$ git clone -n https://src.fedoraproject.org/rpms/rust-fedora.git /var/lib/mock/f39-build-1627227-39365/root/chroot_tmpdir/scmroot/rust-fedora
Cloning into '/var/lib/mock/f39-build-1627227-39365/root/chroot_tmpdir/scmroot/rust-fedora'...
$ git fetch origin 35a71809e46bfbeac23ec4ffea50b29ce85222bc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-fedora
 * [new ref]         35a71809e46bfbeac23ec4ffea50b29ce85222bc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 35a7180 Regenerate with rust2rpm v24