[PATCH 2/2] completion: silence pseudoref existence check

[Patrick Steinhardt <ps@pks.im>]

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In 44dbb3bf29 (completion: support pseudoref existence checks for
reftables, 2023-12-19), we have extended the Bash completion script to
support future ref backends better by using git-rev-parse(1) to check
for pseudo-ref existence. This conversion has introduced a bug, because
even though we pass `--quiet` to git-rev-parse(1) it would still output
the resolved object ID of the ref in question if it exists.

Fix this by redirecting its stdout to `/dev/null` and add a test that
catches this behaviour. Note that the test passes even without the fix
for the "files" backend because we parse pseudo refs via the filesystem
directly in that case. But the test will fail with the "reftable"
backend.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
---
 contrib/completion/git-completion.bash | 2 +-
 t/t9902-completion.sh                  | 8 ++++++++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/contrib/completion/git-completion.bash b/contrib/completion/git-completion.bash
index 8c40ade494..8872192e2b 100644
--- a/contrib/completion/git-completion.bash
+++ b/contrib/completion/git-completion.bash
@@ -146,7 +146,7 @@ __git_pseudoref_exists ()
 	if __git_eread "$__git_repo_path/HEAD" head; then
 		b="${head#ref: }"
 		if [ "$b" == "refs/heads/.invalid" ]; then
-			__git -C "$__git_repo_path" rev-parse --verify --quiet "$ref" 2>/dev/null
+			__git -C "$__git_repo_path" rev-parse --verify --quiet "$ref" >/dev/null 2>&1
 			return $?
 		fi
 	fi
diff --git a/t/t9902-completion.sh b/t/t9902-completion.sh
index 78cb93bea7..b14ae4de14 100755
--- a/t/t9902-completion.sh
+++ b/t/t9902-completion.sh
@@ -1927,6 +1927,14 @@ test_expect_success 'git checkout - --orphan with branch already provided comple
 	EOF
 '
 
+test_expect_success 'git reset completes modified files' '
+	test_commit A a.file &&
+	echo B >a.file &&
+	test_completion "git restore a." <<-\EOF
+	a.file
+	EOF
+'
+
 test_expect_success 'teardown after ref completion' '
 	git branch -d matching-branch &&
 	git tag -d matching-tag &&
-- 
2.43.GIT


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