chore: upgrade to Rust 1.92.0 (#8860)

**Summary**
- Upgrade Rust toolchain used by CI to 1.92.0.
- Address new clippy `derivable_impls` warnings by deriving `Default`
for enums across protocol, core, backend openapi models, and
windows-sandbox setup.
- Tidy up related test/config behavior (originator header handling, env
override cleanup) and remove a now-unused assignment in TUI/TUI2 render
layout.

**Testing**
- `just fmt`
- `just fix -p codex-tui`
- `just fix -p codex-tui2`
- `just fix -p codex-windows-sandbox`
- `cargo test -p codex-tui`
- `cargo test -p codex-tui2`
- `cargo test -p codex-windows-sandbox`
- `cargo test -p codex-core --test all`
- `cargo test -p codex-app-server --test all`
- `cargo test -p codex-mcp-server --test all`
- `cargo test --all-features`

.github/workflows/rust-ci.yml

@@ -59,7 +59,7 @@ jobs:
         working-directory: codex-rs
     steps:
       - uses: actions/checkout@v6
-      - uses: dtolnay/rust-toolchain@1.90
+      - uses: dtolnay/rust-toolchain@1.92
         with:
           components: rustfmt
       - name: cargo fmt
@@ -77,7 +77,7 @@ jobs:
         working-directory: codex-rs
     steps:
       - uses: actions/checkout@v6
-      - uses: dtolnay/rust-toolchain@1.90
+      - uses: dtolnay/rust-toolchain@1.92
       - uses: taiki-e/install-action@44c6d64aa62cd779e873306675c7a58e86d6d532 # v2
         with:
           tool: cargo-shear
@@ -177,7 +177,7 @@ jobs:
 
     steps:
       - uses: actions/checkout@v6
-      - uses: dtolnay/rust-toolchain@1.90
+      - uses: dtolnay/rust-toolchain@1.92
         with:
           targets: ${{ matrix.target }}
           components: clippy
@@ -416,7 +416,7 @@ jobs:
       - name: Install DotSlash
         uses: facebook/install-dotslash@v2
 
-      - uses: dtolnay/rust-toolchain@1.90
+      - uses: dtolnay/rust-toolchain@1.92
         with:
           targets: ${{ matrix.target }}
 

.github/workflows/rust-release.yml

@@ -80,7 +80,7 @@ jobs:
 
     steps:
       - uses: actions/checkout@v6
-      - uses: dtolnay/rust-toolchain@1.90
+      - uses: dtolnay/rust-toolchain@1.92
         with:
           targets: ${{ matrix.target }}
 

.github/workflows/sdk.yml

@@ -24,7 +24,7 @@ jobs:
           node-version: 22
           cache: pnpm
 
-      - uses: dtolnay/rust-toolchain@1.90
+      - uses: dtolnay/rust-toolchain@1.92
 
       - name: build codex
         run: cargo build --bin codex

.github/workflows/shell-tool-mcp.yml

@@ -93,7 +93,7 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v6
 
-      - uses: dtolnay/rust-toolchain@1.90
+      - uses: dtolnay/rust-toolchain@1.92
         with:
           targets: ${{ matrix.target }}
 

codex-rs/codex-backend-openapi-models/src/models/rate_limit_status_payload.rs

@@ -42,9 +42,12 @@ impl RateLimitStatusPayload {
     }
 }
 
-#[derive(Clone, Copy, Debug, Eq, PartialEq, Ord, PartialOrd, Hash, Serialize, Deserialize)]
+#[derive(
+    Clone, Copy, Debug, Eq, PartialEq, Ord, PartialOrd, Hash, Serialize, Deserialize, Default,
+)]
 pub enum PlanType {
     #[serde(rename = "guest")]
+    #[default]
     Guest,
     #[serde(rename = "free")]
     Free,
@@ -71,9 +74,3 @@ pub enum PlanType {
     #[serde(rename = "edu")]
     Edu,
 }
-
-impl Default for PlanType {
-    fn default() -> PlanType {
-        Self::Guest
-    }
-}

codex-rs/core/src/config/types.rs

@@ -423,10 +423,11 @@ impl Default for Notifications {
 /// Terminals generally encode both mouse wheels and trackpads as the same "scroll up/down" mouse
 /// button events, without a magnitude. This setting controls whether Codex uses a heuristic to
 /// infer wheel vs trackpad per stream, or forces a specific behavior.
-#[derive(Serialize, Deserialize, Debug, Clone, Copy, PartialEq, Eq, JsonSchema)]
+#[derive(Serialize, Deserialize, Debug, Clone, Copy, PartialEq, Eq, JsonSchema, Default)]
 #[serde(rename_all = "snake_case")]
 pub enum ScrollInputMode {
     /// Infer wheel vs trackpad behavior per scroll stream.
+    #[default]
     Auto,
     /// Always treat scroll events as mouse-wheel input (fixed lines per tick).
     Wheel,
@@ -434,12 +435,6 @@ pub enum ScrollInputMode {
     Trackpad,
 }
 
-impl Default for ScrollInputMode {
-    fn default() -> Self {
-        Self::Auto
-    }
-}
-
 /// Collection of settings that are specific to the TUI.
 #[derive(Serialize, Deserialize, Debug, Clone, PartialEq, Default, JsonSchema)]
 #[schemars(deny_unknown_fields)]

codex-rs/core/src/shell.rs

@@ -340,6 +340,7 @@ mod detect_shell_type_tests {
 #[cfg(unix)]
 mod tests {
     use super::*;
+    use std::path::Path;
     use std::path::PathBuf;
     use std::process::Command;
 
