$ git clone -n https://src.fedoraproject.org/rpms/xu4.git /var/lib/mock/f40-build-2343132-59862/root/chroot_tmpdir/scmroot/xu4
Cloning into '/var/lib/mock/f40-build-2343132-59862/root/chroot_tmpdir/scmroot/xu4'...
$ git fetch origin 3ee7112604a2def1be624edabe7d12bcdcf71dce:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xu4
 * [new ref]         3ee7112604a2def1be624edabe7d12bcdcf71dce -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3ee7112 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild