+
+# Extract commit number.
+commit=$((cd $test_git_repo && git log) | head -n 1 | cut -f2 -d' ')
+
+# We expect that guix hash is working properly or at least that the output of
+# 'guix download' is consistent with 'guix hash'.
+expected_hash=$(guix hash -rx $test_git_repo)
+
+# Test the different options
+for option in "" "--commit=$commit" "--commit=v1" "--branch=master"
+do
+    command_output="$(guix download --git $option "file://$test_git_repo")"
+    computed_hash="$(echo $command_output | cut -f2 -d' ')"
+    store_path="$(echo $command_output | cut -f1 -d' ')"
+    [ "$expected_hash" = "$computed_hash" ]
+    diff -r -x ".git" $test_git_repo $store_path
+done
+
+# Should fail.
+guix download --git --branch=non_existent "file://$test_git_repo" && false
+
+# Same but download to file instead of store.
+guix download --git "file://$test_git_repo" -o $output_dir
+diff -r -x ".git" $test_git_repo $output_dir
+
 exit 0