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BUILDING.md

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Building the project

To build the container project, you need:

Important

There is a bug in the vmnet framework on macOS 26 that causes network creation to fail if the container helper applications are located under your Documents or Desktop directories. If you use make install, you can simply run the container binary in /usr/local. If you prefer to use the binaries that make all creates in your project bin and libexec directories, locate your project elsewhere, such as ~/projects/container, until this issue is resolved.

Compile and test

Build container and the background services from source, and run basic and integration tests:

make all test integration

Copy the binaries to /usr/local/bin and /usr/local/libexec (requires entering an administrator password):

make install

Or to install a release build, with better performance than the debug build:

BUILD_CONFIGURATION=release make all test integration
BUILD_CONFIGURATION=release make install

Compile protobufs

container uses gRPC to communicate to the builder virtual machine that creates images from Dockerfiles, and depends on specific versions of grpc-swift and swift-protobuf. If you make changes to the gRPC APIs in the container-builder-shim project, install the tools and re-generate the gRPC code in this project using:

make protos

Develop using a local copy of Containerization

To make changes to container that require changes to the Containerization project, or vice versa:

  1. Clone the Containerization repository such that it sits next to your clone of the container repository. Ensure that you follow containerization instructions to prepare your build environment.

  2. In your development shell, go to the container project directory.

    cd container

  3. If the container services are already running, stop them.

    bin/container system stop

  4. Use the Swift package manager to configure use your local containerization package and update your Package.resolved file.

    /usr/bin/swift package edit --path ../containerization containerization
/usr/bin/swift package update containerization

    [!IMPORTANT] If you are using Xcode, you will need to temporarily modify Package.swift instead of using swift package edit, using a path dependency in place of the versioned container dependency:

    .package(path: "../containerization"),

  5. If you want container to use any changes you made in the vminit subproject of Containerization, update the system property to use the locally built init filesystem image:

    container system property set image.init vminit:latest

  6. Build container.

    make clean all

  7. Restart the container services.

    bin/container system stop
bin/container system start

To revert to using the Containerization dependency from your Package.swift:

  1. If you were using the local init filesystem, revert the system property to its default value:

    container system property clear image.init

  2. Use the Swift package manager to restore the normal containerization dependency and update your Package.resolved file. If you are using Xcode, revert your Package.swift change instead of using swift package unedit.

    /usr/bin/swift package unedit containerization
/usr/bin/swift package update containerization

  3. Rebuild container.

    make clean all

  4. Restart the container services.

    bin/container system stop
bin/container system start

Pre-commit hook

Run make pre-commit to install a pre-commit hook that ensures that your changes have correct formatting and license headers when you run git commit.