Http://<librenms>/validate & ./validate.php inconsistent

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@murrant I’ve added a line of extra output in the Dependencies.php to see why the error is being thrown (ie. what is in the variable $composer_output for the composer version to not be found…)

public function validate(Validator $validator)
    {
        $composer_output = trim(shell_exec($validator->getBaseDir() . '/scripts/composer_wrapper.php --version'));
        $found = preg_match('/Composer (version )?([.0-9]+)/', $composer_output, $matches);

        if (!$found) {
            $validator->fail("No composer available, please install composer", "https://getcomposer.org/");
            **$validator->fail("Composer Output", $composer_output);**
            return;
        } else {
            $validator->ok("Composer Version: " . $matches[2]);
        }

And now I have some new potentially useful output…

[RuntimeException] The HOME or COMPOSER_HOME environment variable must be set for composer to run correctly