$ git clone -n https://src.fedoraproject.org/rpms/rubygem-activemodel-serializers-xml.git /var/lib/mock/f41-build-side-1-3133287-39685/root/chroot_tmpdir/scmroot/rubygem-activemodel-serializers-xml
Cloning into '/var/lib/mock/f41-build-side-1-3133287-39685/root/chroot_tmpdir/scmroot/rubygem-activemodel-serializers-xml'...
$ git fetch origin 5c3c7f21fe7448312665aaaf1f23125b68847f4d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-activemodel-serializers-xml
 * [new ref]         5c3c7f21fe7448312665aaaf1f23125b68847f4d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5c3c7f2 Orphaned for 6+ weeks