/[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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Contents of /fuse-comp.pl

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Revision 34 - (show annotations)
Mon Jul 16 07:51:20 2007 UTC (12 years, 2 months ago) by dpavlin
File MIME type: text/plain
File size: 13128 byte(s)
mungle compressed files (ending in .gz) by adding % to original .gz extension.
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 use Carp qw/confess/;
14 use IO::File;
15 use Getopt::Long;
16
17 my $debug = 0;
18 my $fuse_debug = 0;
19 my $stats = 1;
20
21 GetOptions(
22 'debug+' => \$debug,
23 'fuse-debug+' => \$fuse_debug,
24 'stats!' => \$stats,
25 );
26
27 my $mount = {
28 from => '/tmp/comp',
29 to => '/tmp/no-comp',
30 tmp => '/dev/shm/comp',
31 };
32
33 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
36 my $min_compress_size = 512;
37
38 foreach my $dir ( keys %$mount ) {
39 if ( ! -e $mount->{$dir} ) {
40 warn "created $mount->{$dir}\n";
41 mkdir $mount->{$dir} || die "can't create $mount->{$dir}: $!";
42 }
43 }
44
45 my $pending;
46
47 sub real_name {
48 my ( $dir, $name ) = @_;
49 if ( -e "$dir/${name}.gz" ) {
50 confess "ASSERT: unexpected $dir/$name exists" if -e "$dir/$name";
51 return "${name}.gz";
52 }
53 if ( $name =~ m/\.gz$/ ) {
54 return $name . '%'; # protect (mingle) compressed files
55 } else {
56 return $name;
57 }
58 }
59
60 sub fixup {
61 my ( $path ) = @_;
62 return $mount->{from} . '/' . real_name( $mount->{from}, $path );
63 }
64
65 sub original_name {
66 my $p = shift;
67 $p =~ s/\.gz$//;
68 $p =~ s/\.gz%$/.gz/; # demungle compressed .gz files
69 return $p;
70 };
71
72 sub gzip_original_size {
73 my $file = shift;
74
75 return unless -e $file;
76
77 my $buff;
78
79 open(my $fh, $file) || die "can't open $file: $!";
80
81 # read($fh, $buff, 10 );
82 # print dump( unpack("nccVcc", $buff ) );
83
84 seek($fh, -4, 2);
85 read($fh, $buff, 4 );
86 close($fh);
87
88 return unpack("L", $buff);
89 }
90
91 sub x_getattr {
92 my ($file) = fixup(shift);
93 my (@list) = lstat($file);
94 $list[7] = gzip_original_size( $file ) if ( $list[7] && $file =~ m/\.gz$/ );
95 return -$! unless @list;
96 return @list;
97 }
98
99 sub x_getdir {
100 my ($dirname) = fixup(shift);
101 unless(opendir(DIRHANDLE,$dirname)) {
102 return -ENOENT();
103 }
104 my @files = map { original_name( $_ ) } readdir(DIRHANDLE);
105 closedir(DIRHANDLE);
106 return (@files, 0);
107 }
108
109 sub file_copy {
110 my ( $s_opt, $s_path, $d_opt, $d_path ) = @_;
111 warn "## file_copy( $s_opt $s_path [",-s $s_path,"] $d_opt $d_path [",-e $d_path ? -s $d_path : 'new',"])\n" if $debug;
112 open(my $s, $s_opt, $s_path ) || confess "can't open $s_path: $!\npending = ", dump( $pending );
113 open(my $d, $d_opt, $d_path ) || confess "can't open $d_path: $!";
114 my $buff;
115 while( read( $s, $buff, 65535 ) ) {
116 print $d $buff || confess "can't write into $d_path: $!";
117 warn ">> [", length($buff), "] offset ", tell($s), " -> ", tell($d), "\n" if $debug;
118 }
119 close($d) || warn "can't close $d_path: $!";
120 close($s) || warn "can't close $s_path: $!";
121 warn "-- $s_path [", -s $s_path, "] >>> $d_path [", -s $d_path, "]\n" if $debug;
122 my ($mode,$uid,$gid,$atime,$mtime) = (stat $s_path)[2,4,5,8,9];
