/[fuse-comp]/fuse-comp.pl
This is repository of my old source code which isn't updated any more. Go to git.rot13.org for current projects!
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revision 29 by dpavlin, Tue Jul 10 02:57:03 2007 UTC revision 38 by dpavlin, Sun Sep 2 11:38:59 2007 UTC
# Line 10  require 'syscall.ph'; # for SYS_mknod an Line 10  require 'syscall.ph'; # for SYS_mknod an
10  use PerlIO::gzip;  use PerlIO::gzip;
11  use File::Path;  use File::Path;
12  use Data::Dump qw/dump/;  use Data::Dump qw/dump/;
13  use Carp qw/confess/;  use Carp qw/confess cluck/;
14  use IO::File;  use IO::File;
15  use Getopt::Long;  use Getopt::Long;
16    
# Line 25  GetOptions( Line 25  GetOptions(
25  );  );
26    
27  my $mount = {  my $mount = {
28          from    => '/tmp/comp',          from    => shift @ARGV || '/tmp/comp',
29          to              => '/tmp/no-comp',          to              => shift @ARGV || '/tmp/no-comp',
30          tmp             => '/dev/shm/comp',          tmp             => shift @ARGV || '/dev/shm/comp',
31  };  };
32    
33  my $skip_extensions_regex = qr/\.(?:sw[a-z]|gif|png|jpeg|jpg|avi|rar|zip|bz2|gz|tgz|avi|mpeg|mpg|tmp|temp)$/i;  warn "mount $mount->{from} to $mount->{to} using $mount->{tmp} as cache\n";
34    
35    my $skip_extensions_regex = qr/gz|gz%|\.(?:sw[a-z]|gif|png|jpeg|jpg|avi|rar|zip|bz2|tgz|avi|mpeg|mpg|tmp|temp)$/i;
36    
37  # don't compress files smaller than this  # don't compress files smaller than this
38  my $min_compress_size = 512;  my $min_compress_size = 512;
# Line 47  my $pending; Line 49  my $pending;
49  sub real_name {  sub real_name {
50          my ( $dir, $name ) = @_;          my ( $dir, $name ) = @_;
51          if ( -e "$dir/${name}.gz" ) {          if ( -e "$dir/${name}.gz" ) {
52                  confess "ASSERT: unexpected $dir/$name exists" if -e "$dir/$name";                  cluck "ASSERT: unexpected $dir/$name exists" if -e "$dir/$name";
53                  return "${name}.gz";                  return "${name}.gz";
54          }          }
55          return $name;          if ( $name =~ m/\.gz$/ ) {
56                    return $name . '%';     # protect (mingle) compressed files
57            } else {
58                    return $name;
59            }
60  }  }
61    
62  sub fixup {  sub fixup {
# Line 61  sub fixup { Line 67  sub fixup {
67  sub original_name {  sub original_name {
68          my $p = shift;          my $p = shift;
69          $p =~ s/\.gz$//;          $p =~ s/\.gz$//;
70            $p =~ s/\.gz%$/.gz/;    # demungle compressed .gz files
71          return $p;          return $p;
72  };  };
73    
# Line 146  sub tmp_path { Line 153  sub tmp_path {
153                          if ( -s $path ) {                          if ( -s $path ) {
154                                  file_copy( '<:gzip', $path, '>', $tmp )                                  file_copy( '<:gzip', $path, '>', $tmp )
155                          } else {                          } else {
156                                  confess "ASSERT: filesystem corruption, $path is zero size\n";                                  confess "ASSERT: filesystem corruption, $path is zero size in ",dump( $pending );
157                          }                          }
158                          $path = $tmp;                          $path = $tmp;
159                          $op = 'created';                          $op = 'created';
# Line 155  sub tmp_path { Line 162  sub tmp_path {
162                  confess "ASSERT: open shouldn't exist for $file in ", dump( $pending ) if defined( $pending->{$file}->{open} );                  confess "ASSERT: open shouldn't exist for $file in ", dump( $pending ) if defined( $pending->{$file}->{open} );
163                  $pending->{$file}->{path} = $path;                  $pending->{$file}->{path} = $path;
164                  $pending->{$file}->{open} = 0;  # not really opened, just uncompressed                  $pending->{$file}->{open} = 0;  # not really opened, just uncompressed
165                  warn "## tmp_file( $file ) $op $path [", -s $path, "]\n";                  warn "## tmp_file( $file ) $op $path [", -s $path, "]\n" if $debug;
166          }          }
167          return $path;          return $path;
168  }  }
# Line 174  sub compress_file2path { Line 181  sub compress_file2path {
181                  } elsif ( ! $path ) {                  } elsif ( ! $path ) {
182                          $path = $pending_path;                          $path = $pending_path;
183                  } elsif ( $pending_path ne $path ) {                  } elsif ( $pending_path ne $path ) {
184                          confess "ASSERT: compressing into $path instead of $pending_path\n";                          confess "ASSERT: compressing into $path instead of $pending_path";
185                  }                  }
186          }          }
187    
# Line 203  sub compress_file2path { Line 210  sub compress_file2path {
210                  my ( $size_path, $size_comp ) = ( -s $path, -s $comp );                  my ( $size_path, $size_comp ) = ( -s $path, -s $comp );
211    
212                  if ( $size_path <= $size_comp ) {                  if ( $size_path <= $size_comp ) {
213                          warn ">>> $size_path <= $size_comp leaving uncompressed\n";                          warn ">>> $size_path <= $size_comp leaving uncompressed $dest\n";
214                          unlink $comp || confess "can't remove: $comp: $!";                          unlink $comp || confess "can't remove: $comp: $!";
215                            file_copy( '<', $path, '>', $dest ) if ( $path ne $dest );
216                  } else {                  } else {
217                          warn ">>> compressed $size_path -> $size_comp ",int(($size_comp * 100) / $size_path),"% $comp\n";                          warn ">>> compressed $size_path -> $size_comp ",int(($size_comp * 100) / $size_path),"% $comp\n";
218    
219                          # FIXME add timeout to remove uncompressed version?                          # FIXME add timeout to remove uncompressed version?
