treewide: prefer lockfiles on the stack

There is no longer any need to allocate and leak a `struct lock_file`.
The previous patch addressed an instance where we needed a minor tweak
alongside the trivial changes.

Deal with the remaining instances where we allocate and leak a struct
within a single function. Change them to have the `struct lock_file` on
the stack instead.

These instances were identified by running `git grep "^\s*struct
lock_file\s*\*"`.

Signed-off-by: Martin Ågren <martin.agren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 8 insertions, 9 deletions

diff --git a/config.c b/config.c
index 345d78c..0e61e86 100644
--- a/config.c
+++ b/config.c
@@ -2748,7 +2748,7 @@ int git_config_rename_section_in_file(const char *config_filename,
 {
 	int ret = 0, remove = 0;
 	char *filename_buf = NULL;
-	struct lock_file *lock;
+	struct lock_file lock = LOCK_INIT;
 	int out_fd;
 	char buf[1024];
 	FILE *config_file = NULL;
@@ -2762,8 +2762,7 @@ int git_config_rename_section_in_file(const char *config_filename,
 	if (!config_filename)
 		config_filename = filename_buf = git_pathdup("config");
 
-	lock = xcalloc(1, sizeof(struct lock_file));
-	out_fd = hold_lock_file_for_update(lock, config_filename, 0);
+	out_fd = hold_lock_file_for_update(&lock, config_filename, 0);
 	if (out_fd < 0) {
 		ret = error("could not lock config file %s", config_filename);
 		goto out;
@@ -2782,9 +2781,9 @@ int git_config_rename_section_in_file(const char *config_filename,
 		goto out;
 	}
 
-	if (chmod(get_lock_file_path(lock), st.st_mode & 07777) < 0) {
+	if (chmod(get_lock_file_path(&lock), st.st_mode & 07777) < 0) {
 		ret = error_errno("chmod on %s failed",
-				  get_lock_file_path(lock));
+				  get_lock_file_path(&lock));
 		goto out;
 	}
 
@@ -2805,7 +2804,7 @@ int git_config_rename_section_in_file(const char *config_filename,
 				}
 				store.baselen = strlen(new_name);
 				if (write_section(out_fd, new_name) < 0) {
-					ret = write_error(get_lock_file_path(lock));
+					ret = write_error(get_lock_file_path(&lock));
 					goto out;
 				}
 				/*
@@ -2831,20 +2830,20 @@ int git_config_rename_section_in_file(const char *config_filename,
 			continue;
 		length = strlen(output);
 		if (write_in_full(out_fd, output, length) < 0) {
-			ret = write_error(get_lock_file_path(lock));
+			ret = write_error(get_lock_file_path(&lock));
 			goto out;
 		}
 	}
 	fclose(config_file);
 	config_file = NULL;
 commit_and_out:
-	if (commit_lock_file(lock) < 0)
+	if (commit_lock_file(&lock) < 0)
 		ret = error_errno("could not write config file %s",
 				  config_filename);
 out:
 	if (config_file)
 		fclose(config_file);
-	rollback_lock_file(lock);
+	rollback_lock_file(&lock);
 out_no_rollback:
 	free(filename_buf);
 	return ret;