/[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 23 - (hide annotations)
Mon Jul 9 21:41:58 2007 UTC (12 years, 4 months ago) by dpavlin
File MIME type: text/plain
File size: 10443 byte(s)
* added command line paramentars --debug and --fuse-debug
* recover from corrupted zero-size compressed 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 20 my $debug = shift @ARGV;
32 dpavlin 1
33 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;
34 dpavlin 1
35 dpavlin 5 # don't compress files smaller than this
36 dpavlin 8 my $min_compress_size = 512;
37 dpavlin 5
38 dpavlin 1 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 fixup {
48     my ( $path ) = @_;
49     my $full = $mount->{from} . '/' . $path;
50     if ( -e $full . '.gz' ) {
51     return $full . '.gz';
52     }
53     return $full;
54     }
55    
56     sub original_name {
57     my $p = shift;
58     $p =~ s/\.gz$//;
59     return $p;
60     };
61    
62     sub gzip_original_size {
63     my $file = shift;
64    
65     return unless -e $file;
66    
67     my $buff;
68    
69     open(my $fh, $file) || die "can't open $file: $!";
70    
71     # read($fh, $buff, 10 );
72     # print dump( unpack("nccVcc", $buff ) );
73    
74     seek($fh, -4, 2);
75     read($fh, $buff, 4 );
76     close($fh);
77    
78     return unpack("L", $buff);
79     }
80    
81 dpavlin 5 sub unlink_all {
82     my $file = shift;
83 dpavlin 8 warn "# unlink_all( $file )\n";
84    
85     my $path = fixup( $file );
86     unlink $path || return 0;
87    
88     my $tmp = $mount->{tmp} . '/' . $file;
89     unlink $tmp if ( -e $tmp );
90    
91 dpavlin 5 delete( $pending->{$file} );
92     return 1;
93     }
94    
95 dpavlin 1 sub x_getattr {
96     my ($file) = fixup(shift);
97     my (@list) = lstat($file);
98     $list[7] = gzip_original_size( $file ) if ( $list[7] && $file =~ m/\.gz$/ );
99     return -$! unless @list;
100     return @list;
101     }
102    
103     sub x_getdir {
104     my ($dirname) = fixup(shift);
105     unless(opendir(DIRHANDLE,$dirname)) {
106     return -ENOENT();
107     }
108     my @files = map { original_name( $_ ) } readdir(DIRHANDLE);
109     closedir(DIRHANDLE);
110     return (@files, 0);
111     }
112    
113     sub file_copy {
114     my ( $s_opt, $s_path, $d_opt, $d_path ) = @_;
115 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;
116 dpavlin 5 open(my $s, $s_opt, $s_path ) || confess "can't open $s_path: $!\npending = ", dump( $pending );
117     open(my $d, $d_opt, $d_path ) || confess "can't open $d_path: $!";
118 dpavlin 1 my $buff;
119     while( read( $s, $buff, 65535 ) ) {
120 dpavlin 5 print $d $buff || confess "can't write into $d_path: $!";
121 dpavlin 13 warn ">> [", length($buff), "] offset ", tell($s), " -> ", tell($d), "\n" if $debug;
122 dpavlin 1 }
123     close($d) || warn "can't close $d_path: $!";
124     close($s) || warn "can't close $s_path: $!";
125 dpavlin 5 warn "-- $s_path [", -s $s_path, "] >>> $d_path [", -s $d_path, "]\n" if $debug;
126     my ($mode,$uid,$gid,$atime,$mtime) = (stat $s_path)[2,4,5,8,9];
127    
128     chmod $mode, $d_path || warn "chmod( $mode $d_path ) failed: $!\n";
