/[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!
ViewVC logotype

Contents of /fuse-comp.pl

Parent Directory Parent Directory | Revision Log Revision Log


Revision 25 - (show annotations)
Mon Jul 9 22:44:20 2007 UTC (12 years, 4 months ago) by dpavlin
File MIME type: text/plain
File size: 10708 byte(s)
hopefually correct handling of .fuse_hidden files which are created
when open file is unlinked.

unlink cleanup, final rename tweaking and tests
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 $skip_extensions_regex = qr/\.(?:sw[a-z]|gif|png|jpeg|jpg|avi|rar|zip|bz2|gz|tgz|avi|mpeg|mpg|tmp|temp)$/i;
32
33 # don't compress files smaller than this
34 my $min_compress_size = 512;
35
36 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 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 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 my $buff;
103 while( read( $s, $buff, 65535 ) ) {
104 print $d $buff || confess "can't write into $d_path: $!";
105 warn ">> [", length($buff), "] offset ", tell($s), " -> ", tell($d), "\n" if $debug;
106 }
107 close($d) || warn "can't close $d_path: $!";
108 close($s) || warn "can't close $s_path: $!";
109 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
116 undef $d;
117 undef $s;
118 }
119
120 sub x_open {
121 my ($file) = shift;
122 my ($mode) = shift;
123
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 $pending->{$file}->{open}++;
136
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 trunc => $mode && O_TRUNC,
143 };
144 my $path = fixup($file);
145 warn "## open( $file, $mode ) pending: ", $pending->{$file}->{open}, " mode $mode: ", dump( $mode_desc )," $path [", -s $path, "]\n" if $debug;
146 my $fh;
147
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 if ( -s $path ) {
156 file_copy( '<:gzip', $path, '>', $tmp )
157 } else {
158 warn "ERROR: filesystem corruption, $path is zero size\n";
159 }
160 $path = $tmp;
161 }
162
163 if ( sysopen($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 warn "ERROR: can't open $path : $!";
170 return -$!;
171 }
172
173 }
174
175 sub x_read {
176 my ($file,$bufsize,$off) = @_;
177 my ($rv) = -ENOSYS();
178 my $path = fixup( $file );
179
180 confess "no pending file $file ", dump( $pending ) unless defined( $pending->{$file} );
181
182 return -ENOENT() unless -e $path;
183
184 my $fh = new IO::File;
185 return -ENOSYS() unless open($fh,$pending->{$file}->{path});
186
187 if(seek($fh,$off,SEEK_SET)) {
188 read($fh,$rv,$bufsize);
189 }
190
191 return $rv;
192 }
193
194 sub x_write {
195 my ($file,$buf,$off) = @_;
196
197 $pending->{$file}->{write}++;
198 my $rv;
199 my $path = fixup($file);
200
201 confess "no pending file $file ", dump( $pending ) unless defined( $pending->{$file} );
202
203 return -ENOENT() unless -e $path;
204
205 my $fh = new IO::File;
206 return -ENOSYS() unless open($fh,'+<',$pending->{$file}->{path});
207 if($rv = seek( $fh ,$off,SEEK_SET)) {
208 $rv = print( $fh $buf );
209 warn "## write ", $pending->{$file}->{path}, " $off ",length( $buf ), "\n" if $debug;
210 }
211 $rv = -ENOSYS() unless $rv;
212 close($fh);
213 return length($buf);
214 }
215
216 sub err { return (-shift || -$!) }
217
218 sub x_readlink { return readlink(fixup(shift)); }
219 sub x_unlink {
220 my $file = shift;
221 my $path = fixup( $file );
222
223 if ( $file =~ m#\Q/.fuse_hidden\E# ) {
224 return unlink $path ? 0 : -$1;
225 }
226
227 warn "# unlink( $file )\n";
228
229 unlink $path || return 0;
230
231 my $tmp = $mount->{tmp} . '/' . $file;
232 unlink $tmp if ( -e $tmp );
233
234 delete( $pending->{$file} );
235 return 0;
236 }
237
238 sub x_symlink { return symlink(shift,fixup(shift)) ? 0 : -$!; }
239
240 sub x_rename {
241 my ($old,$new) = @_;
242 my $old_path = fixup($old);
243 my $new_path = fixup($new);
244 $new_path .= '.gz' if ( $old_path =~ m/\.gz$/ && $new_path !~ m/\.gz$/ );
245
246 my $err = rename($old_path,$new_path) ? 0 : -ENOENT();
247 warn "## rename( $old_path => $new_path ) = $err\n";
248
249 my $tmp = $mount->{tmp} . '/' . $old;
250 if ( -e $tmp ) {
251 if ( $new =~ m#\Q/.fuse_hidden\E# ) {
252 unlink $tmp || confess "can't unlink $tmp for $new\n";
253 } else {
254 my $new_tmp = $mount->{tmp} . '/' . $new;
255 rename $tmp, $new_tmp || confess "can't rename $tmp -> $new_tmp : $!";
256 }
257 }
258
259 if (defined( $pending->{$old} )) {
260 $pending->{$new} = $pending->{$old};
261
262 my $path = $pending->{$old}->{path};
263 $path =~ s/\Q$old\E/$new/;
264 $pending->{$new}->{path} = $path;
265
266 delete( $pending->{$old} );
267 warn "## tweaking pending to ", dump( $pending ) if $debug;
268 }
269
270 return $err;
271 }
272 sub x_link { return link(fixup(shift),fixup(shift)) ? 0 : -$! }
273
274 sub x_chown {
275 my ($path) = fixup(shift);
276 print "nonexistent $path\n" unless -e $path;
277 my ($uid,$gid) = @_;
278 # perl's chown() does not chown symlinks, it chowns the symlink's
279 # target. it fails when the link's target doesn't exist, because
280 # the stat64() syscall fails.
281 # this causes error messages when unpacking symlinks in tarballs.
282 my ($err) = syscall(&SYS_lchown,$path,$uid,$gid,$path) ? -$! : 0;
283 return $err;
284 }
285
286 sub x_chmod {
287 my ($path) = fixup(shift);
288 my ($mode) = shift;
289 my ($err) = chmod($mode,$path) ? 0 : -$!;
290 return $err;
291 }
292
293 sub x_truncate {
294 my ( $file,$size ) = @_;
295 my $path = fixup($file);
296 my $rv = truncate( $path, $size ) ? 0 : -$! ;
297 if ( $path =~ m/\.gz$/ ) {
298 my $no_gz = $path;
299 $no_gz =~ s/\.gz$//;
300 rename $path, $no_gz || confess "can't rename $path -> $no_gz: $!";
301 }
302 warn "## truncate( $file $size ) $path [", -s $path, "] = $rv\n" if $debug;
303 $pending->{$file}->{write}++;
304 return $rv;
305 }
306 sub x_utime { return utime($_[1],$_[2],fixup($_[0])) ? 0:-$!; }
307
308 sub x_mkdir { my ($name, $perm) = @_; return 0 if mkdir(fixup($name),$perm); return -$!; }
309 sub x_rmdir { return 0 if rmdir fixup(shift); return -$!; }
310
311 sub x_mknod {
312 # since this is called for ALL files, not just devices, I'll do some checks
313 # and possibly run the real mknod command.
314 my ($file, $modes, $dev) = @_;
315 $file = fixup($file);
316 $! = 0;
317 syscall(&SYS_mknod,$file,$modes,$dev);
318 return -$!;
319 }
320
321 sub x_release {
322 my ( $file, $mode ) = @_;
323
324 if ( $file =~ m#\Q/.fuse_hidden\E# ) {
325 warn "release internal $file\n" if $debug;
326 delete( $pending->{$file} );
327 return 0;
328 }
329
330 if ( ! defined( $pending->{$file} ) ) {
331 warn "release $file, NO PENDING DATA\n";
332 return 0;
333 } elsif ( ! defined( $pending->{$file}->{write} ) ) {
334 warn "release $file, not written into\n";
335 } elsif ( defined( $pending->{$file}->{open} ) && $pending->{$file}->{open} == 1 ) {
336 my $path = $pending->{$file}->{path} || confess "no path for $file ? ", dump( $pending );
337 my $dest = fixup( $file );
338
339 # cleanup old compressed copy
340 if ( $dest =~ /\.gz$/ ) {
341 warn "## remove old $dest\n";
342 unlink $dest || confess "can't remove $dest: $!";
343 $dest =~ s/\.gz$//;
344 }
345
346 if ( $file =~ $skip_extensions_regex ) {
347 warn "release $file [",-s $path,"] skipped compression\n";
348 file_copy( '<', $path, '>', $dest ) if ( $path ne $dest );
349 } elsif ( -s $path < $min_compress_size ) {
350 warn "release $file [",-s $path,"] uncompressed, too small\n";
351 file_copy( '<', $path, '>', $dest ) if ( $path ne $dest );
352 } else {
353 warn "release $file [",-s $path,"] compressing\n";
354
355 my $comp = $dest . '.gz';
356 file_copy( '<', $path, '>:gzip', $comp );
357
358 my ( $size_path, $size_comp ) = ( -s $path, -s $comp );
359
360 if ( $size_path <= $size_comp ) {
361 warn ">>> $size_path <= $size_comp leaving uncompressed\n";
362 unlink $comp || warn "can't reamove: $comp: $!";
363 } else {
364 warn ">>> compressed $size_path -> $size_comp ",int(($size_comp * 100) / $size_path),"%\n";
365 # FIXME add timeout to remove uncompressed version?
366 unlink $path || warn "can't remove $path: $!";
367 }
368 }
369 } else {
370 warn "release $file, but still used ", $pending->{$file}->{open} , " times, delaying compression\n";
371 }
372 $pending->{$file}->{open}--;
373 if ( $pending->{$file}->{open} == 0 ) {
374 warn "## cleanup pending $file [", -s fixup($file), "]\n" if $debug;
375 delete( $pending->{$file} );
376 }
377 return 0;
378 }
379
380 # kludge
381 sub x_statfs {return 255,1000000,500000,1000000,500000,4096}
382 Fuse::main(
383 mountpoint=>$mount->{to},
384 getattr =>"main::x_getattr",
385 readlink=>"main::x_readlink",
386 getdir =>"main::x_getdir",
387 mknod =>"main::x_mknod",
388 mkdir =>"main::x_mkdir",
389 unlink =>"main::x_unlink",
390 rmdir =>"main::x_rmdir",
391 symlink =>"main::x_symlink",
392 rename =>"main::x_rename",
393 link =>"main::x_link",
394 chmod =>"main::x_chmod",
395 chown =>"main::x_chown",
396 truncate=>"main::x_truncate",
397 utime =>"main::x_utime",
398 open =>"main::x_open",
399 read =>"main::x_read",
400 write =>"main::x_write",
401 statfs =>"main::x_statfs",
402 release =>"main::x_release",
403 # threaded=>1,
404 debug => $fuse_debug,
405 );

Properties

Name Value
svn:executable *

  ViewVC Help
Powered by ViewVC 1.1.26