sh: add script to build the gitTable

garlic/sh/default.nix

@@ -34,5 +34,6 @@ in
       chmod +x $out/bin/garlic
       mkdir -p $out/share/man/man1
       cp garlic.1 $out/share/man/man1
+      cp garlic-git-table $out/bin
     '';
   }

garlic/sh/garlic-git-table

@@ -0,0 +1,25 @@
+#!/bin/sh
+
+progname="$(basename $0)"
+
+if [ -z "$1" ]; then
+	cat >&2 <<EOF
+Usage: $progname <git repo URL>
+
+Finds all garlic/* branches and their current commit of the given
+repository and builds the gitTable to be used in nix derivations.
+
+Example:
+  garlic-git-table ssh://git@bscpm03.bsc.es/garlic/apps/heat.git
+EOF
+	exit 1
+fi
+
+echo 'gitTable = {'
+echo "  # Auto-generated with $progname on $(date --rfc-3339=date)"
+git ls-remote $1 'garlic/*' |\
+	sed 's@refs/heads/@@' |\
+	awk '{printf "\"%s\" = \"%s\";\n", $2, $1}' |\
+	column -t -o ' ' |\
+	sed 's/^/  /'
+echo '};'