$ git clone -n https://src.fedoraproject.org/rpms/python-gstreamer1.git /var/lib/mock/f42-build-side-1-3510420-46030/root/chroot_tmpdir/scmroot/python-gstreamer1
Cloning into '/var/lib/mock/f42-build-side-1-3510420-46030/root/chroot_tmpdir/scmroot/python-gstreamer1'...
$ git fetch origin b1f5a09efdd75f9b2c245cbdc827e7ae38a76368:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-gstreamer1
 * [new ref]         b1f5a09efdd75f9b2c245cbdc827e7ae38a76368 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b1f5a09 BR rtsp-server