Function log_ref_setup

refs/files-backend.c:1859–1915

* Create a reflog for a ref. If force_create = 0, only create the * reflog for certain refs (those for which should_autocreate_reflog * returns non-zero). Otherwise, create it regardless of the reference * name. If the logfile already existed or was created, return 0 and * set *logfd to the file descriptor opened for appending to the file. * If no logfile exists and we decided not to create o

 * return -1.
 */
static int log_ref_setup(struct files_ref_store *refs,
			 const char *refname, int force_create,
			 int *logfd, struct strbuf *err)
{
	enum log_refs_config log_refs_cfg = refs->log_all_ref_updates;
	struct strbuf logfile_sb = STRBUF_INIT;
	char *logfile;

	if (log_refs_cfg == LOG_REFS_UNSET)
		log_refs_cfg = is_bare_repository() ? LOG_REFS_NONE : LOG_REFS_NORMAL;

	files_reflog_path(refs, &logfile_sb, refname);
	logfile = strbuf_detach(&logfile_sb, NULL);

	if (force_create || should_autocreate_reflog(log_refs_cfg, refname)) {
		if (raceproof_create_file(logfile, open_or_create_logfile, logfd)) {
			if (errno == ENOENT)
				strbuf_addf(err, "unable to create directory for '%s': "
					    "%s", logfile, strerror(errno));
			else if (errno == EISDIR)
				strbuf_addf(err, "there are still logs under '%s'",
					    logfile);
			else
				strbuf_addf(err, "unable to append to '%s': %s",
					    logfile, strerror(errno));

			goto error;
		}
	} else {
		*logfd = open(logfile, O_APPEND | O_WRONLY);
		if (*logfd < 0) {
			if (errno == ENOENT || errno == EISDIR) {
				/*
				 * The logfile doesn't already exist,
				 * but that is not an error; it only
				 * means that we won't write log
				 * entries to it.
				 */
				;
			} else {
				strbuf_addf(err, "unable to append to '%s': %s",
					    logfile, strerror(errno));
				goto error;
			}
		}
	}

	if (*logfd >= 0)
		adjust_shared_perm(the_repository, logfile);

	free(logfile);
	return 0;

error:
	free(logfile);
	return -1;
}