Class: FreeSpaceCalc

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

Instance Method Summary collapse

Constructor Details

#initialize(path, free_files = 0, free_blocks = 10, log = nil) ⇒ FreeSpaceCalc

Returns a new instance of FreeSpaceCalc.



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# File 'lib/lnbackup/freespace.rb', line 3

def initialize( path, free_files=0, free_blocks=10, log=nil )
  @log = log
  @stat = FileSystem.stat(path)

  if (free_blocks.class == String) and (free_blocks =~ /^(\d+)%$/)
    free_blocks = @stat.blocks * $1.to_i / 100
  else
    free_blocks = free_blocks.to_i rescue 100
  end
  # vzdy nechame alespon 100 volnych bloku (typicky blok=4kB)
  @free_blocks = free_blocks < 100 ? 100 : free_blocks

  if (free_files.class == String) and (free_files =~ /^(\d+)%$/)
    free_files = @stat.files * $1.to_i / 100
  else
    free_files = free_files.to_i rescue 100
  end
  # vzdy nechame alespon 100 volnych inodu (pokud dojdou, fs se umi prekne 
  # podelat a ani fsck z toho nema radost)
  @free_files = free_files < 100 ? 100 : free_files
end

Instance Method Details

#can_backup?(path) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/lnbackup/freespace.rb', line 46

def can_backup?( path )
  begin
    @stat = FileSystem.stat(@stat.path)
    if Process.euid == 0
      if (@stat.blocks_free < @free_blocks) or (@stat.files_free  < @free_files) or 
         (File.size(path) >= ( @stat.block_size * (@stat.blocks_free-@free_blocks) ))

        @log.debug { "FreeSpaceCalc: (euid=#{Process.euid}) can't backup #{path} size #{File.size(path)}" }
        @log.debug { "FreeSpaceCalc: blocks avail: #{@stat.blocks_free} should have: #{@free_blocks}" }
        @log.debug { "FreeSpaceCalc: files  avail: #{@stat.files_free}  should have: #{@free_files}" }
        return false
      end
    else
      if (@stat.blocks_avail < @free_blocks) or (@stat.files_avail  < @free_files) or
         (File.size(path) >= ( @stat.block_size * (@stat.blocks_avail-@free_blocks) ))

        @log.debug { "FreeSpaceCalc: (euid=#{Process.euid}) can't backup #{path} size #{File.size(path)}" }
        @log.debug { "FreeSpaceCalc: blocks avail: #{@stat.blocks_avail} should have: #{@free_blocks}" }
        @log.debug { "FreeSpaceCalc: files  avail: #{@stat.files_avail}  should have: #{@free_files}" }
        return false
      end
    end
    return true
  rescue Errno::ENOENT # pokud soubor, ktery kontrolujeme prestal existovat, 
                       # podminka je trivialne splnena 
    return true
  end
end

#get_free ⇒ Object 



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# File 'lib/lnbackup/freespace.rb', line 41

def get_free
  @stat = FileSystem.stat(@stat.path)
  return [ @stat.blocks_free, @stat.files_free ]
end

#much_used? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/lnbackup/freespace.rb', line 25

def much_used?
  @stat = FileSystem.stat(@stat.path)
  if Process.euid == 0
    if (@stat.blocks_free < @free_blocks) or (@stat.files_free  < @free_files)
      @log.debug { "FreeSpaceCalc: much used (euid=#{Process.euid}) (#{@stat.blocks_free} < #{@free_blocks}) or (#{@stat.files_free} < #{@free_files})" }
      return true
    end
  else
    if (@stat.blocks_avail < @free_blocks) or (@stat.files_avail  < @free_files)
      @log.debug { "FreeSpaceCalc: much used (euid=#{Process.euid}) (#{@stat.blocks_avail} < #{@free_blocks}) or (#{@stat.files_avail} < #{@free_files})" }
      return true
    end
  end
  return false
end