/[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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Annotation of /fuse-comp.pl

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Revision 28 - (hide annotations)
Tue Jul 10 01:10:49 2007 UTC (12 years, 5 months ago) by dpavlin
File MIME type: text/plain
File size: 12021 byte(s)
ASSERT if uncompressed version also exist,
extracted create_tmp_file and compress_path_dest
1 dpavlin 1 #!/usr/bin/perl -w
2     use strict;
3     use threads;
4     use threads::shared;
5    
6     use Fuse;
7     use POSIX qw(ENOENT ENOSYS EEXIST EPERM O_RDONLY O_RDWR O_APPEND O_CREAT);
8     use Fcntl qw(S_ISBLK S_ISCHR S_ISFIFO SEEK_SET);
9     require 'syscall.ph'; # for SYS_mknod and SYS_lchown
10     use PerlIO::gzip;
11     use File::Path;
12     use Data::Dump qw/dump/;
13 dpavlin 5 use Carp qw/confess/;
14 dpavlin 10 use IO::File;
15 dpavlin 23 use Getopt::Long;
16 dpavlin 1
17 dpavlin 23 my $debug = 0;
18     my $fuse_debug = 0;
19    
20     GetOptions(
21     'debug+' => \$debug,
22     'fuse-debug+' => \$fuse_debug,
23     );
24    
25 dpavlin 1 my $mount = {
26     from => '/tmp/comp',
27     to => '/tmp/no-comp',
28     tmp => '/dev/shm/comp',
29     };
30    
31 dpavlin 4 my $skip_extensions_regex = qr/\.(?:sw[a-z]|gif|png|jpeg|jpg|avi|rar|zip|bz2|gz|tgz|avi|mpeg|mpg|tmp|temp)$/i;
32 dpavlin 1
33 dpavlin 5 # don't compress files smaller than this
34 dpavlin 8 my $min_compress_size = 512;
35 dpavlin 5
36 dpavlin 1 foreach my $dir ( keys %$mount ) {
37     if ( ! -e $mount->{$dir} ) {
38     warn "created $mount->{$dir}\n";
39     mkdir $mount->{$dir} || die "can't create $mount->{$dir}: $!";
40     }
41     }
42    
43     my $pending;
44    
45 dpavlin 27 sub real_name {
46     my ( $dir, $name ) = @_;
47     if ( -e "$dir/${name}.gz" ) {
48 dpavlin 28 confess "ASSERT: unexpected $dir/$name exists" if -e "$dir/$name";
49 dpavlin 27 return "${name}.gz";
50     }
51     return $name;
52     }
53    
54 dpavlin 1 sub fixup {
55     my ( $path ) = @_;
56 dpavlin 27 return $mount->{from} . '/' . real_name( $mount->{from}, $path );
57 dpavlin 1 }
58    
59     sub original_name {
60     my $p = shift;
61     $p =~ s/\.gz$//;
62     return $p;
63     };
64    
65     sub gzip_original_size {
66     my $file = shift;
67    
68     return unless -e $file;
69    
70     my $buff;
71    
72     open(my $fh, $file) || die "can't open $file: $!";
73    
74     # read($fh, $buff, 10 );
75     # print dump( unpack("nccVcc", $buff ) );
76    
77     seek($fh, -4, 2);
78     read($fh, $buff, 4 );
79     close($fh);
80    
81     return unpack("L", $buff);
82     }
83    
84     sub x_getattr {
85     my ($file) = fixup(shift);
86     my (@list) = lstat($file);
87     $list[7] = gzip_original_size( $file ) if ( $list[7] && $file =~ m/\.gz$/ );
88     return -$! unless @list;
89     return @list;
90     }
91    
92     sub x_getdir {
93     my ($dirname) = fixup(shift);
94     unless(opendir(DIRHANDLE,$dirname)) {
95     return -ENOENT();
96     }
97     my @files = map { original_name( $_ ) } readdir(DIRHANDLE);
98     closedir(DIRHANDLE);
99     return (@files, 0);
100     }
101    
102     sub file_copy {
103     my ( $s_opt, $s_path, $d_opt, $d_path ) = @_;
104 dpavlin 19 warn "## file_copy( $s_opt $s_path [",-s $s_path,"] $d_opt $d_path [",-e $d_path ? -s $d_path : 'new',"])\n" if $debug;
105 dpavlin 5 open(my $s, $s_opt, $s_path ) || confess "can't open $s_path: $!\npending = ", dump( $pending );
106     open(my $d, $d_opt, $d_path ) || confess "can't open $d_path: $!";
107 dpavlin 1 my $buff;
108     while( read( $s, $buff, 65535 ) ) {
109 dpavlin 5 print $d $buff || confess "can't write into $d_path: $!";
110 dpavlin 13 warn ">> [", length($buff), "] offset ", tell($s), " -> ", tell($d), "\n" if $debug;
111 dpavlin 1 }
112     close($d) || warn "can't close $d_path: $!";
113     close($s) || warn "can't close $s_path: $!";
114 dpavlin 5 warn "-- $s_path [", -s $s_path, "] >>> $d_path [", -s $d_path, "]\n" if $debug;
115     my ($mode,$uid,$gid,$atime,$mtime) = (stat $s_path)[2,4,5,8,9];
116    
117     chmod $mode, $d_path || warn "chmod( $mode $d_path ) failed: $!\n";
118     chown $uid,$gid,$d_path || warn "chown( $uid $gid $d_path ) failed: $!\n";
119     utime $atime,$mtime,$d_path || warn "utime( $atime $mtime $d_path ) failed: $!\n";
120 dpavlin 8
121     undef $d;
122     undef $s;
123 dpavlin 1 }
124    
125 dpavlin 28 sub create_tmp_file {
126     my $file = shift;
127    
128     my $path = fixup( $file );
129     my $tmp = $mount->{tmp} . '/' . $file;
130     if ( -e $tmp ) {
131     $path = $tmp;
132     } elsif ( $path =~ m/\.gz$/ ) {
133     my $dest_path = $tmp;
134     $dest_path =~ s!/[^/]+$!!; #!vim-fix
135     mkpath $dest_path unless -e $dest_path;
136     if ( -s $path ) {
137     file_copy( '<:gzip', $path, '>', $tmp )
138     } else {
139     warn "ERROR: filesystem corruption, $path is zero size\n";
140     }
141     $path = $tmp;
142     }
143     warn "## create_temp_file( $file ) => $path [", -s $path, "]\n";
144     return $path;
145     }
146    
147     sub compress_path_dest {
148     my ( $path, $dest ) = @_;
149    
150     # cleanup old compressed copy
151     if ( $dest =~ /\.gz$/ ) {
152     warn "## remove old $dest\n";
153     unlink $dest || confess "can't remove $dest: $!";
154     $dest =~ s/\.gz$//;
155     }
156    
157     if ( $path =~ $skip_extensions_regex ) {
158     warn "$path [",-s $path,"] skipped compression\n";
159     file_copy( '<', $path, '>', $dest ) if ( $path ne $dest );
160     } elsif ( -s $path < $min_compress_size ) {
161     warn "$path [",-s $path,"] uncompressed, too small\n";
162     file_copy( '<', $path, '>', $dest ) if ( $path ne $dest );
163     } else {
164     warn "$path [",-s $path,"] compressing\n";
165    
166     my $comp = $dest . '.gz';
167     file_copy( '<', $path, '>:gzip', $comp );
168    
169     my ( $size_path, $size_comp ) = ( -s $path, -s $comp );
170    
171     if ( $size_path <= $size_comp ) {
172     warn ">>> $size_path <= $size_comp leaving uncompressed\n";
173     unlink $comp || confess "can't remove: $comp: $!";
174     } else {
175     warn ">>> compressed $size_path -> $size_comp ",int(($size_comp * 100) / $size_path),"%\n";
176     # FIXME add timeout to remove uncompressed version?
177     unlink $path || confess "can't remove $path: $!";
178     }
179     }
180     }
181    
182 dpavlin 1 sub x_open {
183     my ($file) = shift;
184     my ($mode) = shift;
185 dpavlin 12
186     if ( $file eq '/.debug' ) {
187     my $path = $mount->{from} . '/.debug';
188     open( my $debug, '>', $path ) || die "can't open $path: $!";
189     my $dump = dump( $pending );
190     print $debug "pending = $dump\n";
191     close($debug);
192     $pending->{'/.debug'}->{path} = $path;
193     warn "## created dump $path $dump\n";
194     return 0;
195     }
196    
197 dpavlin 1 $pending->{$file}->{open}++;
198 dpavlin 8
199     my $mode_desc = {
200     rdonly => $mode && O_RDONLY,
201     rdwr => $mode && O_RDWR,
202     append => $mode && O_APPEND,
203     create => $mode && O_CREAT,
204 dpavlin 14 trunc => $mode && O_TRUNC,
205 dpavlin 8 };
206 dpavlin 28
207     my $path = create_tmp_file( $file );
208    
209 dpavlin 19 warn "## open( $file, $mode ) pending: ", $pending->{$file}->{open}, " mode $mode: ", dump( $mode_desc )," $path [", -s $path, "]\n" if $debug;
210 dpavlin 28
211 dpavlin 1 my $fh;
212 dpavlin 8
213 dpavlin 21 if ( sysopen($fh , $path, $mode) ) {
214     close($fh) || confess "can't close $path: $!";
215     warn "<<< open $path [", -e $path ? -s $path : 'new' , "]\n";
216     $pending->{$file}->{path} = $path;
217     return 0;
218     } else {
219 dpavlin 26 warn "ERROR: can't open $path -- $!";
220 dpavlin 21 return -$!;
221     }
222    
223 dpavlin 1 }
224    
225     sub x_read {
226     my ($file,$bufsize,$off) = @_;
227     my ($rv) = -ENOSYS();
228     my $path = fixup( $file );
229 dpavlin 10
230 dpavlin 12 confess "no pending file $file ", dump( $pending ) unless defined( $pending->{$file} );
231    
232 dpavlin 1 return -ENOENT() unless -e $path;
233 dpavlin 10
234     my $fh = new IO::File;
235     return -ENOSYS() unless open($fh,$pending->{$file}->{path});
236    
237 dpavlin 1 if(seek($fh,$off,SEEK_SET)) {
238     read($fh,$rv,$bufsize);
239     }
240 dpavlin 10
241 dpavlin 1 return $rv;
242     }
243    
244     sub x_write {
245     my ($file,$buf,$off) = @_;
246 dpavlin 25
247 dpavlin 10 my $rv;
248 dpavlin 1 my $path = fixup($file);
249 dpavlin 10
250 dpavlin 12 confess "no pending file $file ", dump( $pending ) unless defined( $pending->{$file} );
251    
252 dpavlin 1 return -ENOENT() unless -e $path;
253 dpavlin 10
254 dpavlin 26 $path = $pending->{$file}->{path} || confess "no path for $file in ", dump( $pending );
255     confess "write into non-existant $path for $file: $!" unless -e $path;
256    
257 dpavlin 10 my $fh = new IO::File;
258 dpavlin 26 return -ENOSYS() unless open($fh,'+<',$path);
259 dpavlin 1 if($rv = seek( $fh ,$off,SEEK_SET)) {
260     $rv = print( $fh $buf );
261 dpavlin 26 warn "## write $path offset $off [",length( $buf ), "]\n" if $debug;
262     $pending->{$file}->{write}++;
263 dpavlin 1 }
264     $rv = -ENOSYS() unless $rv;
265 dpavlin 26 close($fh) || warn "can't close $path: $!";
266 dpavlin 1 return length($buf);
267     }
268    
269     sub err { return (-shift || -$!) }
270    
271 dpavlin 27 sub x_readlink { return readlink(fixup(shift)); }
272    
273 dpavlin 25 sub x_unlink {
274     my $file = shift;
275     my $path = fixup( $file );
276 dpavlin 1
277 dpavlin 25 if ( $file =~ m#\Q/.fuse_hidden\E# ) {
278     return unlink $path ? 0 : -$1;
279     }
280    
281     warn "# unlink( $file )\n";
282    
283     unlink $path || return 0;
284    
285     my $tmp = $mount->{tmp} . '/' . $file;
286     unlink $tmp if ( -e $tmp );
287    
288     delete( $pending->{$file} );
289     return 0;
290     }
291    
292 dpavlin 27 sub x_symlink {
293     my ($from,$to) = @_;
294 dpavlin 1
295 dpavlin 27 my $from_path = $from; #fixup( $from );
296     my $to_path = fixup( $to );
297    
298     my $rv = symlink( $from_path, $to_path ) ? 0 : -$!;
299     warn "# symlink( $from_path -> $to_path ) = $rv\n" if $debug;
300    
301     my $tmp = $mount->{tmp} . '/' . $from;
302     if ( -e $tmp ) {
303     my $tmp_to = $mount->{$tmp} . '/' . $to;
304     symlink( $tmp, $tmp_to ) || confess "can't symlink $tmp -> $tmp_to: $!";
305     }
306     return $rv;
307     }
308    
309     sub x_link {
310     my ($from,$to) = @_;
311    
312     my $from_path = fixup($from);
313     my $to_path = fixup($to);
314     $to_path .= '.gz' if ( $from_path =~ m/\.gz$/ && $to_path !~ m/\.gz$/ );
315    
316     my $rv = link( $from_path, $to_path ) ? 0 : -$!;
317    
318     warn "# link( $from_path -> $to_path ) = $rv\n" if $debug;
319    
320     return $rv;
321     }
322    
323 dpavlin 1 sub x_rename {
324 dpavlin 18 my ($old,$new) = @_;
325     my $old_path = fixup($old);
326     my $new_path = fixup($new);
327     $new_path .= '.gz' if ( $old_path =~ m/\.gz$/ && $new_path !~ m/\.gz$/ );
328    
329     my $err = rename($old_path,$new_path) ? 0 : -ENOENT();
330     warn "## rename( $old_path => $new_path ) = $err\n";
331    
332     my $tmp = $mount->{tmp} . '/' . $old;
333     if ( -e $tmp ) {
334 dpavlin 25 if ( $new =~ m#\Q/.fuse_hidden\E# ) {
335     unlink $tmp || confess "can't unlink $tmp for $new\n";
336     } else {
337     my $new_tmp = $mount->{tmp} . '/' . $new;
338     rename $tmp, $new_tmp || confess "can't rename $tmp -> $new_tmp : $!";
339     }
340 dpavlin 18 }
341    
342 dpavlin 20 if (defined( $pending->{$old} )) {
343     $pending->{$new} = $pending->{$old};
344    
345     my $path = $pending->{$old}->{path};
346     $path =~ s/\Q$old\E/$new/;
347     $pending->{$new}->{path} = $path;
348    
349 dpavlin 25 delete( $pending->{$old} );
350     warn "## tweaking pending to ", dump( $pending ) if $debug;
351 dpavlin 20 }
352    
353 dpavlin 1 return $err;
354     }
355    
356     sub x_chown {
357 dpavlin 26 my ($file,$uid,$gid) = @_;
358     my $path = fixup($file);
359 dpavlin 1 print "nonexistent $path\n" unless -e $path;
360     # perl's chown() does not chown symlinks, it chowns the symlink's
361     # target. it fails when the link's target doesn't exist, because
362     # the stat64() syscall fails.
363     # this causes error messages when unpacking symlinks in tarballs.