123
124 chmod $mode, $d_path || warn "chmod( $mode $d_path ) failed: $!\n";
125 chown $uid,$gid,$d_path || warn "chown( $uid $gid $d_path ) failed: $!\n";
126 utime $atime,$mtime,$d_path || warn "utime( $atime $mtime $d_path ) failed: $!\n";
127
128 undef $d;
129 undef $s;
130 }
131
132 sub tmp_path {
133 my $file = shift;
134
135 my $path = fixup( $file );
136
137 my $op = 'UNKNOWN';
138
139 if (defined( $pending->{$file} )) {
140 $path = $pending->{$file}->{path} || confess "no path for $file in ",dump( $pending );
141 $op = 'opened';
142 } else {
143 my $tmp = $mount->{tmp} . '/' . $file;
144 if ( -e $tmp ) {
145 $path = $tmp;
146 $op = 'existing';
147 } elsif ( $path =~ m/\.gz$/ ) {
148 my $dest_path = $tmp;
149 $dest_path =~ s!/[^/]+$!!; #!vim-fix
150 mkpath $dest_path unless -e $dest_path;
151 if ( -s $path ) {
152 file_copy( '<:gzip', $path, '>', $tmp )
153 } else {
154 confess "ASSERT: filesystem corruption, $path is zero size in ",dump( $pending );
155 }
156 $path = $tmp;
157 $op = 'created';
158 }
159 confess "ASSERT: path shouldn't exist for $file in ", dump( $pending ) if defined( $pending->{$file}->{path} );
160 confess "ASSERT: open shouldn't exist for $file in ", dump( $pending ) if defined( $pending->{$file}->{open} );
161 $pending->{$file}->{path} = $path;
162 $pending->{$file}->{open} = 0; # not really opened, just uncompressed
163 warn "## tmp_file( $file ) $op $path [", -s $path, "]\n" if $debug;
164 }
165 return $path;
166 }
167
168 sub compress_file2path {
169 my ( $file, $path ) = @_;
170
171 my $dest = fixup( $file );
172
173 if ( defined($pending->{$file}) ) {
174 my $pending_path = $pending->{$file}->{path} || confess "no path for $file in ",dump( $pending );
175
176 if ( $pending->{$file}->{open} > 1 ) {
177 warn "$file used ", $pending->{$file}->{open}, " times, delaying compression\n";
178 return;
179 } elsif ( ! $path ) {
180 $path = $pending_path;
181 } elsif ( $pending_path ne $path ) {
182 confess "ASSERT: compressing into $path instead of $pending_path";
183 }
184 }
185
186 confess "need path" unless $path;
187
188 # cleanup old compressed copy
189 if ( $dest =~ /\.gz$/ ) {
190 warn "## remove old $dest\n";
191 unlink $dest || confess "can't remove $dest: $!";
192 $dest =~ s/\.gz$//;
193 confess "ASSERT: uncompressed $dest shouldn't exist!" if -e $dest;
194 }
195
196 if ( $path =~ $skip_extensions_regex ) {
197 warn "$path [",-s $path,"] skipped compression\n";
198 file_copy( '<', $path, '>', $dest ) if ( $path ne $dest );
199 } elsif ( -s $path < $min_compress_size ) {
200 warn "$path [",-s $path,"] uncompressed, too small\n";
201 file_copy( '<', $path, '>', $dest ) if ( $path ne $dest );
202 } else {
203 warn "$path [",-s $path,"] compressing\n";
204
205 my $comp = $dest . '.gz';
206 file_copy( '<', $path, '>:gzip', $comp );
207
208 my ( $size_path, $size_comp ) = ( -s $path, -s $comp );
209
210 if ( $size_path <= $size_comp ) {
211 warn ">>> $size_path <= $size_comp leaving uncompressed $dest\n";
212 unlink $comp || confess "can't remove: $comp: $!";
213 file_copy( '<', $path, '>', $dest ) if ( $path ne $dest );
214 } else {
215 warn ">>> compressed $size_path -> $size_comp ",int(($size_comp * 100) / $size_path),"% $comp\n";
216
217 # FIXME add timeout to remove uncompressed version?
