Module: DockerPid::Host

Defined in:
lib/docker_pid.rb

Class Method Summary collapse

Class Method Details

.docker_container_id(pid) ⇒ Object

Raises:



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# File 'lib/docker_pid.rb', line 31

def self.docker_container_id(pid)
  cg = proc_cgroup(pid)
  m = cg.match(/\/docker\/(.+?)(\/|\n)/m)
  raise NotDockerProcess.new("PID: #{pid}") if m.nil?
  m[1]
end

.exist_process?(pid) ⇒ Boolean 



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# File 'lib/docker_pid.rb', line 12

def self.exist_process?(pid)
  begin
    Process.getpgid(pid)
    true
  rescue Errno::ESRCH
    false
  end
end

.proc_cgroup(pid) ⇒ Object 



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# File 'lib/docker_pid.rb', line 21

def self.proc_cgroup(pid)
  begin
    p = Integer(pid)
    raise unless exist_process?(p)
  rescue => e
    raise ProcessNotExist.new("PID: #{pid}")
  end
  File.read("/proc/#{pid}/cgroup")
end