sample commit-msg hook: no silent exit on duplicate Signed-off-by lines

git-commit would silently exit if duplicate Signed-off-by
lines were found.  Users of git-commit would not know it,
unless they checked '$?'.  This patch makes git-commit
actually print out a message that nothing was commited
since duplicate Signed-off-lines were found.

Signed-off-by: Luben Tuikov <ltuikov@yahoo.com>
Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/templates/hooks--commit-msg b/templates/hooks--commit-msg
index 23617f390611f5221149ec1b9bbc5d72092fd04d..0b906caa98f3d4deced75d196d969d7216d31961 100644 (file)
--- a/templates/hooks--commit-msg
+++ b/templates/hooks--commit-msg
@@ -11,4 +11,8 @@
 # This example catches duplicate Signed-off-by lines.
 
 test "" = "$(grep '^Signed-off-by: ' "$1" |
-        sort | uniq -c | sed -e '/^[   ]*1[    ]/d')"
+        sort | uniq -c | sed -e '/^[   ]*1[    ]/d')" || {
+       echo >&2 Duplicate Signed-off-by lines.
+       exit 1
+}
+