129     chown $uid,$gid,$d_path || warn "chown( $uid $gid $d_path ) failed: $!\n";
130     utime $atime,$mtime,$d_path || warn "utime( $atime $mtime $d_path ) failed: $!\n";
131 dpavlin 8
132     undef $d;
133     undef $s;
134 dpavlin 1 }
135    
136     sub x_open {
137     my ($file) = shift;
138     my ($mode) = shift;
139 dpavlin 12
140     if ( $file eq '/.debug' ) {
141     my $path = $mount->{from} . '/.debug';
142     open( my $debug, '>', $path ) || die "can't open $path: $!";
143     my $dump = dump( $pending );
144     print $debug "pending = $dump\n";
145     close($debug);
146     $pending->{'/.debug'}->{path} = $path;
147     warn "## created dump $path $dump\n";
148     return 0;
149     }
150    
151 dpavlin 1 $pending->{$file}->{open}++;
152 dpavlin 8
153     my $mode_desc = {
154     rdonly => $mode && O_RDONLY,
155     rdwr => $mode && O_RDWR,
156     append => $mode && O_APPEND,
157     create => $mode && O_CREAT,
158 dpavlin 14 trunc => $mode && O_TRUNC,
159 dpavlin 8 };
160 dpavlin 14 my $path = fixup($file);
161 dpavlin 19 warn "## open( $file, $mode ) pending: ", $pending->{$file}->{open}, " mode $mode: ", dump( $mode_desc )," $path [", -s $path, "]\n" if $debug;
162 dpavlin 1 my $fh;
163 dpavlin 8
164     my $tmp = $mount->{tmp} . '/' . $file;
165     if ( -e $tmp ) {
166     $path = $tmp;
167     } elsif ( $path =~ m/\.gz$/ ) {
168     my $dest_path = $tmp;
169     $dest_path =~ s!/[^/]+$!!; #!vim-fix
170     mkpath $dest_path unless -e $dest_path;
171 dpavlin 23 if ( -s $path ) {
172     file_copy( '<:gzip', $path, '>', $tmp )
173     } else {
174     warn "ERROR: filesystem corruption, $path is zero size\n";
175     }
176 dpavlin 8 $path = $tmp;
177     }
178    
179 dpavlin 21 if ( sysopen($fh , $path, $mode) ) {
180     close($fh) || confess "can't close $path: $!";
181     warn "<<< open $path [", -e $path ? -s $path : 'new' , "]\n";
182     $pending->{$file}->{path} = $path;
183     return 0;
184     } else {
185     warn "ERROR: can't open $path : $!";
186     return -$!;
187     }
188    
189 dpavlin 1 }
190    
191     sub x_read {
192     my ($file,$bufsize,$off) = @_;
193     my ($rv) = -ENOSYS();
194     my $path = fixup( $file );
195 dpavlin 10
196 dpavlin 12 confess "no pending file $file ", dump( $pending ) unless defined( $pending->{$file} );
197    
198 dpavlin 1 return -ENOENT() unless -e $path;
199 dpavlin 10
200     my $fh = new IO::File;
201     return -ENOSYS() unless open($fh,$pending->{$file}->{path});
202    
203 dpavlin 1 if(seek($fh,$off,SEEK_SET)) {
204     read($fh,$rv,$bufsize);
205     }
206 dpavlin 10
207 dpavlin 1 return $rv;
208     }
209    
210     sub x_write {
211     my ($file,$buf,$off) = @_;
212     $pending->{$file}->{write}++;
213 dpavlin 10 my $rv;
214 dpavlin 1 my $path = fixup($file);
215 dpavlin 10
216 dpavlin 12 confess "no pending file $file ", dump( $pending ) unless defined( $pending->{$file} );
217    
218 dpavlin 1 return -ENOENT() unless -e $path;
219 dpavlin 10
220     my $fh = new IO::File;
221     return -ENOSYS() unless open($fh,'+<',$pending->{$file}->{path});
222 dpavlin 1 if($rv = seek( $fh ,$off,SEEK_SET)) {
223     $rv = print( $fh $buf );
224 dpavlin 17 warn "## write ", $pending->{$file}->{path}, " $off ",length( $buf ), "\n" if $debug;
225 dpavlin 1 }
226     $rv = -ENOSYS() unless $rv;
227 dpavlin 12 close($fh);
228 dpavlin 1 return length($buf);
229     }
230    
231     sub err { return (-shift || -$!) }
232    
233     sub x_readlink { return readlink(fixup(shift)); }
234 dpavlin 5 sub x_unlink { return unlink_all( shift ) ? 0 : -$! }
235 dpavlin 1
236     sub x_symlink { return symlink(shift,fixup(shift)) ? 0 : -$!; }
237    
238     sub x_rename {
239 dpavlin 18 my ($old,$new) = @_;
240     my $old_path = fixup($old);
241     my $new_path = fixup($new);
242     $new_path .= '.gz' if ( $old_path =~ m/\.gz$/ && $new_path !~ m/\.gz$/ );
243    
244     my $err = rename($old_path,$new_path) ? 0 : -ENOENT();
245     warn "## rename( $old_path => $new_path ) = $err\n";
246    
247     my $tmp = $mount->{tmp} . '/' . $old;
248     if ( -e $tmp ) {
249     my $new_tmp = $mount->{tmp} . '/' . $new;
250     rename $tmp, $new_tmp || confess "can't rename $tmp -> $new_tmp : $!";
251     }
252    
253 dpavlin 20 if (defined( $pending->{$old} )) {
254     $pending->{$new} = $pending->{$old};
255    
256     my $path = $pending->{$old}->{path};
257     $path =~ s/\Q$old\E/$new/;
258     $pending->{$new}->{path} = $path;
259 dpavlin 23 $pending->{$old}->{path} = $path;
260 dpavlin 20
261 dpavlin 23 #delete( $pending->{$old} );
262 dpavlin 20 }
263    
264 dpavlin 1 return $err;
265     }
266     sub x_link { return link(fixup(shift),fixup(shift)) ? 0 : -$! }
267    
268     sub x_chown {
269     my ($path) = fixup(shift);
270     print "nonexistent $path\n" unless -e $path;
271     my ($uid,$gid) = @_;
272     # perl's chown() does not chown symlinks, it chowns the symlink's
273     # target. it fails when the link's target doesn't exist, because
274     # the stat64() syscall fails.
275     # this causes error messages when unpacking symlinks in tarballs.
276     my ($err) = syscall(&SYS_lchown,$path,$uid,$gid,$path) ? -$! : 0;
277     return $err;
278     }
279    
280     sub x_chmod {
281     my ($path) = fixup(shift);
282     my ($mode) = shift;
283     my ($err) = chmod($mode,$path) ? 0 : -$!;
284     return $err;
285     }
286    
287 dpavlin 14 sub x_truncate {
288     my ( $file,$size ) = @_;
289     my $path = fixup($file);
290     my $rv = truncate( $path, $size ) ? 0 : -$! ;
291     if ( $path =~ m/\.gz$/ ) {
292     my $no_gz = $path;
293     $no_gz =~ s/\.gz$//;
294     rename $path, $no_gz || confess "can't rename $path -> $no_gz: $!";
295     }
296 dpavlin 21 warn "## truncate( $file $size ) $path [", -s $path, "] = $rv\n" if $debug;
297 dpavlin 15 $pending->{$file}->{write}++;
298 dpavlin 14 return $rv;
299     }
300 dpavlin 1 sub x_utime { return utime($_[1],$_[2],fixup($_[0])) ? 0:-$!; }
301    
302     sub x_mkdir { my ($name, $perm) = @_; return 0 if mkdir(fixup($name),$perm); return -$!; }
303     sub x_rmdir { return 0 if rmdir fixup(shift); return -$!; }
304    
305     sub x_mknod {
306     # since this is called for ALL files, not just devices, I'll do some checks
307     # and possibly run the real mknod command.
