/[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 27 - (hide annotations)
Tue Jul 10 00:22:00 2007 UTC (12 years, 4 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 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/${name}.gz" ) {
48     return "${name}.gz";
49     }
50     return $name;
51     }
52    
53 dpavlin 1 sub fixup {
54     my ( $path ) = @_;
55 dpavlin 27 return $mount->{from} . '/' . real_name( $mount->{from}, $path );
56 dpavlin 1 }
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 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;
104 dpavlin 5 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 dpavlin 1 my $buff;
107     while( read( $s, $buff, 65535 ) ) {
108 dpavlin 5 print $d $buff || confess "can't write into $d_path: $!";
109 dpavlin 13 warn ">> [", length($buff), "] offset ", tell($s), " -> ", tell($d), "\n" if $debug;
110 dpavlin 1 }
111     close($d) || warn "can't close $d_path: $!";
112     close($s) || warn "can't close $s_path: $!";
113 dpavlin 5 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 dpavlin 8
120     undef $d;
121     undef $s;
122 dpavlin 1 }
123    
124     sub x_open {
125     my ($file) = shift;
126     my ($mode) = shift;
127 dpavlin 12
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 dpavlin 1 $pending->{$file}->{open}++;
140 dpavlin 8
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 dpavlin 14 trunc => $mode && O_TRUNC,
147 dpavlin 8 };
148 dpavlin 14 my $path = fixup($file);
149 dpavlin 19 warn "## open( $file, $mode ) pending: ", $pending->{$file}->{open}, " mode $mode: ", dump( $mode_desc )," $path [", -s $path, "]\n" if $debug;
150 dpavlin 1 my $fh;
151 dpavlin 8
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 dpavlin 23 if ( -s $path ) {
160     file_copy( '<:gzip', $path, '>', $tmp )
161     } else {
162     warn "ERROR: filesystem corruption, $path is zero size\n";
163     }
164 dpavlin 8 $path = $tmp;
165     }
166    
167 dpavlin 21 if ( sysopen($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 dpavlin 26 warn "ERROR: can't open $path -- $!";
174 dpavlin 21 return -$!;
175     }
176    
177 dpavlin 1 }
178    
179     sub x_read {
180     my ($file,$bufsize,$off) = @_;
181     my ($rv) = -ENOSYS();
182     my $path = fixup( $file );
183 dpavlin 10
184 dpavlin 12 confess "no pending file $file ", dump( $pending ) unless defined( $pending->{$file} );
185    
186 dpavlin 1 return -ENOENT() unless -e $path;
187 dpavlin 10
188     my $fh = new IO::File;
189     return -ENOSYS() unless open($fh,$pending->{$file}->{path});
190    
191 dpavlin 1 if(seek($fh,$off,SEEK_SET)) {
192     read($fh,$rv,$bufsize);
193     }
194 dpavlin 10
195 dpavlin 1 return $rv;
196     }
197    
198     sub x_write {
199     my ($file,$buf,$off) = @_;
200 dpavlin 25
201 dpavlin 10 my $rv;
202 dpavlin 1 my $path = fixup($file);
203 dpavlin 10
204 dpavlin 12 confess "no pending file $file ", dump( $pending ) unless defined( $pending->{$file} );
205    
206 dpavlin 1 return -ENOENT() unless -e $path;
207 dpavlin 10
208 dpavlin 26 $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 dpavlin 10 my $fh = new IO::File;
212 dpavlin 26 return -ENOSYS() unless open($fh,'+<',$path);
213 dpavlin 1 if($rv = seek( $fh ,$off,SEEK_SET)) {
214     $rv = print( $fh $buf );
215 dpavlin 26 warn "## write $path offset $off [",length( $buf ), "]\n" if $debug;
216     $pending->{$file}->{write}++;
217 dpavlin 1 }
218     $rv = -ENOSYS() unless $rv;
219 dpavlin 26 close($fh) || warn "can't close $path: $!";
220 dpavlin 1 return length($buf);
221     }
222    
223     sub err { return (-shift || -$!) }
224    
225 dpavlin 27 sub x_readlink { return readlink(fixup(shift)); }
226    
227 dpavlin 25 sub x_unlink {
228     my $file = shift;
229     my $path = fixup( $file );
230 dpavlin 1
231 dpavlin 25 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 dpavlin 27 sub x_symlink {
247     my ($from,$to) = @_;
248 dpavlin 1
249 dpavlin 27 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 $rv;
275     }
276    
277 dpavlin 1 sub x_rename {
278 dpavlin 18 my ($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 dpavlin 25 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 dpavlin 18 }
295    
296 dpavlin 20 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 dpavlin 25 delete( $pending->{$old} );
304     warn "## tweaking pending to ", dump( $pending ) if $debug;
305 dpavlin 20 }
306    
307 dpavlin 1 return $err;
308     }
309    
310     sub x_chown {
311 dpavlin 26 my ($file,$uid,$gid) = @_;
312     my $path = fixup($file);
313 dpavlin 1 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 dpavlin 26
320     my $tmp = $mount->{tmp} . '/' . $file;
321     syscall(&SYS_lchown,$file,$uid,$gid,$path) if -e $tmp;
322    
323 dpavlin 1 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 dpavlin 14 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 dpavlin 21 warn "## truncate( $file $size ) $path [", -s $path, "] = $rv\n" if $debug;
343 dpavlin 15 $pending->{$file}->{write}++;
344 dpavlin 27
345     my $tmp = $mount->{tmp} . '/' . $file;
346     truncate( $tmp, $size ) if -e $tmp;
347    
348 dpavlin 14 return $rv;
349     }
350 dpavlin 1 sub x_utime { return utime($_[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 dpavlin 25
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 dpavlin 1 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 dpavlin 5 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 dpavlin 8 unlink $dest || confess "can't remove $dest: $!";
387 dpavlin 5 $dest =~ s/\.gz$//;
388     }
389    
390 dpavlin 1 if ( $file =~ $skip_extensions_regex ) {
391 dpavlin 27 warn "release $path [",-s $path,"] skipped compression\n";
392 dpavlin 5 file_copy( '<', $path, '>', $dest ) if ( $path ne $dest );
393     } elsif ( -s $path < $min_compress_size ) {
394 dpavlin 27 warn "release $path [",-s $path,"] uncompressed, too small\n";
395 dpavlin 5 file_copy( '<', $path, '>', $dest ) if ( $path ne $dest );
396 dpavlin 1 } else {
397 dpavlin 27 warn "release $path [",-s $path,"] compressing\n";
398 dpavlin 1
399 dpavlin 20 my $comp = $dest . '.gz';
400     file_copy( '<', $path, '>:gzip', $comp );
401 dpavlin 1
402 dpavlin 20 my ( $size_path, $size_comp ) = ( -s $path, -s $comp );
403 dpavlin 1
404 dpavlin 20 if ( $size_path <= $size_comp ) {
405     warn ">>> $size_path <= $size_comp leaving uncompressed\n";
406 dpavlin 27 unlink $comp || confess "can't remove: $comp: $!";
407 dpavlin 20 } else {
408     warn ">>> compressed $size_path -> $size_comp ",int(($size_comp * 100) / $size_path),"%\n";
409     # FIXME add timeout to remove uncompressed version?
410 dpavlin 27 unlink $path || confess "can't remove $path: $!";
411 dpavlin 20 }
412 dpavlin 1 }
413     } else {
414     warn "release $file, but still used ", $pending->{$file}->{open} , " times, delaying compression\n";
415     }
416 dpavlin 13 $pending->{$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 dpavlin 1 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 dpavlin 23 debug => $fuse_debug,
449 dpavlin 1 );

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