/[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 36 by dpavlin, Mon Jul 16 08:34:47 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 30  my $mount = { Line 30  my $mount = {
30          tmp             => '/dev/shm/comp',          tmp             => '/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;  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;
34    
35  # don't compress files smaller than this  # don't compress files smaller than this
36  my $min_compress_size = 512;  my $min_compress_size = 512;
# Line 47  my $pending; Line 47  my $pending;
47  sub real_name {  sub real_name {
48          my ( $dir, $name ) = @_;          my ( $dir, $name ) = @_;
49          if ( -e "$dir/${name}.gz" ) {          if ( -e "$dir/${name}.gz" ) {
50                  confess "ASSERT: unexpected $dir/$name exists" if -e "$dir/$name";                  cluck "ASSERT: unexpected $dir/$name exists" if -e "$dir/$name";
51                  return "${name}.gz";                  return "${name}.gz";
52          }          }
53          return $name;          if ( $name =~ m/\.gz$/ ) {
54                    return $name . '%';     # protect (mingle) compressed files
55            } else {
56                    return $name;
57            }
58  }  }
59    
60  sub fixup {  sub fixup {
# Line 61  sub fixup { Line 65  sub fixup {
65  sub original_name {  sub original_name {
66          my $p = shift;          my $p = shift;
67          $p =~ s/\.gz$//;          $p =~ s/\.gz$//;
68            $p =~ s/\.gz%$/.gz/;    # demungle compressed .gz files
69          return $p;          return $p;
70  };  };
71    
# Line 146  sub tmp_path { Line 151  sub tmp_path {
151                          if ( -s $path ) {                          if ( -s $path ) {
152                                  file_copy( '<:gzip', $path, '>', $tmp )                                  file_copy( '<:gzip', $path, '>', $tmp )
153                          } else {                          } else {
154                                  confess "ASSERT: filesystem corruption, $path is zero size\n";                                  confess "ASSERT: filesystem corruption, $path is zero size in ",dump( $pending );
155                          }                          }
156                          $path = $tmp;                          $path = $tmp;
157                          $op = 'created';                          $op = 'created';
# Line 155  sub tmp_path { Line 160  sub tmp_path {
160                  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} );
161                  $pending->{$file}->{path} = $path;                  $pending->{$file}->{path} = $path;
162                  $pending->{$file}->{open} = 0;  # not really opened, just uncompressed                  $pending->{$file}->{open} = 0;  # not really opened, just uncompressed
163                  warn "## tmp_file( $file ) $op $path [", -s $path, "]\n";                  warn "## tmp_file( $file ) $op $path [", -s $path, "]\n" if $debug;
164          }          }
165          return $path;          return $path;
166  }  }
# Line 174  sub compress_file2path { Line 179  sub compress_file2path {
179                  } elsif ( ! $path ) {                  } elsif ( ! $path ) {
180                          $path = $pending_path;                          $path = $pending_path;
181                  } elsif ( $pending_path ne $path ) {                  } elsif ( $pending_path ne $path ) {
182                          confess "ASSERT: compressing into $path instead of $pending_path\n";                          confess "ASSERT: compressing into $path instead of $pending_path";
183                  }                  }
184          }          }
185    
# Line 203  sub compress_file2path { Line 208  sub compress_file2path {
208                  my ( $size_path, $size_comp ) = ( -s $path, -s $comp );                  my ( $size_path, $size_comp ) = ( -s $path, -s $comp );
209    
210                  if ( $size_path <= $size_comp ) {                  if ( $size_path <= $size_comp ) {
211                          warn ">>> $size_path <= $size_comp leaving uncompressed\n";                          warn ">>> $size_path <= $size_comp leaving uncompressed $dest\n";
212                          unlink $comp || confess "can't remove: $comp: $!";                          unlink $comp || confess "can't remove: $comp: $!";
213                            file_copy( '<', $path, '>', $dest ) if ( $path ne $dest );
214                  } else {                  } else {
215                          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";
216    
217                          # FIXME add timeout to remove uncompressed version?                          # FIXME add timeout to remove uncompressed version?
218                          unlink $path || confess "can't remove $path: $!";                          unlink $path || confess "can't remove $path: $!";
219    
220                            if ( -e $dest ) {
221                                    warn "## cleanup uncompressed $dest\n" if $debug;
222                                    unlink $dest || confess "can't remove $dest: $!";
223                            }
224                  }                  }
225    
226          }          }
227  }  }
228    
# Line 241  sub x_open { Line 254  sub x_open {
254          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;
255    
256          my $fh;          my $fh;
257            my $rv = 0;
258    
259            if ( ! -w $path ) {
260                    my $old_mode = (stat $path)[2];
261                    my $new_mode = $old_mode | 0600;
262                    chmod $new_mode, $path || confess "can't chmod $new_mode $path";
263                    warn "### modify mode $old_mode -> $new_mode for $path\n";
264                    $pending->{$file}->{mode} = $old_mode;
265            }
266    
267          if ( sysopen($fh , $path, $mode) ) {          if ( sysopen($fh , $path, $mode) ) {
268                  close($fh) || confess "can't close $path: $!";                  close($fh) || confess "can't close $path: $!";
269                  warn "<<< sysopen $path [", -e $path ? -s $path : 'new' , "]\n";                  warn "<<< sysopen $path [", -e $path ? -s $path : 'new' , "]\n";
270                  $pending->{$file}->{open}++;                  $pending->{$file}->{open}++;
                 return 0;  
271          } else {          } else {
272                  warn "ERROR: can't open $path -- $!";                  warn "ERROR: can't open $path -- $!";
273                  return -$!;                  $rv = -$!;
274          }          }
275    
276            return $rv;
277    
278  }  }
279    
280  sub x_read {  sub x_read {
# Line 366  sub x_rename { Line 389  sub x_rename {
389          my $tmp = $mount->{tmp} . '/' . $old;          my $tmp = $mount->{tmp} . '/' . $old;
390          if ( -e $tmp ) {          if ( -e $tmp ) {
391                  if ( $new =~ m#\Q/.fuse_hidden\E# ) {                  if ( $new =~ m#\Q/.fuse_hidden\E# ) {
392                          unlink $tmp || confess "can't unlink $tmp for $new\n";                          unlink $tmp || confess "can't unlink $tmp for $new";
393                  } else {                  } else {
394                          my $new_tmp = $mount->{tmp} . '/' . $new;                          my $new_tmp = $mount->{tmp} . '/' . $new;
395                          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 477  sub x_release {
477    
478          $pending->{$file}->{open}--;          $pending->{$file}->{open}--;
479          if ( $pending->{$file}->{open} == 0 ) {          if ( $pending->{$file}->{open} == 0 ) {
480                  warn "## cleanup pending $file [", -s fixup($file), "]\n" if $debug;  
481                    my $path = fixup( $file );
482    
483                    if ( my $old_mode = $pending->{$file}->{mode} ) {
484                            chmod $old_mode, $path || confess "can't chmod $old_mode $path";
485                            warn "### restored mode $old_mode $path\n";
486    
487                    }
488    
489                    warn "## cleanup pending $file [", -s $path, "]\n" if $debug;
490                  delete( $pending->{$file} );                  delete( $pending->{$file} );
491          }          }
492    
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