Avoid updating zfs_gitrev.h when rev is unchanged

Build process would always re-compile spa_history.c due to touching zfs_gitrev.h - avoid if no change in gitrev. Reviewed-by: Brian Behlendorf <[email protected]> Reviewed-by: Chris Dunlop <[email protected]> Reviewed-by: Allan Jude <[email protected]> Signed-off-by: Jorgen Lundman <[email protected]> Closes openzfs#8860
bnjf · Jun 7, 2019 · 876d76b · 876d76b
1 parent fd7a657
commit 876d76b
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/scripts/make_gitrev.sh b/scripts/make_gitrev.sh
@@ -39,3 +39,7 @@ trap cleanup EXIT
 git rev-parse --git-dir > /dev/null 2>&1
 # Get the git current git revision
 ZFS_GIT_REV=$(git describe --always --long --dirty 2>/dev/null)
+# Check if header file already contain the exact string
+grep -sq "\"${ZFS_GIT_REV}\"" "$(dirname "$0")"/../include/zfs_gitrev.h &&
+	trap - EXIT
+exit 0