[PATCH v2 3/5] refs.c: do not die if locking fails in `delete_pseudoref()`

["Martin Ågren" <martin.agren@gmail.com>]

After taking the lock we check whether we got it and die otherwise. But
since we take the lock using `LOCK_DIE_ON_ERROR`, we would already have
died.

Considering the choice between dropping the dead code and dropping the
flag, let's go for option number three: Drop the flag, write an error
instead of dying, then return -1. This function already returns -1 for
another error, so the caller (or rather, its callers) should be able to
handle this. There is some inconsistency around how we handle errors in
this function and elsewhere in this file, but let's take this small step
towards gentle error-reporting now and leave the rest for another time.

While at it, make the lock non-static and reduce its scope. (Placing
`struct lock_file`s on the stack used to be a bad idea, because the
temp- and lockfile-machinery would keep a pointer into the struct. But
after 076aa2cbd (tempfile: auto-allocate tempfiles on heap, 2017-09-05),
we can safely have lockfiles on the stack.)

Signed-off-by: Martin Ågren <martin.agren@gmail.com>
---
 refs.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/refs.c b/refs.c
index 8c50b8b139..c006004bcd 100644
--- a/refs.c
+++ b/refs.c
@@ -689,20 +689,23 @@ static int write_pseudoref(const char *pseudoref, const struct object_id *oid,
 
 static int delete_pseudoref(const char *pseudoref, const struct object_id *old_oid)
 {
-	static struct lock_file lock;
 	const char *filename;
 
 	filename = git_path("%s", pseudoref);
 
 	if (old_oid && !is_null_oid(old_oid)) {
+		struct lock_file lock = LOCK_INIT;
 		int fd;
 		struct object_id actual_old_oid;
 
 		fd = hold_lock_file_for_update_timeout(
-				&lock, filename, LOCK_DIE_ON_ERROR,
+				&lock, filename, 0,
 				get_files_ref_lock_timeout_ms());
-		if (fd < 0)
-			die_errno(_("Could not open '%s' for writing"), filename);
+		if (fd < 0) {
+			error_errno(_("could not open '%s' for writing"),
+				    filename);
+			return -1;
+		}
 		if (read_ref(pseudoref, &actual_old_oid))
 			die("could not read ref '%s'", pseudoref);
 		if (oidcmp(&actual_old_oid, old_oid)) {
-- 
2.17.0.411.g9fd64c8e46