Class: Capistrano::Deploy::SCM::Git

Inherits:
Base
  • Object
show all
Defined in:
lib/capistrano/recipes/deploy/scm/git.rb

Overview

An SCM module for using Git as your source control tool with Capistrano 2.0. If you are using Capistrano 1.x, use this plugin instead:

http://scie.nti.st/2007/3/16/capistrano-with-git-shared-repository

Assumes you are using a shared Git repository.

Parts of this plugin borrowed from Scott Chacon’s version, which I found on the Capistrano mailing list but failed to be able to get working.

FEATURES:

* Very simple, only requiring 2 lines in your deploy.rb.
* Can deploy different branches, tags, or any SHA1 easily.
* Supports prompting for password / passphrase upon checkout.
  (I am amazed at how some plugins don't do this)
* Supports :scm_command, :scm_password, :scm_passphrase Capistrano
  directives.

CONFIGURATION


Use this plugin by adding the following line in your config/deploy.rb:

set :scm, :git

Set :repository to the path of your Git repo:

set :repository, "someuser@somehost:/home/myproject"

The above two options are required to be set, the ones below are optional.

You may set :branch, which is the reference to the branch, tag, or any SHA1 you are deploying, for example:

set :branch, "master"

Otherwise, HEAD is assumed. I strongly suggest you set this. HEAD is not always the best assumption.

You may also set :remote, which will be used as a name for remote tracking of repositories. This option is intended for use with the :remote_cache strategy in a distributed git environment.

For example in the projects config/deploy.rb:

set :repository, "#{scm_user}@somehost:~/projects/project.git"
set :remote, "#{scm_user}"

Then each person with deploy priveledges can add the following to their local ~/.caprc file:

set :scm_user, 'someuser'

Now any time a person deploys the project, their repository will be setup as a remote git repository within the cached repository.

The :scm_command configuration variable, if specified, will be used as the full path to the git executable on the remote machine:

set :scm_command, "/opt/local/bin/git"

For compatibility with deploy scripts that may have used the 1.x version of this plugin before upgrading, :git is still recognized as an alias for :scm_command.

Set :scm_password to the password needed to clone your repo if you don’t have password-less (public key) entry:

set :scm_password, "my_secret'

Otherwise, you will be prompted for a password.

:scm_passphrase is also supported.

The remote cache strategy is also supported.

set :repository_cache, "git_master"
set :deploy_via, :remote_cache

For faster clone, you can also use shallow cloning. This will set the ‘–depth’ flag using the depth specified. This cannot be used together with the :remote_cache strategy

set :git_shallow_clone, 1

For those that don’t like to leave your entire repository on your production server you can:

set :deploy_via, :export

To deploy from a local repository:

set :repository, "file://."
set :deploy_via, :copy

AUTHORS


Garry Dolley scie.nti.st Contributions by Geoffrey Grosenbach topfunky.com

Scott Chacon http://jointheconversation.org
            Alex Arnell http://twologic.com
                     and Phillip Goldenburg

Instance Attribute Summary

Attributes inherited from Base

#configuration

Instance Method Summary collapse

Methods inherited from Base

default_command, #initialize, #local, #local?, #next_revision, #scm

Constructor Details

This class inherits a constructor from Capistrano::Deploy::SCM::Base

Instance Method Details

#checkout(revision, destination) ⇒ Object

Performs a clone on the remote machine, then checkout on the branch you want to deploy.



132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
# File 'lib/capistrano/recipes/deploy/scm/git.rb', line 132

def checkout(revision, destination)
  git    = command
  remote = origin

  args = []
  args << "-o #{remote}" unless remote == 'origin'
  if depth = variable(:git_shallow_clone)
    args << "--depth #{depth}"
  end

  execute = []
  execute << "#{git} clone #{verbose} #{args.join(' ')} #{variable(:repository)} #{destination}"

  # checkout into a local branch rather than a detached HEAD
  execute << "cd #{destination} && #{git} checkout #{verbose} -b deploy #{revision}"
  
  if variable(:git_enable_submodules)
    execute << "#{git} submodule #{verbose} init"
    execute << "#{git} submodule #{verbose} sync"
    execute << "#{git} submodule #{verbose} update --recursive"
  end

  execute.join(" && ")
end

#commandObject



231
232
233
234
# File 'lib/capistrano/recipes/deploy/scm/git.rb', line 231

def command
  # For backwards compatibility with 1.x version of this module
  variable(:git) || super
end

#diff(from, to = nil) ⇒ Object

Returns a string of diffs between two revisions



201
202
203
204
# File 'lib/capistrano/recipes/deploy/scm/git.rb', line 201

def diff(from, to=nil)
  from << "..#{to}" if to
  scm :diff, from
end

#export(revision, destination) ⇒ Object

An expensive export. Performs a checkout as above, then removes the repo.



