$ git clone -n https://gitee.com/cobratoxin/gstreamer1-plugins-bad-free.git /var/lib/mock/dist-an8.7-build-275635-64300/root/chroot_tmpdir/scmroot/gstreamer1-plugins-bad-free
Cloning into '/var/lib/mock/dist-an8.7-build-275635-64300/root/chroot_tmpdir/scmroot/gstreamer1-plugins-bad-free'...
$ git fetch origin acbf5c1b8c8a8459ecd519aa7c74a3d6d7b8ce03:KOJI_FETCH_HEAD
From https://gitee.com/cobratoxin/gstreamer1-plugins-bad-free
 * [new ref]         acbf5c1b8c8a8459ecd519aa7c74a3d6d7b8ce03 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at acbf5c1 Rebuild