218 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: $!";
223 }
224 }
225
226 }
227 }
228
229 sub x_open {
230 my ($file) = shift;
231 my ($mode) = shift;
232
233 if ( $file eq '/.debug' ) {
234 my $path = $mount->{from} . '/.debug';
235 open( my $debug, '>', $path ) || die "can't open $path: $!";
236 my $dump = dump( $pending );
237 print $debug "pending = $dump\n";
238 close($debug);
239 $pending->{'/.debug'}->{path} = $path;
240 warn "## created dump $path $dump\n";
241 return 0;
242 }
243
244 my $mode_desc = {
245 rdonly => $mode && O_RDONLY,
246 rdwr => $mode && O_RDWR,
247 append => $mode && O_APPEND,
248 create => $mode && O_CREAT,
249 trunc => $mode && O_TRUNC,
250 };
251
252 my $path = tmp_path( $file );
253
254 warn "## open( $file, $mode ) pending: ", $pending->{$file}->{open}, " mode $mode: ", dump( $mode_desc )," $path [", -s $path, "]\n" if $debug;
255
256 my $fh;
257
258 if ( sysopen($fh , $path, $mode) ) {
259 close($fh) || confess "can't close $path: $!";
260 warn "<<< sysopen $path [", -e $path ? -s $path : 'new' , "]\n";
261 $pending->{$file}->{open}++;
262 return 0;
263 } else {
264 warn "ERROR: can't open $path -- $!";
265 return -$!;
266 }
267
268 }
269
270 sub x_read {
271 my ($file,$bufsize,$off) = @_;
272 my ($rv) = -ENOSYS();
273 my $path = fixup( $file );
274
275 confess "no pending file $file ", dump( $pending ) unless defined( $pending->{$file} );
276
277 return -ENOENT() unless -e $path;
278
279 my $fh = new IO::File;
280 return -ENOSYS() unless open($fh,$pending->{$file}->{path});
281
282 if(seek($fh,$off,SEEK_SET)) {
283 read($fh,$rv,$bufsize);
284 $pending->{$file}->{read} += length($rv) if $stats;
285 }
286
287 return $rv;
288 }
289
290 sub x_write {
291 my ($file,$buf,$off) = @_;
292
293 my $rv;
294 my $path = fixup($file);
295
296 confess "no pending file $file ", dump( $pending ) unless defined( $pending->{$file} );
297
298 return -ENOENT() unless -e $path;
299
300 $path = $pending->{$file}->{path} || confess "no path for $file in ", dump( $pending );
301 confess "write into non-existant $path for $file" unless -e $path;
302
303 my $fh = new IO::File;
304 return -ENOSYS() unless open($fh,'+<',$path);
305 if($rv = seek( $fh ,$off,SEEK_SET)) {
306 $rv = print( $fh $buf );
307 my $size = length($buf);
308 warn "## write $path offset $off [$size]\n" if $debug;
309 $pending->{$file}->{write} += $size;
310 }
311 $rv = -ENOSYS() unless $rv;
312 close($fh) || warn "can't close $path: $!";
313 return length($buf);
314 }
315
316 sub err { return (-shift || -$!) }
317
318 sub x_readlink { return readlink(fixup(shift)); }
319
320 sub x_unlink {
321 my $file = shift;
322 my $path = fixup( $file );
323
324 if ( $file =~ m#\Q/.fuse_hidden\E# ) {
325 return unlink $path ? 0 : -$1;
326 }
327
328 warn "# unlink( $file )\n";
329
330 unlink $path || return 0;
331
332 my $tmp = $mount->{tmp} . '/' . $file;
333 unlink $tmp if ( -e $tmp );
334
335 delete( $pending->{$file} );
336 return 0;
337 }
338
339 sub x_symlink {
340 my ($from,$to) = @_;
341
342 my $from_path = $from; #fixup( $from );
343 my $to_path = fixup( $to );
344
345 my $rv = symlink( $from_path, $to_path ) ? 0 : -$!;
346 warn "# symlink( $from_path -> $to_path ) = $rv\n" if $debug;
347
348 my $tmp = $mount->{tmp} . '/' . $from;
349 if ( -e $tmp ) {
350 my $tmp_to = $mount->{$tmp} . '/' . $to;
351 symlink( $tmp, $tmp_to ) || confess "can't symlink $tmp -> $tmp_to: $!";
352 }
353 return $rv;
354 }
355
356 sub x_link {
357 my ($from,$to) = @_;
358
359 my $from_path = fixup($from);
360 my $to_path = fixup($to);
361 $to_path .= '.gz' if ( $from_path =~ m/\.gz$/ && $to_path !~ m/\.gz$/ );
362
363 my $rv = link( $from_path, $to_path ) ? 0 : -$!;
364
365 warn "# link( $from_path -> $to_path ) = $rv\n" if $debug;
366
367 return $rv;
368 }
369
370 sub x_rename {
371 my ($old,$new) = @_;
372 my $old_path = fixup($old);
373 my $new_path = fixup($new);
374 $new_path .= '.gz' if ( $old_path =~ m/\.gz$/ && $new_path !~ m/\.gz$/ );
375
376 my $err = rename($old_path,$new_path) ? 0 : -ENOENT();
377 warn "## rename( $old_path => $new_path ) = $err\n";
378
379 my $tmp = $mount->{tmp} . '/' . $old;
380 if ( -e $tmp ) {
381 if ( $new =~ m#\Q/.fuse_hidden\E# ) {
382 unlink $tmp || confess "can't unlink $tmp for $new";
383 } else {
384 my $new_tmp = $mount->{tmp} . '/' . $new;
385 rename $tmp, $new_tmp || confess "can't rename $tmp -> $new_tmp : $!";
386 }
387 }
388
389 if (defined( $pending->{$old} )) {
390 $pending->{$new} = $pending->{$old};
391
392 my $path = $pending->{$old}->{path};
393 $path =~ s/\Q$old\E/$new/;
394 $pending->{$new}->{path} = $path;
395
396 delete( $pending->{$old} );
397 warn "## tweaking pending to ", dump( $pending ) if $debug;
398 }
399
400 return $err;
401 }
402
403 sub x_chown {
404 my ($file,$uid,$gid) = @_;
405 my $path = fixup($file);
406 print "nonexistent $path\n" unless -e $path;
407 # perl's chown() does not chown symlinks, it chowns the symlink's
408 # target. it fails when the link's target doesn't exist, because
409 # the stat64() syscall fails.
410 # this causes error messages when unpacking symlinks in tarballs.
411 my ($err) = syscall(&SYS_lchown,$path,$uid,$gid,$path) ? -$! : 0;
412
413 my $tmp = $mount->{tmp} . '/' . $file;
414 syscall(&SYS_lchown,$file,$uid,$gid,$path) if -e $tmp;
415
416 return $err;
417 }
418
419 sub x_chmod {
420 my ($path) = fixup(shift);
421 my ($mode) = shift;
422 my ($err) = chmod($mode,$path) ? 0 : -$!;
423 return $err;
424 }
425
426 sub x_truncate {
427 my ( $file,$size ) = @_;
428
429 #confess "no pending file $file to truncate in ", dump( $pending ) unless defined( $pending->{$file} );
430
431 my $path = tmp_path( $file );
432 my $rv = truncate( $path, $size ) ? 0 : -$! ;
433 warn "## truncate( $file $size ) $path [", -s $path, "] = $rv\n" if $debug;
434 compress_file2path( $file, $path );
435
436 return $rv;
437 }
438
439 sub x_utime { return utime($_[1],$_[2],fixup($_[0])) ? 0:-$!; }
440
441 sub x_mkdir { my ($name, $perm) = @_; return 0 if mkdir(fixup($name),$perm); return -$!; }
442 sub x_rmdir { return 0 if rmdir fixup(shift); return -$!; }
443
444 sub x_mknod {
445 # since this is called for ALL files, not just devices, I'll do some checks
446 # and possibly run the real mknod command.
447 my ($file, $modes, $dev) = @_;
448 $file = fixup($file);
449 $! = 0;
450 syscall(&SYS_mknod,$file,$modes,$dev);
451 return -$!;
452 }
453
454 sub x_release {
455 my ( $file, $mode ) = @_;
456
457 if ( ! defined( $pending->{$file} ) ) {
458 warn "release $file, NO PENDING DATA\n";
459 return 0;
460 } elsif ( ! defined( $pending->{$file}->{write} ) ) {
461 warn "release $file, not written into\n";
462 } elsif ( $file =~ m#\Q/.fuse_hidden\E# ) {
463 warn "release internal $file\n" if $debug;
464 } else {
465 compress_file2path( $file );
466 }
467
468 $pending->{$file}->{open}--;
469 if ( $pending->{$file}->{open} == 0 ) {
470 warn "## cleanup pending $file [", -s fixup($file), "]\n" if $debug;
471 delete( $pending->{$file} );
472 }
473
474 return 0;
475 }
476
477 # kludge
478 sub x_statfs {return 255,1000000,500000,1000000,500000,4096}
479 Fuse::main(
480 mountpoint=>$mount->{to},
481 getattr =>"main::x_getattr",
482 readlink=>"main::x_readlink",
483 getdir =>"main::x_getdir",
484 mknod =>"main::x_mknod",
485 mkdir =>"main::x_mkdir",
486 unlink =>"main::x_unlink",
487 rmdir =>"main::x_rmdir",
488 symlink =>"main::x_symlink",
489 rename =>"main::x_rename",
490 link =>"main::x_link",
491 chmod =>"main::x_chmod",
492 chown =>"main::x_chown",
493 truncate=>"main::x_truncate",
494 utime =>"main::x_utime",
495 open =>"main::x_open",
496 read =>"main::x_read",
497 write =>"main::x_write",
498 statfs =>"main::x_statfs",
499 release =>"main::x_release",
500 # threaded=>1,
501 debug => $fuse_debug,
502 );

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