Class: EY::Serverside::DeployBase

Inherits:
Task
  • Object
show all
Includes:
EY::Serverside::DependencyManager::LegacyHelpers
Defined in:
lib/engineyard-serverside/deploy.rb

Direct Known Subclasses

Deploy

Instance Attribute Summary

Attributes inherited from Task

#config, #servers, #shell

Instance Method Summary collapse

Methods inherited from Task

#initialize, #load_ey_yml, #paths, #require_custom_tasks, #roles, #run, #sudo

Constructor Details

This class inherits a constructor from EY::Serverside::Task

Instance Method Details

#abort_on_bad_paths_in_release_directoryObject


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# File 'lib/engineyard-serverside/deploy.rb', line 213

def abort_on_bad_paths_in_release_directory
  shell.substatus "Checking for disruptive files in #{paths.releases}"

  bad_paths = paths.all_releases.reject do |path|
    path.basename.to_s =~ /^[\d]+$/
  end

  if bad_paths.any?
    shell.fatal "Bad paths found in #{paths.releases}:\n\t#{bad_paths.join("\n\t")}\nStoring files in this directory will disrupt latest_release, diff detection, rollback, and possibly other features."
    raise
  end
end

#bundleObject


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# File 'lib/engineyard-serverside/deploy.rb', line 95

def bundle
  install_dependencies
end

#cached_deployObject


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# File 'lib/engineyard-serverside/deploy.rb', line 22

def cached_deploy
  shell.status "Deploying app from cached copy at #{Time.now.asctime}"
  load_ey_yml
  require_custom_tasks
  push_code

  shell.status "Starting full deploy"

  new_release do
    callback(:before_deploy)
    check_repository
    create_revision_file
    run_with_callbacks(:bundle)
    setup_services
    configure_platform
    symlink_configs
    setup_sqlite3_if_necessary
    run_with_callbacks(:compile_assets)
    enable_maintenance_page
    run_with_callbacks(:migrate)
    callback(:before_symlink)
    # We don't use run_with_callbacks for symlink because we need
    # to clean up manually if it fails.
    symlink
  end

  callback(:after_symlink)
  run_with_callbacks(:restart)
  disable_maintenance_page

  cleanup_old_releases
  gc_repository_cache
  callback(:after_deploy)
  shell.status "Finished deploy at #{Time.now.asctime}"
rescue Exception => e
  shell.status "Finished failing to deploy at #{Time.now.asctime}"
  shell.error "Exception during deploy: #{e.inspect}\n#{e.backtrace}"
  puts_deploy_failure
  raise
end

#callback(what) ⇒ Object


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# File 'lib/engineyard-serverside/deploy.rb', line 453

def callback(what)
  @callbacks_reached ||= true
  Callbacks::Distributor.distribute(self, what)
end

#check_dependenciesObject


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# File 'lib/engineyard-serverside/deploy.rb', line 87

def check_dependencies
  dependency_manager.check
end

#check_repositoryObject


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# File 'lib/engineyard-serverside/deploy.rb', line 83

def check_repository
  check_dependencies
end

#clean_release_directory(dir, count) ⇒ Object

Remove all but the most-recent count releases from the specified release directory. IMPORTANT: This expects the release directory naming convention to be something with a sensible lexical order. Violate that at your peril.


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# File 'lib/engineyard-serverside/deploy.rb', line 205

def clean_release_directory(dir, count)
  @cleanup_failed = true
  ordinal = count.succ.to_s
  shell.status "Cleaning release directory: #{dir}"
  sudo "ls -r #{dir} | tail -n +#{ordinal} | xargs [email protected] rm -rf #{dir}/@"
  @cleanup_failed = false
end

#cleanup_old_releasesObject

task


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# File 'lib/engineyard-serverside/deploy.rb', line 191

def cleanup_old_releases
  count = config.keep_releases.to_i
  if count < 1
    shell.error "Refusing to delete all releases! keep_releases must be >= 1 (got #{count})"
    count = EY::Serverside::Deploy::Configuration::DEFAULT_KEEP_RELEASES
    shell.warning "Running instead with default value for keep_releases: #{count}"
  end
  clean_release_directory(paths.releases, count)
end

#configure_commandObject


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# File 'lib/engineyard-serverside/deploy.rb', line 350

def configure_command
  ENV['EY_SERVERSIDE_CONFIGURE_COMMAND'] || begin
    configure_script = "/engineyard/bin/app_#{config.app}_configure"
    return <<-CONFIGURE
if [ -x "#{configure_script}" ] || which "#{configure_script}" >/dev/null 2>&1; then
  EY_DEPLOY_APP='#{config.app}' EY_DEPLOY_RELEASE_PATH='#{paths.active_release.to_s}' #{configure_script};
fi
    CONFIGURE
  end
end

#configure_platformObject


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# File 'lib/engineyard-serverside/deploy.rb', line 346

def configure_platform
  run configure_command
end

#copy_repository_cacheObject

task


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# File 'lib/engineyard-serverside/deploy.rb', line 276

def copy_repository_cache
  paths.new_release!
  shell.status "Copying to #{paths.active_release}"
  exclusions = Array(config.copy_exclude).map { |e| %|--exclude="#{e}"| }.join(' ')
  run("mkdir -p #{paths.active_release} #{paths.shared_config} && rsync -aq #{exclusions} #{paths.repository_cache}/ #{paths.active_release}")
end

#create_revision_fileObject


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# File 'lib/engineyard-serverside/deploy.rb', line 283

def create_revision_file
  run create_revision_file_command
end

#create_revision_file_commandObject


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# File 'lib/engineyard-serverside/deploy.rb', line 71

def create_revision_file_command
  source.create_revision_file_command(paths.active_revision)
end

#deployObject

default task


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# File 'lib/engineyard-serverside/deploy.rb', line 16

def deploy
  shell.status "Starting deploy at #{shell.start_time.asctime}"
  update_repository_cache
  cached_deploy
end

#disable_maintenance_pageObject


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# File 'lib/engineyard-serverside/deploy.rb', line 115

def disable_maintenance_page
  maintenance.conditionally_disable
end

#enable_maintenance_pageObject


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# File 'lib/engineyard-serverside/deploy.rb', line 111

def enable_maintenance_page
  maintenance.conditionally_enable
end

#ensure_git_ssh_wrapperObject


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# File 'lib/engineyard-serverside/deploy.rb', line 155

def ensure_git_ssh_wrapper
  ENV['GIT_SSH'] = ssh_executable.to_s
end

#ensure_ownership(*targets) ⇒ Object


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# File 'lib/engineyard-serverside/deploy.rb', line 438

def ensure_ownership(*targets)
  sudo %|find #{targets.join(' ')} \\( -not -user #{config.user} -or -not -group #{config.group} \\) -exec chown #{config.user}:#{config.group} "{}" +|
end

#gc_repository_cacheObject


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# File 'lib/engineyard-serverside/deploy.rb', line 67

def gc_repository_cache
  source.gc_repository_cache if config.gc?
end

#generate_ssh_wrapperObject

We specify 'IdentitiesOnly' to avoid failures on systems with > 5 private keys available. We set UserKnownHostsFile to /dev/null because StrickHostKeyChecking no doesn't ignore existing entries in known_hosts; we want to actively ignore all such. Learned this at lists.mindrot.org/pipermail/openssh-unix-dev/2009-February/027271.html (Thanks Jim L.)


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# File 'lib/engineyard-serverside/deploy.rb', line 174

def generate_ssh_wrapper
  path = paths.ssh_wrapper
  <<-SCRIPT
mkdir -p #{path.dirname}
[ -x #{path} ] || cat > #{path} <<'SSH'
#!/bin/sh
unset SSH_AUTH_SOCK

# Filter command mangling by git when using `GIT_SSH` and the string `plink`
command=$(echo "$*" | sed -e "s/^-batch //")
ssh -o CheckHostIP=no -o StrictHostKeyChecking=no -o PasswordAuthentication=no -o LogLevel=INFO -o IdentityFile=#{paths.deploy_key} -o IdentitiesOnly=yes ${command}
SSH
chmod 0700 #{path}
  SCRIPT
end

#install_dependenciesObject


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# File 'lib/engineyard-serverside/deploy.rb', line 99

def install_dependencies
  dependency_manager.install
end

#migrateObject

task


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# File 'lib/engineyard-serverside/deploy.rb', line 256

def migrate
  return unless config.migrate?
  @migrations_reached = true
  cmd = "cd #{paths.active_release} && PATH=#{paths.binstubs}:$PATH #{config.framework_envs} #{config.migration_command}"
  roles :app_master, :solo do
    shell.status "Migrating: #{cmd}"
    run(cmd)
  end
end

Move a symlink as atomically as we can.

mv -T renames 'next' to 'current' instead of moving 'next' to current/next' mv -T isn't available on OS X and maybe elsewhere, so fallback to rm && ln


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# File 'lib/engineyard-serverside/deploy.rb', line 446

def move_symlink(source, link, name)
  next_link = link.dirname.join(name)
  mv_t  = "ln -nfs #{source} #{next_link} && mv -T #{next_link} #{link} >/dev/null 2>&1"
  rm_ln = "rm -rf #{next_link} #{link} && ln -nfs #{source} #{link}"
  "((#{mv_t}) || (#{rm_ln}))"
end

#new_release(&block) ⇒ Object


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# File 'lib/engineyard-serverside/deploy.rb', line 266

def new_release(&block)
  copy_repository_cache
  with_failed_release_cleanup do
    shell.status "Ensuring proper ownership."
    ensure_ownership(paths.active_release)
    block.call
  end
end

#push_codeObject

task


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# File 'lib/engineyard-serverside/deploy.rb', line 126

def push_code
  shell.status "Pushing code to all servers"
  servers.remote.run_for_each do |server|
    server.sync_directory_command(paths.repository_cache)
  end
end

#rails_application?Boolean

Returns:

  • (Boolean)

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# File 'lib/engineyard-serverside/deploy.rb', line 91

def rails_application?
  dependency_manager.rails_version
end

#restartObject

task


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# File 'lib/engineyard-serverside/deploy.rb', line 134

def restart
  @restart_failed = true
  if config.restart_groups.to_i > 1
    shell.status "Restarting app servers in #{config.restart_groups.to_i} groups"
  else
    shell.status "Restarting app servers"
  end

  servers.roles(:app_master, :app, :solo).in_groups(config.restart_groups.to_i) do |group|
    shell.substatus "Restarting #{group.size} server#{group.size == 1 ? '' : 's'}"
    group.run(restart_command)
  end

  shell.status "Finished restarting app servers"
  @restart_failed = false
end

#restart_commandObject


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# File 'lib/engineyard-serverside/deploy.rb', line 151

def restart_command
  %{LANG="en_US.UTF-8" /engineyard/bin/app_#{config.app} deploy}
end

#restart_with_maintenance_pageObject


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# File 'lib/engineyard-serverside/deploy.rb', line 103

def restart_with_maintenance_page
  load_ey_yml
  require_custom_tasks
  enable_maintenance_page
  restart
  disable_maintenance_page
end

#rollbackObject

task


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# File 'lib/engineyard-serverside/deploy.rb', line 228

def rollback
  if config.rollback_paths!
    begin
      load_ey_yml
      require_custom_tasks
      rolled_back_release = paths.latest_release
      shell.status "Rolling back to previous release: #{short_log_message(config.active_revision)}"
      abort_on_bad_paths_in_release_directory
      run_with_callbacks(:symlink)
      sudo "rm -rf #{rolled_back_release}"
      bundle
      shell.status "Restarting with previous release."
      enable_maintenance_page
      run_with_callbacks(:restart)
      disable_maintenance_page
      shell.status "Finished rollback at #{Time.now.asctime}"
    rescue Exception
      shell.status "Failed to rollback at #{Time.now.asctime}"
      puts_deploy_failure
      raise
    end
  else
    shell.fatal "Already at oldest release, nothing to roll back to."
    exit(1)
  end
end

#run_with_callbacks(task) ⇒ Object


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# File 'lib/engineyard-serverside/deploy.rb', line 119

def run_with_callbacks(task)
  callback("before_#{task}")
  send(task)
  callback("after_#{task}")
end

#setup_servicesObject


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# File 'lib/engineyard-serverside/deploy.rb', line 287

def setup_services
  shell.status "Setting up external services."
  previously_configured_services = config.configured_services

  begin
    sudo(config.services_check_command)
  rescue EY::Serverside::RemoteFailure
    shell.info "Could not setup services. Upgrade your environment to get services configuration."
    return
  end

  begin
    sudo(config.services_setup_command)
  rescue EY::Serverside::RemoteFailure => e
    if previously_configured_services
      shell.warning <<-WARNING
External services configuration not updated. Using previous version.
Deploy again if your services configuration appears incomplete or out of date.
#{e}
      WARNING
    end
  end

  if services = config.configured_services
    shell.status "Services configured: #{services.join(', ')}"
    dependency_manager.show_ey_config_instructions
  end
end

#setup_shared_tmpObject


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# File 'lib/engineyard-serverside/deploy.rb', line 375

def setup_shared_tmp
  if config.shared_tmp?
    shell.substatus "Creating and symlinking shared tmp directory if empty"
    run <<-SETUP_TMP
if [ -e "#{paths.active_tmp}" ] && [ ! "$(ls #{paths.active_tmp} 2>&1)" ]; then
  rm -rf #{paths.active_tmp};
fi;
if [ ! -e "#{paths.active_tmp}" ]; then
  mkdir -p #{paths.shared_tmp} && ln -nfs #{paths.shared_tmp} #{paths.active_tmp};
fi
    SETUP_TMP

    unless paths.active_tmp.symlink?
      note = "This application's repository has tmp/ with contents committed.\n"
      if config.precompile_assets?
        note << "Asset precompile speed can be increased by sharing tmp across releases.\n"
      end
      note << <<-NOTICE
Enable shared tmp with the follow git command (if applicable):

  $ git rm -r tmp/* && echo '*' > tmp/.gitignore

Or, disable this feature via ey.yml configuration as follows:

defaults:
  shared_tmp: false
      NOTICE
      shell.notice note
    end
  else
    shell.substatus "Prepare shared pids directory"
    run "rm -rf #{paths.active_tmp}/pids"
  end
end

#setup_sqlite3_if_necessaryObject


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# File 'lib/engineyard-serverside/deploy.rb', line 316

def setup_sqlite3_if_necessary
  if dependency_manager.uses_sqlite3?
    shell.status "Setting up SQLite3 Database for compatibility with application's chosen adapter"
    shell.warning "SQLite3 cannot persist across servers. Please upgrade to a supported database."

    shell.substatus "Create databases directory if needed"
    run "mkdir -p #{paths.shared}/databases"

    shell.substatus "Create SQLite database if needed"
    run "touch #{paths.shared}/databases/#{config.framework_env}.sqlite3"

    shell.substatus "Create config directory if needed"
    run "mkdir -p #{paths.active_release_config}"

    shell.substatus "Generating SQLite config"
    run <<-WRAP
cat > #{paths.shared_config}/database.sqlite3.yml<<'YML'
#{config.framework_env}:
  adapter: sqlite3
  database: #{paths.shared}/databases/#{config.framework_env}.sqlite3
  pool: 5
  timeout: 5000
YML
    WRAP

    shell.substatus "Symlink database.yml"
    run "ln -nfs #{paths.shared_config}/database.sqlite3.yml #{paths.active_release_config}/database.yml"
  end
end

