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<?php
declare(strict_types=1);
namespace Shirabe\Lint\Linters;
use Shirabe\Lint\Linter;
/**
* The Composer sources are pinned twice: as the `composer` submodule, which a `cargo` build reads,
* and as the `composer` flake input, which a `nix build` reads in its place because a flake source
* carries no submodule. Both have to name the same commit, or the two builds embed different
* Composer runtimes.
*/
final class ComposerPin implements Linter
{
public function name(): string
{
return 'composer_pin';
}
public function failureIntro(): string
{
return "The `composer` submodule and the `composer` flake input name different commits.\n"
. 'Point the input at the submodule commit and run `nix flake lock`:';
}
public function check(string $rootDir, array $excludes): array
{
$submoduleRev = $this->submoduleRev($rootDir);
$inputRev = $this->inputRev($rootDir);
if ($submoduleRev === $inputRev) {
return [];
}
return [
"submodule: {$submoduleRev}",
"flake input: {$inputRev}",
];
}
private function submoduleRev(string $rootDir): string
{
$command = sprintf('git -C %s ls-tree HEAD composer', escapeshellarg($rootDir));
exec($command, $output, $status);
if ($status !== 0 || $output === []) {
return '(unreadable: git ls-tree HEAD composer failed)';
}
// `<mode> commit <rev>\tcomposer`
$fields = preg_split('/\s+/', $output[0]);
return $fields[2] ?? '(unreadable: unexpected git ls-tree output)';
}
private function inputRev(string $rootDir): string
{
$lock = json_decode((string) file_get_contents("{$rootDir}/flake.lock"), true);
return $lock['nodes']['composer']['locked']['rev'] ?? '(missing from flake.lock)';
}
}
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