$ git clone -n https://src.fedoraproject.org/rpms/mu.git /var/lib/mock/f38-build-side-42-init-devel-707435-27192/root/chroot_tmpdir/scmroot/mu
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-707435-27192/root/chroot_tmpdir/scmroot/mu'...
$ git fetch origin d22a44763acbe585f4b63626540dda33e3e08cfe:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mu
 * [new ref]         d22a44763acbe585f4b63626540dda33e3e08cfe -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d22a447 Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild