内置capistrano变量

Question

有人知道所有内置Capistrano变量的列表，比如current_path等吗？

Answer 1

您可以在以下网址找到所有这些内容：

https://github.com/capistrano/capistrano/blob/legacy-v2/lib/capistrano/recipes/deploy.rb

更新：v3不再具有与v2相同的配置选项。我链接了上面的v2配置选项，但v3具有以下内容：

以下是遗留在这篇文章中的遗留内容：

# =========================================================================
# These variables MUST be set in the client capfiles. If they are not set,
# the deploy will fail with an error.
# =========================================================================

_cset(:application) { abort "Please specify the name of your application, set :application, 'foo'" }
_cset(:repository)  { abort "Please specify the repository that houses your application's code, set :repository, 'foo'" }

# =========================================================================
# These variables may be set in the client capfile if their default values
# are not sufficient.
# =========================================================================

_cset(:scm) { scm_default }
_cset :deploy_via, :checkout

_cset(:deploy_to) { "/u/apps/#{application}" }
_cset(:revision)  { source.head }

_cset :rails_env, "production"
_cset :rake, "rake"

# =========================================================================
# These variables should NOT be changed unless you are very confident in
# what you are doing. Make sure you understand all the implications of your
# changes if you do decide to muck with these!
# =========================================================================

_cset(:source)            { Capistrano::Deploy::SCM.new(scm, self) }
_cset(:real_revision)     { source.local.query_revision(revision) { |cmd| with_env("LC_ALL", "C") { run_locally(cmd) } } }

_cset(:strategy)          { Capistrano::Deploy::Strategy.new(deploy_via, self) }

# If overriding release name, please also select an appropriate setting for :releases below.
_cset(:release_name)      { set :deploy_timestamped, true; Time.now.utc.strftime("%Y%m%d%H%M%S") }

_cset :version_dir,       "releases"
_cset :shared_dir,        "shared"
_cset :shared_children,   %w(public/system log tmp/pids)
_cset :current_dir,       "current"

_cset(:releases_path)     { File.join(deploy_to, version_dir) }
_cset(:shared_path)       { File.join(deploy_to, shared_dir) }
_cset(:current_path)      { File.join(deploy_to, current_dir) }
_cset(:release_path)      { File.join(releases_path, release_name) }

_cset(:releases)          { capture("#{try_sudo} ls -x #{releases_path}", :except => { :no_release => true }).split.sort }
_cset(:current_release)   { releases.length > 0 ? File.join(releases_path, releases.last) : nil }
_cset(:previous_release)  { releases.length > 1 ? File.join(releases_path, releases[-2]) : nil }

_cset(:current_revision)  { capture("#{try_sudo} cat #{current_path}/REVISION",     :except => { :no_release => true }).chomp }
_cset(:latest_revision)   { capture("#{try_sudo} cat #{current_release}/REVISION",  :except => { :no_release => true }).chomp }
_cset(:previous_revision) { capture("#{try_sudo} cat #{previous_release}/REVISION", :except => { :no_release => true }).chomp if previous_release }

_cset(:run_method)        { fetch(:use_sudo, true) ? :sudo : :run }

# some tasks, like symlink, need to always point at the latest release, but
# they can also (occassionally) be called standalone. In the standalone case,
# the timestamped release_path will be inaccurate, since the directory won't
# actually exist. This variable lets tasks like symlink work either in the
# standalone case, or during deployment.
_cset(:latest_release) { exists?(:deploy_timestamped) ? release_path : current_release }

_cset :maintenance_basename, "maintenance"
_cset(:maintenance_template_path) { File.join(File.dirname(__FILE__), "templates", "maintenance.rhtml") }

Answer 2

似乎第3章已将默认值分散到多个文件中。这是我的重建基于从Cap 3主分支中的发布链接搜索Cap 2默认值：

• https://github.com/capistrano/capistrano/blob/ee96c2e77a57c8facf52854eb14d6b57b2b0e5e7/lib/capistrano/defaults.rb
• https://github.com/capistrano/capistrano/blob/aeab6b6a1e5c5e654f35321dcd7438a0659864d0/lib/capistrano/dsl/paths.rb

从第二个链接可以看到V2中的一些变量现在转换为读者方法（这意味着你不需要fetch个）：

• deploy_to
• deploy_path
• 的current_path
• releases_path
• release_path
• stage_config_path
• deploy_config_path
• repo_url
• repo_path
• shared_pa​​th
• revision_log
• 现在
• asset_timestamp