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require 'tempfile'
module Byteback
module Util
@@lockfile = '/var/lock/byteback/byteback.lock'
def remove_lockfile!
File.unlink(@@lockfile)
rescue Errno::ENOENT
end
def claim_lockfile!
# Check the lockfile first
if File.directory?(File.dirname(@@lockfile))
if File.exist? @@lockfile
# check the lockfile is sane
exist_pid = File.read(@@lockfile).to_i
if exist_pid > 1 && 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
begin
File.open(@@lockfile, 'w') do |lockfile|
lockfile.puts Process.pid
end
rescue => _ex
fatal('Failed to open lockfile - are you running as root?')
end
end
def lock_out_other_processes(name)
@@lockfile = "/var/lock/byteback/#{name}.lock"
claim_lockfile!
at_exit { remove_lockfile! }
end
def log_system(*args)
debug('system: ' + args.map { |a| / / =~ 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
def btrfs_bin
%w(/bin/btrfs /sbin/btrfs).each do |path|
return path if File.exist?(path)
end
fail Errno::ENOENT, 'btrfs'
end
end
end
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