$ git clone -n https://src.fedoraproject.org/rpms/dhex.git /var/lib/mock/f45-build-7479-364/root/chroot_tmpdir/scmroot/dhex
Cloning into '/var/lib/mock/f45-build-7479-364/root/chroot_tmpdir/scmroot/dhex'...
$ git fetch origin 1fb91813b2f2e28fbc37a638df07d6edf9279ac0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/dhex
 * [new ref]         1fb91813b2f2e28fbc37a638df07d6edf9279ac0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1fb9181 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild