gistfile1.rb

after   'deploy:update_code', 'magento-snapshot:initialize'

namespace :magento-snapshot do

    desc "Initialize snapshot directories" 
    task :initialize, :roles => [:app] do         
        # Create snapshot directory
        run "mkdir -p #{shared_path}/snapshot"
        
        # Remove existing snapshot dir in case it is in the release path
        run "rm -Rf #{release_path}/snapshot"
        
        # Link shared snapshot to release
        run "ln -nfs #{shared_path}/snapshot #{release_path}/snapshot"
        
        # Download latest snapshot.php to /shell
        if !remote_file_exists?("#{release_path}/shell/snapshot.php")
            run "wget -P #{release_path}/shell --no-check-certificate -q https://github.com/guidance/magento-shell-tools/raw/master/shell/snapshot.php"
        end
        
        # Install crontab if necessary
        run "set -f; 
            cronentry='0 0 * * * #{release_path}/shell/snapshot.php'; 
            if crontab -l &>/dev/null; 
            then 
                if crontab -l | grep -q '#{release_path}/shell/snapshot.php'; 
                then 
                    echo 'Cron job detected, not updating crontab'; 
                else 
                    echo 'Cron job not detected, installing entry in crontab'; 
                    echo -e "`crontab -l`\n$cronentry" | crontab -; 
                fi; 
            else 
                echo 'No crontab found for user, installing new crontab with entry'; 
                echo $cronentry | crontab -; 
            fi; 
            set +f"
    end

end