/[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 30 - (show annotations)
Tue Jul 10 10:48:21 2007 UTC (12 years, 2 months ago) by dpavlin
File MIME type: text/plain
File size: 12877 byte(s)
cleanup uncompressed version after compression
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 $skip_extensions_regex = qr/\.(?:sw[a-z]|gif|png|jpeg|jpg|avi|rar|zip|bz2|gz|tgz|avi|mpeg|mpg|tmp|temp)$/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 return $name;
54 }
55
56 sub fixup {
57 my ( $path ) = @_;
58 return $mount->{from} . '/' . real_name( $mount->{from}, $path );
59 }
60
61 sub original_name {
62 my $p = shift;
63 $p =~ s/\.gz$//;
64 return $p;
65 };
66
67 sub gzip_original_size {
68 my $file = shift;
69
70 return unless -e $file;
71
72 my $buff;
73
74 open(my $fh, $file) || die "can't open $file: $!";
75
76 # read($fh, $buff, 10 );
77 # print dump( unpack("nccVcc", $buff ) );
78
79 seek($fh, -4, 2);
80 read($fh, $buff, 4 );
81 close($fh);
82
83 return unpack("L", $buff);
84 }
85
86 sub x_getattr {
87 my ($file) = fixup(shift);
88 my (@list) = lstat($file);
89 $list[7] = gzip_original_size( $file ) if ( $list[7] && $file =~ m/\.gz$/ );
90 return -$! unless @list;
91 return @list;
92 }
93
94 sub x_getdir {
95 my ($dirname) = fixup(shift);
96 unless(opendir(DIRHANDLE,$dirname)) {
97 return -ENOENT();
98 }
99 my @files = map { original_name( $_ ) } readdir(DIRHANDLE);
100 closedir(DIRHANDLE);
101 return (@files, 0);
102 }
103
104 sub file_copy {
105 my ( $s_opt, $s_path, $d_opt, $d_path ) = @_;
106 warn "## file_copy( $s_opt $s_path [",-s $s_path,"] $d_opt $d_path [",-e $d_path ? -s $d_path : 'new',"])\n" if $debug;
107 open(my $s, $s_opt, $s_path ) || confess "can't open $s_path: $!\npending = ", dump( $pending );
108 open(my $d, $d_opt, $d_path ) || confess "can't open $d_path: $!";
109 my $buff;
110 while( read( $s, $buff, 65535 ) ) {
111 print $d $buff || confess "can't write into $d_path: $!";
112 warn ">> [", length($buff), "] offset ", tell($s), " -> ", tell($d), "\n" if $debug;
113 }
114 close($d) || warn "can't close $d_path: $!";
115 close($s) || warn "can't close $s_path: $!";
116 warn "-- $s_path [", -s $s_path, "] >>> $d_path [", -s $d_path, "]\n" if $debug;
117 my ($mode,$uid,$gid,$atime,$mtime) = (stat $s_path)[2,4,5,8,9];
118
119 chmod $mode, $d_path || warn "chmod( $mode $d_path ) failed: $!\n";
120 chown $uid,$gid,$d_path || warn "chown( $uid $gid $d_path ) failed: $!\n";
121 utime $atime,$mtime,$d_path || warn "utime( $atime $mtime $d_path ) failed: $!\n";
122
123 undef $d;
124 undef $s;
125 }
126
127 sub tmp_path {
128 my $file = shift;
129
130 my $path = fixup( $file );
131
132 my $op = 'UNKNOWN';
133
134 if (defined( $pending->{$file} )) {
135 $path = $pending->{$file}->{path} || confess "no path for $file in ",dump( $pending );
136 $op = 'opened';
137 } else {
138 my $tmp = $mount->{tmp} . '/' . $file;
139 if ( -e $tmp ) {
140 $path = $tmp;
141 $op = 'existing';
142 } elsif ( $path =~ m/\.gz$/ ) {
143 my $dest_path = $tmp;
144 $dest_path =~ s!/[^/]+$!!; #!vim-fix
145 mkpath $dest_path unless -e $dest_path;
146 if ( -s $path ) {
147 file_copy( '<:gzip', $path, '>', $tmp )
148 } else {
149 confess "ASSERT: filesystem corruption, $path is zero size\n";
150 }
151 $path = $tmp;
152 $op = 'created';
153 }
154 confess "ASSERT: path shouldn't exist for $file in ", dump( $pending ) if defined( $pending->{$file}->{path} );
155 confess "ASSERT: open shouldn't exist for $file in ", dump( $pending ) if defined( $pending->{$file}->{open} );
156 $pending->{$file}->{path} = $path;
157 $pending->{$file}->{open} = 0; # not really opened, just uncompressed
158 warn "## tmp_file( $file ) $op $path [", -s $path, "]\n";
159 }
160 return $path;
161 }
162
163 sub compress_file2path {
164 my ( $file, $path ) = @_;
165
166 my $dest = fixup( $file );
167
168 if ( defined($pending->{$file}) ) {
169 my $pending_path = $pending->{$file}->{path} || confess "no path for $file in ",dump( $pending );
170
171 if ( $pending->{$file}->{open} > 1 ) {
172 warn "$file used ", $pending->{$file}->{open}, " times, delaying compression\n";
173 return;
174 } elsif ( ! $path ) {
175 $path = $pending_path;
176 } elsif ( $pending_path ne $path ) {
177 confess "ASSERT: compressing into $path instead of $pending_path\n";
178 }
179 }
180
181 confess "need path" unless $path;
182
183 # cleanup old compressed copy
184 if ( $dest =~ /\.gz$/ ) {
185 warn "## remove old $dest\n";
186 unlink $dest || confess "can't remove $dest: $!";
187 $dest =~ s/\.gz$//;
188 confess "ASSERT: uncompressed $dest shouldn't exist!" if -e $dest;
189 }
190
191 if ( $path =~ $skip_extensions_regex ) {
192 warn "$path [",-s $path,"] skipped compression\n";
193 file_copy( '<', $path, '>', $dest ) if ( $path ne $dest );
194 } elsif ( -s $path < $min_compress_size ) {
195 warn "$path [",-s $path,"] uncompressed, too small\n";
196 file_copy( '<', $path, '>', $dest ) if ( $path ne $dest );
197 } else {
198 warn "$path [",-s $path,"] compressing\n";
199
200 my $comp = $dest . '.gz';
201 file_copy( '<', $path, '>:gzip', $comp );
202
203 my ( $size_path, $size_comp ) = ( -s $path, -s $comp );
204
205 if ( $size_path <= $size_comp ) {
206 warn ">>> $size_path <= $size_comp leaving uncompressed\n";
207 unlink $comp || confess "can't remove: $comp: $!";
208 } else {
209 warn ">>> compressed $size_path -> $size_comp ",int(($size_comp * 100) / $size_path),"% $comp\n";
210
211 # FIXME add timeout to remove uncompressed version?
212 unlink $path || confess "can't remove $path: $!";
213
214 if ( -e $dest ) {
215 warn "## cleanup uncompressed $dest\n" if $debug;
216 unlink $dest || confess "can't remove $dest: $!";
217 }
218 }
219
220 }
221 }
222
223 sub x_open {
224 my ($file) = shift;
225 my ($mode) = shift;
226
227 if ( $file eq '/.debug' ) {
228 my $path = $mount->{from} . '/.debug';
229 open( my $debug, '>', $path ) || die "can't open $path: $!";
230 my $dump = dump( $pending );
231 print $debug "pending = $dump\n";
232 close($debug);
233 $pending->{'/.debug'}->{path} = $path;
234 warn "## created dump $path $dump\n";
235 return 0;
236 }
237
238 my $mode_desc = {
239 rdonly => $mode && O_RDONLY,
240 rdwr => $mode && O_RDWR,
241 append => $mode && O_APPEND,
242 create => $mode && O_CREAT,
243 trunc => $mode && O_TRUNC,
244 };
245
246 my $path = tmp_path( $file );
247
248 warn "## open( $file, $mode ) pending: ", $pending->{$file}->{open}, " mode $mode: ", dump( $mode_desc )," $path [", -s $path, "]\n" if $debug;
249
250 my $fh;
251
252 if ( sysopen($fh , $path, $mode) ) {
253 close($fh) || confess "can't close $path: $!";
254 warn "<<< sysopen $path [", -e $path ? -s $path : 'new' , "]\n";
255 $pending->{$file}->{open}++;
256 return 0;
257 } else {
258 warn "ERROR: can't open $path -- $!";
259 return -$!;
260 }
261
262 }
263
264 sub x_read {
265 my ($file,$bufsize,$off) = @_;
266 my ($rv) = -ENOSYS();
267 my $path = fixup( $file );
268
269 confess "no pending file $file ", dump( $pending ) unless defined( $pending->{$file} );
270
271 return -ENOENT() unless -e $path;
272
273 my $fh = new IO::File;
274 return -ENOSYS() unless open($fh,$pending->{$file}->{path});
275
276 if(seek($fh,$off,SEEK_SET)) {
277 read($fh,$rv,$bufsize);
278 $pending->{$file}->{read} += length($rv) if $stats;
279 }
280
281 return $rv;
282 }
283
284 sub x_write {
285 my ($file,$buf,$off) = @_;
286
287 my $rv;
288 my $path = fixup($file);
289
290 confess "no pending file $file ", dump( $pending ) unless defined( $pending->{$file} );
291
292 return -ENOENT() unless -e $path;
293
294 $path = $pending->{$file}->{path} || confess "no path for $file in ", dump( $pending );
295 confess "write into non-existant $path for $file" unless -e $path;
296
297 my $fh = new IO::File;
298 return -ENOSYS() unless open($fh,'+<',$path);
299 if($rv = seek( $fh ,$off,SEEK_SET)) {
300 $rv = print( $fh $buf );
301 my $size = length($buf);
302 warn "## write $path offset $off [$size]\n" if $debug;
303 $pending->{$file}->{write} += $size;
304 }
305 $rv = -ENOSYS() unless $rv;
306 close($fh) || warn "can't close $path: $!";
307 return length($buf);
308 }
309
310 sub err { return (-shift || -$!) }
311
312 sub x_readlink { return readlink(fixup(shift)); }
313
314 sub x_unlink {
315 my $file = shift;
316 my $path = fixup( $file );
317
318 if ( $file =~ m#\Q/.fuse_hidden\E# ) {
319 return unlink $path ? 0 : -$1;
320 }
321
322 warn "# unlink( $file )\n";
323
324 unlink $path || return 0;
325
326 my $tmp = $mount->{tmp} . '/' . $file;
327 unlink $tmp if ( -e $tmp );
328
329 delete( $pending->{$file} );
330 return 0;
331 }
332
333 sub x_symlink {
334 my ($from,$to) = @_;
335
336 my $from_path = $from; #fixup( $from );
337 my $to_path = fixup( $to );
338
339 my $rv = symlink( $from_path, $to_path ) ? 0 : -$!;
340 warn "# symlink( $from_path -> $to_path ) = $rv\n" if $debug;
341
342 my $tmp = $mount->{tmp} . '/' . $from;
343 if ( -e $tmp ) {
344 my $tmp_to = $mount->{$tmp} . '/' . $to;
345 symlink( $tmp, $tmp_to ) || confess "can't symlink $tmp -> $tmp_to: $!";
346 }
347 return $rv;
348 }
349
350 sub x_link {
351 my ($from,$to) = @_;
352
353 my $from_path = fixup($from);
354 my $to_path = fixup($to);
355 $to_path .= '.gz' if ( $from_path =~ m/\.gz$/ && $to_path !~ m/\.gz$/ );
356
357 my $rv = link( $from_path, $to_path ) ? 0 : -$!;
358
359 warn "# link( $from_path -> $to_path ) = $rv\n" if $debug;
360
361 return $rv;
362 }
363
364 sub x_rename {
365 my ($old,$new) = @_;
366 my $old_path = fixup($old);
367 my $new_path = fixup($new);
368 $new_path .= '.gz' if ( $old_path =~ m/\.gz$/ && $new_path !~ m/\.gz$/ );
369
370 my $err = rename($old_path,$new_path) ? 0 : -ENOENT();
371 warn "## rename( $old_path => $new_path ) = $err\n";
372
373 my $tmp = $mount->{tmp} . '/' . $old;
374 if ( -e $tmp ) {
375 if ( $new =~ m#\Q/.fuse_hidden\E# ) {
376 unlink $tmp || confess "can't unlink $tmp for $new\n";
377 } else {
378 my $new_tmp = $mount->{tmp} . '/' . $new;
379 rename $tmp, $new_tmp || confess "can't rename $tmp -> $new_tmp : $!";
380 }
381 }
382
383 if (defined( $pending->{$old} )) {
384 $pending->{$new} = $pending->{$old};
385
386 my $path = $pending->{$old}->{path};
387 $path =~ s/\Q$old\E/$new/;
388 $pending->{$new}->{path} = $path;
389
390 delete( $pending->{$old} );
391 warn "## tweaking pending to ", dump( $pending ) if $debug;
392 }
393
394 return $err;
395 }
396
397 sub x_chown {
398 my ($file,$uid,$gid) = @_;
399 my $path = fixup($file);
400 print "nonexistent $path\n" unless -e $path;
401 # perl's chown() does not chown symlinks, it chowns the symlink's
402 # target. it fails when the link's target doesn't exist, because
403 # the stat64() syscall fails.
404 # this causes error messages when unpacking symlinks in tarballs.
405 my ($err) = syscall(&SYS_lchown,$path,$uid,$gid,$path) ? -$! : 0;
406
407 my $tmp = $mount->{tmp} . '/' . $file;
408 syscall(&SYS_lchown,$file,$uid,$gid,$path) if -e $tmp;
409
410 return $err;
411 }
412
413 sub x_chmod {
414 my ($path) = fixup(shift);
415 my ($mode) = shift;
416 my ($err) = chmod($mode,$path) ? 0 : -$!;
417 return $err;
418 }
419
420 sub x_truncate {
421 my ( $file,$size ) = @_;
422
423 #confess "no pending file $file to truncate in ", dump( $pending ) unless defined( $pending->{$file} );
424
425 my $path = tmp_path( $file );
426 my $rv = truncate( $path, $size ) ? 0 : -$! ;
427 warn "## truncate( $file $size ) $path [", -s $path, "] = $rv\n" if $debug;
428 compress_file2path( $file, $path );
429
430 return $rv;
431 }
432
433 sub x_utime { return utime($_[1],$_[2],fixup($_[0])) ? 0:-$!; }
434
435 sub x_mkdir { my ($name, $perm) = @_; return 0 if mkdir(fixup($name),$perm); return -$!; }
436 sub x_rmdir { return 0 if rmdir fixup(shift); return -$!; }
437
438 sub x_mknod {
439 # since this is called for ALL files, not just devices, I'll do some checks
440 # and possibly run the real mknod command.
441 my ($file, $modes, $dev) = @_;
442 $file = fixup($file);
443 $! = 0;
444 syscall(&SYS_mknod,$file,$modes,$dev);
445 return -$!;
446 }
447
448 sub x_release {
449 my ( $file, $mode ) = @_;
450
451 if ( ! defined( $pending->{$file} ) ) {
452 warn "release $file, NO PENDING DATA\n";
453 return 0;
454 } elsif ( ! defined( $pending->{$file}->{write} ) ) {
455 warn "release $file, not written into\n";
456 } elsif ( $file =~ m#\Q/.fuse_hidden\E# ) {
457 warn "release internal $file\n" if $debug;
458 } else {
459 compress_file2path( $file );
460 }
461
462 $pending->{$file}->{open}--;
463 if ( $pending->{$file}->{open} == 0 ) {
464 warn "## cleanup pending $file [", -s fixup($file), "]\n" if $debug;
465 delete( $pending->{$file} );
466 }
467
468 return 0;
469 }
470
471 # kludge
472 sub x_statfs {return 255,1000000,500000,1000000,500000,4096}
473 Fuse::main(
474 mountpoint=>$mount->{to},
475 getattr =>"main::x_getattr",
476 readlink=>"main::x_readlink",
477 getdir =>"main::x_getdir",
478 mknod =>"main::x_mknod",
479 mkdir =>"main::x_mkdir",
480 unlink =>"main::x_unlink",
481 rmdir =>"main::x_rmdir",
482 symlink =>"main::x_symlink",
483 rename =>"main::x_rename",
484 link =>"main::x_link",
485 chmod =>"main::x_chmod",
486 chown =>"main::x_chown",
487 truncate=>"main::x_truncate",
488 utime =>"main::x_utime",
489 open =>"main::x_open",
490 read =>"main::x_read",
491 write =>"main::x_write",
492 statfs =>"main::x_statfs",
493 release =>"main::x_release",
494 # threaded=>1,
495 debug => $fuse_debug,
496 );

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