`bin/entrypoint.sh` now checks `DATA_DIR` before it creates anything or
changes an owner or mode: it must be `/data` or a path below it with no
`.`, `..` or empty part, and no part of it that exists, `/data`
included, may be a symbolic link. Anything else stops the start with one
message naming `DATA_DIR`. Only then does it create `DATA_DIR`, give
`/data` and everything in it to `netwatch` (`chown -R -h`, so a link in
it is not followed) and set mode 750 on `/data` and `DATA_DIR`. The
README section "Running under upaas" says which values are accepted.
Model: opus-5-5
clawbot