$ git clone -n https://src.fedoraproject.org/rpms/compat-guile18.git /var/lib/mock/f40-build-2650053-66871/root/chroot_tmpdir/scmroot/compat-guile18
Cloning into '/var/lib/mock/f40-build-2650053-66871/root/chroot_tmpdir/scmroot/compat-guile18'...
$ git fetch origin bfc95bcae4bd7be7b77df4b394b7618c9fbc6e50:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/compat-guile18
 * [new ref]         bfc95bcae4bd7be7b77df4b394b7618c9fbc6e50 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bfc95bc Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild