[chef] How to recover from failed builds?

[Steve Bennett < >]

Hi all,

  A bit of a newbie question. I'm using chef solo and vagrant to deploy a django app. I didn't write the recipes, but tweaked them a bit to work on Ubuntu. I've finally got to the point where the app deploys correctly, first time. But one thing I noticed in that process is if the build fails some reason (generally while running buildout), then the "before_symlink" step doesn't get run again.

Not being a Rails developer, I don't really understand the deployment model (ie, directories 'shared', 'release', 'current') that is apparently assumed by Chef and followed implicitly. For example, I don't see an explicit step that creates a symlink 'current' to the release - it just happens. (The documentation http://wiki.opscode.com/display/chef/Deploy+Resource is a bit unclear )

So, I was wondering if someone could suggest changes to make to this script so that it would repeat the 'bash' block if there has not been a successful build. Thanks!

Steve

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deploy_revision "mytardis" do

  action :deploy

  deploy_to "/opt/mytardis"

  repository node['mytardis']['repo']

  branch node['mytardis']['branch']

  user "mytardis"

  group "mytardis"

  symlink_before_migrate(app_symlinks.merge({

      "data" => "var",

      "log" => "log",

      "buildout.cfg" => "buildout-prod.cfg",

      "settings.py" => "tardis/settings.py"

  }))

  purge_before_symlink([])

  create_dirs_before_symlink([])

  symlinks({})

  before_symlink do

    current_release = release_path

    bash "mytardis_buildout_install" do

      user "mytardis"

      cwd current_release

      code <<-EOH

        export PYTHON_EGG_CACHE=/opt/mytardis/shared/egg-cache

        python setup.py clean

        find . -name '*.py[co]' -delete

        python bootstrap.py

        bin/buildout -c buildout-prod.cfg install

        bin/django syncdb --noinput --migrate 

        bin/django collectstatic -l --noinput 

      EOH

    end

  end

  restart_command do

    current_release = release_path

    bash "mytardis_foreman_install_and_restart" do

      cwd "/opt/mytardis/current"

      code <<-EOH

        foreman export upstart /etc/init -a mytardis -p 3031 -u mytardis -l /var/log/mytardis -t ./foreman

        restart mytardis || start mytardis

      EOH

    end

  end

end

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