$ git clone -n https://gitee.com/wenyuzifang/btrfs-progs.git /var/lib/mock/dist-an23-build-480474-74252/root/chroot_tmpdir/scmroot/btrfs-progs
Cloning into '/var/lib/mock/dist-an23-build-480474-74252/root/chroot_tmpdir/scmroot/btrfs-progs'...
$ git fetch origin 79b493f28e870cf55e698338a688e631f8905b6c:KOJI_FETCH_HEAD
From https://gitee.com/wenyuzifang/btrfs-progs
 * [new ref]         79b493f28e870cf55e698338a688e631f8905b6c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 79b493f Update code from upstream