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+# 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 describe'.
+#
+
+guix describe --version
+
+tmpfile="t-guix-describe-$$"
+trap "rm -f $tmpfile" EXIT
+rm -f "$tmpfile"
+
+if [ -d "$abs_top_srcdir/.git" ]
+then
+ # Since we're in a Git checkout, we can at least check that these things
+ # work.
+ guix describe | grep -i "checkout"
+ if git --version > /dev/null 2>&1
+ then
+ result="`guix describe | grep commit: | cut -d : -f 2-`"
+ commit="`git log | head -1 | cut -c 7-`"
+ test "x$result" = "x$commit"
+ fi
+ guix describe -f channels
+ case "`guix describe -f channels | grep url`" in
+ *"(url \"$abs_top_srcdir\")") true;;
+ *) false;;
+ esac
+else
+ exit 77
+fi