$ git clone -n https://src.fedoraproject.org/rpms/cheese.git /var/lib/mock/f41-build-858292-168340/root/chroot_tmpdir/scmroot/cheese
Cloning into '/var/lib/mock/f41-build-858292-168340/root/chroot_tmpdir/scmroot/cheese'...
$ git fetch origin 7171ff3ec119c23459c7ef24d8d1a1f0b97962b0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cheese
 * [new ref]         7171ff3ec119c23459c7ef24d8d1a1f0b97962b0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7171ff3 Backport MR #73 to fix a crash on startup with recent json-glib