1 files changed, 41 insertions, 0 deletions
diff --git a/builtin-pack-refs.c b/builtin-pack-refs.c
new file mode 100644
index 0000000000..0f5d827c25
--- /dev/null
+++ b/builtin-pack-refs.c
@@ -0,0 +1,41 @@
+#include "cache.h"
+#include "refs.h"
+
+static FILE *refs_file;
+static const char *result_path, *lock_path;
+
+static void remove_lock_file(void)
+{
+	if (lock_path)
+		unlink(lock_path);
+}
+
+static int handle_one_ref(const char *path, const unsigned char *sha1)
+{
+	fprintf(refs_file, "%s %s\n", sha1_to_hex(sha1), path);
+	return 0;
+}
+
+int cmd_pack_refs(int argc, const char **argv, const char *prefix)
+{
+	int fd;
+
+	result_path = xstrdup(git_path("packed-refs"));
+	lock_path = xstrdup(mkpath("%s.lock", result_path));
+
+	fd = open(lock_path, O_CREAT | O_EXCL | O_WRONLY, 0666);
+	if (fd < 0)
+		die("unable to create new ref-pack file (%s)", strerror(errno));
+	atexit(remove_lock_file);
+
+	refs_file = fdopen(fd, "w");
+	if (!refs_file)
+		die("unable to create ref-pack file structure (%s)", strerror(errno));
+	for_each_ref(handle_one_ref);
+	fsync(fd);
+	fclose(refs_file);
+	if (rename(lock_path, result_path) < 0)
+		die("unable to overwrite old ref-pack file (%s)", strerror(errno));
+	lock_path = NULL;
+	return 0;
+}