The ancestor class for all Capistrano SCM implementations. It provides minimal infrastructure for subclasses to build upon and override.
Note that subclasses that implement this abstract class only return the commands that need to be executed--they do not execute the commands themselves. In this way, the deployment method may execute the commands either locally or remotely, as necessary.
The options available for this SCM instance to reference. Should be treated like a hash.
If no parameters are given, it returns the current configured name of the command-line utility of this SCM. If a parameter is given, the defeault command is set to that value.
# File lib/capistrano/recipes/deploy/scm/base.rb, line 17 def default_command(value=nil) if value @default_command = value else @default_command end end
Creates a new SCM instance with the given configuration options.
# File lib/capistrano/recipes/deploy/scm/base.rb, line 44 def initialize(configuration={}) @configuration = configuration end
Checkout a copy of the repository, at the given revision, to the given destination. The checkout is suitable for doing development work in, e.g. allowing subsequent commits and updates.
# File lib/capistrano/recipes/deploy/scm/base.rb, line 87 def checkout(revision, destination) raise NotImplementedError, "`checkout' is not implemented by #{self.class.name}" end
Returns the name of the command-line utility for this SCM. It first looks at the :scm_command variable, and if it does not exist, it then falls back to whatever was defined by default_command.
If scm_command is set to :default, the default_command will be returned.
# File lib/capistrano/recipes/deploy/scm/base.rb, line 147 def command command = variable(:scm_command) command = nil if command == :default command || default_command end
Compute the difference between the two revisions, from and to.
# File lib/capistrano/recipes/deploy/scm/base.rb, line 98 def diff(from, to=nil) raise NotImplementedError, "`diff' is not implemented by #{self.class.name}" end
Should analyze the given text and determine whether or not a response is expected, and if so, return the appropriate response. If no response is expected, return nil. The state parameter is a hash that may be used to preserve state between calls. This method is used to define how Capistrano should respond to common prompts and messages from the SCM, like password prompts and such. By default, the output is simply displayed.
# File lib/capistrano/recipes/deploy/scm/base.rb, line 136 def handle_data(state, stream, text) logger.info "[#{stream}] #{text}" nil end
Returns the string used to identify the latest revision in the repository. This will be passed as the "revision" parameter of the methods below.
# File lib/capistrano/recipes/deploy/scm/base.rb, line 80 def head raise NotImplementedError, "`head' is not implemented by #{self.class.name}" end
Returns a proxy that wraps the SCM instance and forces it to operate in "local" mode, which changes how variables are looked up in the configuration. Normally, if the value of a variable "foo" is needed, it is queried for in the configuration as "foo". However, in "local" mode, first "local_foo" would be looked for, and only if it is not found would "foo" be used. This allows for both (e.g.) "scm_command" and "local_scm_command" to be set, if the two differ.
Alternatively, it may be called with a block, and for the duration of the block, all requests on this configuration object will be considered local.
# File lib/capistrano/recipes/deploy/scm/base.rb, line 59 def local if block_given? begin saved, @local_mode = @local_mode, true yield ensure @local_mode = saved end else LocalProxy.new(self) end end
Returns true if running in "local" mode. See local.
# File lib/capistrano/recipes/deploy/scm/base.rb, line 73 def local? @local_mode end
Return a log of all changes between the two specified revisions, from and to, inclusive.
# File lib/capistrano/recipes/deploy/scm/base.rb, line 104 def log(from, to=nil) raise NotImplementedError, "`log' is not implemented by #{self.class.name}" end
Returns the revision number immediately following revision, if at all possible. A block should always be passed to this method, which accepts a command to invoke and returns the result, although a particular SCM's implementation is not required to invoke the block.
By default, this method simply returns the revision itself. If a particular SCM is able to determine a subsequent revision given a revision identifier, it should override this method.
# File lib/capistrano/recipes/deploy/scm/base.rb, line 125 def next_revision(revision) revision end
If the given revision represents a "real" revision, this should simply return the revision value. If it represends a pseudo-revision (like Subversions "HEAD" identifier), it should yield a string containing the commands that, when executed will return a string that this method can then extract the real revision from.
# File lib/capistrano/recipes/deploy/scm/base.rb, line 113 def query_revision(revision) raise NotImplementedError, "`query_revision' is not implemented by #{self.class.name}" end
A helper method that can be used to define SCM commands naturally. It returns a single string with all arguments joined by spaces, with the scm command prefixed onto it.
# File lib/capistrano/recipes/deploy/scm/base.rb, line 156 def scm(*args) [command, *args].compact.join(" ") end
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