Staging deployment using Rex

Rexfile.pm

use strict;
use warnings;

use Rex::Transaction;
use Rex::Apache::Build;
use Rex::Apache::Deploy "Symlink";

user "vgmdb";
private_key "/var/lib/jenkins/.ssh/id_rsa";
public_key "/var/lib/jenkins/.ssh/id_rsa.pub";
group frontend => "slave.vgmdb.org";

deploy_to "/home/vgmdb/deploy";
document_root "/home/vgmdb/www";

generate_deploy_directory sub {
    my ($file) = @_;
    $file =~ m/-([^\.]+)\.tar\.gz$/;
    return $1;
};

get_version_from "VERSION", qr{(.*)};

task "build", sub {
    run "git log --pretty=format:'%h' -n 1 > VERSION";

    build "vgmdb",
        exclude => [".git", ".gitignore"];
};

task "deploy", group => "frontend", sub {
    my $old_live = get_live_version;

    on_rollback {
       say "Rolling back to $old_live\n";
       switch_to_version($old_live);
    };

    deploy "vgmdb";

    needs "composer";
};

task "composer", group => "frontend", sub {
    run "cd /home/vgmdb/www; composer.phar update;";
};

task "jenkins", sub {
    transaction {
        do_task [ qw/build deploy/ ];
    };
};