$ git clone -n https://src.fedoraproject.org/rpms/dtkcore.git /var/lib/mock/f42-build-3272998-41309/root/chroot_tmpdir/scmroot/dtkcore
Cloning into '/var/lib/mock/f42-build-3272998-41309/root/chroot_tmpdir/scmroot/dtkcore'...
$ git fetch origin ed432e5169a21a4f75ef547d8d0b6e59fa455480:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/dtkcore
 * [new ref]         ed432e5169a21a4f75ef547d8d0b6e59fa455480 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ed432e5 5.7.7