$ git clone -n https://src.fedoraproject.org/rpms/libXdmcp.git /var/lib/mock/f45-build-15776-479/root/chroot_tmpdir/scmroot/libXdmcp
Cloning into '/var/lib/mock/f45-build-15776-479/root/chroot_tmpdir/scmroot/libXdmcp'...
$ git fetch origin c17f8837d3a11c24b1dd6e693a30ddf0de452549:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libXdmcp
 * [new ref]         c17f8837d3a11c24b1dd6e693a30ddf0de452549 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c17f883 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild