[PATCH v2 3/3] hooks--update.sample: use hash-agnostic zero OID

From: Denton Liu <liu.denton@gmail.com>
Date: Sep 23, 2020, 09:38 UTC
Message-ID: <784135549f2fd23a5135cb2b6c2c5ba525885814.1600853895.git.liu.denton@gmail.com>
In-Reply-To: <cover.1600853895.git.liu.denton@gmail.com>

The update sample hook has the zero OID hardcoded as 40 zeros. However, with the introduction of SHA-256 support, this assumption no longer holds true. Replace the hardcoded $z40 with a call to

	git hash-object --stdin </dev/null | tr '[0-9a-f]' '0'

so the sample hook becomes hash-agnostic.

Signed-off-by: Denton Liu <liu.denton@gmail.com>
---
 templates/hooks--update.sample | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/templates/hooks--update.sample b/templates/hooks--update.sample
index 5014c4b31c..c4d426bc6e 100755
--- a/templates/hooks--update.sample
+++ b/templates/hooks--update.sample
@@ -60,7 +60,7 @@ esac
 
 # --- Check types
 # if $newrev is 0000...0000, it's a commit to delete a ref.
-zero="0000000000000000000000000000000000000000"
+zero=$(git hash-object --stdin </dev/null | tr '[0-9a-f]' '0')
 if [ "$newrev" = "$zero" ]; then
 	newrev_type=delete
 else

-- 
2.28.0.760.g8d73e04208