lockfile: add accessor get_lock_file_path()

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/commit.c

@@ -324,6 +324,7 @@ static const char *prepare_index(int argc, const char **argv, const char *prefix
 	struct string_list partial;
 	struct pathspec pathspec;
 	int refresh_flags = REFRESH_QUIET;
+	const char *ret;
 
 	if (is_status)
 		refresh_flags |= REFRESH_UNMERGED;
@@ -344,7 +345,7 @@ static const char *prepare_index(int argc, const char **argv, const char *prefix
 			die(_("unable to create temporary index"));
 
 		old_index_env = getenv(INDEX_ENVIRONMENT);
-		setenv(INDEX_ENVIRONMENT, index_lock.filename.buf, 1);
+		setenv(INDEX_ENVIRONMENT, get_lock_file_path(&index_lock), 1);
 
 		if (interactive_add(argc, argv, prefix, patch_interactive) != 0)
 			die(_("interactive add failed"));
@@ -355,7 +356,7 @@ static const char *prepare_index(int argc, const char **argv, const char *prefix
 			unsetenv(INDEX_ENVIRONMENT);
 
 		discard_cache();
-		read_cache_from(index_lock.filename.buf);
+		read_cache_from(get_lock_file_path(&index_lock));
 		if (update_main_cache_tree(WRITE_TREE_SILENT) == 0) {
 			if (reopen_lock_file(&index_lock) < 0)
 				die(_("unable to write index file"));
@@ -365,7 +366,7 @@ static const char *prepare_index(int argc, const char **argv, const char *prefix
 			warning(_("Failed to update main cache tree"));
 
 		commit_style = COMMIT_NORMAL;
-		return index_lock.filename.buf;
+		return get_lock_file_path(&index_lock);
 	}
 
 	/*
@@ -388,7 +389,7 @@ static const char *prepare_index(int argc, const char **argv, const char *prefix
 		if (write_locked_index(&the_index, &index_lock, CLOSE_LOCK))
 			die(_("unable to write new_index file"));
 		commit_style = COMMIT_NORMAL;
-		return index_lock.filename.buf;
+		return get_lock_file_path(&index_lock);
 	}
 
 	/*
@@ -475,9 +476,9 @@ static const char *prepare_index(int argc, const char **argv, const char *prefix
 		die(_("unable to write temporary index file"));
 
 	discard_cache();
-	read_cache_from(false_lock.filename.buf);
-
-	return false_lock.filename.buf;
+	ret = get_lock_file_path(&false_lock);
+	read_cache_from(ret);
+	return ret;
 }
 
 static int run_status(FILE *fp, const char *index_file, const char *prefix, int nowarn,

config.c

@@ -2056,9 +2056,9 @@ int git_config_set_multivar_in_file(const char *config_filename,
 			MAP_PRIVATE, in_fd, 0);
 		close(in_fd);
 
-		if (chmod(lock->filename.buf, st.st_mode & 07777) < 0) {
+		if (chmod(get_lock_file_path(lock), st.st_mode & 07777) < 0) {
 			error("chmod on %s failed: %s",
-				lock->filename.buf, strerror(errno));
+			      get_lock_file_path(lock), strerror(errno));
 			ret = CONFIG_NO_WRITE;
 			goto out_free;
 		}
@@ -2138,7 +2138,7 @@ int git_config_set_multivar_in_file(const char *config_filename,
 	return ret;
 
 write_err_out:
-	ret = write_error(lock->filename.buf);
+	ret = write_error(get_lock_file_path(lock));
 	goto out_free;
 
 }
@@ -2239,9 +2239,9 @@ int git_config_rename_section_in_file(const char *config_filename,
 
 	fstat(fileno(config_file), &st);
 
-	if (chmod(lock->filename.buf, st.st_mode & 07777) < 0) {
+	if (chmod(get_lock_file_path(lock), st.st_mode & 07777) < 0) {
 		ret = error("chmod on %s failed: %s",
-				lock->filename.buf, strerror(errno));
+			    get_lock_file_path(lock), strerror(errno));
 		goto out;
 	}
 
@@ -2262,7 +2262,7 @@ int git_config_rename_section_in_file(const char *config_filename,
 				}
 				store.baselen = strlen(new_name);
 				if (!store_write_section(out_fd, new_name)) {
-					ret = write_error(lock->filename.buf);
+					ret = write_error(get_lock_file_path(lock));
 					goto out;
 				}
 				/*
@@ -2288,7 +2288,7 @@ int git_config_rename_section_in_file(const char *config_filename,
 			continue;
 		length = strlen(output);
 		if (write_in_full(out_fd, output, length) != length) {
-			ret = write_error(lock->filename.buf);
+			ret = write_error(get_lock_file_path(lock));
 			goto out;
 		}
 	}

lockfile.c

@@ -364,6 +364,13 @@ FILE *fdopen_lock_file(struct lock_file *lk, const char *mode)
 	return lk->fp;
 }
 
+const char *get_lock_file_path(struct lock_file *lk)
+{
+	if (!lk->active)
+		die("BUG: get_lock_file_path() called for unlocked object");
+	return lk->filename.buf;
+}
+
 int get_lock_file_fd(struct lock_file *lk)
 {
 	if (!lk->active)

lockfile.h

@@ -203,6 +203,12 @@ extern NORETURN void unable_to_lock_die(const char *path, int err);
  */
 extern FILE *fdopen_lock_file(struct lock_file *lk, const char *mode);
 
+/*
+ * Return the path of the lockfile. The return value is a pointer to a
+ * field within the lock_file object and should not be freed.
+ */
+extern const char *get_lock_file_path(struct lock_file *lk);
+
 extern int get_lock_file_fd(struct lock_file *lk);
 extern FILE *get_lock_file_fp(struct lock_file *lk);
 

refs.c

@@ -3184,7 +3184,7 @@ static int write_ref_to_lockfile(struct ref_lock *lock,
 	    write_in_full(fd, &term, 1) != 1 ||
 	    close_ref(lock) < 0) {
 		int save_errno = errno;
-		error("Couldn't write %s", lock->lk->filename.buf);
+		error("Couldn't write %s", get_lock_file_path(lock->lk));
 		unlock_ref(lock);
 		errno = save_errno;
 		return -1;
@@ -4241,7 +4241,7 @@ int reflog_expire(const char *refname, const unsigned char *sha1,
 		cb.newlog = fdopen_lock_file(&reflog_lock, "w");
 		if (!cb.newlog) {
 			error("cannot fdopen %s (%s)",
-			      reflog_lock.filename.buf, strerror(errno));
+			      get_lock_file_path(&reflog_lock), strerror(errno));
 			goto failure;
 		}
 	}
@@ -4271,7 +4271,7 @@ int reflog_expire(const char *refname, const unsigned char *sha1,
 			    write_str_in_full(get_lock_file_fd(lock->lk), "\n") != 1 ||
 			    close_ref(lock) < 0)) {
 			status |= error("couldn't write %s",
-					lock->lk->filename.buf);
+					get_lock_file_path(lock->lk));
 			rollback_lock_file(&reflog_lock);
 		} else if (commit_lock_file(&reflog_lock)) {
 			status |= error("unable to commit reflog '%s' (%s)",

shallow.c

@@ -267,8 +267,8 @@ void setup_alternate_shallow(struct lock_file *shallow_lock,
 	if (write_shallow_commits(&sb, 0, extra)) {
 		if (write_in_full(fd, sb.buf, sb.len) != sb.len)
 			die_errno("failed to write to %s",
-				  shallow_lock->filename.buf);
-		*alternate_shallow_file = shallow_lock->filename.buf;
+				  get_lock_file_path(shallow_lock));
+		*alternate_shallow_file = get_lock_file_path(shallow_lock);
 	} else
 		/*
 		 * is_repository_shallow() sees empty string as "no
@@ -314,7 +314,7 @@ void prune_shallow(int show_only)
 	if (write_shallow_commits_1(&sb, 0, NULL, SEEN_ONLY)) {
 		if (write_in_full(fd, sb.buf, sb.len) != sb.len)
 			die_errno("failed to write to %s",
-				  shallow_lock.filename.buf);
+				  get_lock_file_path(&shallow_lock));
 		commit_lock_file(&shallow_lock);
 	} else {
 		unlink(git_path("shallow"));