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Contents
module Quebert
module Support
# Deal with all of our pid file stuff
class PidFile
attr_reader :path
ProcessRunning = Class.new(RuntimeError)
def initialize(path)
@path = path
end
def write!
remove_stale and write
end
# Read pids and turn them into ints
def self.read(file)
if File.file?(file) && pid = File.read(file)
pid.to_i
else
nil
end
end
# Tells us if a current process is running
def self.running?(pid)
Process.getpgid(pid) != -1
rescue Errno::EPERM
true
rescue Errno::ESRCH
false
end
private
# If PID file is stale, remove it.
def remove_stale
if exists? && running?
raise ProcessRunning, "#{path} already exists, seems like it's already running (process ID: #{pid}). " +
"Stop the process or delete #{path}."
else
remove
end
end
def remove
File.delete(path) if exists?
true
end
def write
File.open(path,"w") { |f| f.write(Process.pid) }
File.chmod(0644, path)
end
def pid
self.class.read(path)
end
def running?
self.class.running?(pid)
end
def exists?
File.exist?(path)
end
end
end
end
Version data entries
29 entries across 29 versions & 1 rubygems