README

php-baremetal/conductor is the Composer plugin behind every php-baremetal firmware project. A firmware is a Composer project: its packages add functions, classes and chip support to the PHP that runs on the board, and conductor is what makes Composer understand them. It runs on your computer, never on the board, and is published on Packagist.

It needs PHP 8.4 or later and Composer 2 (composer-plugin-api ^2.0), and depends on php-baremetal/spec for the manifest model.

What it does

Installs bm-* packages into the project. Packages whose Composer type starts with bm- (bm-ext, bm-hal, bm-lib, bm-php-ext) are installed in .phpbm/packages/<vendor>/<name> instead of vendor/, where the SDK build reads them.
Binds the HAL for the project's platform. A neutral extension requires a virtual such as php-baremetal/i2c-hal. When extra.baremetal.sdk is set, conductor walks the project's requirements, finds each php-baremetal/<x>-hal virtual, and adds the concrete provider for the SDK's platform (php-baremetal/esp32-<x>-hal for esp32@^1.0) to the project's requirements, so you never require a HAL yourself. It warns when the platform has no provider, and for the retired <x>-transport requirements.
Writes the build manifest. After every composer install and composer update it writes .phpbm/manifest.json (schema 1): the project's settings from extra.baremetal, and every installed bm-* package with its version, install path and extra.baremetal data. phpbm reads this file to build and flash. Problems it can detect (an extension without a module, two extensions with the same module, a HAL for another platform, a bm-php-ext with extra keys) are printed as warnings; an invalid configuration prints an error and removes a stale manifest.

All of it applies only to projects whose composer.json has an extra.baremetal object. Any other project installs as usual.

Install

Conductor is installed twice. Once per machine, so the plugin is already active during the very first dependency solve of a new project:

composer global require php-baremetal/conductor

And in the project, which phpbm init writes for you: require with ^1.0 and an allow-plugins entry, because Composer 2 does not run a plugin that is not allowed.

{
  "name": "acme/my-firmware",
  "type": "project",
  "repositories": [
    { "type": "composer", "url": "https://repository.php-baremetal.com", "canonical": true }
  ],
  "require": {
    "php-baremetal/conductor": "^1.0",
    "php-baremetal/ext-store": "^1.0"
  },
  "config": {
    "allow-plugins": { "php-baremetal/conductor": true },
    "platform": { "php": "8.5.11" }
  },
  "extra": {
    "baremetal": {
      "sdk": "esp32@^1.0",
      "board": "waveshare-esp32-s3-touch-lcd-1.85b",
      "runtime": "init-loop",
      "storage": "embedded"
    }
  }
}

The packages come from the php-baremetal registry (https://repository.php-baremetal.com, canonical, so it wins for php-baremetal/*); a package under development comes from a path repository next to it.

Project settings

Read from extra.baremetal, plus the PHP version from config.platform.php, which is required.

Key	Meaning
`sdk`	Required. `<name>@<constraint>`, for example `esp32@^1.0`. The name is the platform.
`board`	Required. A board id of the SDK.
`runtime`	Required. `init-loop`, `event-driven` or `web-server`.
`storage`	Required. `embedded` or `microsd`.
`src`, `entry`	Directory of the PHP sources (default `project-src`) and the entry script (default `index.php`).
`env`	Optional. Path, relative to the project, of a file of values baked into the firmware (never copied to the microSD).
`board-overrides`	Optional. Fields of the board descriptor to replace.
`options`	Optional. SDK and package options, each a string, an integer or a boolean.

The project name is the name of composer.json without its vendor. The SDK validates the values against its own descriptors when it builds.

Commands

Both work on the project in the current directory (or the one given with composer -d <dir>).

composer conductor:generate              # rewrite .phpbm/manifest.json
composer conductor:generate --dry-run    # print it, write nothing
composer conductor:generate --strict     # exit 1 if any problem was reported
composer conductor:info                  # the project and its bm-* packages

conductor:info prints the SDK, board, runtime, storage and PHP version, then one line per installed bm-* package.

Not for hand editing

.phpbm/ is generated: rebuild the manifest with composer conductor:generate instead of editing it, and keep the directory out of version control.

Development

The tests use php-baremetal/spec from Packagist. To test against a local checkout in ../spec instead, register it for your working copy and do not commit the change:

composer config repositories.spec '{"type":"path","url":"../spec","options":{"versions":{"php-baremetal/spec":"1.0.0"}}}'
composer install && vendor/bin/phpunit

License

MIT.

php-baremetal / conductor

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