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PHP Composer Install Cloud Native Buildpack

This buildpack runs the composer command composer install to download project dependencies. It requires both composer and php on the path (see requires).

A usage example can be found in the samples repository under the php/composer directory.

Detection

Will add these requires/provisions to the build plan if and only if a composer.json file is found.

Requires:

  • composer
  • php

Provides:

  • composer-packages

Build

Will run composer install in the project workspace to download project dependencies. The dependencies will be placed in a new layer and symlinked into the workspace at the location specified by COMPOSER_VENDOR_DIR, which defaults to vendor.

If dependencies are needed for Composer install scripts, use BP_COMPOSER_INSTALL_GLOBAL to specify which dependencies to install.

Use of a composer.lock file will enable caching of the downloaded dependencies, such that subsequent builds with the same composer.lock file will not need to run composer install again.

Integration

The PHP Composer CNB provides composer-packages as a dependency. Downstream buildpacks can require that dependency by generating a Build Plan TOML file that looks like the following:

[[requires]]

    # The PHP Composer Install provision is named `composer-packages`.
    # This value is considered part of the public API for the buildpack and will not 
    # change without a plan for deprecation.
    name = "composer-packages"

    # The PHP Composer Install buildpack requires some additional metadata options.
    # If neither metadata.build or metadata.launch is provided, this buidpack will contribute
    # an ignored layer
    [requires.metadata]

        # Setting the build flag to true will ensure that packages installed by running
        # `composer install` are available for subsequent buildpacks during their launch phase
        launch = true

        # Setting the build flag to true will ensure that packages installed by running
        # `composer install` are available for subsequent buildpacks during their build phase
        build = true

Logging Configurations

To configure the level of log output from the buildpack itself, set the BP_LOG_LEVEL environment variable at build time either directly or through a project.toml file If no value is set, the default value of INFO will be used.

The options for this setting are:

  • INFO: (Default) log information about the detection and build processes
  • DEBUG: log debugging information about the detection and build processes
pack build my-app --env BP_LOG_LEVEL=DEBUG

Usage

To package this buildpack for consumption

$ ./scripts/package.sh -v <version>

This builds the buildpack's Go source using GOOS=linux by default. You can supply another value as the first argument to package.sh.

Configuration

COMPOSER

The COMPOSER variable allows you to specify the filename of composer.json. When set, this buildpack will use this location instead of composer.json in the detection phase. This value must be relative to the project root.

For more information, please reference the composer docs.

COMPOSER=somewhere/composer-other.json

BP_COMPOSER_INSTALL_OPTIONS

Use BP_COMPOSER_INSTALL_OPTIONS to specify options for the Composer install command. This buildpacks will always prepend --no-progress to the list of install options. The default is --no-dev.

Note: BP_COMPOSER_INSTALL_OPTIONS will be parsed using the shellwords library.

# Note that env variables will typically be provided to this buildpack using `pack build -e`
BP_COMPOSER_INSTALL_OPTIONS=--prefer-install --ignore-platform-reqs
# will result in an installation command of `composer install --no-progress --prefer-install --ignore-platform-reqs`
BP_COMPOSER_INSTALL_OPTIONS= # Note that this is set to empty
# will result in an installation command of `composer install --no-progress`
unset BP_COMPOSER_INSTALL_OPTIONS
# will result in an installation command of `composer install --no-progress --no-dev`

BP_COMPOSER_INSTALL_GLOBAL

Use BP_COMPOSER_INSTALL_GLOBAL to specify packages required by Composer scripts. These will be installed using composer global require. These packages will not be available to the application.

BP_COMPOSER_INSTALL_GLOBAL="friendsofphp/php-cs-fixer squizlabs/php_codesniffer=*"

Other environment variables

Other environment variables used by Composer may be passed in to configure Composer behavior. See the full list here. A few examples are shown here.

  • COMPOSER_VENDOR_DIR: Used to make Composer install the dependencies into a directory other than vendor. This value must be underneath the project root.

  • COMPOSER_AUTH: Used to set up authentication, for example to add a GitHub OAuth token to increase the default rate limit.