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Spray randomly created/checksummed extended attributes across a filesystem.
If invoked as fill2attr_check, recompute and verify checksums for extended attributes
of all listed files (either on stdin or in the files specified on the command line).

#!/usr/bin/perl -w
#

#
#  Copyright (c) 2000 Silicon Graphics, Inc.  All Rights Reserved.
#  
#  This program is free software; you can redistribute it and/or modify it
#  under the terms of version 2 of the GNU General Public License as
#  published by the Free Software Foundation.
#  
#  This program is distributed in the hope that it would be useful, but
#  WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
#  
#  Further, this software is distributed without any warranty that it is
#  free of the rightful claim of any third person regarding infringement
#  or the like.  Any license provided herein, whether implied or
#  otherwise, applies only to this software file.  Patent licenses, if
#  any, provided herein do not apply to combinations of this program with
#  other software, or any other product whatsoever.
#  
#  You should have received a copy of the GNU General Public License along
#  with this program; if not, write the Free Software Foundation, Inc., 59
#  Temple Place - Suite 330, Boston MA 02111-1307, USA.
#  
#  Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
#  Mountain View, CA  94043, or:
#  
#  http://www.sgi.com 
#  
#  For further information regarding this notice, see: 
#  
#  http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
#
#

#
# fill2attr:
#
#   $Id$
#

use File::Basename;


# returns numbers with a normal distribution
sub normal {
  my($mean) = $_[0];
  my($stddev) = $_[1];
  
  $x = -6.0;
  for (my $i = 0; $i < 12; $i++) {
    $x += rand;
  }
  
  $x = $mean + $stddev * $x;
  return $x;
}


#
# determine script location and find fill2
#
chomp($cwd = `pwd`);
chomp($_ = `which fill2 2>&1 | head -1`);
if (-x $_) {
  # look in the path
  $fill2 = fill2;
}
else {
  # in the same directory - get absolute path
  chomp($dirname = dirname $0);
  if ($dirname =~ m!^/.*!) {
    $fill2 = $dirname . "/fill2";
  }
  else {
    # relative
    $fill2 = $cwd . "/" . $dirname . "/fill2";
  }    
  if (! -x $fill2) {
    die("Error: $0: can't find fill2, tried \"$fill2\"\n");
  }
}


# for each file attach a random number of attributes
# each filled with a random amount of data
# attribute name is the checksum of the data stored within
# the attribute

$status = 0;			# return status

while (<>) {
  
  chomp($file = $_);
  die("Error: $0: $file not found\n")
    if ( ! -e $file);
  
  if ($0 =~ /fill2attr$/) {

    # attach attributes to this file
    my $num = abs(int(normal(3, 1)));
    my $seed = 1;
    my $verbose = 1;
    my $tmp = "/tmp/fill2attr$$";
    
    for (my $i = 0; $i < $num; $i++) {
      my $size = abs(int(normal(256, 200)));
      my $cmd = "$fill2 -d nbytes=$size,linelength=72,seed=$seed -b 4k $tmp";
      $cmd .= " > /dev/null 2>&1" if (! $verbose);
      
      if (system($cmd) != 0) {
	die("Error $0: can't create $tmp\n");
      }
      
      chomp($_ = `sum -r $tmp`);
      ($sum) = split(/\s+/);
      if (system("cat $tmp | attr -s $sum $file > /dev/null 2>&1") != 0) {
	die("Error $0: could not attach attribute:\n" . `cat $tmp` . "\n");
      }
    }
  }
  elsif ($0 =~ /fill2attr_check/) {

    # get the attributes for this file
    $cmd = "attr -q -l $file |";
    open LIST, $cmd;
    @labels = <LIST>;
    close LIST or die("Error listing attributes: $!");
    chomp(@labels);

    # check attribute contents
    foreach my $label (@labels) {
      ($sum) = split(/\s+/, `attr -q -g $label $file | sum -r`);
      if ($sum ne $label) {
	warn("Attribute \"$label\" does not match " .
	     "attribute contents for file $file\n");
	$status = 1;
      }
    }
  }
}

exit($status);