$ git clone -n https://src.fedoraproject.org/rpms/arts.git /var/lib/mock/f40-build-2217056-52535/root/chroot_tmpdir/scmroot/arts
Cloning into '/var/lib/mock/f40-build-2217056-52535/root/chroot_tmpdir/scmroot/arts'...
$ git fetch origin 0a49933af854b425c9f0df5b676015096334de75:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/arts
 * [new ref]         0a49933af854b425c9f0df5b676015096334de75 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0a49933 Update C99 patch