$ git clone -n https://src.fedoraproject.org/rpms/perl-MIME-Types.git /var/lib/mock/f45-build-24606-605/root/chroot_tmpdir/scmroot/perl-MIME-Types
Cloning into '/var/lib/mock/f45-build-24606-605/root/chroot_tmpdir/scmroot/perl-MIME-Types'...
$ git fetch origin da0b04689634db51a7b2e126d91df47fbbe48bf9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-MIME-Types
 * [new ref]         da0b04689634db51a7b2e126d91df47fbbe48bf9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at da0b046 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild