/[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 23 - (show 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 #!/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 $debug = shift @ARGV;
32
33 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
35 # don't compress files smaller than this
36 my $min_compress_size = 512;
37
38 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 sub unlink_all {
82 my $file = shift;
83 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 delete( $pending->{$file} );
92 return 1;
93 }
94
95 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 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 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 my $buff;
119 while( read( $s, $buff, 65535 ) ) {
120 print $d $buff || confess "can't write into $d_path: $!";
121 warn ">> [", length($buff), "] offset ", tell($s), " -> ", tell($d), "\n" if $debug;
122 }
123 close($d) || warn "can't close $d_path: $!";
124 close($s) || warn "can't close $s_path: $!";
125 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
132 undef $d;
133 undef $s;
134 }
135
136 sub x_open {
137 my ($file) = shift;
138 my ($mode) = shift;
139
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 $pending->{$file}->{open}++;
152
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 trunc => $mode && O_TRUNC,
159 };
160 my $path = fixup($file);
161 warn "## open( $file, $mode ) pending: ", $pending->{$file}->{open}, " mode $mode: ", dump( $mode_desc )," $path [", -s $path, "]\n" if $debug;
162 my $fh;
163
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 if ( -s $path ) {
172 file_copy( '<:gzip', $path, '>', $tmp )
173 } else {
174 warn "ERROR: filesystem corruption, $path is zero size\n";
175 }
176 $path = $tmp;
177 }
178
179 if ( sysopen($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 }
190
191 sub x_read {
192 my ($file,$bufsize,$off) = @_;
193 my ($rv) = -ENOSYS();
194 my $path = fixup( $file );
195
196 confess "no pending file $file ", dump( $pending ) unless defined( $pending->{$file} );
197
198 return -ENOENT() unless -e $path;
199
200 my $fh = new IO::File;
201 return -ENOSYS() unless open($fh,$pending->{$file}->{path});
202
203 if(seek($fh,$off,SEEK_SET)) {
204 read($fh,$rv,$bufsize);
205 }
206
207 return $rv;
208 }
209
210 sub x_write {
211 my ($file,$buf,$off) = @_;
212 $pending->{$file}->{write}++;
213 my $rv;
214 my $path = fixup($file);
215
216 confess "no pending file $file ", dump( $pending ) unless defined( $pending->{$file} );
217
218 return -ENOENT() unless -e $path;
219
220 my $fh = new IO::File;
221 return -ENOSYS() unless open($fh,'+<',$pending->{$file}->{path});
222 if($rv = seek( $fh ,$off,SEEK_SET)) {
223 $rv = print( $fh $buf );
224 warn "## write ", $pending->{$file}->{path}, " $off ",length( $buf ), "\n" if $debug;
225 }
226 $rv = -ENOSYS() unless $rv;
227 close($fh);
228 return length($buf);
229 }
230
231 sub err { return (-shift || -$!) }
232
233 sub x_readlink { return readlink(fixup(shift)); }
234 sub x_unlink { return unlink_all( shift ) ? 0 : -$! }
235
236 sub x_symlink { return symlink(shift,fixup(shift)) ? 0 : -$!; }
237
238 sub x_rename {
239 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 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 $pending->{$old}->{path} = $path;
260
261 #delete( $pending->{$old} );
262 }
263
264 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 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 warn "## truncate( $file $size ) $path [", -s $path, "] = $rv\n" if $debug;
297 $pending->{$file}->{write}++;
298 return $rv;
299 }
300 sub x_utime { return utime($_[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 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 unlink $dest || confess "can't remove $dest: $!";
330 $dest =~ s/\.gz$//;
331 }
332
333 if ( $file =~ $skip_extensions_regex ) {
334 warn "release $file [",-s $path,"] skipped compression\n";
335 file_copy( '<', $path, '>', $dest ) if ( $path ne $dest );
336 } elsif ( -s $path < $min_compress_size ) {
337 warn "release $file [",-s $path,"] uncompressed, too small\n";
338 file_copy( '<', $path, '>', $dest ) if ( $path ne $dest );
339 } else {
340 warn "release $file [",-s $path,"] compressing\n";
341
342 my $comp = $dest . '.gz';
343 file_copy( '<', $path, '>:gzip', $comp );
344
345 my ( $size_path, $size_comp ) = ( -s $path, -s $comp );
346
347 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 }
356 } else {
357 warn "release $file, but still used ", $pending->{$file}->{open} , " times, delaying compression\n";
358 }
359 $pending->{$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 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 debug => $fuse_debug,
392 );

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