This exploration came out of my review of
https://github.com/openai/codex/pull/414.
`run_in_container.sh` runs Codex in a Docker container like so:
bd1c3deed9/codex-cli/scripts/run_in_container.sh (L51-L58)
But then runs `init_firewall.sh` to set up the firewall to restrict
network access.
Previously, we did this by adding `/usr/local/bin/init_firewall.sh` to
the container and adding a special rule in `/etc/sudoers.d` so the
unprivileged user (`node`) could run the privileged `init_firewall.sh`
script to open up the firewall for `api.openai.com`:
31d0d7a305/codex-cli/Dockerfile (L51-L56)
Though I believe this is unnecessary, as we can use `docker exec --user
root` from _outside_ the container to run
`/usr/local/bin/init_firewall.sh` as `root` without adding a special
case in `/etc/sudoers.d`.
This appears to work as expected, as I tested it by doing the following:
```
./codex-cli/scripts/build_container.sh
./codex-cli/scripts/run_in_container.sh 'what is the output of `curl https://www.openai.com`'
```
This was a bit funny because in some of my runs, Codex wasn't convinced
it had network access, so I had to convince it to try the `curl`
request:
As you can see, when it ran `curl -s https\://www.openai.com`, it a
connection failure, so the network policy appears to be working as
intended.
Note this PR also removes `sudo` from the `apt-get install` list in the
`Dockerfile`.
This PR makes changes in the Dockerfile to reduce the final image size.
I'm sure this can be optimized further. But I didn't want to make too
many changes at once.
Original:
```
REPOSITORY TAG IMAGE ID CREATED SIZE
codex latest c8f66942ded3 4 minutes ago 1.91GB
```
Now:
```
REPOSITORY TAG IMAGE ID CREATED SIZE
codex latest 2a6d6450609c 4 minutes ago 747MB
```
