$ git clone -n https://gitee.com/wenyuzifang/btrfs-progs.git /var/lib/mock/dist-an23-build-466307-73955/root/chroot_tmpdir/scmroot/btrfs-progs
Cloning into '/var/lib/mock/dist-an23-build-466307-73955/root/chroot_tmpdir/scmroot/btrfs-progs'...
$ git fetch origin 4dc6de36a08353c2dc219b8db02f800517a10a25:KOJI_FETCH_HEAD
From https://gitee.com/wenyuzifang/btrfs-progs
 * [new ref]         4dc6de36a08353c2dc219b8db02f800517a10a25 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4dc6de3 Update code from upstream