$ git clone -n https://src.fedoraproject.org/rpms/python-gstreamer1.git /var/lib/mock/f42-build-side-1-3566319-46733/root/chroot_tmpdir/scmroot/python-gstreamer1
Cloning into '/var/lib/mock/f42-build-side-1-3566319-46733/root/chroot_tmpdir/scmroot/python-gstreamer1'...
$ git fetch origin 54c88f768087b6b1277385df4b5f41fb588c140b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-gstreamer1
 * [new ref]         54c88f768087b6b1277385df4b5f41fb588c140b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 54c88f7 1.26.2