4f2918dd7f
## Summary - reserve an explicit opaque `desktop` namespace in `ConfigToml` - expose `desktop` directly in the app-server v2 `config/read` response - keep `config/value/write` and `config/batchWrite` as the only mutation seam for paths like `desktop.someKey` - regenerate the config/app-server schema outputs and document the new contract ## Why The desktop settings work wants one durable, user-editable home for app-owned preferences in `~/.codex/config.toml`, without forcing Rust to model every individual desktop setting key. This PR is only the enabling Rust/app-server layer. It gives the Electron app a first-class config namespace it can read and write through the existing config APIs, while leaving the actual desktop migration to the app PR. ## Behavior and design notes - **Opaque but explicit:** `desktop` is first-class at the typed config root, while its children remain app-owned and open-ended. - **Strict validation still works:** arbitrary nested `desktop.*` keys are accepted instead of being rejected as unknown config. - **Existing config APIs stay the seam:** `config/read` returns the bag, and dotted writes such as `desktop.someKey` continue to flow through `config/value/write` / `config/batchWrite` rather than a bespoke RPC. - **No new consumer behavior:** Core/TUI do not start depending on desktop preferences. This only preserves and exposes the namespace for callers that intentionally use it. - **Same persistence machinery:** hand-edited `config.toml` keeps using the existing TOML edit/write path; this PR does not introduce a second serializer or side channel. - **TOML-friendly values:** the namespace is intended for ordinary JSON-shaped setting values that map cleanly into TOML: strings, numbers, booleans, arrays, and nested object/table values. This PR does not add special handling for TOML-only edge cases such as datetimes. ## Layering semantics Reads keep using the ordinary effective config pipeline, so `desktop` participates in the same layered `config/read` behavior as the rest of `ConfigToml`. Writes still target user config through the existing config service. ## Why this is the shape The alternative would be teaching Rust about each desktop setting as it is added. That would make ordinary app preferences into a cross-repo change, which is exactly the coupling we want to avoid. This keeps the contract small: 1. Rust owns one opaque `desktop` namespace in `config.toml`. 2. The desktop app owns the schema and meaning of individual keys inside it. 3. The existing config APIs remain the transport and mutation surface. That is the piece the desktop settings PR needs in order to move forward cleanly. ## Verification - `cargo test -p codex-config strict_config_accepts_opaque_desktop_keys` - `cargo test -p codex-core desktop_toml_round_trips_opaque_nested_values` - `cargo test -p codex-core config_schema_matches_fixture` - `cargo test -p codex-app-server-protocol` - `cargo test -p codex-app-server --test all desktop_settings`
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 bundled codex-resources/bwrap
binary shipped with Codex 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.