159
160
161
# File 'lib/capistrano/recipes/deploy/scm/git.rb', line 159

def export(revision, destination)
  checkout(revision, destination) << " && rm -Rf #{destination}/.git"
end

#handle_data(state, stream, text) ⇒ Object

Determines what the response should be for a particular bit of text from the SCM. Password prompts, connection requests, passphrases, etc. are handled here.



239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
# File 'lib/capistrano/recipes/deploy/scm/git.rb', line 239

def handle_data(state, stream, text)
  host = state[:channel][:host]
  logger.info "[#{host} :: #{stream}] #{text}"
  case text
  when /\bpassword.*:/i
    # git is prompting for a password
    unless pass = variable(:scm_password)
      pass = Capistrano::CLI.password_prompt
    end
    "#{pass}\n"
  when %r{\(yes/no\)}
    # git is asking whether or not to connect
    "yes\n"
  when /passphrase/i
    # git is asking for the passphrase for the user's key
    unless pass = variable(:scm_passphrase)
      pass = Capistrano::CLI.password_prompt
    end
    "#{pass}\n"
  when /accept \(t\)emporarily/
    # git is asking whether to accept the certificate
    "t\n"
  end
end

#headObject

When referencing “head”, use the branch we want to deploy or, by default, Git’s reference of HEAD (the latest changeset in the default branch, usually called “master”).



122
123
124
# File 'lib/capistrano/recipes/deploy/scm/git.rb', line 122

def head
  variable(:branch) || 'HEAD'
end

#log(from, to = nil) ⇒ Object

Returns a log of changes between the two revisions (inclusive).



207
208
209
# File 'lib/capistrano/recipes/deploy/scm/git.rb', line 207

def log(from, to=nil)
  scm :log, "#{from}..#{to}"
end

#originObject



126
127
128
# File 'lib/capistrano/recipes/deploy/scm/git.rb', line 126

def origin
  variable(:remote) || 'origin'
end

#query_revision(revision) ⇒ Object

Getting the actual commit id, in case we were passed a tag or partial sha or something - it will return the sha if you pass a sha, too

Raises:

  • (ArgumentError)


213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
# File 'lib/capistrano/recipes/deploy/scm/git.rb', line 213

def query_revision(revision)
  raise ArgumentError, "Deploying remote branches is no longer supported.  Specify the remote branch as a local branch for the git repository you're deploying from (ie: '#{revision.gsub('origin/', '')}' rather than '#{revision}')." if revision =~ /^origin\//
  return revision if revision =~ /^[0-9a-f]{40}$/
  command = scm('ls-remote', repository, revision)
  result = yield(command)
  revdata = result.split(/[\t\n]/)
  newrev = nil
  revdata.each_slice(2) do |refs|
    rev, ref = *refs
    if ref.sub(/refs\/.*?\//, '').strip == revision.to_s
      newrev = rev
      break
    end
  end
  raise "Unable to resolve revision for '#{revision}' on repository '#{repository}'." unless newrev =~ /^[0-9a-f]{40}$/
  return newrev
end

#sync(revision, destination) ⇒ Object

Merges the changes to ‘head’ since the last fetch, for remote_cache deployment strategy



165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
# File 'lib/capistrano/recipes/deploy/scm/git.rb', line 165

def sync(revision, destination)
  git     = command
  remote  = origin

  execute = []
  execute << "cd #{destination}"

  # Use git-config to setup a remote tracking branches. Could use
  # git-remote but it complains when a remote of the same name already
  # exists, git-config will just silenty overwrite the setting every
  # time. This could cause wierd-ness in the remote cache if the url
  # changes between calls, but as long as the repositories are all
  # based from each other it should still work fine.
  if remote != 'origin'
    execute << "#{git} config remote.#{remote}.url #{variable(:repository)}"
    execute << "#{git} config remote.#{remote}.fetch +refs/heads/*:refs/remotes/#{remote}/*"
  end

  # since we're in a local branch already, just reset to specified revision rather than merge
  execute << "#{git} fetch #{verbose} #{remote} && #{git} reset #{verbose} --hard #{revision}"

  if variable(:git_enable_submodules)
    execute << "#{git} submodule #{verbose} init"
    execute << "for mod in `#{git} submodule status | awk '{ print $2 }'`; do #{git} config -f .git/config submodule.${mod}.url `#{git} config -f .gitmodules --get submodule.${mod}.url` && echo Synced $mod; done"
    execute << "#{git} submodule #{verbose} sync"
    execute << "#{git} submodule #{verbose} update"
  end

  # Make sure there's nothing else lying around in the repository (for
  # example, a submodule that has subsequently been removed).
  execute << "#{git} clean #{verbose} -d -x -f"

  execute.join(" && ")
end