#short_log_message(revision) ⇒ Object


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# File 'lib/engineyard-serverside/deploy.rb', line 75

def short_log_message(revision)
  source.short_log_message(revision)
end

#sourceObject


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# File 'lib/engineyard-serverside/deploy.rb', line 458

def source
  ensure_git_ssh_wrapper
  @source ||= config.source(shell)
end

#ssh_executableObject

create ssh wrapper on all servers


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# File 'lib/engineyard-serverside/deploy.rb', line 160

def ssh_executable
  @ssh_executable ||= begin
                        roles :app_master, :app, :solo, :util do
                          run(generate_ssh_wrapper)
                        end
                        paths.ssh_wrapper
                      end
end

task


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# File 'lib/engineyard-serverside/deploy.rb', line 426

def symlink
  shell.status "Symlinking code."
  run move_symlink(paths.active_release, paths.current, "deploying")
  ensure_ownership(paths.current)
  @symlink_changed = true
rescue Exception
  sudo move_symlink(paths.previous_release(paths.active_release), paths.current, "reverting")
  ensure_ownership(paths.current)
  @symlink_changed = false
  raise
end

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# File 'lib/engineyard-serverside/deploy.rb', line 361

def symlink_configs
  shell.status "Preparing shared resources for release."

  shell.substatus "Set group write permissions"
  run "chmod -R g+w #{paths.active_release}"

  setup_shared_tmp

  symlink_tasks.each do |what, cmd|
    shell.substatus what
    run(cmd)
  end
end

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# File 'lib/engineyard-serverside/deploy.rb', line 410

def symlink_tasks
  [
    ["Symlink shared pids directory",         "ln -nfs #{paths.shared}/pids #{paths.active_tmp}/pids"],
    ["Symlink shared log directory",          "rm -rf #{paths.active_log} && ln -nfs #{paths.shared_log} #{paths.active_log}"],
    ["Remove public/system if symlinked",     "if [ -L \"#{paths.public_system}\" ]; then rm -rf #{paths.public_system}; fi"],
    ["Create public directory",               "mkdir -p #{paths.public}"],
    ["Symlink public system directory",       "if [ ! -e \"#{paths.public_system}\" ]; then ln -ns #{paths.shared_system} #{paths.public_system}; fi"],
    ["Create config directory",               "mkdir -p #{paths.active_release_config}"],
    ["Symlink other shared config files",     "find #{paths.shared_config} -maxdepth 1 -type f -not -name 'database.yml' -exec ln -s {} #{paths.active_release_config} \\;"],
    ["Symlink database.yml if needed",        "if [ -f \"#{paths.shared_config}/database.yml\" ]; then ln -nfs #{paths.shared_config}/database.yml #{paths.active_release_config}/database.yml; fi"],
    ["Symlink newrelic.yml if needed",        "if [ -f \"#{paths.shared_config}/newrelic.yml\" ]; then ln -nfs #{paths.shared_config}/newrelic.yml #{paths.active_release_config}/newrelic.yml; fi"],
    ["Symlink mongrel_cluster.yml if needed", "if [ -f \"#{paths.shared_config}/mongrel_cluster.yml\" ]; then ln -nfs #{paths.shared_config}/mongrel_cluster.yml #{paths.active_release_config}/mongrel_cluster.yml; fi"],
  ]
end

#unchanged_diff_between_revisions?(previous_revision, active_revision, asset_dependencies) ⇒ Boolean

Returns:

  • (Boolean)

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# File 'lib/engineyard-serverside/deploy.rb', line 79

def unchanged_diff_between_revisions?(previous_revision, active_revision, asset_dependencies)
  source.same?(previous_revision, active_revision, asset_dependencies)
end

#update_repository_cacheObject


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# File 'lib/engineyard-serverside/deploy.rb', line 63

def update_repository_cache
  source.update_repository_cache
end