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submodule summary: Don't barf when invoked in an empty repo

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When invoking "git submodule summary" in an empty repo (which can be
indirectly done by setting status.submodulesummary = true), it currently
emits an error message (via "git diff-index") since HEAD points to an
unborn branch.

This patch adds handling of the HEAD-points-to-unborn-branch special case,
so that "git submodule summary" no longer emits this error message.

The patch also adds a test case that verifies the fix.

Suggested-by: Jeff King <peff@peff.net>
Signed-off-by: Johan Herland <johan@herland.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Johan Herland 2010-02-16 11:21:14 +01:00 committed by Junio C Hamano
parent e923eaeb90
commit 3deea89c5f
2 changed files with 12 additions and 2 deletions
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7
git-submodule.sh
View file

@ -553,12 +553,15 @@ cmd_summary() {
test $summary_limit = 0 && return
if rev=$(git rev-parse -q --verify "$1^0")
if rev=$(git rev-parse -q --verify --default HEAD ${1+"$1"})
then
head=$rev
shift
elif test -z "$1" -o "$1" = "HEAD"
then
return
else
head=HEAD
head="HEAD"
fi
if [ -n "$files" ]

7
t/t7401-submodule-summary.sh
View file

@ -227,4 +227,11 @@ test_expect_success 'fail when using --files together with --cached' "
test_must_fail git submodule summary --files --cached
"
test_expect_success 'should not fail in an empty repo' "
git init xyzzy &&
cd xyzzy &&
git submodule summary >output 2>&1 &&
test_cmp output /dev/null
"
test_done