{"record":{"id":"7ee2edea6d141fda","repo":"agentscope-ai/agentscope","slug":"not-found-in-container-path-nstderr-result-st","errorCode":null,"errorMessage":"not found in container: {path}\\nstderr: {result.stderr.decode(errors='replace')}","messagePattern":"not found in container: (.+?)\\\\nstderr: (.+?)","errorType":"exception","errorClass":"FileNotFoundError","httpStatus":null,"severity":"error","filePath":"src/agentscope/workspace/_applecontainer/_applecontainer_backend.py","lineNumber":159,"sourceCode":"\n    async def read_file(self, path: str) -> bytes:\n        \"\"\"Read a file from the container via ``container exec cat``.\n\n        Args:\n            path (`str`):\n                Path to the file inside the container.\n\n        Returns:\n            `bytes`:\n                The raw file contents.\n\n        Raises:\n            `FileNotFoundError`:\n                If the path does not exist inside the container.\n        \"\"\"\n        result = await self.exec_shell([\"cat\", path])\n        if result.exit_code != 0:\n            raise FileNotFoundError(\n                f\"not found in container: {path}\\n\"\n                f\"stderr: {result.stderr.decode(errors='replace')}\",\n            )\n        return result.stdout\n\n    async def write_file(self, path: str, data: bytes) -> None:\n        \"\"\"Write *data* to a file inside the container via\n        ``container cp``.\n\n        Writes *data* to a host-side temp file, then copies it into the\n        container.\n\n        Args:\n            path (`str`):\n                Destination path inside the container.\n            data (`bytes`):\n                The raw bytes to write.\n        \"\"\"","sourceCodeStart":141,"sourceCodeEnd":177,"githubUrl":"https://github.com/agentscope-ai/agentscope/blob/e90f1c7592896cc95f6e5ee506194f533378247d/src/agentscope/workspace/_applecontainer/_applecontainer_backend.py#L141-L177","documentation":"AppleContainerWorkspace's read_file runs `cat <path>` inside the container via exec_shell; a non-zero exit code (usually 'No such file or directory') is surfaced as FileNotFoundError with the path and container stderr.","triggerScenarios":"Calling await workspace.read_file(path) where path does not exist inside the container filesystem, or is a directory/unreadable (cat fails). Paths are container-relative, not host-relative.","commonSituations":"Using host absolute paths like /Users/me/file.txt that don't exist in the container, reading a file before it was written into the workspace, typos in relative paths, or wrong working directory assumption inside the container.","solutions":["Use the path relative to the container workspace root, not a host path.","Verify the file exists first: await workspace.list_dir(...) or exec `test -f <path>`.","Create/write the file before reading it.","Handle FileNotFoundError and fall back to a default."],"exampleFix":"# before\ndata = await ws.read_file(\"/Users/me/project/main.py\")\n\n# after\ndata = await ws.read_file(\"main.py\")  # path inside the container","handlingStrategy":"try-catch","validationCode":"entries = await ws.list_dir(dirname(path))\nassert any(e.name == basename(path) for e in entries), \"file missing\"","typeGuard":null,"tryCatchPattern":"try:\n    data = await ws.read_file(path)\nexcept FileNotFoundError:\n    data = default_bytes  # or create the file first","preventionTips":["Always use container-relative paths, never host paths.","Write files before reading them; check with list_dir/exec test -f."],"tags":["applecontainer","workspace","file-not-found","container","asyncio"],"backgroundTag":"file-not-found","analyzedSha":"e90f1c7592896cc95f6e5ee506194f533378247d","analyzedAt":"2026-08-28T18:24:12.087Z","schemaVersion":2},"datasetVersion":"2026-08-28T21:17:43.275Z"}