$ git clone -n https://src.fedoraproject.org/rpms/tinygo.git /var/lib/mock/f38-build-side-42-init-devel-1037485-29747/root/chroot_tmpdir/scmroot/tinygo
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1037485-29747/root/chroot_tmpdir/scmroot/tinygo'...
$ git fetch origin 35a3896d93ed10089a08a80260e8bb043ff97b7d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tinygo
 * [new ref]         35a3896d93ed10089a08a80260e8bb043ff97b7d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 35a3896 Update to latest version (#2169260)