$ git clone -n https://src.fedoraproject.org/rpms/mcomix3.git /var/lib/mock/f45-build-18165-510/root/chroot_tmpdir/scmroot/mcomix3
Cloning into '/var/lib/mock/f45-build-18165-510/root/chroot_tmpdir/scmroot/mcomix3'...
$ git fetch origin 454df26a92a2430164f041e9602d319acf179842:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mcomix3
 * [new ref]         454df26a92a2430164f041e9602d319acf179842 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 454df26 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild