## Changes
- Added a `requiresShell` function to detect when a command contains
shell operators
- In the `exec` function, enabled the `shell: true` option if shell
operators are present
## Why This Is Necessary
See the discussion in this issue comment:
https://github.com/openai/codex/issues/320#issuecomment-2816528014
## Code Explanation
The `requiresShell` function parses the command arguments and checks for
any shell‑specific operators. If it finds shell operators, it adds the
`shell: true` option when running the command so that it’s executed
through a shell interpreter.
This adds support for a new flag, `-w,--writable-root`, that can be
specified multiple times to _amend_ the list of folders that should be
configured as "writable roots" by the sandbox used in `full-auto` mode.
Values that are passed as relative paths will be resolved to absolute
paths.
Incidentally, this required updating a number of the `agent*.test.ts`
files: it feels like some of the setup logic across those tests could be
consolidated.
In my testing, it seems that this might be slightly out of distribution
for the model, as I had to explicitly tell it to run `apply_patch` and
that it had the permissions to write those files (initially, it just
showed me a diff and told me to apply it myself). Nevertheless, I think
this is a good starting point.
