Docker build-context inspector

Paste a Dockerfile and a list of repository files to see which COPY and ADD sources are available to the build.

Availability is based only on the supplied inventory and supported syntax. This does not run a build, inspect file contents or verify image availability, permissions or runtime behavior.

These tools run entirely in your browser. Nothing you paste or drop is uploaded, stored, or sent to analytics.

Try a sample:

Dockerfile

Repository file inventory

One repository-relative path per line, with forward slashes. A trailing / marks a directory; path -> target marks a symlink. Maximum 5000 entries, including inferred directories. See the guide for a file-list command.

This inventory lists every file and directory in the build source, including hidden and generated files.

Bex build settings

rootDir

Repository-relative service root. Empty means repository root.

dockerContext

Repository-relative context. Empty inherits rootDir; . explicitly selects the repository root.

dockerfilePath

Relative to rootDir, even when dockerContext differs. Empty means Dockerfile.

Context-root .dockerignore

The Dockerfile has its own .dockerignore file.

Limits: 256 KiB Dockerfile, 512 KiB inventory, 64 KiB and 1,000 rules per ignore file. Matching work is bounded; oversized checks are refused. Ctrl/Cmd+Enter checks the Dockerfile immediately.

Load a sample or paste a Dockerfile and file inventory to begin.