$ git clone -n https://src.fedoraproject.org/rpms/capnproto.git /var/lib/mock/f40-build-789849-136078/root/chroot_tmpdir/scmroot/capnproto
Cloning into '/var/lib/mock/f40-build-789849-136078/root/chroot_tmpdir/scmroot/capnproto'...
$ git fetch origin 18584a70a1cdc6d2cc84a51dc2b3b4289f5c3ad6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/capnproto
 * [new ref]         18584a70a1cdc6d2cc84a51dc2b3b4289f5c3ad6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 18584a7 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild