$ git clone -n https://src.fedoraproject.org/rpms/rear.git /var/lib/mock/f40-build-771027-125907/root/chroot_tmpdir/scmroot/rear
Cloning into '/var/lib/mock/f40-build-771027-125907/root/chroot_tmpdir/scmroot/rear'...
$ git fetch origin f0866e7568f7e125e0a912955db79b1f23c3fad8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rear
 * [new ref]         f0866e7568f7e125e0a912955db79b1f23c3fad8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f0866e7 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild