/[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 24 - (hide annotations)
Mon Jul 9 21:57:11 2007 UTC (12 years, 2 months ago) by dpavlin
File MIME type: text/plain
File size: 10417 byte(s)
fix
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 dpavlin 5 sub unlink_all {
80     my $file = shift;
81 dpavlin 8 warn "# unlink_all( $file )\n";
82    
83     my $path = fixup( $file );
84     unlink $path || return 0;
85    
86     my $tmp = $mount->{tmp} . '/' . $file;
87     unlink $tmp if ( -e $tmp );
88    
89 dpavlin 5 delete( $pending->{$file} );
90     return 1;
91     }
92    
93 dpavlin 1 sub x_getattr {
94     my ($file) = fixup(shift);
95     my (@list) = lstat($file);
96     $list[7] = gzip_original_size( $file ) if ( $list[7] && $file =~ m/\.gz$/ );
97     return -$! unless @list;
98     return @list;
99     }
100    
101     sub x_getdir {
102     my ($dirname) = fixup(shift);
103     unless(opendir(DIRHANDLE,$dirname)) {
104     return -ENOENT();
105     }
106     my @files = map { original_name( $_ ) } readdir(DIRHANDLE);
107     closedir(DIRHANDLE);
108     return (@files, 0);
109     }
110    
111     sub file_copy {
112     my ( $s_opt, $s_path, $d_opt, $d_path ) = @_;
113 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;
114 dpavlin 5 open(my $s, $s_opt, $s_path ) || confess "can't open $s_path: $!\npending = ", dump( $pending );
115     open(my $d, $d_opt, $d_path ) || confess "can't open $d_path: $!";
116 dpavlin 1 my $buff;
117     while( read( $s, $buff, 65535 ) ) {
118 dpavlin 5 print $d $buff || confess "can't write into $d_path: $!";
119 dpavlin 13 warn ">> [", length($buff), "] offset ", tell($s), " -> ", tell($d), "\n" if $debug;
120 dpavlin 1 }
121     close($d) || warn "can't close $d_path: $!";
122     close($s) || warn "can't close $s_path: $!";
123 dpavlin 5 warn "-- $s_path [", -s $s_path, "] >>> $d_path [", -s $d_path, "]\n" if $debug;
124     my ($mode,$uid,$gid,$atime,$mtime) = (stat $s_path)[2,4,5,8,9];
125    
126     chmod $mode, $d_path || warn "chmod( $mode $d_path ) failed: $!\n";
127     chown $uid,$gid,$d_path || warn "chown( $uid $gid $d_path ) failed: $!\n";
128     utime $atime,$mtime,$d_path || warn "utime( $atime $mtime $d_path ) failed: $!\n";
129 dpavlin 8
130     undef $d;
131     undef $s;
132 dpavlin 1 }
133    
134     sub x_open {
135     my ($file) = shift;
136     my ($mode) = shift;
137 dpavlin 12
138     if ( $file eq '/.debug' ) {
139     my $path = $mount->{from} . '/.debug';
140     open( my $debug, '>', $path ) || die "can't open $path: $!";
141     my $dump = dump( $pending );
142     print $debug "pending = $dump\n";
143     close($debug);
144     $pending->{'/.debug'}->{path} = $path;
145     warn "## created dump $path $dump\n";
146     return 0;
147     }
148    
149 dpavlin 1 $pending->{$file}->{open}++;
150 dpavlin 8
151     my $mode_desc = {
152     rdonly => $mode && O_RDONLY,
153     rdwr => $mode && O_RDWR,
154     append => $mode && O_APPEND,
155     create => $mode && O_CREAT,
156 dpavlin 14 trunc => $mode && O_TRUNC,
157 dpavlin 8 };
158 dpavlin 14 my $path = fixup($file);
159 dpavlin 19 warn "## open( $file, $mode ) pending: ", $pending->{$file}->{open}, " mode $mode: ", dump( $mode_desc )," $path [", -s $path, "]\n" if $debug;
160 dpavlin 1 my $fh;
161 dpavlin 8
162     my $tmp = $mount->{tmp} . '/' . $file;
163     if ( -e $tmp ) {
164     $path = $tmp;
165     } elsif ( $path =~ m/\.gz$/ ) {
166     my $dest_path = $tmp;
167     $dest_path =~ s!/[^/]+$!!; #!vim-fix
168     mkpath $dest_path unless -e $dest_path;
169 dpavlin 23 if ( -s $path ) {
170     file_copy( '<:gzip', $path, '>', $tmp )
171     } else {
172     warn "ERROR: filesystem corruption, $path is zero size\n";
173     }
174 dpavlin 8 $path = $tmp;
175     }
176    
177 dpavlin 21 if ( sysopen($fh , $path, $mode) ) {
178     close($fh) || confess "can't close $path: $!";
179     warn "<<< open $path [", -e $path ? -s $path : 'new' , "]\n";
180     $pending->{$file}->{path} = $path;
181     return 0;
182     } else {
183     warn "ERROR: can't open $path : $!";
184     return -$!;
185     }
186    
187 dpavlin 1 }
188    
189     sub x_read {
190     my ($file,$bufsize,$off) = @_;
191     my ($rv) = -ENOSYS();
192     my $path = fixup( $file );
193 dpavlin 10
194 dpavlin 12 confess "no pending file $file ", dump( $pending ) unless defined( $pending->{$file} );
195    
196 dpavlin 1 return -ENOENT() unless -e $path;
197 dpavlin 10
198     my $fh = new IO::File;
199     return -ENOSYS() unless open($fh,$pending->{$file}->{path});
200    
201 dpavlin 1 if(seek($fh,$off,SEEK_SET)) {
202     read($fh,$rv,$bufsize);
203     }
204 dpavlin 10
205 dpavlin 1 return $rv;
206     }
207    
208     sub x_write {
209     my ($file,$buf,$off) = @_;
210     $pending->{$file}->{write}++;
211 dpavlin 10 my $rv;
212 dpavlin 1 my $path = fixup($file);
213 dpavlin 10
214 dpavlin 12 confess "no pending file $file ", dump( $pending ) unless defined( $pending->{$file} );
215    
216 dpavlin 1 return -ENOENT() unless -e $path;
217 dpavlin 10
218     my $fh = new IO::File;
219     return -ENOSYS() unless open($fh,'+<',$pending->{$file}->{path});
220 dpavlin 1 if($rv = seek( $fh ,$off,SEEK_SET)) {
221     $rv = print( $fh $buf );
222 dpavlin 17 warn "## write ", $pending->{$file}->{path}, " $off ",length( $buf ), "\n" if $debug;
223 dpavlin 1 }
224     $rv = -ENOSYS() unless $rv;
225 dpavlin 12 close($fh);
226 dpavlin 1 return length($buf);
227     }
228    
229     sub err { return (-shift || -$!) }
230    
231     sub x_readlink { return readlink(fixup(shift)); }
232 dpavlin 5 sub x_unlink { return unlink_all( shift ) ? 0 : -$! }
233 dpavlin 1
234     sub x_symlink { return symlink(shift,fixup(shift)) ? 0 : -$!; }
235    
236     sub x_rename {
237 dpavlin 18 my ($old,$new) = @_;
238     my $old_path = fixup($old);
239     my $new_path = fixup($new);
240     $new_path .= '.gz' if ( $old_path =~ m/\.gz$/ && $new_path !~ m/\.gz$/ );
241    
242     my $err = rename($old_path,$new_path) ? 0 : -ENOENT();
243     warn "## rename( $old_path => $new_path ) = $err\n";
244    
245     my $tmp = $mount->{tmp} . '/' . $old;
246     if ( -e $tmp ) {
247     my $new_tmp = $mount->{tmp} . '/' . $new;
248     rename $tmp, $new_tmp || confess "can't rename $tmp -> $new_tmp : $!";
249     }
250    
251 dpavlin 20 if (defined( $pending->{$old} )) {
252     $pending->{$new} = $pending->{$old};
253    
254     my $path = $pending->{$old}->{path};
255     $path =~ s/\Q$old\E/$new/;
256     $pending->{$new}->{path} = $path;
257 dpavlin 23 $pending->{$old}->{path} = $path;
258 dpavlin 20
259 dpavlin 23 #delete( $pending->{$old} );
260 dpavlin 20 }
261    
262 dpavlin 1 return $err;
263     }
264     sub x_link { return link(fixup(shift),fixup(shift)) ? 0 : -$! }
265    
266     sub x_chown {
267     my ($path) = fixup(shift);
268     print "nonexistent $path\n" unless -e $path;
269     my ($uid,$gid) = @_;
270     # perl's chown() does not chown symlinks, it chowns the symlink's
271     # target. it fails when the link's target doesn't exist, because
272     # the stat64() syscall fails.
273     # this causes error messages when unpacking symlinks in tarballs.
274     my ($err) = syscall(&SYS_lchown,$path,$uid,$gid,$path) ? -$! : 0;
275     return $err;
276     }
277    
278     sub x_chmod {
279     my ($path) = fixup(shift);
280     my ($mode) = shift;
281     my ($err) = chmod($mode,$path) ? 0 : -$!;
282     return $err;
283     }
284    
285 dpavlin 14 sub x_truncate {
286     my ( $file,$size ) = @_;
287     my $path = fixup($file);
288     my $rv = truncate( $path, $size ) ? 0 : -$! ;
289     if ( $path =~ m/\.gz$/ ) {
290     my $no_gz = $path;
291     $no_gz =~ s/\.gz$//;
292     rename $path, $no_gz || confess "can't rename $path -> $no_gz: $!";
293     }
294 dpavlin 21 warn "## truncate( $file $size ) $path [", -s $path, "] = $rv\n" if $debug;
295 dpavlin 15 $pending->{$file}->{write}++;
296 dpavlin 14 return $rv;
297     }
298 dpavlin 1 sub x_utime { return utime($_[1],$_[2],fixup($_[0])) ? 0:-$!; }
299    
300     sub x_mkdir { my ($name, $perm) = @_; return 0 if mkdir(fixup($name),$perm); return -$!; }
301     sub x_rmdir { return 0 if rmdir fixup(shift); return -$!; }
302    
303     sub x_mknod {
304     # since this is called for ALL files, not just devices, I'll do some checks
305     # and possibly run the real mknod command.
306     my ($file, $modes, $dev) = @_;
307     $file = fixup($file);
308     $! = 0;
309     syscall(&SYS_mknod,$file,$modes,$dev);
310     return -$!;
311     }
312    
313     sub x_release {
314     my ( $file, $mode ) = @_;
315     if ( ! defined( $pending->{$file} ) ) {
316     warn "release $file, NO PENDING DATA\n";
317     return 0;
318     } elsif ( ! defined( $pending->{$file}->{write} ) ) {
319     warn "release $file, not written into\n";
320     } elsif ( defined( $pending->{$file}->{open} ) && $pending->{$file}->{open} == 1 ) {
321 dpavlin 5 my $path = $pending->{$file}->{path} || confess "no path for $file ? ", dump( $pending );
322     my $dest = fixup( $file );
323    
324     # cleanup old compressed copy
325     if ( $dest =~ /\.gz$/ ) {
326     warn "## remove old $dest\n";
327 dpavlin 8 unlink $dest || confess "can't remove $dest: $!";
328 dpavlin 5 $dest =~ s/\.gz$//;
329     }
330    
331 dpavlin 1 if ( $file =~ $skip_extensions_regex ) {
332 dpavlin 20 warn "release $file [",-s $path,"] skipped compression\n";
333 dpavlin 5 file_copy( '<', $path, '>', $dest ) if ( $path ne $dest );
334     } elsif ( -s $path < $min_compress_size ) {
335 dpavlin 20 warn "release $file [",-s $path,"] uncompressed, too small\n";
336 dpavlin 5 file_copy( '<', $path, '>', $dest ) if ( $path ne $dest );
337 dpavlin 1 } else {
338 dpavlin 20 warn "release $file [",-s $path,"] compressing\n";
339 dpavlin 1
340 dpavlin 20 my $comp = $dest . '.gz';
341     file_copy( '<', $path, '>:gzip', $comp );
342 dpavlin 1
343 dpavlin 20 my ( $size_path, $size_comp ) = ( -s $path, -s $comp );
344 dpavlin 1
345 dpavlin 20 if ( $size_path <= $size_comp ) {
346     warn ">>> $size_path <= $size_comp leaving uncompressed\n";
347     unlink $comp || warn "can't reamove: $comp: $!";
348     } else {
349     warn ">>> compressed $size_path -> $size_comp ",int(($size_comp * 100) / $size_path),"%\n";
350     # FIXME add timeout to remove uncompressed version?
351     unlink $path || warn "can't remove $path: $!";
352     }
353 dpavlin 1 }
354     } else {
355     warn "release $file, but still used ", $pending->{$file}->{open} , " times, delaying compression\n";
356     }
357 dpavlin 13 $pending->{$file}->{open}--;
358     if ( $pending->{$file}->{open} == 0 ) {
359     warn "## cleanup pending $file [", -s fixup($file), "]\n" if $debug;
360     delete( $pending->{$file} );
361     }
362 dpavlin 1 return 0;
363     }
364    
365     # kludge
366     sub x_statfs {return 255,1000000,500000,1000000,500000,4096}
367     Fuse::main(
368     mountpoint=>$mount->{to},
369     getattr =>"main::x_getattr",
370     readlink=>"main::x_readlink",
371     getdir =>"main::x_getdir",
372     mknod =>"main::x_mknod",
373     mkdir =>"main::x_mkdir",
374     unlink =>"main::x_unlink",
375     rmdir =>"main::x_rmdir",
376     symlink =>"main::x_symlink",
377     rename =>"main::x_rename",
378     link =>"main::x_link",
379     chmod =>"main::x_chmod",
380     chown =>"main::x_chown",
381     truncate=>"main::x_truncate",
382     utime =>"main::x_utime",
383     open =>"main::x_open",
384     read =>"main::x_read",
385     write =>"main::x_write",
386     statfs =>"main::x_statfs",
387     release =>"main::x_release",
388     # threaded=>1,
389 dpavlin 23 debug => $fuse_debug,
390 dpavlin 1 );

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