308     my ($file, $modes, $dev) = @_;
309     $file = fixup($file);
310     $! = 0;
311     syscall(&SYS_mknod,$file,$modes,$dev);
312     return -$!;
313     }
314    
315     sub x_release {
316     my ( $file, $mode ) = @_;
317     if ( ! defined( $pending->{$file} ) ) {
318     warn "release $file, NO PENDING DATA\n";
319     return 0;
320     } elsif ( ! defined( $pending->{$file}->{write} ) ) {
321     warn "release $file, not written into\n";
322     } elsif ( defined( $pending->{$file}->{open} ) && $pending->{$file}->{open} == 1 ) {
323 dpavlin 5 my $path = $pending->{$file}->{path} || confess "no path for $file ? ", dump( $pending );
324     my $dest = fixup( $file );
325    
326     # cleanup old compressed copy
327     if ( $dest =~ /\.gz$/ ) {
328     warn "## remove old $dest\n";
329 dpavlin 8 unlink $dest || confess "can't remove $dest: $!";
330 dpavlin 5 $dest =~ s/\.gz$//;
331     }
332    
333 dpavlin 1 if ( $file =~ $skip_extensions_regex ) {
334 dpavlin 20 warn "release $file [",-s $path,"] skipped compression\n";
335 dpavlin 5 file_copy( '<', $path, '>', $dest ) if ( $path ne $dest );
336     } elsif ( -s $path < $min_compress_size ) {
337 dpavlin 20 warn "release $file [",-s $path,"] uncompressed, too small\n";
338 dpavlin 5 file_copy( '<', $path, '>', $dest ) if ( $path ne $dest );
339 dpavlin 1 } else {
340 dpavlin 20 warn "release $file [",-s $path,"] compressing\n";
341 dpavlin 1
342 dpavlin 20 my $comp = $dest . '.gz';
343     file_copy( '<', $path, '>:gzip', $comp );
344 dpavlin 1
345 dpavlin 20 my ( $size_path, $size_comp ) = ( -s $path, -s $comp );
346 dpavlin 1
347 dpavlin 20 if ( $size_path <= $size_comp ) {
348     warn ">>> $size_path <= $size_comp leaving uncompressed\n";
349     unlink $comp || warn "can't reamove: $comp: $!";
350     } else {
351     warn ">>> compressed $size_path -> $size_comp ",int(($size_comp * 100) / $size_path),"%\n";
352     # FIXME add timeout to remove uncompressed version?
353     unlink $path || warn "can't remove $path: $!";
354     }
355 dpavlin 1 }
356     } else {
357     warn "release $file, but still used ", $pending->{$file}->{open} , " times, delaying compression\n";
358     }
359 dpavlin 13 $pending->{$file}->{open}--;
360     if ( $pending->{$file}->{open} == 0 ) {
361     warn "## cleanup pending $file [", -s fixup($file), "]\n" if $debug;
362     delete( $pending->{$file} );
363     }
364 dpavlin 1 return 0;
365     }
366    
367     # kludge
368     sub x_statfs {return 255,1000000,500000,1000000,500000,4096}
369     Fuse::main(
370     mountpoint=>$mount->{to},
371     getattr =>"main::x_getattr",
372     readlink=>"main::x_readlink",
373     getdir =>"main::x_getdir",
374     mknod =>"main::x_mknod",
375     mkdir =>"main::x_mkdir",
376     unlink =>"main::x_unlink",
377     rmdir =>"main::x_rmdir",
378     symlink =>"main::x_symlink",
379     rename =>"main::x_rename",
380     link =>"main::x_link",
381     chmod =>"main::x_chmod",
382     chown =>"main::x_chown",
383     truncate=>"main::x_truncate",
384     utime =>"main::x_utime",
385     open =>"main::x_open",
386     read =>"main::x_read",
387     write =>"main::x_write",
388     statfs =>"main::x_statfs",
389     release =>"main::x_release",
390     # threaded=>1,
391 dpavlin 23 debug => $fuse_debug,
392 dpavlin 1 );

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