Script: Backup all GitLab repositories to Synology NAS

gitlab2nas.php

<?php

// This script will back up all your GitLab repositories to a specified location.

// I recommend creating a seperate GitLab user for backups.
// You'll need to generate a personal access token for that user with API access (in GitLab).
// Next, generate a SSH keypair for the NAS user and attach it to the GitLab user.
// Finally, create a scheduled task in your NAS config to run this script: "php /some/location/git2nas.php"

// Config -- start
$BACKUP_BASEDIR = "/volume1/gitbackup";
$GITLAB_TOKEN = "{SET_ME}";
$GITLAB_SERVER = "{SET_ME}";
// Config -- end

// Step 1: Pull repository list from GitLab API
echo "Connecting to GitLab API to get repository list..." . PHP_EOL;

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, "{$GITLAB_SERVER}/api/v4/projects?per_page=200");
curl_setopt($ch, CURLOPT_HTTPHEADER, ["PRIVATE-TOKEN: {$GITLAB_TOKEN }"]);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$response = curl_exec($ch);
curl_close($ch);

// Step 2: Parse JSON
$parsed = json_decode($response);
$count = count($parsed);

echo "Downloaded list of repositories to back up: found {$count} items" . PHP_EOL;

$i = 0;

// Step 3: Iterate JSON items, cloning or fetching/pulling as needed
foreach ($parsed as $item) {
    $sshUrl = $item->ssh_url_to_repo;
    $targetPath = $BACKUP_BASEDIR . "/" . $item->path_with_namespace;

    $percentage = round(($i / $count) * 100, 2);
    $i++;

    echo "[{$i} of {$count}, {$percentage}%]" . PHP_EOL;
    echo "Cloning {$sshUrl} to {$targetPath}..." . PHP_EOL;

    if (!file_exists($targetPath)) {
        @shell_exec("mkdir {$targetPath}");
        echo shell_exec("cd {$BACKUP_BASEDIR} && git clone {$sshUrl} {$targetPath}") . PHP_EOL;
    } else {
        echo shell_exec("cd {$targetPath} && git fetch && git pull");
    }
}

// That's all, folks!
echo "Completed git backup process";

I've added another Script with just a slight difference:
This script is NOT executed automatically and contains the --prune parameter on fetch.

echo shell_exec("cd {$targetPath} && git fetch --all --prune");

This script is needed if you want to update your NAS-repositories with remotely deleted branches from gitlab.

I've set the script to disabled with time to yesterday and "no repeat". So if unauthorised user will delete branches in gitlab this isn't automatically synced to your NAS-version. So in case i really need to delete branches.
It's not the best solution and i will add a "backup directory" before --prune execution. So always when --prune-script is used i will backup my repositories with "rm -rf backup && cp $BACKUP_BASEDIR backup".
So you can switch back, if the notification email shows there are to many and wrong branches are deleted.
For those two Scripts i've always email-notification on.