$ git clone -n https://src.fedoraproject.org/rpms/python-dirhash.git /var/lib/mock/f45-build-30316-644/root/chroot_tmpdir/scmroot/python-dirhash
Cloning into '/var/lib/mock/f45-build-30316-644/root/chroot_tmpdir/scmroot/python-dirhash'...
$ git fetch origin 50d221ed687a4338e714504eaf4e9a73200e7ae1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-dirhash
 * [new ref]         50d221ed687a4338e714504eaf4e9a73200e7ae1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 50d221e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild