/usr/lib/ruby/vendor_ruby/merb-core/server.rb is in ruby-merb-core 1.1.3+dfsg-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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module Merb
# Server encapsulates the management of Merb daemons.
class Server
class << self
# Start a Merb server, in either foreground, daemonized or cluster mode.
#
# ==== Parameters
# port<~to_i>::
# The port to which the first server instance should bind to.
# Subsequent server instances bind to the immediately following ports.
# cluster<~to_i>::
# Number of servers to run in a cluster.
#
# ==== Alternatives
# If cluster is left out, then one process will be started. This process
# will be daemonized if Merb::Config[:daemonize] is true.
#
# :api: private
def start(port, cluster=nil)
@port = port
@cluster = cluster
if Merb::Config[:daemonize]
pidfile = pid_file(port)
pid = File.read(pidfile).chomp.to_i if File.exist?(pidfile)
unless alive?(@port)
remove_pid_file(@port)
Merb.logger.warn! "Daemonizing..." if Merb::Config[:verbose]
daemonize(@port)
else
Merb.fatal! "Merb is already running on port #{port}.\n" \
"\e[0m \e[1;31;47mpid file: \e[34;47m#{pidfile}" \
"\e[1;31;47m, process id is \e[34;47m#{pid}."
end
else
bootup
end
end
# ==== Parameters
# port<~to_s>:: The port to check for Merb instances on.
#
# ==== Returns
# Boolean::
# True if Merb is running on the specified port.
#
# :api: private
def alive?(port)
pidfile = pid_file(port)
pid = pid_in_file(pidfile)
Process.kill(0, pid)
true
rescue Errno::ESRCH, Errno::ENOENT
false
rescue Errno::EACCES => e
Merb.fatal!("You don't have access to the PID file at #{pidfile}: #{e.message}")
end
# :api: private
def pid_in_file(pidfile)
File.read(pidfile).chomp.to_i
end
# ==== Parameters
# port<~to_s>:: The port of the Merb process to kill.
# sig<~to_s>:: The signal to send to the process, the default is 9 - SIGKILL.
#
# No Name Default Action Description
# 1 SIGHUP terminate process terminal line hangup
# 2 SIGINT terminate process interrupt program
# 3 SIGQUIT create core image quit program
# 4 SIGILL create core image illegal instruction
# 9 SIGKILL terminate process kill program
# 15 SIGTERM terminate process software termination signal
# 30 SIGUSR1 terminate process User defined signal 1
# 31 SIGUSR2 terminate process User defined signal 2
#
# ==== Alternatives
# If you pass "all" as the port, the signal will be sent to all Merb processes.
#
# :api: private
def kill(port, sig = "INT")
if sig.is_a?(Integer)
sig = Signal.list.invert[sig]
end
Merb::BootLoader::BuildFramework.run
# If we kill the master, then the workers should be reaped also.
if %w(main master all).include?(port)
# If a graceful exit is requested then send INT to the master process.
#
# Otherwise read pids from pid files and try to kill each process in turn.
kill_pid(sig, pid_file("main")) if sig == "INT"
else
kill_pid(sig, pid_file(port))
end
end
# Sends the provided signal to the process pointed at by the provided pid file.
# :api: private
def kill_pid(sig, file)
begin
pid = pid_in_file(file)
Merb.logger.fatal! "Killing pid #{pid} with #{sig}"
Process.kill(sig, pid)
FileUtils.rm(file) if File.exist?(file)
rescue Errno::EINVAL
Merb.logger.fatal! "Failed to kill PID #{pid} with #{sig}: '#{sig}' is an invalid " \
"or unsupported signal number."
rescue Errno::EPERM
Merb.logger.fatal! "Failed to kill PID #{pid} with #{sig}: Insufficient permissions."
rescue Errno::ESRCH
FileUtils.rm file
Merb.logger.fatal! "Failed to kill PID #{pid} with #{sig}: Process is " \
"deceased or zombie."
rescue Errno::EACCES => e
Merb.logger.fatal! e.message
rescue Errno::ENOENT => e
# This should not cause abnormal exit, which is why
# we do not use Merb.fatal but instead just log with max level.
Merb.logger.fatal! "Could not find a PID file at #{file}. " \
"Most likely the process is no longer running and the pid file was not cleaned up."
rescue Exception => e
if !e.is_a?(SystemExit)
Merb.logger.fatal! "Failed to kill PID #{pid.inspect} with #{sig.inspect}: #{e.message}"
end
end
end
# ==== Parameters
# port<~to_s>:: The port of the Merb process to daemonize.
#
# :api: private
def daemonize(port)
Merb.logger.warn! "About to fork..." if Merb::Config[:verbose]
fork do
Process.setsid
exit if fork
Merb.logger.warn! "In #{Process.pid}" if Merb.logger
File.umask 0000
STDIN.reopen "/dev/null"
STDOUT.reopen "/dev/null", "a"
STDERR.reopen STDOUT
begin
Dir.chdir Merb::Config[:merb_root]
rescue Errno::EACCES => e
Merb.fatal! "You specified Merb root as #{Merb::Config[:merb_root]}, " \
"yet the current user does not have access to it. ", e
end
at_exit { remove_pid_file(port) }
Merb::Config[:port] = port
bootup
end
rescue NotImplementedError => e
Merb.fatal! "Daemonized mode is not supported on your platform. ", e
end
# Starts up Merb by running the bootloader and starting the adapter.
#
# :api: private
def bootup
Merb.trap("TERM") { shutdown }
Merb.logger.warn! "Running bootloaders..." if Merb::Config[:verbose]
BootLoader.run
Merb.logger.warn! "Starting Rack adapter..." if Merb::Config[:verbose]
Merb.adapter.start(Merb::Config.to_hash)
end
# Shut down Merb, reap any workers if necessary.
#
# :api: private
def shutdown(status = 0)
# reap_workers does exit but may not be called...
Merb::BootLoader::LoadClasses.reap_workers(status) if Merb::Config[:fork_for_class_load]
# which is why we exit explicitly here
exit(status)
end
# Change process user/group to those specified in Merb::Config.
#
# :api: private
def change_privilege
if Merb::Config[:user] && Merb::Config[:group]
Merb.logger.verbose! "About to change privilege to group " \
"#{Merb::Config[:group]} and user #{Merb::Config[:user]}"
_change_privilege(Merb::Config[:user], Merb::Config[:group])
elsif Merb::Config[:user]
Merb.logger.verbose! "About to change privilege to user " \
"#{Merb::Config[:user]}"
_change_privilege(Merb::Config[:user])
else
return true
end
end
# Removes a PID file used by the server from the filesystem.
# This uses :pid_file options from configuration when provided
# or merb.<port/socket>.pid in log directory by default.
#
# ==== Parameters
# port<~to_s>::
# The port of the Merb process to whom the the PID file belongs to.
#
# ==== Alternatives
# If Merb::Config[:pid_file] has been specified, that will be used
# instead of the port/socket based PID file.
#
# :api: private
def remove_pid_file(port)
pidfile = pid_file(port)
if File.exist?(pidfile)
Merb.logger.warn! "Removing pid file #{pidfile} (port/socket: #{port})..."
FileUtils.rm(pidfile)
end
end
# Stores a PID file on the filesystem.
# This uses :pid_file options from configuration when provided
# or merb.<port>.pid in log directory by default.
#
# ==== Parameters
# port<~to_s>::
# The port of the Merb process to whom the the PID file belongs to.
#
# ==== Alternatives
# If Merb::Config[:pid_file] has been specified, that will be used
# instead of the port/socket based PID file.
#
# :api: private
def store_pid(port)
store_details(port)
end
# Delete the pidfile for the specified port/socket.
#
# :api: private
def remove_pid(port)
FileUtils.rm(pid_file(port)) if File.file?(pid_file(port))
end
# Stores a PID file on the filesystem.
# This uses :pid_file options from configuration when provided
# or merb.<port/socket>.pid in log directory by default.
#
# ==== Parameters
# port<~to_s>::
# The port of the Merb process to whom the the PID file belongs to.
#
# ==== Alternatives
# If Merb::Config[:pid_file] has been specified, that will be used
# instead of the port/socket based PID file.
#
# :api: private
def store_details(port = nil)
file = pid_file(port)
begin
FileUtils.mkdir_p(File.dirname(file))
rescue Errno::EACCES => e
Merb.fatal! "Failed to store Merb logs in #{File.dirname(file)}, " \
"permission denied. ", e
end
Merb.logger.warn! "Storing pid #{Process.pid} file to #{file}..." if Merb::Config[:verbose]
begin
File.open(file, 'w'){ |f| f.write(Process.pid.to_s) }
rescue Errno::EACCES => e
Merb.fatal! "Failed to access #{file}, permission denied.", e
end
end
# Gets the pid file for the specified port/socket.
#
# ==== Parameters
# port<~to_s>::
# The port/socket of the Merb process to whom the the PID file belongs to.
#
# ==== Returns
# String::
# Location of pid file for specified port. If clustered and pid_file option
# is specified, it adds the port/socket value to the path.
#
# :api: private
def pid_file(port)
pidfile = Merb::Config[:pid_file] || (Merb.log_path / "merb.%s.pid")
pidfile % port
end
# Get a list of the pid files.
#
# ==== Returns
# Array::
# List of pid file paths. If not running clustered, the array contains a single path.
#
# :api: private
def pid_files
if Merb::Config[:pid_file]
if Merb::Config[:cluster]
Dir[Merb::Config[:pid_file] % "*"]
else
[ Merb::Config[:pid_file] ]
end
else
Dir[Merb.log_path / "merb.*.pid"]
end
end
# Change privileges of the process to the specified user and group.
#
# ==== Parameters
# user<String>:: The user to change the process to.
# group<String>:: The group to change the process to.
#
# ==== Alternatives
# If group is left out, the user will be used as the group.
#
# :api: private
def _change_privilege(user, group=user)
Merb.logger.warn! "Changing privileges to #{user}:#{group}"
uid, gid = Process.euid, Process.egid
begin
target_uid = Etc.getpwnam(user).uid
rescue ArgumentError => e
Merb.fatal!("Failed to change to user #{user}, does the user exist?", e)
return false
end
begin
target_gid = Etc.getgrnam(group).gid
rescue ArgumentError => e
Merb.fatal!("Failed to change to group #{group}, does the group exist?", e)
return false
end
if (uid != target_uid) || (gid != target_gid)
# Change process ownership
Process.initgroups(user, target_gid)
Process::GID.change_privilege(target_gid)
Process::UID.change_privilege(target_uid)
end
true
rescue Errno::EPERM => e
Merb.fatal! "Permission denied for changing user:group to #{user}:#{group}.", e
false
end
# Add trap to enter IRB on SIGINT. Process exit if second SIGINT is received.
#
# :api: private
def add_irb_trap
Merb.trap("INT") do
if @interrupted
Merb.logger.warn! "Interrupt received a second time, exiting!\n"
exit
end
@interrupted = true
Merb.logger.warn! "Interrupt a second time to quit."
Kernel.sleep 1.5
ARGV.clear # Avoid passing args to IRB
if @irb.nil?
require "irb"
IRB.setup(nil)
@irb = IRB::Irb.new(nil)
IRB.conf[:MAIN_CONTEXT] = @irb.context
end
Merb.trap(:INT) { @irb.signal_handle }
catch(:IRB_EXIT) { @irb.eval_input }
Merb.logger.warn! "Exiting from IRB mode back into server mode."
@interrupted = false
add_irb_trap
end
end
end
end
end
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