Module: Cast

Defined in:
lib/cast.rb

Constant Summary collapse

VERSION = 
'0.1.5'
DEFAULTGROUPS = 
'~/.cast.yml'
@@mux = 
Mutex.new
@@pids = 
[]
@@groups = 
nil

Class Method Summary collapse

Class Method Details

.ensure_local(cmd, prefix = nil) ⇒ Object 



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# File 'lib/cast.rb', line 74

def self.ensure_local cmd, prefix = nil
  r = local cmd, prefix
  raise "command failed: #{cmd}" unless r == 0
  return r
end

.expand_groups(cmdgroups, groups = @@groups) ⇒ Object 



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# File 'lib/cast.rb', line 41

def self.expand_groups cmdgroups, groups = @@groups
  hosts = []
  cmdgroups.each do |group|
    if groups.include? group
      hosts += groups[group]
    else
      hosts << group
    end
  end

  return hosts.uniq
end

.load_groups(groupfile) ⇒ Object 



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# File 'lib/cast.rb', line 25

def self.load_groups groupfile
  file = File.expand_path groupfile
  exists = File.exists? file
  @@groups ||= {}

  if !exists
    raise "could not find #{groupfile}" if groupfile != DEFAULTGROUPS
    log "no group file found at #{groupfile}"
  else
    log "loading groups from #{groupfile}"
    @@groups = YAML.load_file file
  end

  return @@groups
end

.local(cmd, options = {}) ⇒ Object 



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# File 'lib/cast.rb', line 80

def self.local cmd, options = {}
  prefix = nil

  if options.is_a? String
    prefix = options # this is for backwards compatibility
  elsif options[:prefix]
    prefix = options[:prefix]
  end

  r = nil

  blk = Proc.new do |stdin, stdout, stderr, wait_thr|
    @@pids << wait_thr.pid
    stdin.close

    while wait_thr.status
      streams = []
      streams << stdout if stdout
      streams << stderr if stderr
      break unless streams.size > 0

      ios = IO.select streams

      ios.first.each do |stream|
        if stream == stdout
          line = stream.gets
          if line == nil
            stdout.close
            stdout = nil
            next
          end
          log line, prefix

        elsif stream == stderr
          line = stream.gets
          if line == nil
            stderr.close
            stderr = nil
            next
          end
          log line, prefix, $stderr

        else raise "unrecognized stream #{stream}"
        end
      end
    end

    r = wait_thr.value
  end

  if options[:clean_bundler_env]
    Bundler.with_clean_env do
      Open3.popen3(cmd, &blk)
    end
  else
    Open3.popen3(cmd, &blk)
  end

  if options[:ensure]
    unless r.exitstatus == 0
      raise "command failed: #{cmd}"
    end
  end

  return r.exitstatus
end

.log(msg, source = 'cast', stream = $stdout) ⇒ Object 



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# File 'lib/cast.rb', line 18

def self.log msg, source = 'cast', stream = $stdout
  @@mux.synchronize do
    prefix = "[#{source}] " unless source == nil
    stream.puts "#{prefix}#{msg}"
  end
end

.remote(host, cmd, ssh = 'ssh') ⇒ Object 



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# File 'lib/cast.rb', line 68

def self.remote host, cmd, ssh = 'ssh'
  fullcmd = "#{ssh} #{host} '#{cmd}'"
  log "running #{fullcmd}"
  local fullcmd, host
end

.run(hosts, cmd, serial = false, delay = nil, ssh = 'ssh') ⇒ Object 



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# File 'lib/cast.rb', line 54

def self.run hosts, cmd, serial = false, delay = nil, ssh = 'ssh'
  if serial or delay
    hosts.each_with_index do |host, i|
      remote host, cmd, ssh
      if delay and i < hosts.size - 1
        log "delay for #{delay} seconds"
        sleep delay
      end
    end
  else
    hosts.peach { |host| remote host, cmd, ssh }
  end
end