CLI. Run 'docker ps' and 'docker exec ... git describe'. Output the result as JSON.

docker-status-cli.php

#!/usr/bin/env php
<?php

/**
 * CLI. Run 'docker ps' and 'docker exec ... git describe'. Output the result as JSON.
 *
 * USAGE:
 *   sudo su
 *   ./docker-status.php
 *
 * @copyright © Nick Freear, 17-April-2018.
 */

error_reporting( E_ALL );
ini_set( 'display_errors', true );

// echo "Start\n";

define( 'D_PS_REGEX', '/(?P<ctr>\w+) +(?P<img>.+)\/(?P<srv>[\w\-]+)\-service:(?P<v>RC\d\.\d+) +(?P<cmd>.+) +(?P<cr>\d.+ ago) +(?P<st>Up \d+ \w+) +(?P<port>.+) {2,}(?P<name>.+)/' );

$labels = [
  'lti' => 'LTI',
  'rt'  => 'Reporting tool',
];

$result = [];

$output = [];
$return_var = null;
$last_line = exec( 'docker ps --no-trunc', $output, $return_var);

fwrite( STDERR, "docker ps - exit code: $return_var\n" );

foreach ($output as $line) {
    if (preg_match( D_PS_REGEX, $line, $matches)) {
        $matches = (object) $matches;

        $desc_cmd = "docker exec -t {$matches->ctr} sh -c \"git describe --always --long --tags --dirty\"";
        $diff_cmd = "docker exec -t {$matches->ctr} sh -c \"git diff --no-color --raw\"";

        $desc_output = [];
        $diff_output = [];
        $last_line = exec( $desc_cmd, $desc_output, $return_var );
        if (0 === $return_var) {
            $last_line = exec( $diff_cmd, $diff_output, $return_var );
        }

        fwrite( STDERR, $desc_cmd . PHP_EOL );

        $result[ $matches->srv ] = [
            'label' => isset( $labels[ $matches->srv ]) ? $labels[ $matches->srv ] : '(unknown)',
            'service' => $matches->srv,
            'version' => $matches->v,
            'container_id' => $matches->ctr,
            'image' => $matches->img . '/' . $matches->srv . '-service:..',
            'command' => trim( $matches->cmd ),
            'created' => $matches->cr,
            'status' => $matches->st,
            'ports' => trim( $matches->port ),
            'names' => $matches->name,

            'git_describe_cmd' => $desc_cmd,
            'git_describe' => $desc_output,
            'git_diff' => $diff_output,
        ];
    }
}

echo json_encode( $result, JSON_PRETTY_PRINT );

# End.