$ git clone -n https://gitee.com/mgb01105731/gstreamer1-plugins-base_4.git /var/lib/mock/dist-an23-build-441457-73164/root/chroot_tmpdir/scmroot/gstreamer1-plugins-base_4
Cloning into '/var/lib/mock/dist-an23-build-441457-73164/root/chroot_tmpdir/scmroot/gstreamer1-plugins-base_4'...
$ git fetch origin 103529d1b7f530b2e5acf9534e043a4a8a9dc4cd:KOJI_FETCH_HEAD
From https://gitee.com/mgb01105731/gstreamer1-plugins-base_4
 * [new ref]         103529d1b7f530b2e5acf9534e043a4a8a9dc4cd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 103529d redbuild for libtheora