guix build: Add '--with-branch' transformation option.

* guix/scripts/build.scm (evaluate-git-replacement-specs)
(transform-package-source-branch): New procedures.
(%transformations, %transformation-options): Add 'with-branch'.
(show-transformation-options-help): Likewise.
* tests/guix-build-branch.sh: New file.
* Makefile.am (SH_TESTS): Add it.
* doc/guix.texi (Package Transformation Options): Document it.

1 files changed, 48 insertions, 0 deletions

diff --git a/tests/guix-build-branch.sh b/tests/guix-build-branch.sh
new file mode 100644
index 0000000000..bc50d9c0ef
--- /dev/null
+++ b/tests/guix-build-branch.sh
@@ -0,0 +1,48 @@
+# GNU Guix --- Functional package management for GNU
+# Copyright © 2018 Ludovic Courtès <ludo@gnu.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/>.
+
+#
+# Test 'guix build --with-branch'.
+#
+
+guix build --version
+
+# 'guix build --with-branch' requires access to the network to clone the
+# Git repository below.
+
+if ! guile -c '(getaddrinfo "www.gnu.org" "80" AI_NUMERICSERV)' 2> /dev/null
+then
+    # Skipping.
+    exit 77
+fi
+
+orig_drv="`guix build guile-gcrypt -d`"
+latest_drv="`guix build guile-gcrypt --with-branch=guile-gcrypt=master -d`"
+test -n "$latest_drv"
+test "$orig_drv" != "$latest_drv"
+
+# FIXME: '-S' currently doesn't work with non-derivation source.
+# checkout="`guix build guile-gcrypt --with-branch=guile-gcrypt=master -S`"
+checkout="`guix gc --references "$latest_drv" | grep guile-gcrypt | grep -v -E '(-builder|\.drv)'`"
+test -d "$checkout"
+test -f "$checkout/COPYING"
+
+orig_drv="`guix build guix -d`"
+latest_drv="`guix build guix --with-branch=guile-gcrypt=master -d`"
+guix gc -R "$latest_drv" | grep guile-gcrypt-git.master
+test "$orig_drv" != "$latest_drv"