Function odb_source_files_write_alternate

odb/source-files.c:211–261

}

static int odb_source_files_write_alternate(struct odb_source *source,
					    const char *alternate)
{
	struct lock_file lock = LOCK_INIT;
	char *path = xstrfmt("%s/%s", source->path, "info/alternates");
	FILE *in, *out;
	int found = 0;
	int ret;

	hold_lock_file_for_update(&lock, path, LOCK_DIE_ON_ERROR);
	out = fdopen_lock_file(&lock, "w");
	if (!out) {
		ret = error_errno(_("unable to fdopen alternates lockfile"));
		goto out;
	}

	in = fopen(path, "r");
	if (in) {
		struct strbuf line = STRBUF_INIT;

		while (strbuf_getline(&line, in) != EOF) {
			if (!strcmp(alternate, line.buf)) {
				found = 1;
				break;
			}
			fprintf_or_die(out, "%s\n", line.buf);
		}

		strbuf_release(&line);
		fclose(in);
	} else if (errno != ENOENT) {
		ret = error_errno(_("unable to read alternates file"));
		goto out;
	}

	if (found) {
		rollback_lock_file(&lock);
	} else {
		fprintf_or_die(out, "%s\n", alternate);
		if (commit_lock_file(&lock)) {
			ret = error_errno(_("unable to move new alternates file into place"));
			goto out;
		}
	}

	ret = 0;

out:
	free(path);
	return ret;
}

struct odb_source_files *odb_source_files_new(struct object_database *odb,
					      const char *path,