$ git clone -n https://src.fedoraproject.org/rpms/file-roller.git /var/lib/mock/f42-build-side-1-3588880-46951/root/chroot_tmpdir/scmroot/file-roller
Cloning into '/var/lib/mock/f42-build-side-1-3588880-46951/root/chroot_tmpdir/scmroot/file-roller'...
$ git fetch origin 0e0ab7c54a807c7effd5d66a83772de783f84591:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/file-roller
 * [new ref]         0e0ab7c54a807c7effd5d66a83772de783f84591 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0e0ab7c Update to 44.5