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Graph/runtime-filesystem-restrictions

AntiPattern

Runtime File System Restrictions

runtime-filesystem-restrictions

Serverless and deployment platforms restrict where code can write or depend on build output, so runtime writes fail or unexpected build artifacts/paths appear (e.g., read-only public, only /tmp writable).

Node Details

Public graph metadata

Updated6/23/2026

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30 linked nodes

MATCHESSolution

Split challenge data into public metadata and private scoring data — The sandbox binds the target source repo into a temporary workspace and binds only the generated MCP config. Tension: the benchmark package path with a tmpfs mount. Outcome: Added a disable switch for environments that cannot run the sandbox.

MATCHESSolution

Harden environment-derived TMPDIR usage by validating tmp is absolute/does not contain unexpected characters — environment-derived TMPDIR usage. Tension: disallow path traversal sequences if those end up used in filesystem operations. Outcome: Consider using safer formatting (snprintf into buffer) and documenting invariants for xheader_format_name / header encoding.

MATCHESSolution

Mark React’s JSX runtime entrypoints (react/jsx-runtime and react/jsx-dev-runtime) as externals in rollupOptions.external (along with other expected externals) so they aren’t bundled into dist. Optionally, add an npmignore under dist (not at repo root) if you must exclude node_modules/_virtual from the published files.

MATCHESSolution

Copy the full node_modules directory from the build stage into the runtime image

MATCHESSolution

The most robust and recommended solution is to make your build script create the directory structure that Vercel expects. — Vercel Build Output API Structure. Tension: This gives you full control over the deployment.

MATCHESSolution

if (runtimeFiles['php/php']) { runtimeFiles['php/php'].mode = 0o755; } if (runtimeFiles['php/composer']) { runtimeFiles['php/composer'].mode = 0o755; } — inside `.vercel\builders\node_modules\vercel-php\dist\utils.js` of Laravel project directory. Tension: Somehow found a bug inside `.vercel\builders\node_modules\vercel-php\dist\utils.js` of Laravel project directory. Outcome: solved the problem for me.

MATCHESSolution

You can set your environment variables depending on the deployment environement you're in and are accessible during the build process. — Instead of reading your environment variables from your directory. Tension: For the reason as to why your env variables aren't available in your mark up file.

MATCHESSolution

Store uploads in the serverless writable temp directory (os.tmpdir()) during the request and then persist the files externally (e.g., upload to object storage like S3) or stream them directly; update the Multer storage destination to use os.tmpdir() and avoid serving from a project-local uploads folder.

MATCHESSolution

Only `/tmp` folder is available — if you want to persist the file then better to store somewhere. Tension: as its a temporary folder. Outcome: better to store somewhere, probably in S3.

MATCHESSolution

you CANNOT use public folder for serving dynamic images — then create a endpoint that read it. Tension: public folder for serving dynamic images. Outcome: you can try to create another folder in project root then create a endpoint that read it with `fs.readFileSync`.

MATCHESSolution

Run `sourcemaps inject` on the same build output, upload the resulting modified assets, and deploy those exact injected files (JS/CSS) to production (or skip injecting and upload/upload-only maps consistently with the deployed artifacts).

MATCHESSolution

A better approach would be to create static files for the scope of your test — For this simple test case. Tension: I do not want to upload a file just for the test purpose. Outcome: I would simply create the file with some content in it and delete it after the test is over.

MATCHESSolution

I'd create a small temporary file manager — To make it even safer (e.g. if the test exits with an exception, it might skip the cleanup of the temp files). Tension: it might skip the cleanup of the temp files.

MATCHESSolution

CI Stability Fix. Tension: workflow randomly fails at times. Outcome: xcodebuild -downloadPlatform iOS || echo "⚠️ Platform already installed or download failed, continuing...".

MATCHESSolution

I have to run with the extra `--artifact-server-path /tmp/artifacts` — act -j build-and-deploy -W .github/workflows/deploy_frontend.yml. Tension: it solves it. Outcome: Complete run command.

MATCHESSolution

Tension: Since you are running in the same env your prod is running, you are limiting yourself from using same configurations like port, container name etc. Outcome: the env is completely clean and doesn't interfere with the host env.

MATCHESSolution

You need to remove that from the Dockerfile — The FROM line specifies `--platform=$BUILDPLATFORM`. Tension: stop building images with a platform that doesn't match the contents of the filesystem layers. Outcome: to stop building images with a platform that doesn't match the contents of the filesystem layers.

MATCHESSolution

Error: Unable to process file command 'output' successfully. Error: Invalid format ' "build_dir1": {'. Outcome: The GitHub Output is expecting the JSON to be on a single line.

MATCHESSolution

Avoid deploying to the same host as the self-hosted runner; instead use separate infrastructure or safer deployment approaches (e.g., GitHub Environments/Deployments) and restrict runner permissions/isolate the runner from application runtime.

MATCHESSolution

Run the student code in a restricted environment while the verification code runs in a separate un-restricted environment. Tension: there's no trust boundary between the student's function and the verification code. Outcome: Untrusted or unreliable code runs in a separate process with limited access.

MATCHESSolution

You should not use that value in the app that the users run — such as your development machine, a server that you control, or a serverless environment like Cloud Run/Cloud Functions. Tension: If a value is meant to be a secret from the users of your app. Outcome: make an endpoint on that environment that your app can call, and protect access to the endpoint.

MATCHESSolution

Images are stored in a secure, isolated directory. — Temporary storage introduces risks if not managed correctly. Tension: even in case of errors. Outcome: Images are deleted promptly after processing.

MATCHESSolution

Build the target path using Path APIs from a fixed base directory (e.g., parentPath.resolve(...)), then verify that the resolved file remains within the intended parent directory before opening the stream. Use try-with-resources for InputStream/OutputStream to manage closing safely.

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Use a newer runtime base image such as mcr.microsoft.com/dotnet/aspnet:6.0-alpine for the final stage

MATCHESSolution

the webserver itself doesn't write access — because it can't update the files without write access. Tension: Some CMSs get annoyed if they don't have write access. Outcome: upload updates via FTP (Or via cloning stage, or however your devops runs).

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Use least-privilege permissions by granting write access only to directories and files expected to be modified

MATCHESSolution

you can always just add the giant resource file directly into your jlink-produced sparse jvm build directly — jlink produces a whole bunch of files that you must then pack into an installer, zip up, or otherwise move to a system or run in place. Tension: This is ugly, error-prone, and requires writing multiple paths that are hard to test. Outcome: Your code can then just.. load the resource file straight from disk.

MATCHESSolution

add a conditional breakpoint on a few jdk classes that can create tmp files — If you are capable of a debugging session. Tension: you need to edit the webserver launcher script. Outcome: instrument those call sites; write a pure java agent to load on the java.exe command line.

MATCHESSolution

Move non-bootstrap files — specs, changelogs, legal docs, reference material. Tension: non-bootstrap .md files in workspace root get injected into every turn's system prompt.

MATCHESSolution

Tension: prevent individual files from bloating.

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