$ git clone -n https://src.fedoraproject.org/rpms/rust-assert-json-diff.git /var/lib/mock/f40-build-2091488-50230/root/chroot_tmpdir/scmroot/rust-assert-json-diff
Cloning into '/var/lib/mock/f40-build-2091488-50230/root/chroot_tmpdir/scmroot/rust-assert-json-diff'...
$ git fetch origin 4821e40d6383a6f2a9bae3f437926bc27833f49a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-assert-json-diff
 * [new ref]         4821e40d6383a6f2a9bae3f437926bc27833f49a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4821e40 Regenerate with rust2rpm v24