@@ -350,7 +351,7 @@ mod tests {
 
         let shell_path = zsh_shell.shell_path;
 
-        assert_eq!(shell_path, PathBuf::from("/bin/zsh"));
+        assert_eq!(shell_path, Path::new("/bin/zsh"));
     }
 
     #[test]
@@ -360,7 +361,7 @@ mod tests {
 
         let shell_path = zsh_shell.shell_path;
 
-        assert_eq!(shell_path, PathBuf::from("/bin/zsh"));
+        assert_eq!(shell_path, Path::new("/bin/zsh"));
     }
 
     #[test]
@@ -369,9 +370,9 @@ mod tests {
         let shell_path = bash_shell.shell_path;
 
         assert!(
-            shell_path == PathBuf::from("/bin/bash")
-                || shell_path == PathBuf::from("/usr/bin/bash")
-                || shell_path == PathBuf::from("/usr/local/bin/bash"),
+            shell_path == Path::new("/bin/bash")
+                || shell_path == Path::new("/usr/bin/bash")
+                || shell_path == Path::new("/usr/local/bin/bash"),
             "shell path: {shell_path:?}",
         );
     }
@@ -381,7 +382,7 @@ mod tests {
         let sh_shell = get_shell(ShellType::Sh, None).unwrap();
         let shell_path = sh_shell.shell_path;
         assert!(
-            shell_path == PathBuf::from("/bin/sh") || shell_path == PathBuf::from("/usr/bin/sh"),
+            shell_path == Path::new("/bin/sh") || shell_path == Path::new("/usr/bin/sh"),
             "shell path: {shell_path:?}",
         );
     }

codex-rs/core/src/tools/handlers/read_file.rs

@@ -40,9 +40,10 @@ struct ReadFileArgs {
     indentation: Option<IndentationArgs>,
 }
 
-#[derive(Deserialize)]
+#[derive(Deserialize, Default)]
 #[serde(rename_all = "snake_case")]
 enum ReadMode {
+    #[default]
     Slice,
     Indentation,
 }
@@ -461,12 +462,6 @@ mod defaults {
         }
     }
 
-    impl Default for ReadMode {
-        fn default() -> Self {
-            Self::Slice
-        }
-    }
-
     pub fn offset() -> usize {
         1
     }

codex-rs/protocol/src/protocol.rs

@@ -1656,21 +1656,18 @@ pub struct ReviewLineRange {
     pub end: u32,
 }
 
-#[derive(Debug, Clone, Copy, Display, Deserialize, Serialize, PartialEq, Eq, JsonSchema, TS)]
+#[derive(
+    Debug, Clone, Copy, Display, Deserialize, Serialize, PartialEq, Eq, JsonSchema, TS, Default,
+)]
 #[serde(rename_all = "snake_case")]
 pub enum ExecCommandSource {
+    #[default]
     Agent,
     UserShell,
     UnifiedExecStartup,
     UnifiedExecInteraction,
 }
 
-impl Default for ExecCommandSource {
-    fn default() -> Self {
-        Self::Agent
-    }
-}
-
 #[derive(Debug, Clone, Deserialize, Serialize, JsonSchema, TS)]
 pub struct ExecCommandBeginEvent {
     /// Identifier so this can be paired with the ExecCommandEnd event.

codex-rs/rust-toolchain.toml

@@ -1,3 +1,3 @@
 [toolchain]
-channel = "1.90.0"
+channel = "1.92.0"
 components = ["clippy", "rustfmt", "rust-src"]

codex-rs/scripts/setup-windows.ps1

@@ -179,7 +179,7 @@ if (-not (Ensure-Command 'cargo')) {
 Write-Host "==> Configuring Rust toolchain per rust-toolchain.toml" -ForegroundColor Cyan
 
 # Pin to the workspace toolchain and install components
-$toolchain = '1.90.0'
+$toolchain = '1.92.0'
 & rustup toolchain install $toolchain --profile minimal | Out-Host
 & rustup default $toolchain | Out-Host
 & rustup component add clippy rustfmt rust-src --toolchain $toolchain | Out-Host

codex-rs/tui/src/render/renderable.rs

@@ -275,7 +275,6 @@ impl<'a> FlexRenderable<'a> {
                     };
                     let child_size = child.desired_height(area.width).min(max_child_extent);
                     child_sizes[i] = child_size;
-                    allocated_size += child_size;
                     allocated_flex_space += child_size;
                 }
             }

codex-rs/tui2/src/render/renderable.rs

@@ -275,7 +275,6 @@ impl<'a> FlexRenderable<'a> {
                     };
                     let child_size = child.desired_height(area.width).min(max_child_extent);
                     child_sizes[i] = child_size;
-                    allocated_size += child_size;
                     allocated_flex_space += child_size;
                 }
             }

codex-rs/windows-sandbox-rs/src/setup_main_win.rs

@@ -76,19 +76,14 @@ struct Payload {
     refresh_only: bool,
 }
 
-#[derive(Debug, Clone, Copy, Deserialize, Serialize, PartialEq, Eq)]
+#[derive(Debug, Clone, Copy, Deserialize, Serialize, PartialEq, Eq, Default)]
 #[serde(rename_all = "kebab-case")]
 enum SetupMode {
+    #[default]
     Full,
     ReadAclsOnly,
 }
 
-impl Default for SetupMode {
-    fn default() -> Self {
-        Self::Full
-    }
-}
-
 fn log_line(log: &mut File, msg: &str) -> Result<()> {
     let ts = chrono::Utc::now().to_rfc3339();
     writeln!(log, "[{ts}] {msg}")?;