Class: LnBackup::LnBackup

Inherits:
Object
  • Object
show all
Defined in:
lib/lnbackup/backup.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(args = { :log_level => Logger::INFO, :test_mode => false, :config_dir => CONFIG_D, :log_file => LOG_FILE, :status_file_pref => STATUS_FILE_PREF, :source_prefix => '', :target_dir_name => nil, :delay => nil, :delay_denom => nil, :no_delete => false, :no_acl => false, :max_iter => 5, }) ⇒ LnBackup

Returns a new instance of LnBackup.



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# File 'lib/lnbackup/backup.rb', line 67

def initialize( args={  :log_level        => Logger::INFO, 
                        :test_mode        => false, 
                        :config_dir       => CONFIG_D,
                        :log_file         => LOG_FILE,
                        :status_file_pref => STATUS_FILE_PREF,
                        :source_prefix    => '',
                        :target_dir_name  => nil,
                        :delay            => nil,
                        :delay_denom      => nil,
                        :no_delete        => false,
                        :no_acl           => false,
                        :max_iter         => 5,
                    } )
  log_level, @test_mode, config_dir, log_file, 
      @status_file_pref, @source_prefix, @target_dir_name, @delay, @delay_denom,
          @no_delete, @no_acl, @max_iter = 
        args.values_at( :log_level, :test_mode, :config_dir, :log_file, 
          :status_file_pref, :source_prefix, :target_dir_name, :delay, :delay_denom,
            :no_delete, :no_acl, :max_iter )

  @log = nil
  begin
    @log = Logger.new( log_file == '-' ? STDOUT : log_file )
  rescue => e #Errno::EACCES, Errno::EROFS
    $stderr.puts "Exception #{e.class.to_s}: #{e.message}."
    $stderr.puts "\tUsing STDERR for logging."
    @log = Logger.new( STDERR )
    @log.debug("TEST")
  end
  @log.level = log_level
  @log.info { "Running in test mode." } if @test_mode

  @exclude_list = []
  @last_file    = nil
  @config_dir   = config_dir
  load_config
end

Instance Attribute Details

#stats ⇒ Object (readonly)

Returns the value of attribute stats.



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# File 'lib/lnbackup/backup.rb', line 42

def stats
  @stats
end

Instance Method Details

#_system_catch_stdin_stderr(*args) ⇒ Object

spusteni programu se zachycenim stdout a stderr ####



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# File 'lib/lnbackup/backup.rb', line 362

def _system_catch_stdin_stderr(*args)
  args.unshift( nil )
  system_catch_stdin_stderr_with_input( args )
end

#backup_partition?(partition) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/lnbackup/backup.rb', line 1303

def backup_partition?(partition)
  return backup_partitions.include?(partition)
end

#backup_partitions ⇒ Object 



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# File 'lib/lnbackup/backup.rb', line 1282

def backup_partitions
  devices = Dir[ @config[:device] ]
  backups = @config.keys.find_all {|k| Hash===@config[k] and @config[k].key?(:dirs) and not @config[k][:dont_check] }
  out_backup_devices = []
  devs = {}
  for backup in backups
      devs[backup] = devices
      if @config[backup][:device]
          devs[backup] = Dir[ @config[backup][:device] ]
      end
      if @config[backup][:device_label]
          devs[backup] = [ find_dev_by(devs[backup], @config[backup][:device_label], :label) ]
      end
      if @config[backup][:device_uuid]
          devs[backup] = [ find_dev_by(devs[backup], @config[backup][:device_uuid], :uuid) ]
      end
      out_backup_devices |= devs[backup]
  end
  return out_backup_devices
end

#backup_pcs(pcs_status_f, no_delete) ⇒ Object 



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# File 'lib/lnbackup/backup.rb', line 1803

def backup_pcs( pcs_status_f, no_delete )
  @log.info { "starting PCs backup" }

  if (ret = umount_fsck_mount) != 0
    return ret
  end

  pc_status = Marshal.restore( File.open( pcs_status_f ).read( nil ) ) rescue {}
  
  @pcb[:backup_hosts].each do |host|
    @log.info { "mounting #{host}" }
    mount_to = "#{@pcb[:mounts_root]}/#{host}"
    system_catch_stdin_stderr('umount', mount_to )
    FileUtils.mkpath( mount_to )

    pc_status[host] = Hash.new unless pc_status.key?(host)
    pc_status[host][:tried] = Time.now
    pc_status[host][:status] = -1
    
    cmd = [ "/bin/mount", "-t", "smbfs", "-o", 
            "username=#{@pcb[:backup_user]},"+
            "password=#{@pcb[:backup_password]},"+
            "workgroup=#{@pcb[:backup_workgroup]}", 
            "//#{host}/#{@pcb[:backup_share]}", mount_to ]
    @log.debug { "running '" + cmd.join("' '") + "'" }
    ret, out, err = system_catch_stdin_stderr( *cmd )

    if ret == 0
      begin
        @log.debug { "host #{host} mount passed" }
        
        # run backup
        bk2 = LnBackup.new( 
          :log_level         => @log.level,
          :log_file          => "#{@pcb[:log_dir]}/lnbackup-#{host}.log",
          :test_mode         => @test_mode,
          :config_dir        => @config_dir,
          :status_file_pref  => "#{@pcb[:status_dir]}/lnbackup-#{host}.status",
          :source_prefix     => mount_to,
          :target_dir_name   => "#{@pcb[:backup_config]}/#{host}",
          :no_delete         => no_delete
          )

        bk2.config_init( @pcb[:backup_config] ) # TODO: error handling ?!
        res = bk2.run_backup

        pc_status[host][:status] = res
        pc_status[host][:stats]  = bk2.stats
        if res == BACKUP_OK
          pc_status[host][:success] = Time.now
        end
      rescue => e
        @log.fatal { "host #{host} raised exception #{e.class}:'#{e.message}'" }
        @log.fatal { e.backtrace.join("\n") }
        @log.fatal { "skipping to next host" }
      ensure
        system_catch_stdin_stderr("/bin/umount", mount_to )
      end
      @log.debug { "host #{host} finished" }
    else
      @log.error { "#{host} failed: \n\tout:#{out}\n\terr:#{err}" }
      pc_status[host][:status] = SMBMOUNT_FAILED
    end
  end

  begin
    File.open( pcs_status_f, 'w' ) do |f|
      f.print Marshal.dump( pc_status )
    end
  rescue => e
    @log.error { "cannot write pc_status: #{pcs_status_f}: #{e.message}" }
  end

  umount_backup(true)
  @log.info { "finished PCs backup" }
end

#backup_pcs_status(pcs_status_f) ⇒ Object 



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# File 'lib/lnbackup/backup.rb', line 1880

def backup_pcs_status( pcs_status_f )
  pc_status = Hash.new
  begin
    pc_status = Marshal.restore( File.open( pcs_status_f ).read( nil ) )
  rescue
  end

  print "Content-type: text/html\r\n\r\n"
  puts "<html><table>"

  @pcb[:backup_hosts].each do |host|
    puts "<tr><td>#{host}<td>"

    if not pc_status.key?(host)
      puts "\t\thas no backup"
    else
      st = pc_status[host]
      if st.key?(:status) and (st[:status] == BACKUP_OK)
        puts "\t\t(OK) " + st[:success].to_s + ' ' + size2str( st[:stats][:size].to_i ) << 'B '
      else
        if st.key?(:success)
          puts "\t\t(WARN) Last success: " + st[:success].to_s
        else
          puts "\t\t(ERROR) Last tried: " + st[:tried].to_s
        end
      end
    end
  end
  
  puts "</table></html>"
end

#backup_pcs_test ⇒ Object 



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# File 'lib/lnbackup/backup.rb', line 1912

def backup_pcs_test
  @log.info { "starting PCs backup test" }

  @pcb[:backup_hosts].each do |host|
    @log.debug { "trying #{host} ... " }
    #echo smbclient -c "''" -W $BACKUP_WORKGROUP //$HOST/$BACKUP_SHARE -U $BACKUP_USER%$BACKUP_PASSWORD
    cmd = [ '/usr/bin/smbclient', '-c', '', '-W', @pcb[:backup_workgroup],
        "//#{host}/#{@pcb[:backup_share]}", '-U', 
        "#{@pcb[:backup_user]}%#{@pcb[:backup_password]}" ]
    @log.debug { "running '" + cmd.join("' '") + "'" }

    ret, out, err = system_catch_stdin_stderr( *cmd )
    if ret == 0
      @log.info { "#{host} passed" }
    else
      @log.error { "#{host} failed: ret:#{ret}\n\tout:#{out}\n\terr:#{err}" }
    end
  end

  @log.info { "finished PCs backup test" }
end

#backup_status(backup_name, status_file_pref = nil) ⇒ Object

vypsani stavu zalohy ####



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# File 'lib/lnbackup/backup.rb', line 1667

def backup_status( backup_name, status_file_pref = nil )
  @status_file_pref = status_file_pref if status_file_pref
  res = nil
  return res if (res = config_init(backup_name)) != 0

  if File.readable?(@status_file)
    puts File.open(@status_file).read(nil)
    puts
  end
  mount_backup
  backups = find_backups( backup_name )
  backups.each do |backup|
    puts backup
  end
  umount_backup(true)
end

#check_fsck ⇒ Object

kontrola disku a spousteni fsck ####



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# File 'lib/lnbackup/backup.rb', line 1598

def check_fsck
  part        = nil
  crypto      = @config[:crypto]
  password    = @config[:password]
  loop_dev    = nil

  begin
    part = conf_val(:device)
    if (crypto)
      loop_dev = find_loop
      system_catch_stdin_stderr_with_input( password+"\n", '/sbin/losetup', 
                                            '-p', '0', '-e', crypto, loop_dev, part )
      part = loop_dev
    end

    if ! part.to_s.empty?
      @log.debug { "running: /sbin/tune2fs -l #{part}" }
      fs_params = {}
      
      ret, out, err = system_catch_stdin_stderr('/sbin/tune2fs', '-l', part)
      if ret == 0
        out.split("\n").each do |l|
          k,v = l.split(/\s*:\s*/)
          fs_params[k] = v
        end
      else
        @log.error { "tune2fs failed with exit code: '#{ret}'" }
        @log.error { "\tstdout: #{out}" }
        @log.error { "\tstderr: #{err}" }
        return false
      end

      if (mount_count = fs_params['Mount count'].to_i)+5 >= 
            (max_mount_count = fs_params['Maximum mount count'].to_i)
        @log.info { "Disk #{part} has reached mount_count: #{mount_count} (max: #{max_mount_count}), running fsck" }
        if not @test_mode
          ret, out, err = system_catch_stdin_stderr( '/sbin/fsck.ext3', '-y', part )
          if ret == 0
            @log.info { "fsck found no errors" }
            return reset_mount_count( part )
          elsif ret == 1
            @log.info { "fsck corrected some errors" }
            @log.debug { "\tstdout: #{out}" }
            @log.debug { "\tstderr: #{err}" }
            return reset_mount_count( part )
          else
            @log.error { "fsck failed with exit code: '#{ret}'" }
            @log.error { "\tstdout: #{out}" }
            @log.error { "\tstderr: #{err}" }
            return false
          end
        end
      else
        @log.debug { "Disk #{part}: mount_count: #{mount_count} (max: #{max_mount_count}), not running fsck" }
      end
      @part_uuid  = fs_params['Filesystem UUID']
      @part_label = fs_params['Filesystem volume name']
      @log.info { "Disk: #{part}, UUID: #{@part_uuid}, Label: #{@part_label}" }
    end
  ensure
    if crypto and loop_dev
      system_catch_stdin_stderr( '/sbin/losetup', '-d', loop_dev )
    end
  end

  return true
end

#check_mounted ⇒ Object

mount/umount #### :none - not mounted, :ro - mounted ro, :rw - mounted rw



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# File 'lib/lnbackup/backup.rb', line 1686

def check_mounted
  File.open('/proc/mounts').read(nil).each_line do |line|
    what, where, type, opts, dump, pass = line.split(/\s+/)
    return [ opts.split(',').index('rw') ? :rw : :ro, what ] if where == conf_val(:mount_point)
  end
  return [ :none, nil ]
end

#conf_val(key) ⇒ Object 



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# File 'lib/lnbackup/backup.rb', line 44

def conf_val(key)
  raise "no @cur_config!" unless @cur_config
  @cur_config[key] || @config[key]
end

#config_init(name) ⇒ Object 



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# File 'lib/lnbackup/backup.rb', line 105

def config_init( name )
  @backup_name = name
  name = name.intern if name.class==String

  @status_file = @status_file_pref + '-' + @backup_name

  # otestujeme, jestli je definovana vybrana zaloha zadaneho jmena
  if not @config.key?(name)
    @log.fatal { "No config for backup '#{@backup_name}', exiting!" }
    return INVALID_BACKUP 
  end
  @log.debug{ $HAVE_ACL ? "ACL support" : "no ACL support" }

  # @cur_config bude obsahovat konfiguraci vybrane zalohy
  @cur_config = @config[name]
  @cur_config[:mount_point].gsub!(%r{(.)/$},'\1') if @cur_config.key?(:mount_point)
  
  # find partition by label if necessary
  if conf_val(:device_label) or conf_val(:device_uuid)
    label  = conf_val(:device_label) ? conf_val(:device_label) : conf_val(:device_uuid)
    device = find_dev_by( conf_val(:device), label,
                          conf_val(:device_label) ? :label : :uuid )
    disk = disk_for_device( device )
    @log.debug { "label/uuid: #{label.inspect}, device: #{device}, disk: #{disk}" }
    @log.error { "no device with given label/uuid #{label.inspect}" } unless device

    return DEVICE_NOT_FOUND if device.nil? or disk.nil?
    @cur_config[:device], @cur_config[:disk] = [device, disk]
  end
  return 0
end

#copy_preserve(from, to) ⇒ Object 



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# File 'lib/lnbackup/backup.rb', line 609

def copy_preserve( from, to )
  begin
    if not File.syscopy2( from, to )            # Errno::ENOSPC se siri ven
      File.unlink( to )
      raise SysCopyFailure.new( "syscopy2 returned false when copying #{from} --> #{to}" )
    end
  rescue Errno::EIO => e      # tak tohle znamena poradnej pruser....
    msg = "i/o error copying #{from} : #{e.message}"
    @log.error {  msg  }
    raise SysCopyFailure( msg )
  rescue Errno::ETXTBSY => e  # (windows) maji zamklej soubor?
    msg = "text file busy #{from} : #{e.message}"
    @log.error { msg }
    raise SysCopyFailure.new( msg )
  end     

  st = nil
  begin
    st = File.stat( from )
  rescue => error
    @log.warn { "copy_preserve: File.stat #{from} got error and failed: #{error.message}\n" }
    @log.warn { "copy_preserve: NOT restoring owner, rights, times and ACLs on #{to}\n" }
  end
  
  if st
    begin 
      File.chown( st.uid,   st.gid,   to )
    rescue => error
      @log.warn { "copy_preserve: chown #{to} got error and didn't restore owner: #{error.message}\n" }
    end
    begin 
      File.chmod( st.mode,  to )
    rescue => error
      @log.warn { "copy_preserve: chmod #{to} got error and didn't restore rights: #{error.message}\n" }
    end
    if $HAVE_ACL and not @no_acl
      begin
        acl = get_access_acl( from )
        acl.set_file( to ) if acl
      rescue => error
        @log.warn { "copy_preserve: setfacl #{to} got error and didn't restore ACLs: #{error.message}\n" }
      end
    end
    begin 
      File.utime( st.atime, st.mtime, to )
    rescue => error
      @log.warn { "copy_preserve: utime #{to} got error and didn't restore times: #{error.message}\n" }
    end
  end
end

#create_fstab(mnt, part, disk) ⇒ Object

generovani souboru TODO: pokud je zaloha udelana pres label, generovat fstab na label

i swap lze nalezt pres label v /dev/disk/by-uuid/

priklad /etc/fstab

UUID=ad71a12d-9cdf-460e-beab-969533237a36 none swap defaults 0 0
UUID=b76083c3-2871-4719-a670-26848043686d /    ext3 defaults 0 0



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# File 'lib/lnbackup/backup.rb', line 1538

def create_fstab( mnt, part, disk )
  swap_line = `/sbin/fdisk -l #{disk} | grep 'Linux swap'`.chomp
  swap_n    = ( ( swap_line =~ /^#{disk}(\d+).*$/ ) ? $1 : nil ).to_s
  part_n    = ( ( part =~ /^#{disk}(\d+)$/ ) ? $1 : nil ).to_s
  fstab     = "#{mnt}/etc/fstab"

  # check fstab
  if part_n == ''
    @log.error { "Cannot find correct part_n='#{part_n}'!" }
    @log.error { "The file '#{fstab}' was not generated." }
    @log.error { "Backup not bootable!" }
    return false
  end
  if swap_n == ''
    @log.warn { "Cannot find correct swap_n='#{swap_n}" }
    @log.warn { "The file '#{fstab}' was generated WITHOUT SWAP partition." }
    @log.warn { "Backuped system may have problems !" }
  end

  ext3_options = 'noatime,defaults,errors=remount-ro'
  ext3_options << ',acl,user_xattr' if $HAVE_ACL and not @no_acl
  
  # create fstab
  File.unlink(fstab)
  File.open(fstab,'w') do |f|             # TODO: generate fstab based of filesystem LABELs (if possible, swap?)
                                          #       otherwise we don't boot system from SATA/SCSI disks
    f.puts '#<file system> <mount point>   <type>  <options>           <dump>  <pass>'
    f.puts "/dev/hda#{part_n} /            ext3     #{ext3_options}    0       1"
    f.puts "/dev/hda#{swap_n} none         swap     sw                 0       0" if swap_n != ''
    f.puts "proc              /proc        proc     defaults           0       0"
  end

  return true
end

#create_lilo_conf(mnt, part, disk) ⇒ Object 



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# File 'lib/lnbackup/backup.rb', line 1573

def create_lilo_conf( mnt, part, disk )
  # run lilo
  sys_lilo_cfg = "/etc/lilo.conf"             # TODO relativni k necemu?
  lilo_cfg     = File.join( mnt, sys_lilo_cfg )


  File.unlink( lilo_cfg  )
  File.open( lilo_cfg, 'w' ) do |f|
    f.puts "disk=#{disk}\nbios=0x80"
    content = File.open( sys_lilo_cfg ).read(nil)
    f.print content.gsub(/^((raid-extra-boot|disk|bios)[[:space:]]*=)/, '#\1')
  end

  lilo_ret, lilo_out, lilo_err = system_catch_stdin_stderr( LILO_PATH, '-r', mnt, '-b', disk )
  if lilo_ret != 0 # check lilo
    @log.error { "error (#{lilo_ret}) in: '/sbin/lilo -r #{mnt} -b #{disk}' --> system not bootable" }
    @log.error { "\tstdout: #{lilo_out}" }
    @log.error { "\tstderr: #{lilo_err}" }
    return false
  else
    return true
  end
end

#create_mirror ⇒ Object

vytvoreni mirroru pousti se po run_backup, takze muze pocitat s pripravenym prostredim…



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# File 'lib/lnbackup/backup.rb', line 1407

def create_mirror
  # pokud nema vybrana konfigurace v konfiguraci povoleno mirrorovani,
  # vratime nil
  return nil unless @cur_config[:mirror] == true

  # pokud nemame device, nebo mount_point, nebo jsou prazdne, tak to rozhodne zabalime
  return nil if conf_val(:device).to_s.empty? or conf_val(:mount_point).to_s.empty?

  # taky to zabalime, jestlize mame zadano crypto (neumime bootovat z sifrovane zalohy)
  return nil if @config.key?(:crypto)

  mnt  = conf_val(:mount_point)
  part = conf_val(:device)
  disk = conf_val(:disk)

  lock_file_name = File.join(mnt,'LNBACKUP_RUNNING')
  return LNBACKUP_RUNNING if detect_running(lock_file_name)
  lock_file = File.open( lock_file_name, 'w' )
  lock_file.puts($$)
  lock_file.flush

  @log.info { "creating bootable mirror #{@backup_name} at #{part} mounted as #{mnt}" }

  # smazat stary mirror
  command = [ 'find', "#{mnt}", '-xdev',
                  '-maxdepth', '1', '-mindepth', '1', 
                  '!', '-name', 'backup',
                  '!', '-name', 'LNBACKUP_RUNNING',
                  '!', '-name', 'lost+found', 
                  '-exec', 'rm', '-fr', '{}', ';' ]
  @log.debug { 'running: ' + command.join(' ')  }
  system( *command ) unless @test_mode

  @exclude_list = []
  @skip_excludes = true
                  
  @dont_delete      = [@dest]
  latest_mirror     = @dest
  latest_mirror_len = latest_mirror.size
  target_dir        = conf_val(:mount_point)

  # vytvorit novy mirror
  dirs_to_restore   = []
  last_depth        = 0
  Find.find3(latest_mirror + '/') do |src,depth| 
    if @delay_denom
      if @delay and (rand(@delay_denom) == 0)
          sleep(@delay)
      end
    elsif @delay
      sleep(@delay)
    end
    dirs_to_restore = restore_dir_attributes(dirs_to_restore, depth+1) if last_depth>depth
    last_depth      = depth

    src     = File.expand_path('./' + src, '/')
    tmp_dst = './' + src[latest_mirror_len..-1]
    dest    = File.expand_path(tmp_dst, target_dir)

    next if src==latest_mirror

    begin
      if File.symlink?(src) or File.blockdev?(src) or File.chardev?(src) or File.socket?(src) or File.pipe?(src)
        # symlink, blockdev, chardev, socket, pipe zalohujeme pomoci 'cp -a'
        do_cp_a(src, dest)
      elsif File.directory?(src)
        # adresar
        # preskocime koren, protoze uz je vytvoren
        next if src == latest_mirror
        do_cp_dir(src, dest)
        # ulozime si ho do seznamu pro pozdejsi nastaveni vlastnosti
        dirs_to_restore << [ dest, File.stat(src), get_access_acl(src), get_default_acl(src), depth ] ### TODO: CHYBA?
      else # normalni soubor --> hard link
        do_hardlink(src, src, dest)
      end
    end
  end
  restore_dir_attributes(dirs_to_restore)

  # vypnout lnbackup na zazalohovane kopii
  # mv "$MNT"/etc/cron.daily/lnbackup{,.disabled}                                                                                                                               
  # ucinit system bootovatelnym, pokud mame zadan i disk
  ret = true
  if disk
    if not @test_mode
      ret = create_fstab( mnt, part, disk )

      if ret and not @cur_config[:skip_lilo]
        if FileTest.executable?(LILO_PATH)
          ret = create_lilo_conf( mnt, part, disk )
        else
          @log.warn { "LILO binary '#{LILO_PATH}' not found, skipping LILO" }
        end
      else
        @log.info { "skipping LILO as requested in config" }
      end
    end
  else
    @log.error { "'disk' not defined, skipping LILO and fstab ..." }
    ret = false
  end

  status = [""]
  if ret
    @log.info { "Mirror '#{@backup_name}' finished." }
    status << "mirror end:    #{Time.now}"
  else
    @log.error { "Mirror '#{@backup_name}' failed." }
    status << "mirror failed: #{Time.now}"
  end

  print_status_array(status,'a')
  return BACKUP_OK
ensure
  if lock_file
    begin
      lock_file.close
    ensure
      File.delete( lock_file_name )
    end
  end
end

#crypto_init(size) ⇒ Object 



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# File 'lib/lnbackup/backup.rb', line 1934

def crypto_init(size)
  device   = conf_val(:device)
  crypto   = @config[:crypto]
  password = @config[:password]

  if crypto and password and device
    mk_loop( device, password, size, crypto )
  else
    @log.fatal { "crypto_init: must specify device, crypto and password in config file" }
  end
end

#detect_running(lock_file_name) ⇒ Object 



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# File 'lib/lnbackup/backup.rb', line 770

def detect_running(lock_file_name)
  if FileTest.exists?(lock_file_name)
    @log.debug { "detect_running: lock file #{lock_file_name} exists" }
    pid = File.open(lock_file_name).read(nil).chomp.to_i rescue nil
    if pid == nil
      @log.error { "detect_running: invalid PID in #{lock_file_name}" }
      @log.warn { "detect_running: assuming lnbackup not running" }
      return false
    end
    if FileTest.exists?(cmd_file="/proc/#{pid}/cmdline")
      cmd_line = File.open(cmd_file).read(nil) rescue ''
      @log.debug { "detect_running: process ##{pid}' command line: #{cmd_line}" }
      if (cmd_line =~ /\/lnbackup/)
        @log.error { "lnbackup already running, pid: #{pid}, command line: #{cmd_line}" }
        return true
      else
        @log.warn { "lnbackup probably not running lock_file_name: #{lock_file_name}" }
        @log.warn { "\t\tpid: #{pid}, command line: #{cmd_line}" }
        return false
      end
    else
      @log.debug { "detect_running: #{lock_file_name} does not exist" }
      return false
    end
  else
    return false
  end
end

#disk_for_device(device) ⇒ Object 



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# File 'lib/lnbackup/backup.rb', line 495

def disk_for_device( device )
  # TODO: udelat poradne
  if device =~ %r{^(/dev/[hs]d[a-z])[0-9]$}
    return $1
  elsif device =~ %r{^(/dev/.*?)p[0-9]$}
    return $1
  end
  return nil
end

#do_copy(src, dest) ⇒ Object 



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# File 'lib/lnbackup/backup.rb', line 216

def do_copy(src,dest)
  find_exclude?(src)

  @log.debug { "do_copy( #{src}, #{dest})" }

  begin
    # nejdrive udelame misto
    make_space_for(src)
    # pak kopirujeme
    copy_preserve( src, dest ) if !@test_mode

  rescue Errno::ENOSPC    # behem kopirovani nastala vyjimka -- doslo misto
    @log.info { "copy_preserve: Errno::ENOSPC (#{src}), making space..." }
    make_some_space and   # nejdriv udelame nejake misto, protoze make_space_for
                          # nemusi nic smazat, napriklad pokud je mezitim zdroj
                          # soubor smazan
    make_space_for(src) and retry
                          # pak udelame misto pro dany soubor (muze byl
                          # veliky) a zkusime to znovu
  rescue SysCopyFailure => err
    # syscopy selhal
    @log.info { "copy_preserve: SysCopyFailure (#{src}), checking space..." }
    # muze se stat, ze selze, protoze nema misto, nebo z neznameho duvodu (treba Errno::EIO)
    begin
      if @space_calc.can_backup?(src)
        # mistem to nebylo --> chyba
        @log.error { "copy_preserve: SysCopyFailure (#{src}), enough space --> skipping file" }
        return false
      else
        # TODO: sem by se vubec nemelo dojit (na dojiti mista je samostatna vyjimka ENOSPC)
        # asi nam nekdo pod rukama zabral misto, zkusime znovu
        @log.info { "copy_preserve: Making space (#{src})..." }
        make_space_for(src) and retry
      end
    rescue => e
      @log.error { "do_copy: exception #{e.class}: #{e.message} when handling exception" }
      @log.error { "skipping file #{src}" }
      return false
    end
  rescue Errno::EOVERFLOW
    # soubor je moc velky, neni zazalohovan
    @log.error { "copy_preserve: Errno::EOVERFLOW (#{src}), file too large --> skipping file" }
    return false
  rescue Errno::ENOENT
    # soubor nam zmizel pod rukama behem zalohovani
    @log.warn { "copy_preserve: Errno::ENOENT (#{src}), file deleted during backup" }
    return false
  end
  return true
end

#do_cp_a(src, dest) ⇒ Object

kopirovaci rutiny ####



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# File 'lib/lnbackup/backup.rb', line 164

def do_cp_a( src, dest )
  find_exclude?(src)

  @log.debug { "cp -a #{src} #{dest}" }

  if !@test_mode
    ret, out, err = system_catch_stdin_stderr('/bin/cp', '-a', src, dest)
    if ret != 0 
      @log.info { "/bin/cp failed: '#{err}' (#{src}), making space..." }

      make_some_space if @space_calc.much_used?

      ret, out, err = system_catch_stdin_stderr('/bin/cp', '-a', src, dest)
      if ret != 0
        @log.error { "do_cp_a: file copy failed ( '/bin/cp', '-a', #{src}, #{dest} ), out: #{out}, error: #{err}" }
        @log.error { "\t #{src} not copied" }
      end
    end
  end
end

#do_cp_dir(src, dest) ⇒ Object 



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# File 'lib/lnbackup/backup.rb', line 185

def do_cp_dir(src, dest)
  find_exclude?(src + '/')

  @log.debug { "FileUtils.mkpath #{dest}" }

  if !@test_mode
    begin
      FileUtils.mkpath(dest)
    rescue Errno::ENOSPC
      @log.info { "FileUtils.mkpath: Errno::ENOSPC (#{src}), making space..." }
      make_some_space and retry
    end
  end
end

#do_hardlink(last, src, dest) ⇒ Object 



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# File 'lib/lnbackup/backup.rb', line 200

def do_hardlink(last, src, dest)
  find_exclude?(src)

  @log.debug { "File.link #{last}, #{dest}" }
  if !@test_mode
    begin
      File.link(last, dest)
    rescue Errno::ENOSPC
      @log.info { "File.link: Errno::ENOSPC (#{src}), making space..." }
      make_some_space and retry
    rescue => err
      @log.error { "File.link (#{last} -> #{dest}) error: #{err.message} --> skipping from backup" }        # TODO: nastavit indikator chyby!
    end
  end
end

#do_mirror_only(name) ⇒ Object 



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# File 'lib/lnbackup/backup.rb', line 1395

def do_mirror_only(name)
  if (res = config_init(name)) != 0
    return res 
  end
  
  @status_file = '/dev/null'
  @dest        = find_backups[-1]
  create_mirror
end

#find_backups(name = nil, any = false) ⇒ Object

hledani starych backupu ####



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# File 'lib/lnbackup/backup.rb', line 138

def find_backups( name=nil, any=false )               # TODO --- pripravit na moznost hodinovych zaloh
  dest   = nil
  hourly = nil
  # budto mame zadano jmeno zalohy, na kterou se ptame, nebo se pouzije ta,
  # s kterou bylo spusteno run_backup
  if name
    name_s = name.class == String ? name.intern : name
    if !@config.key?(name_s)
      @log.fatal { "No config for backup '#{name_s.to_s}'" }
      return []
    end
    dest   = @config[name_s].key?(:target_dir) ? @config[name_s][:target_dir] : conf_val(:mount_point)
    hourly = @config[name_s][:hourly]
  else
    name   = @target_dir_name
    dest   = @cur_config.key?(:target_dir) ? @cur_config[:target_dir] : conf_val(:mount_point)
    hourly = @cur_config[:hourly]
  end
  if any
    return Dir["#{dest}/backup/*/*/*"].sort
  else
    return Dir["#{dest}/backup/*/*/*/#{name}"].sort
  end
end

#find_dev_by(device_mask, label, by = :label) ⇒ Object

nastavovani labelu: tune2fs -L MUFF2 /dev/sdb1



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# File 'lib/lnbackup/backup.rb', line 506

def find_dev_by( device_mask, label, by=:label )
  found  = false
  device = nil
  if Array === device_mask
      devices = device_mask
  else
      devices = Dir[ device_mask ]
  end

  File.readlines('/proc/partitions')[2..-1].each do |line|
    major, minor, blocks, name = line.sub(/^\s+/,'').split(/\s+/)

    dev = File.join('/dev', name)
    # test na masku
    next unless devices.index( dev )
    
    if FileTest.blockdev?( dev )
      @log.debug( "find_dev_by: checking #{dev}" )
      dump = tune2fs( dev )
      if (
           ((by == :label) && (String === label) && ( dump['Filesystem volume name'] =~ /^#{label}$/ )) ||
           ((by == :label) && (Array  === label) && ( label.index(dump['Filesystem volume name'] ))) ||
           ((by == :uuid)  && (String === label) && ( dump['Filesystem UUID'] == label )) ||
           ((by == :uuid)  && (Array  === label) && ( label.index(dump['Filesystem UUID'] )))
         )
        if found
          @log.error{ "found at least two devices with given label #{label.inspect}: #{dev} and #{device}" }
          return nil
        else
          found  = true
          device = dev
        end
      end
    end
  end
  return device
end

#find_exclude?(path) ⇒ Boolean

hledame 1. match a podle neho se ridime, cili pod klicem :exclude ZALEZI NA PORADI a na predni mista davame konkretnejsi pravidla a az na ne pravidla obecnejsi

Returns:

  • (Boolean) 


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# File 'lib/lnbackup/backup.rb', line 690

def find_exclude?( path )
  return if @skip_excludes
  # spocteme si relativni cestu
  rel_path = path.dup
  if rel_path.index( @exclude_root ) == 0
    if @exclude_root == '/'
      rel_path[0,1] = ''
    else
      rel_path[0,@exclude_root.length+1] = '' # odmazeme vcetne lomitka
    end
  else
    rel_path = nil # muzeme nastavit nil, protoze nil =~ /cokoliv/ je false
  end
  # matchujeme
  @exclude_list.each do |a|
    begin
      if (a[2] ? path : rel_path) =~ a[1] 
        if a[0]
          @log.debug { "excluding(#{a[1].source}): #{path}" }
          Find.prune
        else
          return
        end
      end
    rescue => e
      @log.warn { "problem with encoding --> not pruning" }
      @log.warn { "pattern: #{a.inspect}, path: #{path.inspect}, rel_path: #{rel_path.inspect}, exception #{e.class}:'#{e.message}'" }
      @log.warn { e.backtrace.join("\n") }
      return
    end
  end
end

#find_loop(max = 8) ⇒ Object

pomocne rutiny pro praci s crypto loop ####



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# File 'lib/lnbackup/backup.rb', line 545

def find_loop(max=8)
  ret, out, err = system_catch_stdin_stderr('/sbin/losetup', '-a')
  return nil if ret != 0

  loops = out.collect do |l| 
    (dev,x) = l.split(':',2)
    dev.sub(%r|^/dev/loop|,'').to_i 
  end

  for i in 0..max
    if not loops.index(i)
      return "/dev/loop#{i}"
    end
  end
  return nil
end

#find_same_prev_backup(src, tmp_src, all_backups) ⇒ Object

Hledame v predchozich zalohach soubor jmena podle tmp_src. Divame, jestli nalezeny souboj je “stejny” jako ten, ktery mame zalohovat. Pokud ano, vratime ho, jinak vratime nil. Hledani zarazime, pokud najdeme soubor na stejne ceste, ktery neni “stejny”

TODO: hledani by se melo take zastavit, kdyz se podivame do posledni dokoncene zalohy – na to potrebujeme strojive zpracovatelny status file pro predchozi zalohy –> ukol k reseni



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# File 'lib/lnbackup/backup.rb', line 809

def find_same_prev_backup( src, tmp_src, all_backups )
  max_iter = @max_iter
  all_backups.reverse.each do |prev_backup|
    last = File.expand_path(tmp_src, prev_backup)
    return last  if same_file?(src,last)
    return false if FileTest.exists?(last)

    max_iter -= 1
    return false if max_iter == 0
  end
  return nil
end

#get_access_acl(file) ⇒ Object 



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# File 'lib/lnbackup/backup.rb', line 822

def get_access_acl(file)  ($HAVE_ACL and not @no_acl) ? (ACL::from_file(file) rescue nil) : nil; end

#get_default_acl(file) ⇒ Object 



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# File 'lib/lnbackup/backup.rb', line 823

def get_default_acl(file) ($HAVE_ACL and not @no_acl) ? (ACL::default(file)   rescue nil) : nil; end

