Codex fails to create `xcrun`'s cache in the sandbox
Open 💬 0 comments Opened Jun 3, 2026 by fluiderson
What version of Codex CLI is running?
codex-cli 0.136.0
What subscription do you have?
Enterprise
Which model were you using?
gpt-5.5
What platform is your computer?
Darwin 25.5.0 arm64 arm
What terminal emulator and version are you using (if applicable)?
Cursor 3.6.21
Codex doctor report
{
"schemaVersion": 1,
"overallStatus": "ok",
"codexVersion": "0.136.0",
"checks": {
"app_server.status": {
"id": "app_server.status",
"category": "app-server",
"status": "ok",
"summary": "background server is not running",
"details": {
"mode": "ephemeral",
"status": "not running"
},
"remediation": null,
"durationMs": 0
},
"config.load": {
"id": "config.load",
"category": "config",
"status": "ok",
"summary": "config loaded",
"details": {
"config.toml parse": "ok",
"enabled feature flags": "shell_tool, unified_exec, shell_snapshot, terminal_resize_reflow, sqlite, hooks, enable_request_compression, multi_agent, apps, tool_suggest, plugins, in_app_browser, browser_use, browser_use_external, computer_use, plugin_sharing, image_generation, skill_mcp_dependency_install, steer, guardian_approval, goals, collaboration_modes, tool_call_mcp_elicitation, personality, fast_mode, tui_app_server, workspace_dependencies",
"feature flag overrides": "none",
"feature flags enabled": "27",
"model": "<default>",
"model provider": "openai"
},
"remediation": null,
"durationMs": 0
},
"git.environment": {
"id": "git.environment",
"category": "git",
"status": "ok",
"summary": "git version 2.54.0",
"details": {
".git entry": "directory",
"git version": "git version 2.54.0",
"repo detected": "true",
"selected git": "/opt/homebrew/bin/git"
},
"remediation": null,
"durationMs": 7
},
"installation": {
"id": "installation",
"category": "install",
"status": "ok",
"summary": "installation looks consistent",
"details": {
"install context": "brew",
"managed by bun": "false",
"managed by npm": "false"
},
"remediation": null,
"durationMs": 2
},
"network.env": {
"id": "network.env",
"category": "network",
"status": "ok",
"summary": "network-related environment looks readable",
"details": {},
"remediation": null,
"durationMs": 0
},
"network.provider_reachability": {
"id": "network.provider_reachability",
"category": "reachability",
"status": "ok",
"details": {},
"remediation": null,
"durationMs": 136
},
"network.websocket_reachability": {
"id": "network.websocket_reachability",
"category": "websocket",
"status": "ok",
"summary": "Responses WebSocket handshake succeeded",
"details": {
"connect timeout": "15000 ms",
"handshake result": "HTTP 101 Switching Protocols",
"model provider": "openai",
"provider name": "OpenAI",
"reasoning header": "false",
"server model present": "false",
"supports websockets": "true",
"wire API": "responses"
},
"remediation": null,
"durationMs": 796
},
"runtime.provenance": {
"id": "runtime.provenance",
"category": "runtime",
"status": "ok",
"summary": "running brew on macos-aarch64",
"details": {
"install method": "brew",
"platform": "macos-aarch64",
"version": "0.136.0"
},
"remediation": null,
"durationMs": 0
},
"runtime.search": {
"id": "runtime.search",
"category": "search",
"status": "ok",
"summary": "search is OK (system)",
"details": {
"search command": "rg",
"search command readiness": "ripgrep 15.1.0",
"search provider": "system"
},
"remediation": null,
"durationMs": 2
},
"sandbox.helpers": {
"id": "sandbox.helpers",
"category": "sandbox",
"status": "ok",
"summary": "sandbox configuration is readable",
"details": {
"approval policy": "OnRequest",
"codex-linux-sandbox helper": "none",
"filesystem sandbox": "restricted",
"network sandbox": "restricted"
},
"remediation": null,
"durationMs": 0
},
"system.environment": {
"id": "system.environment",
"category": "system",
"status": "ok",
"summary": "OS language en-US",
"details": {
"LANG": "en_US.UTF-8",
"os": "Mac OS 26.5.1 [64-bit]",
"os language": "en-US",
"os type": "Mac OS",
"os version": "26.5.1"
},
"remediation": null,
"durationMs": 2
},
"terminal.env": {
"id": "terminal.env",
"category": "terminal",
"status": "ok",
"summary": "terminal metadata was detected",
"details": {
"COLORTERM": "truecolor",
"TERM_PROGRAM": "vscode",
"VSCODE_INJECTION": "present",
"color output": "disabled (stdout is not a terminal)",
"effective locale": "en_US.UTF-8",
"stderr is terminal": "true",
"stdin is terminal": "true",
"stdout is terminal": "false",
"terminal": "VS Code",
"terminal size": "155x37",
"terminal version": "3.6.21"
},
"remediation": null,
"durationMs": 0
},
"updates.status": {
"id": "updates.status",
"category": "updates",
"status": "ok",
"summary": "update configuration is locally consistent",
"details": {
"cached latest version": "0.136.0",
"check for update on startup": "true",
"latest version": "0.136.0",
"latest version status": "current version is not older",
"update action": "brew upgrade --cask codex"
},
"remediation": null,
"durationMs": 1179
}
}
}What issue are you seeing?
When I'm trying to make a linked artifact (e.g., an executable) with Rust, it reports
warning: output of `xcrun` while finding MacOSX.sdk
|
= note: xcrun: error: couldn't create cache file (errno=Operation not permitted)
xcrun: error: couldn't create cache file (errno=Operation not permitted)As I understand, on macOS, Rust tries to execute xcrun --sdk macosx --show-sdk-path that attempts to write its cache file outside of the sandbox.
What steps can reproduce the bug?
Ask Codex to run echo 'fn main() {}' | rustc -; rm rust_out.
Or ask it to run xcrun --sdk macosx --show-sdk-path.
What is the expected behavior?
No xcrun: error: couldn't create cache file errors.
Additional information
rustc 1.96.0 (ac68faa20 2026-05-25)