1 file changed, 25 insertions, 0 deletions
diff --git a/source/gen-version.sh b/source/gen-version.sh
new file mode 100755
index 0000000..23d0d0b
--- /dev/null
+++ b/source/gen-version.sh
@@ -0,0 +1,25 @@
+#!/bin/sh
+
+# Writes a "CGIT_VERSION = ..." line to the output file (default: VERSION),
+# for the build to include. Run from the project root so `git describe` acts
+# on cgit rather than the bundled Git submodule.
+#
+# Usage: gen-version.sh <fallback-version> [output-file]
+
+V=$1
+OUT=${2:-VERSION}
+
+# Prefer `git describe` when run at the top of the cgit working tree.
+if test "$(git rev-parse --git-dir 2>/dev/null)" = '.git'
+then
+	V=$(git describe --abbrev=4 HEAD 2>/dev/null)
+fi
+
+new="CGIT_VERSION = $V"
+old=$(cat "$OUT" 2>/dev/null)
+
+# Exit if the version is already up to date.
+test "$old" = "$new" && exit 0
+
+echo "$new" > "$OUT"
+cat "$OUT"