#go_backup(name, no_mirror) ⇒ Object

zalohovani se vsim vsudy ####



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# File 'lib/lnbackup/backup.rb', line 750

def go_backup( name, no_mirror )
  if ((res = config_init(name)) != 0) || ((res = umount_fsck_mount) != 0) 
    return res
  end

  res = run_backup
  if (res == BACKUP_OK)
    # pokud probehla v poradku 1. faze muzeme pokracovat mirrorem
    if not no_mirror
      mirror_res = create_mirror
      res = mirror_res unless mirror_res == nil
    end
  else
    print_error_stats( res )
  end
  
  umount_backup(true)
  return res
end

#load_config ⇒ Object

inicializace a konfigurace ####



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# File 'lib/lnbackup/backup.rb', line 50

def load_config
  @config = {}
  p "config dir: #{@config_dir}"
  @log.debug { "config dir: #{@config_dir}" }
  Dir[(@config_dir+File::SEPARATOR).squeeze('/')+'*'].sort { |a,b| 
    a.split(File::SEPARATOR)[-1][1..2].to_i <=> b.split(File::SEPARATOR)[-1][1..2].to_i 
  }.each do |conf|
    next if conf =~ /\/[^\/]*\.[^\/]*$/
    if FileTest.file?(conf)
      @log.debug { "\tadding config file: #{conf}" }
      @config.append( eval( File.open(conf).read ) )
    end
  end
  @pcb = @config[:pcb]
  @config[:mount_point].gsub!(%r{(.)/$},'\1')
end

#make_some_space ⇒ Object 



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# File 'lib/lnbackup/backup.rb', line 300

def make_some_space
  remove_oldest
  while @space_calc.much_used?
    remove_oldest
  end
end

#make_space_for(path) ⇒ Object

uvolnovani mista ####



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# File 'lib/lnbackup/backup.rb', line 293

def make_space_for( path )
  while not @space_calc.can_backup?(path) do 
    @log.debug { "make_space_for: Not enough space for #{path}, removing oldest." }
    remove_oldest
  end
end

#mirror_only(backup_name) ⇒ Object 



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# File 'lib/lnbackup/backup.rb', line 1793

def mirror_only( backup_name )
  return MOUNT_FAILED unless mount_backup

  mirror_res = do_mirror_only( backup_name )
  res        = mirror_res unless mirror_res == nil

  umount_backup
  return 0
end

#mk_loop(dev, passwd, size = 0, crypto = 'aes-256') ⇒ Object 



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# File 'lib/lnbackup/backup.rb', line 562

def mk_loop( dev, passwd, size=0, crypto='aes-256' )
  if dev !~ %r|/dev/|
    system_catch_stdin_stderr( '/bin/dd', 'if=/dev/zero', "of=#{dev}", 'bs=1M', "count=#{size}" )
  end

  loop_dev = find_loop
  system_catch_stdin_stderr_with_input( passwd+"\n", '/sbin/losetup', '-p', '0', '-e', crypto, loop_dev, dev )
  system_catch_stdin_stderr( 'mkfs.ext3', loop_dev )
  system_catch_stdin_stderr( '/sbin/losetup', '-d', loop_dev )
end

#mount_backup(rw = true) ⇒ Object 



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# File 'lib/lnbackup/backup.rb', line 1694

def mount_backup(rw = true)
  device      = conf_val(:device)
  mount_point = conf_val(:mount_point)
  fstype      = conf_val(:fs_type)
  crypto      = @config[:crypto]
  password    = @config[:password]
  remount     = false

  if ! device.to_s.empty? and ! mount_point.to_s.empty?

    mount_status, mount_dev = check_mounted
    @log.debug { "mount status before mount: device: #{mount_dev}, status: #{mount_status}" }

    # pokud je na nasem mountpointu namountovano cokoliv jineho, nez co ma byt, koncime 
    if (mount_status != :none) and (mount_dev != device)
      @log.fatal { "wrong device mounted as #{mount_point}: have #{mount_dev}, need #{device}"}
      return false
    end

    if mount_status != :none
      if (mount_status == :ro) and rw
        # mame namontovano, ale jen ro, musime remountovat
        remount = true
      else 
        # mame namontovano rw, ale neudelali jsme si to sami, preskocime mounting
        @log.warn { "disk not remounted, using previously mounted disk!" }
        return true
      end
    end
    
    # try mount
    @log.debug { "mounting #{device} --> #{mount_point} " + 
                    (rw ? (remount ? 'remount,RW' : 'RW') : 'RO') + 
                    (crypto ? '[crypto]':'') }

    cmd = [ 'mount', device, mount_point ]
    if rw
      if remount
        cmd << '-o' << 'remount,rw'
      end
      cmd << '-o' << 'noatime'
    else
      cmd << '-o' << 'ro'
    end
    cmd << '-o' << 'acl,user_xattr' if $HAVE_ACL and not @no_acl

    cmd << '-t' << fstype unless fstype.to_s.empty?

    ret, out, err = 
        crypto ? system_catch_stdin_stderr_with_input( 
                    *( [password+"\n"] + cmd + ["-oencryption=#{crypto}", '-p', '0'] ) ) :
                 system_catch_stdin_stderr( *cmd )
    if ret != 0
      @log.fatal { "mount #{device} --> #{mount_point} failed" }
      @log.warn { "\tstdout: #{out}" }
      @log.warn { "\tstderr: #{err}" }
      return false
    end
  end
  return true
end

#nagios_check(backup_name = 'localhost') ⇒ Object 



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# File 'lib/lnbackup/backup.rb', line 1322

def nagios_check( backup_name = 'localhost' )
  @status_file = @status_file_pref + '-' + backup_name
  conf_key = backup_name.intern

  if not @config.key?(conf_key)
      return [ 2, "backup '#{backup_name}' not configured" ]
  end

  no_mirror_warn = false
  warn_t  = 26  # implicitni hodnoty pro warning a error (v hodinach)
  error_t = 30
  if @config[conf_key].key?(:monitor)
    warn_t         = @config[conf_key][:monitor][:warn]           || warn_t
    error_t        = @config[conf_key][:monitor][:error]          || error_t
    no_mirror_warn = @config[conf_key][:monitor][:no_mirror_warn] || false
  end

  stats   = {}
  message = ''
  status  = 0

  if File.readable?(@status_file)
    stats = parse_stats
  else
    return [ 2, "backup status file #{@status_file} not found" ]
  end

  if stats.key?('backup end')
    message  = stats['lnbackup statistics for'] + ': '

    delta = ((Time.now() - Time.parse( stats['backup end'] ))/3600).to_i
    if delta > error_t
      status = 2
      message << "backup age: #{delta}h > #{error_t} ->ERR"
    elsif delta > warn_t
      status = 1
      message << "backup age: #{delta}h > #{warn_t} ->WARN"
    else
      if stats.key?('mirror end')
        message << (Time.parse( stats['mirror end'] ).strftime( '%H:%M:%S %d/%m/%y' ) rescue 'parse error')
        message << ' : ' << size2str(stats['backup size'].to_i) << '/' << size2str(stats['total size']) << 'B '
        message << '(bootable)'
      else
        message << stats['backup end']
        message << ' : ' << size2str(stats['backup size'].to_i) << '/' << size2str(stats['total size']) << 'B '
        if @config[backup_name.intern][:mirror]
          if no_mirror_warn
            message << '(not bootable ->warning canceled by config)'
          else
            message << '(not bootable ->WARN)'
            status = 1 if status < 1
          end
        end
      end
    end

  else
    message  = backup_name.to_s + ' : '
    if stats.key?("error code")
      status  = (s = stats['error code'].to_i) > status ? s : status
      message << stats['message']
    else
      message << "Unknown error"
      stats = 2
    end
  end

  return [ status<2 ? status : 2, message ]
rescue
  raise
  return [ 2, "can't parse status file #{@status_file}" ]
end

#nagios_check_all ⇒ Object 



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# File 'lib/lnbackup/backup.rb', line 1307

def nagios_check_all
  #backups = @config[:check_backups] || [:localhost]
  total_message     = ''
  total_message_bad = ''
  worst_result      = 0
  for backup in @config.keys.find_all {|k| Hash===@config[k] and @config[k].key?(:dirs) and not @config[k][:dont_check] }
    result, message = nagios_check( backup.to_s )
    total_message     << '[' << message << '] '
    total_message_bad << '[' << message << '] ' if result != 0
    worst_result      = result > worst_result ? result : worst_result
  end
  total_message = total_message_bad if worst_result != 0
  return [worst_result, total_message]
end

#parse_stats ⇒ Object 



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# File 'lib/lnbackup/backup.rb', line 1260

def parse_stats
  stats = {}
  File.open(@status_file,'r').readlines.each do |line|
    key, value = line.chomp.split(':',2).collect{ |a| a.strip }
    stats[key] = value
  end
  return stats
end

#print_error_stats(err) ⇒ Object 



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# File 'lib/lnbackup/backup.rb', line 1210

def print_error_stats(err)
  status = []
  status << "error code: #{err}" 
  status << "message: #{MESSAGES[err]}"
  print_status_array(status)
  return err
end

#print_stats(code) ⇒ Object 



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# File 'lib/lnbackup/backup.rb', line 1178

def print_stats( code )
  sum = 0
  [:file, :dir, :symlink, :blockdev, :chardev, :socket, :pipe].each { |s| sum += @stats[s] }

  status = []
  status << "lnbackup statistics for: #{@target_dir_name}"
  status << "backup config:           #{@backup_name}"
  status << "overall status code:     #{code}"
  status << "overall status message:  #{MESSAGES[code]}"
  status << "running in: TEST MODE" if @test_mode
  status << ""
  status << "backup start:  #{@backup_start}"
  status << "backup end:    #{Time.now}"
  status << "total size:    #{@stats[:total_size]}"
  status << "backup size:   #{@stats[:size]}"
  status << "backup blocks: #{@stats[:blocks]}"
  status << ""
  status << "files unmodified: #{@stats[:f_same]}"
  status << "files changed:    #{@stats[:f_changed]}"
  status << "files new:        #{@stats[:f_new]}"
  status << ""
  status << "total objects: #{sum}"
  status << "files:         #{@stats[:file]}"
  status << "dirs:          #{@stats[:dir]}"
  status << "symlinks:      #{@stats[:symlink]}"
  status << "blockdevs:     #{@stats[:blockdev]}"
  status << "chardevs:      #{@stats[:chardev]}"
  status << "sockets:       #{@stats[:socket]}"
  status << "pipes:         #{@stats[:pipe]}"
  print_status_array(status)
end

#print_status_array(status, mode = 'w') ⇒ Object

prints status information to log file, stdout and to status file



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# File 'lib/lnbackup/backup.rb', line 1219

def print_status_array( status, mode='w' )
  @log.info { "Status information follows" }
  status_hash = {}
  status.each do |line|
    puts line
    @log << line + "\n"

    key, value = line.chomp.split(':',2).collect{ |a| a.strip }
    status_hash[key] = value
  end
  status_hash['uuid']  = @part_uuid
  status_hash['label'] = @part_label
  begin
    File.open(@status_file,mode) do |f|
      status.each { |line| f.puts line }
    end
  rescue => error
    @log.error { "error writing status file #{@status}: #{error.message}" }
  end
  # binary status file
  begin
    # read the status array
    status_array = Marshal.restore( File.open(@status_file+'.bin').read(nil) ) rescue []

    # adding to last status information -- take the last status info, modify it and write back
    if mode == 'a'
      status_array[0] ||= {}
      status_array[0].update( status_hash )

    # writing new status information -- add new element to the beginning
    else 
      status_array.unshift( status_hash )
    end

    # write the status array
    File.open(@status_file+'.bin','w') { |f| f << Marshal.dump( status_array ) }
  rescue => error
    @log.error { "error writing binary status file #{@status}: #{error.message}" }
  end
end

#realpath(file) ⇒ Object

resolve symlinks in file path



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# File 'lib/lnbackup/backup.rb', line 270

def realpath(file)
  if not File.respond_to?(:readlink) then
    return file
  end

  file = File.expand_path(file)
  return file if file == '/'

  total = ''
  file.split(File::SEPARATOR).each do |comp|
    next if comp.empty?
    total << File::SEPARATOR + comp
    if File.symlink?(total) then
      begin
        total = File.expand_path( File.readlink(total), File.dirname(total) )
      end while File.symlink?(total)
    end
  end

  return total
end

#remove_oldest ⇒ Object

Raises:



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# File 'lib/lnbackup/backup.rb', line 307

def remove_oldest
  if @no_delete
    @log.fatal { "backup device is full, terminating..." }
    raise MakeSpaceFailure.new(DEVICE_FULL)
  end
  backups = find_backups(nil,true)

  oldest = nil
  # hledame nejstarsi zalohu, ktera neni na seznamu chranenych
  backups.each do |backup|
    if not @dont_delete.index(backup)
      oldest = backup
      break
    end
    @log.debug { "not deleting #{backup}" }
  end
  
  if oldest
    oldest.sub!("/#{@backup_name}$",'') 
    if FileTest.directory?(oldest)
      @log.info { "free blocks: %s files: %s" % @space_calc.get_free }
      @log.info { "removing oldest: '#{oldest}'" }

      if not @test_mode
        if Process.euid != 0
          @log.debug { "/bin/chmod -R u+rwX #{oldest}" }
          system('/bin/chmod', '-R', 'u+rwX', oldest)
        end
        @log.debug { "/bin/rm -rf #{oldest}" } or raise MakeSpaceFailure.new(FAILED_TO_FREE_SPACE)
        system('/bin/rm', '-rf', oldest) or raise MakeSpaceFailure.new(FAILED_TO_FREE_SPACE)

        # mazeme prazdne adresare
        begin
          oldest.sub!(%r'/\d\d$','')
          Dir.rmdir(oldest)               # mazeme mesic
          oldest.sub!(%r'/\d\d$','')
          Dir.rmdir(oldest)               # mazeme rok
        rescue 
          # odchytávame výjimku mazání neprázdného adresáře
        end
      end
      @log.info { "removing oldest done" }
      @log.info { "free blocks: %s files: %s" % @space_calc.get_free }
      return true
    end
    @log.fatal { "remove_oldest: FileTest.directory?(#{oldest}) failed, not removing (processing file: #{@last_file})" }
  else
    @log.fatal { "remove_oldest: No backup to be removed found (processing file: #{@last_file})." }
  end

  @log.fatal { "remove_oldest failed" }
  raise MakeSpaceFailure.new(FAILED_TO_FREE_SPACE)
end

#reset_mount_count(dev) ⇒ Object

resetovani pocitadla mountu



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# File 'lib/lnbackup/backup.rb', line 483

def reset_mount_count( dev ) # TODO error handling
  @log.info { "reseting mount count on #{dev}" }
  ret, out, err = system_catch_stdin_stderr( '/sbin/tune2fs', '-C', '0', dev )
  if ret != 0
    @log.error { "tune2fs failed with exit code: '#{ret}'" }
    @log.error { "\tstdout: #{out}" }
    @log.error { "\tstderr: #{err}" }
    return false
  end
  return true
end

#restore_dir_attributes(dirs, depth = 0) ⇒ Object

pomocne File rutiny ####



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# File 'lib/lnbackup/backup.rb', line 574

def restore_dir_attributes(dirs,depth=0)
  #@log.debug { "restore_dir_attributes: depth=#{depth}" }
  return dirs.find_all do |dir, stat, access_acl, default_acl, d|
    next true if d<depth
    
    @log.debug { "chown, utime, chmod #{dir}" } 
    if not @test_mode
      begin 
        File.chown(stat.uid, stat.gid, dir)
      rescue => error
        @log.warn { "restore_attributes: chown #{dir} got error and didn't restore owner': #{error.message}\n" }
      end
      begin 
        File.chmod(stat.mode, dir)
      rescue => error
        @log.warn { "restore_attributes: chmod #{dir} got error and didn't restore rights': #{error.message}\n" }
      end
      if $HAVE_ACL and not @no_acl
        begin
          access_acl.set_file(dir) if access_acl
          default_acl.set_default(dir) if default_acl
        rescue => error
          @log.warn { "restore_attributes: couldn't restore ACLs: #{error.message}\n" }
        end
      end
      begin 
        File.utime(stat.atime, stat.mtime, dir)
      rescue => error
        @log.warn { "restore_attributes: utime #{dir} got error and didn't restore times': #{error.message}\n" }
      end
    end
    false
  end
end

#run_backup ⇒ Object

hlavni zalohovaci rutina ####



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# File 'lib/lnbackup/backup.rb', line 826

def run_backup
  begin
    @log.info { "running backup #{@backup_name}" }
    
    @skip_excludes = false
    lock_file = nil
    pre_command_ok = true

    @backup_start = Time.now

    @stats = {
      :size   => 0, :total_size => 0, :blocks  => 0,
      :f_same => 0, :f_changed  => 0, :f_new   => 0,
      :file   => 0, :dir        => 0, :symlink => 0, :blockdev => 0, :chardev  => 0, :socket   => 0, :pipe     => 0,
    }

    # POZOR: behovy zamek delame az PO vykonani pre-command

    # podivame se po pripadnem prikazu, ktery bychom meli udelat pred zalohovanim
    if @cur_config.key?(:pre_command)
      ret, out, err = system_catch_stdin_stderr(@cur_config[:pre_command])
      if ret != 0
        @log.fatal { "pre command failed: '#{@cur_config[:pre_command]}" }
        @log.fatal { "\texit code: '#{ret}'" }
        @log.fatal { "\tstdout: #{out}" }
        @log.fatal { "\tstderr: #{err}" }
        pre_command_ok = false
        return PRE_COMMAND_FAILED
      end
    end

    # cilovy adresar pro zalohy je budto gobalni mount_point nebo target_dir
    # vybrane zalohy + datum + (hodina) + nazev zalohy
    pre_dest_tmp = @cur_config.key?(:target_dir) ? @cur_config[:target_dir] : conf_val(:mount_point)
    if not File.directory?(pre_dest_tmp)
      @log.fatal { "backup root '#{pre_dest_tmp}' does not exist" }
      return NO_BACKUP_DIR
    end
    begin
      lock_file_name = File.join(pre_dest_tmp,'LNBACKUP_RUNNING')
      return LNBACKUP_RUNNING if detect_running(lock_file_name)
      lock_file = File.open( lock_file_name, 'w' )
      lock_file.puts($$)
      lock_file.flush
    rescue => e
      return PIDFILE_FAILED
    end

    # udaj o rezervovanem miste bereme prednosti z konkretni zalohy, 
    # pokud neni nakonfigurovan, tak globalne
    files_reserved  = conf_val(:files_reserved)
    blocks_reserved = conf_val(:blocks_reserved)
    @space_calc = FreeSpaceCalc.new( pre_dest_tmp, files_reserved, blocks_reserved, @log )

    dest_tmp = File.join( pre_dest_tmp, 'backup').squeeze('/')
    @log.debug { "dest_tmp: #{dest_tmp}" }

    # nemazeme posledni backup
    @dont_delete = []
    prev_backup = ( all_backups = find_backups )[-1]
    if prev_backup
      @dont_delete << prev_backup.gsub(/\/[^\/]*$/,'')
    end

    @dest = File.join( dest_tmp, 
                       Date.today.backup_dir(@cur_config[:hourly]), 
                       @target_dir_name ).squeeze('/')
    # a nemazeme ani to, co zrovna zalohujeme
    @dont_delete << @dest.gsub(/\/[^\/]*$/,'')

    if File.directory?(@dest)
      @log.fatal { "today's/this hour's backup (#{@dest}) already exists --> exiting" }
      return BACKUP_EXISTS
    else
      begin
        begin
          FileUtils.mkpath(@dest) unless @test_mode
        rescue Errno::ENOSPC
          make_some_space and retry
        end
      rescue => e 
        @log.fatal { "can't make backup dir '#{@dest}'" }
        @log.fatal { "mkpath #{@dest} raised exception #{e.class}:'#{e.message}'" }
        @log.fatal { e.backtrace.join("\n") }
        return NO_BACKUP_DIR
      end
    end

    @log.debug { "previous backup: #{prev_backup}" }
    @log.debug { "dont_delete: #{@dont_delete.join(',')}" }
    
    # adresare je nutno vyrobit, nez do nich nasypeme soubory,
    # ale nastavit jejich atributy musime az po souborech, 
    dirs_to_restore = []

    dirs = Array.new
    dirs_hash = Hash.new
    @cur_config[:dirs].each do |dir|
      tmp_dir = @source_prefix ? File.join( @source_prefix, dir[:dir] ) : dir[:dir]
      dirs << [ rp = realpath(tmp_dir).gsub(/(.)\/+$/,'\1') , dir[:fs_type], dir[:exclude] ]
      dirs_hash[rp] = true
    end

    dirs.each do |path,fs_type,exclude|
      path = File.expand_path(path)

      # inicializace excludes
      @exclude_root = path
      @exclude_list = []
      exclude.each { |ex| set_exclude(ex) } if exclude
      @exclude_list.unshift( [true, /^#{Regexp.escape(dest_tmp)}\/./, true] )
      @exclude_list.unshift( [true, /^#{Regexp.escape(lock_file_name)}$/, true] )
      @log.debug { "Excluding: #{@exclude_list.to_s}" }
      @log.debug { "exclude_root: #{@exclude_root}" }

      # overime, ze zdroj existuje
      begin
        File.stat(path)
      rescue Errno::ENOENT
        @log.error { "path #{path} not found --> skipping from backup" }
        next
      rescue Errno::EACCES
        @log.error { "path #{path} no rights to access file --> skipping from backup" }
        next
      rescue => error
        @log.error { "path #{path} : File.stat got error #{error.class} : #{error.message} --> skipping from backup" }
        next
      end

      # projit cestu, udelat linky a adresare
      @log.debug { "resolving links for #{path}" }
      if path != '/'
        file = path

        total = ''
        file.split(File::SEPARATOR).each do |piece|
          next if piece == ""
          total << File::SEPARATOR + piece
          if File.symlink?(total) then
            begin
              # dokud se jedna o symlink, tak musime linkovat
              do_cp_a(total, File.join(@dest,total))

              total = File.expand_path( File.readlink(total), File.dirname(total) )
            end while File.symlink?(total)
            # a nakonec udelame adresar
          else
            # pokud se nejedna o symlink, udelame adresar
            tgt = File.join(@dest,total).squeeze('/')
            do_cp_dir( total, tgt )
            # ulozime si ho do seznamu pro pozdejsi nastaveni vlastnosti
            dirs_to_restore << [ tgt, File.stat(total), get_access_acl(total), get_default_acl(total), 0 ]
          end
        end
        path = total
      end

      # overime, ze existuje i cesta, kam nas zavedly odkazy a 
      # ulozime si device pro budouci porovnavani
      dev = nil
      begin
        dev = File.stat(path).dev 
      rescue Errno::ENOENT
        @log.error { "path #{path} not found --> skipping from backup" }
        next
      end

      # overime si, ze mame tento adresar zalohovat (napr. home pres nfs)
      @log.debug { "checking fs_type for #{path}" }
      if (fs_type == :local) and (dev <= 700)               # HRUBY ODHAD --> TODO: poradne
        @log.info { "#{path} is not local (dev=#{dev}), skipping" }
        next
      end

      @log.debug { "running on directory #{path}" }
      last_depth = 0
      Find.find3( path ) do |src,depth|
        if @delay_denom
          if @delay and (rand(@delay_denom) == 0)
            sleep(@delay)
          end
        elsif @delay
          sleep(@delay)
        end
        dirs_to_restore = restore_dir_attributes(dirs_to_restore, depth+1) if last_depth>depth
        last_depth = depth
        
        @last_file = src
        src     = File.expand_path('./'+src, '/')
        tmp_src = './' + src
        dest    = File.expand_path(tmp_src, @dest)

        begin
          file_stat = File.lstat(src)
        rescue => error
          @log.error { "can not stat #{src}: #{error.class}: #{error.message} --> skipping from backup" }
          Find.prune
        end
        
        # POZOR !! 
        # nelze volat file_stat.readable?, protoze:
        # irb(main):016:0* File.lstat('/etc/asterisk/cdr_manager.conf').readable?
        # => false
        # irb(main):017:0>
        # irb(main):018:0*
        # irb(main):019:0* File.readable?('/etc/asterisk/cdr_manager.conf')
        # => true
        # irb(main):020:0> system('ls -l /etc/asterisk/cdr_manager.conf')
        # -rw-rw----  1 asterisk asterisk 59 2005-12-08 00:58 /etc/asterisk/cdr_manager.conf
        # => true
        
        # if not file_stat.readable? and not file_stat.symlink?
        if not File.readable?(src) and not file_stat.symlink?
          @log.error { "can not read #{src} --> skipping from backup" }
          Find.prune
        end

        if file_stat.symlink? or file_stat.blockdev? or file_stat.chardev? or 
           file_stat.socket? or file_stat.pipe?
          # symlink, blockdev, chardev, socket, pipe zalohujeme pomoci 'cp -a'
          do_cp_a(src, dest)
          if file_stat.symlink? 
            @stats[:symlink] += 1
          elsif file_stat.blockdev? 
            @stats[:blockdev] += 1
          elsif file_stat.chardev? 
            @stats[:chardev] += 1
          elsif file_stat.socket? 
            @stats[:socket] += 1
          elsif file_stat.pipe?
            @stats[:pipe] += 1
          end
        elsif file_stat.directory?
          # adresar

          # preskocime koren, protoze uz je vytvoren
          if src != path
            # preskocime v pripade vicenasobneho dosazeni stejneho adresare
            Find.prune if dirs_hash.key?(src)
            @stats[:dir] += 1

            do_cp_dir(src, dest)
            # ulozime si ho do seznamu pro pozdejsi nastaveni vlastnosti
            dirs_to_restore << [dest, file_stat, get_access_acl(src), get_default_acl(src), depth]
          end

          # kontrola zastaveni noreni pri zmene device
          if dev != (new_dev = file_stat.dev)
            @log.debug { "filesystem border: #{src} old=#{dev}, new=#{new_dev}" }
            case fs_type
            when :local
              # pri zmene device otestujeme, ze je lokalni
              # konec pokud device neni lokalni
              if new_dev <= 700 # HRUBY ODHAD --> TODO: poradne
                @log.info { "#{src} is not local (dev=#{new_dev}), skipping" }
                Find.prune
              end
              # 0x300 ---> ide
              # 2304  ---> md0
              # 26625 ---> hwraid
              # 9 --> autofs
              # 7 --> pts 
              # 2 --> proc
              # 0xa --> nfs
            when :single
              # single --> koncime, jakmile je podadresar z jineho device
              Find.prune
            when :all
              # all --> bereme vsechno
            end
          end
        else # normalni soubor
          @stats[:file] += 1
          @stats[:total_size] += file_stat.size
          # overime, jestli mame drivejsi zalohu souboru a jestli nebyl zmenen
          backuped = false
          new      = false
          last     = nil
          if prev_backup 
            # hledat file i v predchozich zalohach: viz. TODO OTESTOVAT!!
            #last = File.expand_path(tmp_src, prev_backup)
            #if same_file?(src,last)
            
            # hledame v drivejsich zalohach ...
            last = find_same_prev_backup(src, tmp_src, all_backups)
            if last # last neni ani 'nil', ano 'false'
              do_hardlink(last, src, dest)
              backuped = true
              @stats[:f_same] += 1
            end
          end
          if not backuped
            # pokud jsme prosli az sem, budeme soubor kopirovat
            if do_copy(src,dest)
              if prev_backup
                if last.nil? # nil   --> vubec jsme nenasli
                  @stats[:f_new] += 1
                  @log.debug { "new file: #{src}" }
                else         # false --> nasli jsme, ale byl zmenen
                  @stats[:f_changed] += 1
                  @log.debug { "changed file: #{src}" }
                end
              else
                # nehlasime 'new file' u 1. zaloh
                @stats[:f_new] += 1
              end

              if @test_mode
                # v test modu odhadujeme velikost podle zdroje
                @stats[:size] += file_stat.size
                @stats[:blocks] += file_stat.blocks
              else
                @stats[:size] += File.size(dest)
                @stats[:blocks] += File.stat(dest).blocks
              end
            end
          end
        end
      end
    end
    restore_dir_attributes(dirs_to_restore)

    over_all_status = BACKUP_OK
    
    @log.info { "Backup '#{@target_dir_name}' complete succesfully." }
    print_stats( over_all_status )
  rescue MakeSpaceFailure => e
    return e.code # in this case we return the error code given by exception 
                  # ( possibly ignoring status code from post_command )
  ensure
    if lock_file
      begin
        lock_file.close
      ensure
        File.delete( lock_file_name )
      end
    end

    if pre_command_ok and @cur_config.key?(:post_command)
      ret, out, err = system_catch_stdin_stderr(@cur_config[:post_command])
      if ret != 0
        @log.error { "post command failed: '#{@cur_config[:post_command]}" }
        @log.error { "\texit code: '#{ret}'" }
        @log.error { "\tstdout: #{out}" }
        @log.error { "\tstderr: #{err}" }
        over_all_status = POST_COMMAND_FAILED
      end
    end
  end
  return over_all_status
end

#same_file?(f1, f2) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/lnbackup/backup.rb', line 660

def same_file?(f1, f2)
  begin
    result = ( !File.symlink?(f1) and
               !File.symlink?(f2) and
               File.file?(f1) and
               File.file?(f2) and
               (s1 = File.stat(f1)).size == (s2 = File.stat(f2)).size and
               ( (s1.mtime - s2.mtime) <= 1 ) and
               s1.uid == s2.uid and
               s1.gid == s2.gid and
               s1.mode == s2.mode )

    return result unless result

    if $HAVE_ACL and not @no_acl
      return false unless ACL.from_file(f1).to_text == ACL.from_file(f2).to_text
      # default ACL neresime, protoze tady mame jen soubory
      #return false unless ACL.default(f1).to_text   == ACL.default(f2).to_text
    end
    return true
  rescue => error
    @log.warn { "same_file?(#{f1}, #{f2}) got error and returned false: #{error.message}\n" }
    return false
  end
end

#set_exclude(str, absolute = false) ⇒ Object

absolute=>true bude se matchovat absolutni (cela cesta) absolute=>false bude se matchovat cesta relativni ke klici :dir



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# File 'lib/lnbackup/backup.rb', line 725

def set_exclude(str, absolute=false)
  if str == '!'
    @exclude_list = []
    return
  end
  exclude_pattern = true
  if str =~ /^\+\s*(.*)$/   
    exclude_pattern = false
    str = $1
  elsif str =~ /^-\s*(.*)$/
    exclude_pattern = true
    str = $1
  end
  @exclude_list << [exclude_pattern, Regexp.new('^'+str), absolute]
end

#size2str(size) ⇒ Object 



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# File 'lib/lnbackup/backup.rb', line 1269

def size2str (size)
  size = size.to_i
  if size < 1024
    "#{size} "
  elsif size < 1048576
    "%.1fK" % (size / 1024.0)
  elsif size < 1073741824
    "%.1fM" % (size / 1048576.0)
  else
    "%.1fG" % (size / 1073741824.0)
  end
end

#system_catch_stdin_stderr(*args) ⇒ Object 



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# File 'lib/lnbackup/backup.rb', line 367

def system_catch_stdin_stderr(*args)
  args = args.collect {|a| a.to_s}

  pipe_peer_in, pipe_me_out = IO.pipe
  pipe_me_in, pipe_peer_out = IO.pipe
  pipe_me_error_in, pipe_peer_error_out = IO.pipe

  pid = nil
  begin
    Thread.exclusive do
      STDOUT.flush
      STDERR.flush

      pid = fork {
        STDIN.reopen(pipe_peer_in)
        STDOUT.reopen(pipe_peer_out)
        STDERR.reopen(pipe_peer_error_out)
        pipe_me_out.close
        pipe_me_in.close
        pipe_me_error_in.close

        begin
          exec(*args)
        rescue
          exit!(255)
        end
      }
    end  
  end

  pipe_peer_in.close
  pipe_peer_out.close
  pipe_peer_error_out.close
  pipe_me_out.sync = true

  pipe_me_out.close
  got_stdin = pipe_me_in.read
  pipe_me_in.close unless pipe_me_in.closed?
  got_stderr = pipe_me_error_in.read
  pipe_me_error_in.close unless pipe_me_error_in.closed?

  p, status = Process.waitpid2(pid)
  return [status >> 8, got_stdin, got_stderr]
end

#system_catch_stdin_stderr_with_input(input, *args) ⇒ Object 



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# File 'lib/lnbackup/backup.rb', line 412

def system_catch_stdin_stderr_with_input(input, *args)
  args = args.collect {|a| a.to_s}

  pipe_peer_in, pipe_me_out = IO.pipe
  pipe_me_in, pipe_peer_out = IO.pipe
  pipe_me_error_in, pipe_peer_error_out = IO.pipe

  pid = nil
  begin
    Thread.exclusive do
      STDOUT.flush
      STDERR.flush

      pid = fork {
        STDIN.reopen(pipe_peer_in)
        STDOUT.reopen(pipe_peer_out)
        STDERR.reopen(pipe_peer_error_out)
        pipe_me_out.close
        pipe_me_in.close
        pipe_me_error_in.close

        begin
          exec(*args)
        rescue
          exit!(255)
        end
      }
    end
  end

  pipe_peer_in.close
  pipe_peer_out.close
  pipe_peer_error_out.close

  pipe_me_out.sync = true
  pipe_me_out.print( input ) if input != nil
  pipe_me_out.close
  
  got_stdin = pipe_me_in.read
  pipe_me_in.close unless pipe_me_in.closed?
  got_stderr = pipe_me_error_in.read
  pipe_me_error_in.close unless pipe_me_error_in.closed?

  p, status = Process.waitpid2(pid)
  return [status >> 8, got_stdin, got_stderr]
end

#tune2fs(dev) ⇒ Object

volani tune2fs



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# File 'lib/lnbackup/backup.rb', line 460

def tune2fs(dev)
  @log.debug { "calling tune2fs on #{dev}" }
  if Process.euid != 0
      ret, out, err = system_catch_stdin_stderr( '/usr/bin/sudo', '/sbin/tune2fs', '-l', dev )
  else
      ret, out, err = system_catch_stdin_stderr( '/sbin/tune2fs', '-l', dev )
  end
  if ret != 0
    @log.error { "tune2fs failed with exit code: '#{ret}'" }
    @log.error { "\tstdout: #{out}" }
    @log.error { "\tstderr: #{err}" }
    return {}
  end
  results = {}
  out.split("\n").each do |line|
    if line =~ /^([^:]+):\s*(.*)$/
      results[$1] = $2
    end
  end
  return results
end

#umount_backup(try_ro = false) ⇒ Object

unmount backup return true on success (not mounted or succesfull unmount)



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# File 'lib/lnbackup/backup.rb', line 1758

def umount_backup(try_ro=false)
  device      = conf_val(:device)
  mount_point = conf_val(:mount_point)

  if ! device.to_s.empty? and ! mount_point.to_s.empty?

    mount_status, mount_dev = check_mounted
    if mount_status != :none
      @log.debug { "mount status before umount: device: #{mount_dev}, status: #{mount_status}" }
      @log.debug { "unmounting #{mount_point}" }

      ret, out, err = system_catch_stdin_stderr( '/bin/umount', mount_point )
      if ret != 0
        @log.warn { "umount #{mount_point} failed" }
        @log.warn { "\tstdout: #{out}" }
        @log.warn { "\tstderr: #{err}" }

        if not try_ro
          return false
        else
          # jeste se pokusime o remount,ro
          ret, out, err = system_catch_stdin_stderr( '/bin/mount', '-o', 'remount,rw', mount_point )
          if ret != 0
            @log.warn { "mount -o remount,ro #{mount_point} failed" }
            @log.warn { "\tstdout: #{out}" }
            @log.warn { "\tstderr: #{err}" }
            @log.warn { "backup remained mounted!" }
          end
        end
      end
    end
  end
  return true
end

#umount_fsck_mount ⇒ Object 



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# File 'lib/lnbackup/backup.rb', line 741

def umount_fsck_mount
  if umount_backup
    check_fsck or return print_error_stats( FSCK_FAILED )
  end
  mount_backup or return print_error_stats( MOUNT_FAILED )
  return 0
end