$ git clone -n https://src.fedoraproject.org/rpms/libultrahdr.git /var/lib/mock/f45-build-17126-496/root/chroot_tmpdir/scmroot/libultrahdr
Cloning into '/var/lib/mock/f45-build-17126-496/root/chroot_tmpdir/scmroot/libultrahdr'...
$ git fetch origin 2918deee1fad899321c90321903a54a651ff6001:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libultrahdr
 * [new ref]         2918deee1fad899321c90321903a54a651ff6001 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2918dee Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild