$ git clone -n https://src.fedoraproject.org/rpms/btbuilder.git /var/lib/mock/f42-build-882136-184162/root/chroot_tmpdir/scmroot/btbuilder
Cloning into '/var/lib/mock/f42-build-882136-184162/root/chroot_tmpdir/scmroot/btbuilder'...
$ git fetch origin 564c1b863fabadca0027017f8b0f5ee9c32cb6f4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/btbuilder
 * [new ref]         564c1b863fabadca0027017f8b0f5ee9c32cb6f4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 564c1b8 Rebuilt for https://fedoraproject.org/wiki/Fedora_41_Mass_Rebuild