$ git clone -n https://src.fedoraproject.org/rpms/libobjc2.git /var/lib/mock/f38-build-718572-96741/root/chroot_tmpdir/scmroot/libobjc2
Cloning into '/var/lib/mock/f38-build-718572-96741/root/chroot_tmpdir/scmroot/libobjc2'...
$ git fetch origin fb8061cd96b7eec4affef39632e30e280fd016fd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libobjc2
 * [new ref]         fb8061cd96b7eec4affef39632e30e280fd016fd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fb8061c Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild