$ git clone -n https://src.fedoraproject.org/rpms/diffutils.git /var/lib/mock/f40-build-2276647-55174/root/chroot_tmpdir/scmroot/diffutils
Cloning into '/var/lib/mock/f40-build-2276647-55174/root/chroot_tmpdir/scmroot/diffutils'...
$ git fetch origin 22cf0d6a15bdb09fb8731a468b66d44c73ea2113:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/diffutils
 * [new ref]         22cf0d6a15bdb09fb8731a468b66d44c73ea2113 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 22cf0d6 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild