$ git clone -n https://src.fedoraproject.org/rpms/mu.git /var/lib/mock/f40-build-2387871-60497/root/chroot_tmpdir/scmroot/mu
Cloning into '/var/lib/mock/f40-build-2387871-60497/root/chroot_tmpdir/scmroot/mu'...
$ git fetch origin bd37c39b22f7c4174291909e935de46cfbd377b1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mu
 * [new ref]         bd37c39b22f7c4174291909e935de46cfbd377b1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bd37c39 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild