$ git clone -n https://src.fedoraproject.org/rpms/rubygem-afm.git /var/lib/mock/f45-build-34775-691/root/chroot_tmpdir/scmroot/rubygem-afm
Cloning into '/var/lib/mock/f45-build-34775-691/root/chroot_tmpdir/scmroot/rubygem-afm'...
$ git fetch origin 5a057e45eb713b131c4c4e9c1208a8a72a719dec:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-afm
 * [new ref]         5a057e45eb713b131c4c4e9c1208a8a72a719dec -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5a057e4 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild