/[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 27 - (show annotations)
Tue Jul 10 00:22:00 2007 UTC (12 years, 2 months ago) by dpavlin
File MIME type: text/plain
File size: 11709 byte(s)
* symlink and link support with tests
* truncate now works with tmp
* logging cleanup
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
20 GetOptions(
21 'debug+' => \$debug,
22 'fuse-debug+' => \$fuse_debug,
23 );
24
25 my $mount = {
26 from => '/tmp/comp',
27 to => '/tmp/no-comp',
28 tmp => '/dev/shm/comp',
29 };
30
31 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
33 # don't compress files smaller than this
34 my $min_compress_size = 512;
35
36 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 sub real_name {
46 my ( $dir, $name ) = @_;
47 if ( -e "$dir/${name}.gz" ) {
48 return "${name}.gz";
49 }
50 return $name;
51 }
52
53 sub fixup {
54 my ( $path ) = @_;
55 return $mount->{from} . '/' . real_name( $mount->{from}, $path );
56 }
57
58 sub original_name {
59 my $p = shift;
60 $p =~ s/\.gz$//;
61 return $p;
62 };
63
64 sub gzip_original_size {
65 my $file = shift;
66
67 return unless -e $file;
68
69 my $buff;
70
71 open(my $fh, $file) || die "can't open $file: $!";
72
73 # read($fh, $buff, 10 );
74 # print dump( unpack("nccVcc", $buff ) );
75
76 seek($fh, -4, 2);
77 read($fh, $buff, 4 );
78 close($fh);
79
80 return unpack("L", $buff);
81 }
82
83 sub x_getattr {
84 my ($file) = fixup(shift);
85 my (@list) = lstat($file);
86 $list[7] = gzip_original_size( $file ) if ( $list[7] && $file =~ m/\.gz$/ );
87 return -$! unless @list;
88 return @list;
89 }
90
91 sub x_getdir {
92 my ($dirname) = fixup(shift);
93 unless(opendir(DIRHANDLE,$dirname)) {
94 return -ENOENT();
95 }
96 my @files = map { original_name( $_ ) } readdir(DIRHANDLE);
97 closedir(DIRHANDLE);
98 return (@files, 0);
99 }
100
101 sub file_copy {
102 my ( $s_opt, $s_path, $d_opt, $d_path ) = @_;
103 warn "## file_copy( $s_opt $s_path [",-s $s_path,"] $d_opt $d_path [",-e $d_path ? -s $d_path : 'new',"])\n" if $debug;
104 open(my $s, $s_opt, $s_path ) || confess "can't open $s_path: $!\npending = ", dump( $pending );
105 open(my $d, $d_opt, $d_path ) || confess "can't open $d_path: $!";
106 my $buff;
107 while( read( $s, $buff, 65535 ) ) {
108 print $d $buff || confess "can't write into $d_path: $!";
109 warn ">> [", length($buff), "] offset ", tell($s), " -> ", tell($d), "\n" if $debug;
110 }
111 close($d) || warn "can't close $d_path: $!";
112 close($s) || warn "can't close $s_path: $!";
113 warn "-- $s_path [", -s $s_path, "] >>> $d_path [", -s $d_path, "]\n" if $debug;
114 my ($mode,$uid,$gid,$atime,$mtime) = (stat $s_path)[2,4,5,8,9];
115
116 chmod $mode, $d_path || warn "chmod( $mode $d_path ) failed: $!\n";
117 chown $uid,$gid,$d_path || warn "chown( $uid $gid $d_path ) failed: $!\n";
118 utime $atime,$mtime,$d_path || warn "utime( $atime $mtime $d_path ) failed: $!\n";
119
120 undef $d;
121 undef $s;
122 }
123
124 sub x_open {
125 my ($file) = shift;
126 my ($mode) = shift;
127
128 if ( $file eq '/.debug' ) {
129 my $path = $mount->{from} . '/.debug';
130 open( my $debug, '>', $path ) || die "can't open $path: $!";
131 my $dump = dump( $pending );
