/[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 26 - (hide annotations)
Mon Jul 9 23:28:58 2007 UTC (12 years, 3 months ago) by dpavlin
File MIME type: text/plain
File size: 10969 byte(s)
* better log output
* write fixes: pending->{$file}->{write} counting, do sanity checking and error reporting in write
* cleanup chown and chown also cache file
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     sub fixup {
46     my ( $path ) = @_;
47     my $full = $mount->{from} . '/' . $path;
48     if ( -e $full . '.gz' ) {
49     return $full . '.gz';
50     }
51     return $full;
52     }
53    
54     sub original_name {
55     my $p = shift;
56     $p =~ s/\.gz$//;
57     return $p;
58     };
59    
60     sub gzip_original_size {
61     my $file = shift;
62    
63     return unless -e $file;
64    
65     my $buff;
66    
67     open(my $fh, $file) || die "can't open $file: $!";
68    
69     # read($fh, $buff, 10 );
70     # print dump( unpack("nccVcc", $buff ) );
71    
72     seek($fh, -4, 2);
73     read($fh, $buff, 4 );
74     close($fh);
75    
76     return unpack("L", $buff);
77     }
78    
79     sub x_getattr {
80     my ($file) = fixup(shift);
81     my (@list) = lstat($file);
82     $list[7] = gzip_original_size( $file ) if ( $list[7] && $file =~ m/\.gz$/ );
83     return -$! unless @list;
84     return @list;
85     }
86    
87     sub x_getdir {
88     my ($dirname) = fixup(shift);
89     unless(opendir(DIRHANDLE,$dirname)) {
90     return -ENOENT();
91     }
92     my @files = map { original_name( $_ ) } readdir(DIRHANDLE);
93     closedir(DIRHANDLE);
94     return (@files, 0);
95     }
96    
97     sub file_copy {
98     my ( $s_opt, $s_path, $d_opt, $d_path ) = @_;
99 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;
100 dpavlin 5 open(my $s, $s_opt, $s_path ) || confess "can't open $s_path: $!\npending = ", dump( $pending );
101     open(my $d, $d_opt, $d_path ) || confess "can't open $d_path: $!";
102 dpavlin 1 my $buff;
103     while( read( $s, $buff, 65535 ) ) {
104 dpavlin 5 print $d $buff || confess "can't write into $d_path: $!";
105 dpavlin 13 warn ">> [", length($buff), "] offset ", tell($s), " -> ", tell($d), "\n" if $debug;
106 dpavlin 1 }
107     close($d) || warn "can't close $d_path: $!";
108     close($s) || warn "can't close $s_path: $!";
109 dpavlin 5 warn "-- $s_path [", -s $s_path, "] >>> $d_path [", -s $d_path, "]\n" if $debug;
110     my ($mode,$uid,$gid,$atime,$mtime) = (stat $s_path)[2,4,5,8,9];
111    
112     chmod $mode, $d_path || warn "chmod( $mode $d_path ) failed: $!\n";
113     chown $uid,$gid,$d_path || warn "chown( $uid $gid $d_path ) failed: $!\n";
114     utime $atime,$mtime,$d_path || warn "utime( $atime $mtime $d_path ) failed: $!\n";
115 dpavlin 8
116     undef $d;
117     undef $s;
118 dpavlin 1 }
119    
120     sub x_open {
121     my ($file) = shift;
122     my ($mode) = shift;
123 dpavlin 12
124     if ( $file eq '/.debug' ) {
125     my $path = $mount->{from} . '/.debug';
126     open( my $debug, '>', $path ) || die "can't open $path: $!";
127     my $dump = dump( $pending );
128     print $debug "pending = $dump\n";
129     close($debug);
130     $pending->{'/.debug'}->{path} = $path;
131     warn "## created dump $path $dump\n";
132     return 0;
133     }
134    
135 dpavlin 1 $pending->{$file}->{open}++;
136 dpavlin 8
137     my $mode_desc = {
138     rdonly => $mode && O_RDONLY,
139     rdwr => $mode && O_RDWR,
140     append => $mode && O_APPEND,
141     create => $mode && O_CREAT,
142 dpavlin 14 trunc => $mode && O_TRUNC,
143 dpavlin 8 };
144 dpavlin 14 my $path = fixup($file);
145 dpavlin 19 warn "## open( $file, $mode ) pending: ", $pending->{$file}->{open}, " mode $mode: ", dump( $mode_desc )," $path [", -s $path, "]\n" if $debug;
146 dpavlin 1 my $fh;
147 dpavlin 8
148     my $tmp = $mount->{tmp} . '/' . $file;
149     if ( -e $tmp ) {
150     $path = $tmp;
151     } elsif ( $path =~ m/\.gz$/ ) {
152     my $dest_path = $tmp;
153     $dest_path =~ s!/[^/]+$!!; #!vim-fix
154     mkpath $dest_path unless -e $dest_path;
155 dpavlin 23 if ( -s $path ) {
156     file_copy( '<:gzip', $path, '>', $tmp )
157     } else {
158     warn "ERROR: filesystem corruption, $path is zero size\n";
159     }
160 dpavlin 8 $path = $tmp;
161     }
162    
163 dpavlin 21 if ( sysopen($fh , $path, $mode) ) {
164     close($fh) || confess "can't close $path: $!";
165     warn "<<< open $path [", -e $path ? -s $path : 'new' , "]\n";
166     $pending->{$file}->{path} = $path;
167     return 0;
168     } else {
169 dpavlin 26 warn "ERROR: can't open $path -- $!";
170 dpavlin 21 return -$!;
171     }
172    
173 dpavlin 1 }
174    
175     sub x_read {
176     my ($file,$bufsize,$off) = @_;
177     my ($rv) = -ENOSYS();
178     my $path = fixup( $file );
179 dpavlin 10
180 dpavlin 12 confess "no pending file $file ", dump( $pending ) unless defined( $pending->{$file} );
181    
182 dpavlin 1 return -ENOENT() unless -e $path;
183 dpavlin 10
184     my $fh = new IO::File;
185     return -ENOSYS() unless open($fh,$pending->{$file}->{path});
186    
187 dpavlin 1 if(seek($fh,$off,SEEK_SET)) {
188     read($fh,$rv,$bufsize);
189     }
190 dpavlin 10
191 dpavlin 1 return $rv;
192     }
193    
194     sub x_write {
195     my ($file,$buf,$off) = @_;
196 dpavlin 25
197 dpavlin 10 my $rv;
198 dpavlin 1 my $path = fixup($file);
199 dpavlin 10
200 dpavlin 12 confess "no pending file $file ", dump( $pending ) unless defined( $pending->{$file} );
201    
202 dpavlin 1 return -ENOENT() unless -e $path;
203 dpavlin 10
204 dpavlin 26 $path = $pending->{$file}->{path} || confess "no path for $file in ", dump( $pending );
205     confess "write into non-existant $path for $file: $!" unless -e $path;
206    
207 dpavlin 10 my $fh = new IO::File;
208 dpavlin 26 return -ENOSYS() unless open($fh,'+<',$path);
209 dpavlin 1 if($rv = seek( $fh ,$off,SEEK_SET)) {
210     $rv = print( $fh $buf );
211 dpavlin 26 warn "## write $path offset $off [",length( $buf ), "]\n" if $debug;
212     $pending->{$file}->{write}++;
213 dpavlin 1 }
214     $rv = -ENOSYS() unless $rv;
215 dpavlin 26 close($fh) || warn "can't close $path: $!";
216 dpavlin 1 return length($buf);
217     }
218    
219     sub err { return (-shift || -$!) }
220    
221     sub x_readlink { return readlink(fixup(shift)); }
222 dpavlin 25 sub x_unlink {
223     my $file = shift;
224     my $path = fixup( $file );
225 dpavlin 1
226 dpavlin 25 if ( $file =~ m#\Q/.fuse_hidden\E# ) {
227     return unlink $path ? 0 : -$1;
228     }
229    
230     warn "# unlink( $file )\n";
231    
232     unlink $path || return 0;
233    
234     my $tmp = $mount->{tmp} . '/' . $file;
235     unlink $tmp if ( -e $tmp );
236    
237     delete( $pending->{$file} );
238     return 0;
239     }
240    
241 dpavlin 1 sub x_symlink { return symlink(shift,fixup(shift)) ? 0 : -$!; }
242    
243     sub x_rename {
244 dpavlin 18 my ($old,$new) = @_;
245     my $old_path = fixup($old);
246     my $new_path = fixup($new);
247     $new_path .= '.gz' if ( $old_path =~ m/\.gz$/ && $new_path !~ m/\.gz$/ );
248    
249     my $err = rename($old_path,$new_path) ? 0 : -ENOENT();
250     warn "## rename( $old_path => $new_path ) = $err\n";
251    
252     my $tmp = $mount->{tmp} . '/' . $old;
253     if ( -e $tmp ) {
254 dpavlin 25 if ( $new =~ m#\Q/.fuse_hidden\E# ) {
255     unlink $tmp || confess "can't unlink $tmp for $new\n";
256     } else {
257     my $new_tmp = $mount->{tmp} . '/' . $new;
258     rename $tmp, $new_tmp || confess "can't rename $tmp -> $new_tmp : $!";
259     }
260 dpavlin 18 }
261    
262 dpavlin 20 if (defined( $pending->{$old} )) {
263     $pending->{$new} = $pending->{$old};
264    
265     my $path = $pending->{$old}->{path};
266     $path =~ s/\Q$old\E/$new/;
267     $pending->{$new}->{path} = $path;
268    
269 dpavlin 25 delete( $pending->{$old} );
270     warn "## tweaking pending to ", dump( $pending ) if $debug;
271 dpavlin 20 }
272    
273 dpavlin 1 return $err;
274     }
275     sub x_link { return link(fixup(shift),fixup(shift)) ? 0 : -$! }
276    
277     sub x_chown {
278 dpavlin 26 my ($file,$uid,$gid) = @_;
279     my $path = fixup($file);
280 dpavlin 1 print "nonexistent $path\n" unless -e $path;
281     # perl's chown() does not chown symlinks, it chowns the symlink's
282     # target. it fails when the link's target doesn't exist, because
283     # the stat64() syscall fails.
284     # this causes error messages when unpacking symlinks in tarballs.
285     my ($err) = syscall(&SYS_lchown,$path,$uid,$gid,$path) ? -$! : 0;
286 dpavlin 26
287     my $tmp = $mount->{tmp} . '/' . $file;
288     syscall(&SYS_lchown,$file,$uid,$gid,$path) if -e $tmp;
289    
290 dpavlin 1 return $err;
291     }
292    
293     sub x_chmod {
294     my ($path) = fixup(shift);
295     my ($mode) = shift;
296     my ($err) = chmod($mode,$path) ? 0 : -$!;
297     return $err;
298     }
299    
300 dpavlin 14 sub x_truncate {
301     my ( $file,$size ) = @_;
302     my $path = fixup($file);
303     my $rv = truncate( $path, $size ) ? 0 : -$! ;
304     if ( $path =~ m/\.gz$/ ) {
305     my $no_gz = $path;
306     $no_gz =~ s/\.gz$//;
307     rename $path, $no_gz || confess "can't rename $path -> $no_gz: $!";
308     }
309 dpavlin 21 warn "## truncate( $file $size ) $path [", -s $path, "] = $rv\n" if $debug;
310 dpavlin 15 $pending->{$file}->{write}++;
311 dpavlin 14 return $rv;
312     }
313 dpavlin 1 sub x_utime { return utime($_[1],$_[2],fixup($_[0])) ? 0:-$!; }
314    
315     sub x_mkdir { my ($name, $perm) = @_; return 0 if mkdir(fixup($name),$perm); return -$!; }
316     sub x_rmdir { return 0 if rmdir fixup(shift); return -$!; }
317    
318     sub x_mknod {
319     # since this is called for ALL files, not just devices, I'll do some checks
320     # and possibly run the real mknod command.
321     my ($file, $modes, $dev) = @_;
322     $file = fixup($file);
323     $! = 0;
324     syscall(&SYS_mknod,$file,$modes,$dev);
325     return -$!;
326     }
327    
328     sub x_release {
329     my ( $file, $mode ) = @_;
330 dpavlin 25
331     if ( $file =~ m#\Q/.fuse_hidden\E# ) {
332     warn "release internal $file\n" if $debug;
333     delete( $pending->{$file} );
334     return 0;
335     }
336    
337 dpavlin 1 if ( ! defined( $pending->{$file} ) ) {
338     warn "release $file, NO PENDING DATA\n";
339     return 0;
340     } elsif ( ! defined( $pending->{$file}->{write} ) ) {
341     warn "release $file, not written into\n";
342     } elsif ( defined( $pending->{$file}->{open} ) && $pending->{$file}->{open} == 1 ) {
343 dpavlin 5 my $path = $pending->{$file}->{path} || confess "no path for $file ? ", dump( $pending );
344     my $dest = fixup( $file );
345    
346     # cleanup old compressed copy
347     if ( $dest =~ /\.gz$/ ) {
348     warn "## remove old $dest\n";
349 dpavlin 8 unlink $dest || confess "can't remove $dest: $!";
350 dpavlin 5 $dest =~ s/\.gz$//;
351     }
352    
353 dpavlin 1 if ( $file =~ $skip_extensions_regex ) {
354 dpavlin 20 warn "release $file [",-s $path,"] skipped compression\n";
355 dpavlin 5 file_copy( '<', $path, '>', $dest ) if ( $path ne $dest );
356     } elsif ( -s $path < $min_compress_size ) {
357 dpavlin 20 warn "release $file [",-s $path,"] uncompressed, too small\n";
358 dpavlin 5 file_copy( '<', $path, '>', $dest ) if ( $path ne $dest );
359 dpavlin 1 } else {
360 dpavlin 20 warn "release $file [",-s $path,"] compressing\n";
361 dpavlin 1
362 dpavlin 20 my $comp = $dest . '.gz';
363     file_copy( '<', $path, '>:gzip', $comp );
364 dpavlin 1
365 dpavlin 20 my ( $size_path, $size_comp ) = ( -s $path, -s $comp );
366 dpavlin 1
367 dpavlin 20 if ( $size_path <= $size_comp ) {
368     warn ">>> $size_path <= $size_comp leaving uncompressed\n";
369     unlink $comp || warn "can't reamove: $comp: $!";
370     } else {
371     warn ">>> compressed $size_path -> $size_comp ",int(($size_comp * 100) / $size_path),"%\n";
372     # FIXME add timeout to remove uncompressed version?
373     unlink $path || warn "can't remove $path: $!";
374     }
375 dpavlin 1 }
376     } else {
377     warn "release $file, but still used ", $pending->{$file}->{open} , " times, delaying compression\n";
378     }
379 dpavlin 13 $pending->{$file}->{open}--;
380     if ( $pending->{$file}->{open} == 0 ) {
381     warn "## cleanup pending $file [", -s fixup($file), "]\n" if $debug;
382     delete( $pending->{$file} );
383     }
384 dpavlin 1 return 0;
385     }
386    
387     # kludge
388     sub x_statfs {return 255,1000000,500000,1000000,500000,4096}
389     Fuse::main(
390     mountpoint=>$mount->{to},
391     getattr =>"main::x_getattr",
392     readlink=>"main::x_readlink",
393     getdir =>"main::x_getdir",
394     mknod =>"main::x_mknod",
395     mkdir =>"main::x_mkdir",
396     unlink =>"main::x_unlink",
397     rmdir =>"main::x_rmdir",
398     symlink =>"main::x_symlink",
399     rename =>"main::x_rename",
400     link =>"main::x_link",
401     chmod =>"main::x_chmod",
402     chown =>"main::x_chown",
403     truncate=>"main::x_truncate",
404     utime =>"main::x_utime",
405     open =>"main::x_open",
406     read =>"main::x_read",
407     write =>"main::x_write",
408     statfs =>"main::x_statfs",
409     release =>"main::x_release",
410     # threaded=>1,
411 dpavlin 23 debug => $fuse_debug,
412 dpavlin 1 );

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