Class: SSHKit::Backend::Abstract

Inherits:
Object
  • Object
show all
Extended by:
Forwardable
Defined in:
lib/sshkit/backends/abstract.rb

Direct Known Subclasses

Local, Netssh, Printer, Skipper

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(host, &block) ⇒ Abstract

Returns a new instance of Abstract.



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# File 'lib/sshkit/backends/abstract.rb', line 34

def initialize(host, &block)
  raise "Must pass a Host object" unless host.is_a? Host
  @host  = host
  @block = block

  @pwd   = nil
  @env   = nil
  @user  = nil
  @group = nil
end

Instance Attribute Details

#host ⇒ Object (readonly)

Returns the value of attribute host.



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# File 'lib/sshkit/backends/abstract.rb', line 25

def host
  @host
end

Class Method Details

.config ⇒ Object 



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# File 'lib/sshkit/backends/abstract.rb', line 119

def config
  @config ||= OpenStruct.new
end

.configure {|config| ... } ⇒ Object

Yields:



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# File 'lib/sshkit/backends/abstract.rb', line 123

def configure
  yield config
end

Instance Method Details

#as(who, &_block) ⇒ Object 



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# File 'lib/sshkit/backends/abstract.rb', line 98

def as(who, &_block)
  if who.is_a? Hash
    @user  = who[:user]  || who["user"]
    @group = who[:group] || who["group"]
  else
    @user  = who
    @group = nil
  end
  execute <<-EOTEST, verbosity: Logger::DEBUG
    if ! sudo -u #{@user} whoami > /dev/null
      then echo "You cannot switch to user '#{@user}' using sudo, please check the sudoers file" 1>&2
      false
    fi
  EOTEST
  yield
ensure
  remove_instance_variable(:@user)
  remove_instance_variable(:@group)
end

#background(*args) ⇒ Object 



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# File 'lib/sshkit/backends/abstract.rb', line 64

def background(*args)
  SSHKit.config.deprecation_logger.log(
    'The background method is deprecated. Blame badly behaved pseudo-daemons!'
  )
  options = args.extract_options!.merge(run_in_background: true)
  create_command_and_execute(args, options).success?
end

#capture(*args) ⇒ Object 



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# File 'lib/sshkit/backends/abstract.rb', line 58

def capture(*args)
  options = { verbosity: Logger::DEBUG, strip: true }.merge(args.extract_options!)
  result = create_command_and_execute(args, options).full_stdout
  options[:strip] ? result.strip : result
end

#download!(_remote, _local = nil, _options = {}) ⇒ Object

Raises:



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# File 'lib/sshkit/backends/abstract.rb', line 130

def download!(_remote, _local=nil, _options = {}) raise MethodUnavailableError end

#execute(*args) ⇒ Object 



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# File 'lib/sshkit/backends/abstract.rb', line 72

def execute(*args)
  options = args.extract_options!
  create_command_and_execute(args, options).success?
end

#make(commands = []) ⇒ Object 



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# File 'lib/sshkit/backends/abstract.rb', line 45

def make(commands=[])
  execute :make, commands
end

#rake(commands = []) ⇒ Object 



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# File 'lib/sshkit/backends/abstract.rb', line 49

def rake(commands=[])
  execute :rake, commands
end

#run ⇒ Object 



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# File 'lib/sshkit/backends/abstract.rb', line 27

def run
  Thread.current["sshkit_backend"] = self
  instance_exec(@host, &@block)
ensure
  Thread.current["sshkit_backend"] = nil
end

#test(*args) ⇒ Object 



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# File 'lib/sshkit/backends/abstract.rb', line 53

def test(*args)
  options = args.extract_options!.merge(raise_on_non_zero_exit: false, verbosity: Logger::DEBUG)
  create_command_and_execute(args, options).success?
end

#upload!(_local, _remote, _options = {}) ⇒ Object

Backends which extend the Abstract backend should implement the following methods:

Raises:



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# File 'lib/sshkit/backends/abstract.rb', line 129

def upload!(_local, _remote, _options = {}) raise MethodUnavailableError end

#with(environment, &_block) ⇒ Object 



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# File 'lib/sshkit/backends/abstract.rb', line 90

def with(environment, &_block)
  env_old = (@env ||= {})
  @env = env_old.merge environment
  yield
ensure
  @env = env_old
end

#within(directory, &_block) ⇒ Object 



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# File 'lib/sshkit/backends/abstract.rb', line 77

def within(directory, &_block)
  (@pwd ||= []).push directory.to_s
  execute <<-EOTEST, verbosity: Logger::DEBUG
    if test ! -d #{File.join(@pwd)}
      then echo "Directory does not exist '#{File.join(@pwd)}'" 1>&2
      false
    fi
    EOTEST
    yield
ensure
  @pwd.pop
end