$ git clone -n https://src.fedoraproject.org/rpms/libaribcaption.git /var/lib/mock/f41-build-850246-165181/root/chroot_tmpdir/scmroot/libaribcaption
Cloning into '/var/lib/mock/f41-build-850246-165181/root/chroot_tmpdir/scmroot/libaribcaption'...
$ git fetch origin 5cd09df9406b215033db1829447740f18c09cdb4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libaribcaption
 * [new ref]         5cd09df9406b215033db1829447740f18c09cdb4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5cd09df First import