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require 'tempfile'
module Byteback
module Util
@@lockfile = "/var/run/byteback/byteback.lock"
def remove_lockfile!
begin
File.unlink(@@lockfile)
rescue Errno::ENOENT
end
end
def claim_lockfile!
# Check the lockfile first
if File.directory?(File.dirname(@@lockfile))
if File.exists? @@lockfile
# check the lockfile is sane
exist_pid = File.read(@@lockfile).to_i
if exist_pid > 1 and exist_pid < (File.read("/proc/sys/kernel/pid_max").to_i)
begin
Process.getpgid(exist_pid)
# if no exception, process is running, abort
fatal("Process is running (#{exist_pid} from #{@@lockfile})")
rescue Errno::ESRCH
# no process running with that pid, pidfile is stale
remove_lockfile!
end
else
# lockfile isn't sane, remove it and continue
remove_lockfile!
end
end
else
Dir.mkdir(File.dirname(@@lockfile))
# lockfile didn't exist so just carry on
end
# Own the pidfile ourselves
File.open(@@lockfile, "w") do |lockfile|
lockfile.puts Process::pid
end
end
def lock_out_other_processes(name)
@@lockfile = "/var/run/byteback/#{name}.lock"
claim_lockfile!
at_exit { remove_lockfile! }
end
def log_system(*args)
debug("system: " + args.map { |a| / /.match(a) ? "\"#{a}\"" : a }.join(" "))
rd, wr = IO.pipe
pid = fork
if pid.nil? # child
rd.close
STDOUT.reopen(wr)
STDERR.reopen(wr)
# any cleanup actually necessary here?
exec(*args)
end
wr.close
rd.each_line { |line| debug(line.chomp) }
pid2, status = Process.waitpid2(pid, 0)
status.exitstatus
end
end
end
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