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pcbjam/docker
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Filename Latest commit message Latest commit date
Viktor Vaczi ffaadd258b fix(docker): make container emsdk authoritative for exec, stop host emsdk leak 
The wxWidgets autoconf build inside Docker failed with `emmake: command not
found` on a clean build, while the KiCad CMake build survived (CMake caches the
absolute compiler path). Two compounding causes:

1. `docker compose exec` bypasses the ENTRYPOINT, so it never sourced
   emsdk_env.sh and EMSDK was unset. env.sh then fell back to the local
   tools/emsdk.

2. The entrypoint's rsync from the host bind mount excluded only build-wasm and
   output, so the host's macOS-arm64 tools/emsdk got copied over the container's
   Linux emsdk. The macOS Mach-O python can't exec on Linux, so
   `emsdk construct_env` failed ("Exec format error") and emcc/emmake never
   landed on PATH.

Fixes:
- Set `ENV EMSDK=/emsdk` in the image so every process (including
  `docker compose exec`) resolves env.sh's EMSDK branch to the container's own
  emsdk and never falls back to tools/emsdk.
- Exclude `tools/emsdk` from the entrypoint rsync so the host emsdk can no
  longer leak into the container.

Validated with a clean wxWidgets build (`build-wxuniversal-wasm.sh --clean`):
reconfigures and compiles all 42 wx libs against /emsdk with no missing-tool
errors.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2026-05-25 19:41:55 +02:00
..
build.sh wasm: validate kicad hi-dpi scaling 2026-03-22 12:48:05 +01:00
docker-compose.yml Add Quick Start docs and branch-specific Docker builds 2026-01-03 09:08:12 +01:00
Dockerfile fix(docker): make container emsdk authoritative for exec, stop host emsdk leak 2026-05-25 19:41:55 +02:00
entrypoint.sh fix(docker): make container emsdk authoritative for exec, stop host emsdk leak 2026-05-25 19:41:55 +02:00
README.md Add Quick Start docs and branch-specific Docker builds 2026-01-03 09:08:12 +01:00
shell.sh Add Docker build environment for KiCad WASM 2025-12-08 12:07:01 +01:00

README.md

Docker Build Environment for KiCad WASM

This directory contains Docker configuration for building KiCad for WebAssembly in a reproducible, isolated environment.

Prerequisites

  • Docker Desktop (with Docker Compose v2)
  • Git submodules initialized: git submodule update --init --recursive

Quick Start

# Build KiCad WASM (full build)
./docker/build.sh

# Build with options
./docker/build.sh --no-clean    # Skip cleaning build directory
./docker/build.sh --debug       # Build with debug symbols

# Interactive shell for debugging
./docker/shell.sh

Branch-Specific Builds

Each git branch gets isolated Docker containers and volumes, enabling parallel development:

# On branch 'main' → containers/volumes prefixed with 'kicad-wasm-main'
# On branch 'feature-x' → containers/volumes prefixed with 'kicad-wasm-feature-x'

This allows you to:

  • Work on multiple branches simultaneously using git worktrees
  • Each worktree has its own build cache (no conflicts)
  • Switch branches without rebuilding from scratch

Using git worktrees for parallel development:

# Create a worktree for a new branch
git worktree add ../kicad-wasm-feature path/to/branch

# Build in the worktree (uses isolated Docker volumes)
cd ../kicad-wasm-feature
./docker/build.sh

# List all worktrees
git worktree list

What Gets Built

The build process includes:

  1. Dependencies (cached in Docker volume):

    • GLM (header-only)
    • Zstd, Protobuf
    • FreeType, HarfBuzz
    • Pixman, Cairo
    • Boost (Locale)
    • OpenCASCADE (optional, for 3D/STEP)
    • CURL headers, libgit2 headers (stubs)

  2. wxWidgets (built from submodule)

  3. KiCad PCBnew (main application)

Container Resources

Configured for M4 Max (adjust in docker-compose.yml):

  • CPUs: 10 cores
  • Memory: 16GB

Volume Strategy

Path Type Purpose
/workspace Bind mount Source code
/workspace/build-wasm Named volume Build cache (deps, sysroot)
/workspace/output Bind mount Final WASM output

Common Commands

# Start container
docker compose -f docker/docker-compose.yml up -d

# Run a command inside
docker compose -f docker/docker-compose.yml exec kicad-wasm-builder <command>

# View logs
docker compose -f docker/docker-compose.yml logs -f

# Stop container
docker compose -f docker/docker-compose.yml down

# Clear build cache (full rebuild)
docker volume rm docker_kicad-build-cache

Troubleshooting

Build freezes

The OpenCASCADE build is very resource-intensive. If it freezes:

  1. Reduce parallel jobs: Edit script to use -j4 instead of -j$(nproc)
  2. Monitor with docker stats
  3. Consider building OpenCASCADE separately with ./scripts/deps/build-opencascade.sh

Permission issues

Files created in container are owned by root. To fix:

sudo chown -R $(whoami) output/

Cache issues

# Clear all cached builds
docker volume rm docker_kicad-build-cache

# Or clear specific stamps inside container
./docker/shell.sh
rm /workspace/build-wasm/stamps/*.stamp