364     my ($err) = syscall(&SYS_lchown,$path,$uid,$gid,$path) ? -$! : 0;
365 dpavlin 26
366     my $tmp = $mount->{tmp} . '/' . $file;
367     syscall(&SYS_lchown,$file,$uid,$gid,$path) if -e $tmp;
368    
369 dpavlin 1 return $err;
370     }
371    
372     sub x_chmod {
373     my ($path) = fixup(shift);
374     my ($mode) = shift;
375     my ($err) = chmod($mode,$path) ? 0 : -$!;
376     return $err;
377     }
378    
379 dpavlin 14 sub x_truncate {
380     my ( $file,$size ) = @_;
381 dpavlin 28
382     #confess "no pending file $file to truncate in ", dump( $pending ) unless defined( $pending->{$file} );
383    
384     my $path;
385    
386     if (defined( $pending->{$file} )) {
387     $pending->{$file}->{write}++;
388     $path = fixup( $file );
389     } else {
390     $path = create_tmp_file( $file );
391     compress_path_dest( $path, fixup( $file ) );
392     }
393 dpavlin 14 my $rv = truncate( $path, $size ) ? 0 : -$! ;
394 dpavlin 21 warn "## truncate( $file $size ) $path [", -s $path, "] = $rv\n" if $debug;
395 dpavlin 27
396 dpavlin 14 return $rv;
397     }
398 dpavlin 28
399 dpavlin 1 sub x_utime { return utime($_[1],$_[2],fixup($_[0])) ? 0:-$!; }
400    
401     sub x_mkdir { my ($name, $perm) = @_; return 0 if mkdir(fixup($name),$perm); return -$!; }
402     sub x_rmdir { return 0 if rmdir fixup(shift); return -$!; }
403    
404     sub x_mknod {
405     # since this is called for ALL files, not just devices, I'll do some checks
406     # and possibly run the real mknod command.
407     my ($file, $modes, $dev) = @_;
408     $file = fixup($file);
409     $! = 0;
410     syscall(&SYS_mknod,$file,$modes,$dev);
411     return -$!;
412     }
413    
414     sub x_release {
415     my ( $file, $mode ) = @_;
416 dpavlin 25
417     if ( $file =~ m#\Q/.fuse_hidden\E# ) {
418     warn "release internal $file\n" if $debug;
419     delete( $pending->{$file} );
420     return 0;
421     }
422    
423 dpavlin 1 if ( ! defined( $pending->{$file} ) ) {
424     warn "release $file, NO PENDING DATA\n";
425     return 0;
426     } elsif ( ! defined( $pending->{$file}->{write} ) ) {
427     warn "release $file, not written into\n";
428     } elsif ( defined( $pending->{$file}->{open} ) && $pending->{$file}->{open} == 1 ) {
429 dpavlin 5 my $path = $pending->{$file}->{path} || confess "no path for $file ? ", dump( $pending );
430     my $dest = fixup( $file );
431 dpavlin 28 compress_path_dest( $path, $dest );
432 dpavlin 5
433 dpavlin 1 } else {
434     warn "release $file, but still used ", $pending->{$file}->{open} , " times, delaying compression\n";
435     }
436 dpavlin 13 $pending->{$file}->{open}--;
437     if ( $pending->{$file}->{open} == 0 ) {
438     warn "## cleanup pending $file [", -s fixup($file), "]\n" if $debug;
439     delete( $pending->{$file} );
440     }
441 dpavlin 1 return 0;
442     }
443    
444     # kludge
445     sub x_statfs {return 255,1000000,500000,1000000,500000,4096}
446     Fuse::main(
447     mountpoint=>$mount->{to},
448     getattr =>"main::x_getattr",
449     readlink=>"main::x_readlink",
450     getdir =>"main::x_getdir",
451     mknod =>"main::x_mknod",
452     mkdir =>"main::x_mkdir",
453     unlink =>"main::x_unlink",
454     rmdir =>"main::x_rmdir",
455     symlink =>"main::x_symlink",
456     rename =>"main::x_rename",
457     link =>"main::x_link",
458     chmod =>"main::x_chmod",
459     chown =>"main::x_chown",
460     truncate=>"main::x_truncate",
461     utime =>"main::x_utime",
462     open =>"main::x_open",
463     read =>"main::x_read",
464     write =>"main::x_write",
465     statfs =>"main::x_statfs",
466     release =>"main::x_release",
467     # threaded=>1,
468 dpavlin 23 debug => $fuse_debug,
469 dpavlin 1 );

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