132 print $debug "pending = $dump\n";
133 close($debug);
134 $pending->{'/.debug'}->{path} = $path;
135 warn "## created dump $path $dump\n";
136 return 0;
137 }
138
139 $pending->{$file}->{open}++;
140
141 my $mode_desc = {
142 rdonly => $mode && O_RDONLY,
143 rdwr => $mode && O_RDWR,
144 append => $mode && O_APPEND,
145 create => $mode && O_CREAT,
146 trunc => $mode && O_TRUNC,
147 };
148 my $path = fixup($file);
149 warn "## open( $file, $mode ) pending: ", $pending->{$file}->{open}, " mode $mode: ", dump( $mode_desc )," $path [", -s $path, "]\n" if $debug;
150 my $fh;
151
152 my $tmp = $mount->{tmp} . '/' . $file;
153 if ( -e $tmp ) {
154 $path = $tmp;
155 } elsif ( $path =~ m/\.gz$/ ) {
156 my $dest_path = $tmp;
157 $dest_path =~ s!/[^/]+$!!; #!vim-fix
158 mkpath $dest_path unless -e $dest_path;
159 if ( -s $path ) {
160 file_copy( '<:gzip', $path, '>', $tmp )
161 } else {
162 warn "ERROR: filesystem corruption, $path is zero size\n";
163 }
164 $path = $tmp;
165 }
166
167 if ( sysopen($fh , $path, $mode) ) {
168 close($fh) || confess "can't close $path: $!";
169 warn "<<< open $path [", -e $path ? -s $path : 'new' , "]\n";
170 $pending->{$file}->{path} = $path;
171 return 0;
172 } else {
173 warn "ERROR: can't open $path -- $!";
174 return -$!;
175 }
176
177 }
178
179 sub x_read {
180 my ($file,$bufsize,$off) = @_;
181 my ($rv) = -ENOSYS();
182 my $path = fixup( $file );
183
184 confess "no pending file $file ", dump( $pending ) unless defined( $pending->{$file} );
185
186 return -ENOENT() unless -e $path;
187
188 my $fh = new IO::File;
189 return -ENOSYS() unless open($fh,$pending->{$file}->{path});
190
191 if(seek($fh,$off,SEEK_SET)) {
192 read($fh,$rv,$bufsize);
193 }
194
195 return $rv;
196 }
197
198 sub x_write {
199 my ($file,$buf,$off) = @_;
200
201 my $rv;
202 my $path = fixup($file);
203
204 confess "no pending file $file ", dump( $pending ) unless defined( $pending->{$file} );
205
206 return -ENOENT() unless -e $path;
207
208 $path = $pending->{$file}->{path} || confess "no path for $file in ", dump( $pending );
209 confess "write into non-existant $path for $file: $!" unless -e $path;
210
211 my $fh = new IO::File;
212 return -ENOSYS() unless open($fh,'+<',$path);
213 if($rv = seek( $fh ,$off,SEEK_SET)) {
214 $rv = print( $fh $buf );
215 warn "## write $path offset $off [",length( $buf ), "]\n" if $debug;
216 $pending->{$file}->{write}++;
217 }
218 $rv = -ENOSYS() unless $rv;
219 close($fh) || warn "can't close $path: $!";
220 return length($buf);
221 }
222
223 sub err { return (-shift || -$!) }
224
225 sub x_readlink { return readlink(fixup(shift)); }
226
227 sub x_unlink {
228 my $file = shift;
229 my $path = fixup( $file );
230
231 if ( $file =~ m#\Q/.fuse_hidden\E# ) {
232 return unlink $path ? 0 : -$1;
233 }
234
235 warn "# unlink( $file )\n";
236
237 unlink $path || return 0;
238
239 my $tmp = $mount->{tmp} . '/' . $file;
240 unlink $tmp if ( -e $tmp );
241
242 delete( $pending->{$file} );
243 return 0;
244 }
245
246 sub x_symlink {
247 my ($from,$to) = @_;
248
249 my $from_path = $from; #fixup( $from );
250 my $to_path = fixup( $to );
251
252 my $rv = symlink( $from_path, $to_path ) ? 0 : -$!;
253 warn "# symlink( $from_path -> $to_path ) = $rv\n" if $debug;
254
255 my $tmp = $mount->{tmp} . '/' . $from;
256 if ( -e $tmp ) {
257 my $tmp_to = $mount->{$tmp} . '/' . $to;
258 symlink( $tmp, $tmp_to ) || confess "can't symlink $tmp -> $tmp_to: $!";
259 }
260 return $rv;
261 }
262
263 sub x_link {
264 my ($from,$to) = @_;
265
266 my $from_path = fixup($from);
267 my $to_path = fixup($to);
268 $to_path .= '.gz' if ( $from_path =~ m/\.gz$/ && $to_path !~ m/\.gz$/ );
269
270 my $rv = link( $from_path, $to_path ) ? 0 : -$!;
271
272 warn "# link( $from_path -> $to_path ) = $rv\n" if $debug;
273
274 return $rv;
275 }
276
277 sub x_rename {
278 my ($old,$new) = @_;
279 my $old_path = fixup($old);
280 my $new_path = fixup($new);
281 $new_path .= '.gz' if ( $old_path =~ m/\.gz$/ && $new_path !~ m/\.gz$/ );
282
283 my $err = rename($old_path,$new_path) ? 0 : -ENOENT();
284 warn "## rename( $old_path => $new_path ) = $err\n";
285
286 my $tmp = $mount->{tmp} . '/' . $old;
287 if ( -e $tmp ) {
288 if ( $new =~ m#\Q/.fuse_hidden\E# ) {
289 unlink $tmp || confess "can't unlink $tmp for $new\n";
290 } else {
291 my $new_tmp = $mount->{tmp} . '/' . $new;
292 rename $tmp, $new_tmp || confess "can't rename $tmp -> $new_tmp : $!";
293 }
294 }
295
296 if (defined( $pending->{$old} )) {
297 $pending->{$new} = $pending->{$old};
298
299 my $path = $pending->{$old}->{path};
300 $path =~ s/\Q$old\E/$new/;
301 $pending->{$new}->{path} = $path;
302
303 delete( $pending->{$old} );
304 warn "## tweaking pending to ", dump( $pending ) if $debug;
305 }
306
307 return $err;
308 }
309
310 sub x_chown {
311 my ($file,$uid,$gid) = @_;
312 my $path = fixup($file);
313 print "nonexistent $path\n" unless -e $path;
314 # perl's chown() does not chown symlinks, it chowns the symlink's
315 # target. it fails when the link's target doesn't exist, because
316 # the stat64() syscall fails.
317 # this causes error messages when unpacking symlinks in tarballs.
318 my ($err) = syscall(&SYS_lchown,$path,$uid,$gid,$path) ? -$! : 0;
319
320 my $tmp = $mount->{tmp} . '/' . $file;
321 syscall(&SYS_lchown,$file,$uid,$gid,$path) if -e $tmp;
322
323 return $err;
324 }
325
326 sub x_chmod {
327 my ($path) = fixup(shift);
328 my ($mode) = shift;
329 my ($err) = chmod($mode,$path) ? 0 : -$!;
330 return $err;
331 }
332
333 sub x_truncate {
334 my ( $file,$size ) = @_;
335 my $path = fixup($file);
336 my $rv = truncate( $path, $size ) ? 0 : -$! ;
337 if ( $path =~ m/\.gz$/ ) {
338 my $no_gz = $path;
339 $no_gz =~ s/\.gz$//;
340 rename $path, $no_gz || confess "can't rename $path -> $no_gz: $!";
341 }
342 warn "## truncate( $file $size ) $path [", -s $path, "] = $rv\n" if $debug;
343 $pending->{$file}->{write}++;
344
345 my $tmp = $mount->{tmp} . '/' . $file;
346 truncate( $tmp, $size ) if -e $tmp;
347
348 return $rv;
349 }
350 sub x_utime { return utime($_[1],$_[2],fixup($_[0])) ? 0:-$!; }
351
352 sub x_mkdir { my ($name, $perm) = @_; return 0 if mkdir(fixup($name),$perm); return -$!; }
353 sub x_rmdir { return 0 if rmdir fixup(shift); return -$!; }
354
355 sub x_mknod {
356 # since this is called for ALL files, not just devices, I'll do some checks
357 # and possibly run the real mknod command.
358 my ($file, $modes, $dev) = @_;
359 $file = fixup($file);
360 $! = 0;
361 syscall(&SYS_mknod,$file,$modes,$dev);
362 return -$!;
363 }
364
365 sub x_release {
366 my ( $file, $mode ) = @_;
367
368 if ( $file =~ m#\Q/.fuse_hidden\E# ) {
369 warn "release internal $file\n" if $debug;
370 delete( $pending->{$file} );
371 return 0;
372 }
373
374 if ( ! defined( $pending->{$file} ) ) {
375 warn "release $file, NO PENDING DATA\n";
376 return 0;
377 } elsif ( ! defined( $pending->{$file}->{write} ) ) {
378 warn "release $file, not written into\n";
379 } elsif ( defined( $pending->{$file}->{open} ) && $pending->{$file}->{open} == 1 ) {
380 my $path = $pending->{$file}->{path} || confess "no path for $file ? ", dump( $pending );
381 my $dest = fixup( $file );
382
383 # cleanup old compressed copy
384 if ( $dest =~ /\.gz$/ ) {
385 warn "## remove old $dest\n";
386 unlink $dest || confess "can't remove $dest: $!";
387 $dest =~ s/\.gz$//;
388 }
389
390 if ( $file =~ $skip_extensions_regex ) {
391 warn "release $path [",-s $path,"] skipped compression\n";
392 file_copy( '<', $path, '>', $dest ) if ( $path ne $dest );
393 } elsif ( -s $path < $min_compress_size ) {
394 warn "release $path [",-s $path,"] uncompressed, too small\n";
395 file_copy( '<', $path, '>', $dest ) if ( $path ne $dest );
396 } else {
397 warn "release $path [",-s $path,"] compressing\n";
398
399 my $comp = $dest . '.gz';
400 file_copy( '<', $path, '>:gzip', $comp );
401
402 my ( $size_path, $size_comp ) = ( -s $path, -s $comp );
403
404 if ( $size_path <= $size_comp ) {
405 warn ">>> $size_path <= $size_comp leaving uncompressed\n";
406 unlink $comp || confess "can't remove: $comp: $!";
407 } else {
408 warn ">>> compressed $size_path -> $size_comp ",int(($size_comp * 100) / $size_path),"%\n";
409 # FIXME add timeout to remove uncompressed version?
410 unlink $path || confess "can't remove $path: $!";
411 }
412 }
413 } else {
414 warn "release $file, but still used ", $pending->{$file}->{open} , " times, delaying compression\n";
415 }
416 $pending->{$file}->{open}--;
417 if ( $pending->{$file}->{open} == 0 ) {
418 warn "## cleanup pending $file [", -s fixup($file), "]\n" if $debug;
419 delete( $pending->{$file} );
420 }
421 return 0;
422 }
423
424 # kludge
425 sub x_statfs {return 255,1000000,500000,1000000,500000,4096}
426 Fuse::main(
427 mountpoint=>$mount->{to},
428 getattr =>"main::x_getattr",
429 readlink=>"main::x_readlink",
430 getdir =>"main::x_getdir",
431 mknod =>"main::x_mknod",
432 mkdir =>"main::x_mkdir",
433 unlink =>"main::x_unlink",
434 rmdir =>"main::x_rmdir",
435 symlink =>"main::x_symlink",
436 rename =>"main::x_rename",
437 link =>"main::x_link",
438 chmod =>"main::x_chmod",
439 chown =>"main::x_chown",
440 truncate=>"main::x_truncate",
441 utime =>"main::x_utime",
442 open =>"main::x_open",
443 read =>"main::x_read",
444 write =>"main::x_write",
445 statfs =>"main::x_statfs",
446 release =>"main::x_release",
447 # threaded=>1,
448 debug => $fuse_debug,
449 );

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