$ git clone -n https://src.fedoraproject.org/rpms/xvidcore.git /var/lib/mock/f40-build-788971-135468/root/chroot_tmpdir/scmroot/xvidcore
Cloning into '/var/lib/mock/f40-build-788971-135468/root/chroot_tmpdir/scmroot/xvidcore'...
$ git fetch origin 51e912f9d43d27a152b63434ebd62d48fef9f9fb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xvidcore
 * [new ref]         51e912f9d43d27a152b63434ebd62d48fef9f9fb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 51e912f Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild