Keep the version fallback in shallow builds

A checkout without tags made `git describe` fail and the empty result
overwrote the fallback, so CI release binaries carried no version at
all. The release workflow now also fetches tags so a tag build stamps
its exact version.

2 files changed, 8 insertions, 2 deletions

diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 7269512..12226f9 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -16,6 +16,10 @@ jobs:
       - uses: actions/checkout@v7
         with:
           submodules: recursive
+          # Tags let git describe stamp the exact release version into
+          # the binary rather than the Makefile fallback.
+          fetch-tags: true
+          fetch-depth: 0
       - name: Install build dependencies
         run: |
           sudo apt-get update
diff --git a/source/gen-version.sh b/source/gen-version.sh
index 23d0d0b..fb7d459 100755
--- a/source/gen-version.sh
+++ b/source/gen-version.sh
@@ -9,10 +9,12 @@
 V=$1
 OUT=${2:-VERSION}
 
-# Prefer `git describe` when run at the top of the cgit working tree.
+# Prefer `git describe` when run at the top of the cgit working tree,
+# keeping the fallback when it fails, as in a shallow tagless clone.
 if test "$(git rev-parse --git-dir 2>/dev/null)" = '.git'
 then
-	V=$(git describe --abbrev=4 HEAD 2>/dev/null)
+	D=$(git describe --abbrev=4 HEAD 2>/dev/null)
+	test -n "$D" && V=$D
 fi
 
 new="CGIT_VERSION = $V"