$ git clone -n https://src.fedoraproject.org/rpms/xu4.git /var/lib/mock/f40-build-763326-122469/root/chroot_tmpdir/scmroot/xu4
Cloning into '/var/lib/mock/f40-build-763326-122469/root/chroot_tmpdir/scmroot/xu4'...
$ git fetch origin bcdc79355fcc0a530c3a3c6f2dca6bba180f2dc4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xu4
 * [new ref]         bcdc79355fcc0a530c3a3c6f2dca6bba180f2dc4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bcdc793 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild