$ git clone -n https://src.fedoraproject.org/rpms/libdmx.git /var/lib/mock/f45-build-16067-481/root/chroot_tmpdir/scmroot/libdmx
Cloning into '/var/lib/mock/f45-build-16067-481/root/chroot_tmpdir/scmroot/libdmx'...
$ git fetch origin 896daad15c168172a66e934c308e13c75f4e4be0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libdmx
 * [new ref]         896daad15c168172a66e934c308e13c75f4e4be0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 896daad Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild