5597925155
## Why
The explicit profile path from #20117 is meant for standalone testing,
but it still inherited the
shell cwd and all managed requirements implicitly. The pre-existing
launcher path even called out
that it did not support a separate cwd yet in
[`debug_sandbox.rs`](509453f688/codex-rs/cli/src/debug_sandbox.rs (L174-L179)).
For a standalone command, the useful default is to let the caller choose
the project directory being
tested and to avoid administrator-provided constraints unless the caller
explicitly wants to test
those too.
## What changed
- Add explicit-profile-only `-C/--cd DIR`, and use that cwd for both
profile resolution and command
execution.
- Add explicit-profile-only `--include-managed-config`.
- Make explicit profile mode skip managed requirement sources by
default, including cloud
requirements, MDM requirements, `/etc/codex/requirements.toml`, and the
legacy managed-config
requirements projection.
- Preserve all existing invocations outside the explicit-profile path.
## Stack
1. #20117 `sandbox-ui-profile`
2. #20118 `sandbox-ui-config` --> this PR
Both PRs are additive. Replay JSON is intentionally deferred to a
follow-up design pass.
## Tests ran
- `cargo test -p codex-cli debug_sandbox`
- `cargo test -p codex-cli sandbox_macos_`
- `cargo test -p codex-core
load_config_layers_can_ignore_managed_requirements`
- `cargo test -p codex-core
load_config_layers_includes_cloud_requirements`
- macOS branch-binary smoke on the rebased top of stack: `-C` changed
execution cwd, explicit
profile mode omitted managed proxy env under `env -i`, and
`--include-managed-config` restored it.
- Linux devbox branch-binary smoke on the rebased top of stack: `-C`
changed execution cwd for
built-in and user-defined explicit profiles.
codex-core
This crate implements the business logic for Codex. It is designed to be used by the various Codex UIs written in Rust.
Dependencies
Note that codex-core makes some assumptions about certain helper utilities being available in the environment. Currently, this support matrix is:
macOS
Expects /usr/bin/sandbox-exec to be present.
When using the workspace-write sandbox policy, the Seatbelt profile allows
writes under the configured writable roots while keeping .git (directory or
pointer file), the resolved gitdir: target, and .codex read-only.
Network access and filesystem read/write roots are controlled by
SandboxPolicy. Seatbelt consumes the resolved policy and enforces it.
Seatbelt also keeps the legacy default preferences read access
(user-preference-read) needed for cfprefs-backed macOS behavior.
Linux
Expects the binary containing codex-core to run the equivalent of codex sandbox linux (legacy alias: codex debug landlock) when arg0 is codex-linux-sandbox. See the codex-arg0 crate for details.
Legacy SandboxPolicy / sandbox_mode configs are still supported on Linux.
They can continue to use the legacy Landlock path when the split filesystem
policy is sandbox-equivalent to the legacy model after cwd resolution.
Split filesystem policies that need direct FileSystemSandboxPolicy
enforcement, such as read-only or denied carveouts under a broader writable
root, automatically route through bubblewrap. The legacy Landlock path is used
only when the split filesystem policy round-trips through the legacy
SandboxPolicy model without changing semantics. That includes overlapping
cases like /repo = write, /repo/a = none, /repo/a/b = write, where the
more specific writable child must reopen under a denied parent.
The Linux sandbox helper prefers the first bwrap found on PATH outside the
current working directory whenever it is available. If bwrap is present but
too old to support --argv0, the helper keeps using system bubblewrap and
switches to a no---argv0 compatibility path for the inner re-exec. If
bwrap is missing, it falls back to the vendored bubblewrap path compiled into
the binary and Codex surfaces a startup warning through its normal notification
path instead of printing directly from the sandbox helper. Codex also surfaces
a startup warning when bubblewrap cannot create user namespaces. WSL2 uses the
normal Linux bubblewrap path. WSL1 is not supported for bubblewrap sandboxing
because it cannot create the required user namespaces, so Codex rejects
sandboxed shell commands that would enter the bubblewrap path before invoking
bwrap.
Windows
Legacy SandboxPolicy / sandbox_mode configs are still supported on
Windows. Legacy read-only and workspace-write policies imply full
filesystem read access; exact readable roots are represented by split
filesystem policies instead.
The elevated Windows sandbox also supports:
- legacy
ReadOnlyandWorkspaceWritebehavior - split filesystem policies that need exact readable roots, exact writable roots, or extra read-only carveouts under writable roots
- backend-managed system read roots required for basic execution, such as
C:\Windows,C:\Program Files,C:\Program Files (x86), andC:\ProgramData, when a split filesystem policy requests platform defaults
The unelevated restricted-token backend still supports the legacy full-read
Windows model for legacy ReadOnly and WorkspaceWrite behavior. It also
supports a narrow split-filesystem subset: full-read split policies whose
writable roots still match the legacy WorkspaceWrite root set, but add extra
read-only carveouts under those writable roots.
New [permissions] / split filesystem policies remain supported on Windows
only when they can be enforced directly by the selected Windows backend or
round-trip through the legacy SandboxPolicy model without changing semantics.
Policies that would require direct explicit unreadable carveouts (none) or
reopened writable descendants under read-only carveouts still fail closed
instead of running with weaker enforcement.
All Platforms
Expects the binary containing codex-core to simulate the virtual
apply_patch CLI when arg1 is --codex-run-as-apply-patch. See the
codex-arg0 crate for details.