$ git clone -n https://src.fedoraproject.org/rpms/xmlgraphics-commons.git /var/lib/mock/f40-build-2145310-50880/root/chroot_tmpdir/scmroot/xmlgraphics-commons
Cloning into '/var/lib/mock/f40-build-2145310-50880/root/chroot_tmpdir/scmroot/xmlgraphics-commons'...
$ git fetch origin 0a4121e22a4c648a662a1da2be46bdaf6c6303e2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xmlgraphics-commons
 * [new ref]         0a4121e22a4c648a662a1da2be46bdaf6c6303e2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0a4121e 2.9