$ git clone -n https://src.fedoraproject.org/rpms/gstreamer1.git /var/lib/mock/f41-build-850540-165462/root/chroot_tmpdir/scmroot/gstreamer1
Cloning into '/var/lib/mock/f41-build-850540-165462/root/chroot_tmpdir/scmroot/gstreamer1'...
$ git fetch origin b931cb397afb208a66cc0b8c6be142304d0385b7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gstreamer1
 * [new ref]         b931cb397afb208a66cc0b8c6be142304d0385b7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b931cb3 1.24.8