220                          unlink $path || confess "can't remove $path: $!";                          unlink $path || confess "can't remove $path: $!";
221    
222                            if ( -e $dest ) {
223                                    warn "## cleanup uncompressed $dest\n" if $debug;
224                                    unlink $dest || confess "can't remove $dest: $!";
225                            }
226                  }                  }
227    
228          }          }
229  }  }
230    
# Line 241  sub x_open { Line 256  sub x_open {
256          warn "## open( $file, $mode ) pending: ", $pending->{$file}->{open}, " mode $mode: ", dump( $mode_desc )," $path [", -s $path, "]\n" if $debug;          warn "## open( $file, $mode ) pending: ", $pending->{$file}->{open}, " mode $mode: ", dump( $mode_desc )," $path [", -s $path, "]\n" if $debug;
257    
258          my $fh;          my $fh;
259            my $rv = 0;
260    
261            if ( ! -w $path ) {
262                    my $old_mode = (stat $path)[2];
263                    my $new_mode = $old_mode | 0600;
264                    chmod $new_mode, $path || confess "can't chmod $new_mode $path";
265                    warn "### modify mode $old_mode -> $new_mode for $path\n";
266                    $pending->{$file}->{mode} = $old_mode;
267            }
268    
269          if ( sysopen($fh , $path, $mode) ) {          if ( sysopen($fh , $path, $mode) ) {
270                  close($fh) || confess "can't close $path: $!";                  close($fh) || confess "can't close $path: $!";
271                  warn "<<< sysopen $path [", -e $path ? -s $path : 'new' , "]\n";                  warn "<<< sysopen $path [", -e $path ? -s $path : 'new' , "]\n";
272                  $pending->{$file}->{open}++;                  $pending->{$file}->{open}++;
                 return 0;  
273          } else {          } else {
274                  warn "ERROR: can't open $path -- $!";                  warn "ERROR: can't open $path -- $!";
275                  return -$!;                  $rv = -$!;
276          }          }
277    
278            return $rv;
279    
280  }  }
281    
282  sub x_read {  sub x_read {
# Line 366  sub x_rename { Line 391  sub x_rename {
391          my $tmp = $mount->{tmp} . '/' . $old;          my $tmp = $mount->{tmp} . '/' . $old;
392          if ( -e $tmp ) {          if ( -e $tmp ) {
393                  if ( $new =~ m#\Q/.fuse_hidden\E# ) {                  if ( $new =~ m#\Q/.fuse_hidden\E# ) {
394                          unlink $tmp || confess "can't unlink $tmp for $new\n";                          unlink $tmp || confess "can't unlink $tmp for $new";
395                  } else {                  } else {
396                          my $new_tmp = $mount->{tmp} . '/' . $new;                          my $new_tmp = $mount->{tmp} . '/' . $new;
397                          rename $tmp, $new_tmp || confess "can't rename $tmp -> $new_tmp : $!";                          rename $tmp, $new_tmp || confess "can't rename $tmp -> $new_tmp : $!";
# Line 454  sub x_release { Line 479  sub x_release {
479    
480          $pending->{$file}->{open}--;          $pending->{$file}->{open}--;
481          if ( $pending->{$file}->{open} == 0 ) {          if ( $pending->{$file}->{open} == 0 ) {
482                  warn "## cleanup pending $file [", -s fixup($file), "]\n" if $debug;  
483                    my $path = fixup( $file );
484    
485                    if ( my $old_mode = $pending->{$file}->{mode} ) {
486                            chmod $old_mode, $path || confess "can't chmod $old_mode $path";
487                            warn "### restored mode $old_mode $path\n";
488    
489                    }
490    
491                    warn "## cleanup pending $file [", -s $path, "]\n" if $debug;
492                  delete( $pending->{$file} );                  delete( $pending->{$file} );
493          }          }
494    
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