$ git clone -n https://src.fedoraproject.org/rpms/mu.git /var/lib/mock/f42-build-3281187-41341/root/chroot_tmpdir/scmroot/mu
Cloning into '/var/lib/mock/f42-build-3281187-41341/root/chroot_tmpdir/scmroot/mu'...
$ git fetch origin 48124df15f80c564f561cf7c7a519f9a7de52779:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mu
 * [new ref]         48124df15f80c564f561cf7c7a519f9a7de52779 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 48124df Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild