Merge branch 'sg/lock-file-commit-error' into maint

Cosmetic improvement to lock-file error messages.

* sg/lock-file-commit-error:
  Make error message after failing commit_lock_file() less confusing

Author: gitster

config.c

@@ -2144,7 +2144,8 @@ int git_config_set_multivar_in_file(const char *config_filename,
 	}
 
 	if (commit_lock_file(lock) < 0) {
-		error("could not commit config file %s", config_filename);
+		error("could not write config file %s: %s", config_filename,
+		      strerror(errno));
 		ret = CONFIG_NO_WRITE;
 		lock = NULL;
 		goto out_free;
@@ -2330,7 +2331,8 @@ int git_config_rename_section_in_file(const char *config_filename,
 	fclose(config_file);
 unlock_and_out:
 	if (commit_lock_file(lock) < 0)
-		ret = error("could not commit config file %s", config_filename);
+		ret = error("could not write config file %s: %s",
+			    config_filename, strerror(errno));
 out:
 	free(filename_buf);
 	return ret;

credential-store.c

@@ -64,7 +64,8 @@ static void rewrite_credential_file(const char *fn, struct credential *c,
 		print_line(extra);
 	parse_credential_file(fn, c, NULL, print_line);
 	if (commit_lock_file(&credential_lock) < 0)
-		die_errno("unable to commit credential store");
+		die_errno("unable to write credential store: %s",
+			  strerror(errno));
 }
 
 static void store_credential_file(const char *fn, struct credential *c)

fast-import.c

@@ -1821,7 +1821,7 @@ static void dump_marks(void)
 
 	dump_marks_helper(f, 0, marks);
 	if (commit_lock_file(&mark_lock)) {
-		failure |= error("Unable to commit marks file %s: %s",
+		failure |= error("Unable to write file %s: %s",
 			export_marks_file, strerror(errno));
 		return;
 	}

refs.c

@@ -4643,7 +4643,7 @@ int reflog_expire(const char *refname, const unsigned char *sha1,
 					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)",
+			status |= error("unable to write reflog %s: %s",
 					log_file, strerror(errno));
 		} else if (update && commit_ref(lock)) {
 			status |= error("couldn't set %s", lock->ref_name);