$ git clone -n https://src.fedoraproject.org/rpms/dtkcore.git /var/lib/mock/f42-build-side-1-3568060-46743/root/chroot_tmpdir/scmroot/dtkcore
Cloning into '/var/lib/mock/f42-build-side-1-3568060-46743/root/chroot_tmpdir/scmroot/dtkcore'...
$ git fetch origin 80d687b717cb180136cb9b8f7d7810eb2b3a783a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/dtkcore
 * [new ref]         80d687b717cb180136cb9b8f7d7810eb2b3a783a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 80d687b Rebuild (qt5)