[PATCH] read-cache: report lock error when refreshing index

From

Han Young <hanyang.tony@bytedance.com>

Date

Jul 1, 2025, 11:57 UTC

Message-ID

<20250701115719.85226-1-hanyang.tony@bytedance.com>

In the repo_refresh_and_write_index of read-cache.c, we return -1 to
indicate that writing the index to disk failed.
However, callers do not use this information. Commands such as stash print
  "could not write index"
and then exit, which does not help to discover the exact problem.

Signed-off-by: Han Young <hanyang.tony@bytedance.com>
---
 read-cache.c     |  2 +-
 t/t3903-stash.sh | 15 +++------------
 2 files changed, 4 insertions(+), 13 deletions(-)

diff --git a/read-cache.c b/read-cache.c
index c0bb760ad..50e842bfa 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -1456,7 +1456,7 @@ int repo_refresh_and_write_index(struct repository *repo,
 	struct lock_file lock_file = LOCK_INIT;
 	int fd, ret = 0;
 
-	fd = repo_hold_locked_index(repo, &lock_file, 0);
+	fd = repo_hold_locked_index(repo, &lock_file, gentle ? 0 : LOCK_REPORT_ON_ERROR);
 	if (!gentle && fd < 0)
 		return -1;
 	if (refresh_index(repo->index, refresh_flags, pathspec, seen, header_msg))
diff --git a/t/t3903-stash.sh b/t/t3903-stash.sh
index 35b85c790..39098ade4 100755
--- a/t/t3903-stash.sh
+++ b/t/t3903-stash.sh
@@ -1571,11 +1571,8 @@ test_expect_success 'stash create reports a locked index' '
 		echo change >A.file &&
 		touch .git/index.lock &&
 
-		cat >expect <<-EOF &&
-		error: could not write index
-		EOF
 		test_must_fail git stash create 2>err &&
-		test_cmp expect err
+		test_grep "error: Unable to create '.*index.lock'" err
 	)
 '
 
@@ -1588,11 +1585,8 @@ test_expect_success 'stash push reports a locked index' '
 		echo change >A.file &&
 		touch .git/index.lock &&
 
-		cat >expect <<-EOF &&
-		error: could not write index
-		EOF
 		test_must_fail git stash push 2>err &&
-		test_cmp expect err
+		test_grep "error: Unable to create '.*index.lock'" err
 	)
 '
 
@@ -1606,11 +1600,8 @@ test_expect_success 'stash apply reports a locked index' '
 		git stash push &&
 		touch .git/index.lock &&
 
-		cat >expect <<-EOF &&
-		error: could not write index
-		EOF
 		test_must_fail git stash apply 2>err &&
-		test_cmp expect err
+		test_grep "error: Unable to create '.*index.lock'" err
 	)
 '
 

-- 
2.50.0