$ git clone -n https://gitee.com/leeffo/mpv.git /var/lib/mock/dist-an8-dde-build-181037-59660/root/chroot_tmpdir/scmroot/mpv
Cloning into '/var/lib/mock/dist-an8-dde-build-181037-59660/root/chroot_tmpdir/scmroot/mpv'...
$ git fetch origin a8:KOJI_FETCH_HEAD
From https://gitee.com/leeffo/mpv
 * [new branch]      a8         -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bfdd690 rebuild