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submodule: make zero-oid comparison hash function agnostic 

With SHA-256, the length of the all-zeros object ID is longer.  Add a
function to git-submodule.sh to check if a full hex object ID is the
all-zeros value, and use it to check the output we're parsing from git
diff-files or diff-index.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
brian m. carlson 2018-10-15 00:02:01 +00:00 committed by Junio C Hamano
parent eccb5a5f3d
commit dda6346877
1 changed files with 6 additions and 1 deletions
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7
git-submodule.sh
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@ -82,6 +82,11 @@ isnumber()
n=$(($1 + 0)) 2>/dev/null && test "$n" = "$1"
}
# Given a full hex object ID, is this the zero OID?
is_zero_oid () {
echo "$1" | sane_egrep '^0+$' >/dev/null 2>&1
}
# Sanitize the local git environment for use within a submodule. We
# can't simply use clear_local_git_env since we want to preserve some
# of the settings from GIT_CONFIG_PARAMETERS.
@ -780,7 +785,7 @@ cmd_summary() {
while read -r mod_src mod_dst sha1_src sha1_dst status name
do
if test -z "$cached" &&
test $sha1_dst = 0000000000000000000000000000000000000000
is_zero_oid $sha1_dst
then
case "$mod_dst" in
160000)