$ git clone -n https://src.fedoraproject.org/rpms/tuba.git /var/lib/mock/f38-build-side-42-init-devel-1137917-30391/root/chroot_tmpdir/scmroot/tuba
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1137917-30391/root/chroot_tmpdir/scmroot/tuba'...
$ git fetch origin 5bd73d10a62088a0cce0bbc2adb9570cb529dbcd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tuba
 * [new ref]         5bd73d10a62088a0cce0bbc2adb9570cb529dbcd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5bd73d1 Enable spellcheck support