/[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 19 - (hide annotations)
Mon Jul 9 15:59:57 2007 UTC (12 years, 5 months ago) by dpavlin
File MIME type: text/plain
File size: 9548 byte(s)
less output without debug on
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 1
16     my $mount = {
17     from => '/tmp/comp',
18     to => '/tmp/no-comp',
19     tmp => '/dev/shm/comp',
20     };
21    
22 dpavlin 19 my $debug = 0;
23 dpavlin 1
24 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;
25 dpavlin 1
26 dpavlin 5 # don't compress files smaller than this
27 dpavlin 8 my $min_compress_size = 512;
28 dpavlin 5
29 dpavlin 1 foreach my $dir ( keys %$mount ) {
30     if ( ! -e $mount->{$dir} ) {
31     warn "created $mount->{$dir}\n";
32     mkdir $mount->{$dir} || die "can't create $mount->{$dir}: $!";
33     }
34     }
35    
36     my $pending;
37    
38     sub fixup {
39     my ( $path ) = @_;
40     my $full = $mount->{from} . '/' . $path;
41     if ( -e $full . '.gz' ) {
42     return $full . '.gz';
43     }
44     return $full;
45     }
46    
47     sub original_name {
48     my $p = shift;
49     $p =~ s/\.gz$//;
50     return $p;
51     };
52    
53     sub gzip_original_size {
54     my $file = shift;
55    
56     return unless -e $file;
57    
58     my $buff;
59    
60     open(my $fh, $file) || die "can't open $file: $!";
61    
62     # read($fh, $buff, 10 );
63     # print dump( unpack("nccVcc", $buff ) );
64    
65     seek($fh, -4, 2);
66     read($fh, $buff, 4 );
67     close($fh);
68    
69     return unpack("L", $buff);
70     }
71    
72 dpavlin 5 sub unlink_all {
73     my $file = shift;
74 dpavlin 8 warn "# unlink_all( $file )\n";
75    
76     my $path = fixup( $file );
77     unlink $path || return 0;
78    
79     my $tmp = $mount->{tmp} . '/' . $file;
80     unlink $tmp if ( -e $tmp );
81    
82 dpavlin 5 delete( $pending->{$file} );
83     return 1;
84     }
85    
86 dpavlin 1 sub x_getattr {
87     my ($file) = fixup(shift);
88     my (@list) = lstat($file);
89     $list[7] = gzip_original_size( $file ) if ( $list[7] && $file =~ m/\.gz$/ );
90     return -$! unless @list;
91     return @list;
92     }
93    
94     sub x_getdir {
95     my ($dirname) = fixup(shift);
96     unless(opendir(DIRHANDLE,$dirname)) {
97     return -ENOENT();
98     }
99     my @files = map { original_name( $_ ) } readdir(DIRHANDLE);
100     closedir(DIRHANDLE);
101     return (@files, 0);
102     }
103    
104     sub file_copy {
105     my ( $s_opt, $s_path, $d_opt, $d_path ) = @_;
106 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;
107 dpavlin 5 open(my $s, $s_opt, $s_path ) || confess "can't open $s_path: $!\npending = ", dump( $pending );
108     open(my $d, $d_opt, $d_path ) || confess "can't open $d_path: $!";
109 dpavlin 1 my $buff;
110     while( read( $s, $buff, 65535 ) ) {
111 dpavlin 5 print $d $buff || confess "can't write into $d_path: $!";
112 dpavlin 13 warn ">> [", length($buff), "] offset ", tell($s), " -> ", tell($d), "\n" if $debug;
113 dpavlin 1 }
114     close($d) || warn "can't close $d_path: $!";
115     close($s) || warn "can't close $s_path: $!";
116 dpavlin 5 warn "-- $s_path [", -s $s_path, "] >>> $d_path [", -s $d_path, "]\n" if $debug;
117     my ($mode,$uid,$gid,$atime,$mtime) = (stat $s_path)[2,4,5,8,9];
118    
119     chmod $mode, $d_path || warn "chmod( $mode $d_path ) failed: $!\n";
120     chown $uid,$gid,$d_path || warn "chown( $uid $gid $d_path ) failed: $!\n";
121     utime $atime,$mtime,$d_path || warn "utime( $atime $mtime $d_path ) failed: $!\n";
122 dpavlin 8
123     undef $d;
124     undef $s;
125 dpavlin 1 }
126    
127     sub x_open {
128     my ($file) = shift;
129     my ($mode) = shift;
130 dpavlin 12
131     if ( $file eq '/.debug' ) {
132     my $path = $mount->{from} . '/.debug';
133     open( my $debug, '>', $path ) || die "can't open $path: $!";
134     my $dump = dump( $pending );
135     print $debug "pending = $dump\n";
136     close($debug);
137     $pending->{'/.debug'}->{path} = $path;
138     warn "## created dump $path $dump\n";
139     return 0;
140     }
141    
142 dpavlin 1 $pending->{$file}->{open}++;
143 dpavlin 8
144     my $mode_desc = {
145     rdonly => $mode && O_RDONLY,
146     rdwr => $mode && O_RDWR,
147     append => $mode && O_APPEND,
148     create => $mode && O_CREAT,
149 dpavlin 14 trunc => $mode && O_TRUNC,
150 dpavlin 8 };
151 dpavlin 14 my $path = fixup($file);
152 dpavlin 19 warn "## open( $file, $mode ) pending: ", $pending->{$file}->{open}, " mode $mode: ", dump( $mode_desc )," $path [", -s $path, "]\n" if $debug;
153 dpavlin 1 my $fh;
154 dpavlin 8
155     my $tmp = $mount->{tmp} . '/' . $file;
156     if ( -e $tmp ) {
157     $path = $tmp;
158     } elsif ( $path =~ m/\.gz$/ ) {
159     my $dest_path = $tmp;
160     $dest_path =~ s!/[^/]+$!!; #!vim-fix
161     mkpath $dest_path unless -e $dest_path;
162     file_copy( '<:gzip', $path, '>', $tmp );
163     $path = $tmp;
164     }
165 dpavlin 19 warn "<<< open abs path: $path [", -e $path ? -s $path : 'new' , "]\n";
166 dpavlin 8 return -$! unless sysopen($fh , $path, $mode);
167 dpavlin 12 close($fh);
168 dpavlin 8
169     $pending->{$file}->{path} = $path;
170 dpavlin 1 return 0;
171     }
172    
173     sub x_read {
174     my ($file,$bufsize,$off) = @_;
175     my ($rv) = -ENOSYS();
176     my $path = fixup( $file );
177 dpavlin 10
178 dpavlin 12 confess "no pending file $file ", dump( $pending ) unless defined( $pending->{$file} );
179    
180 dpavlin 1 return -ENOENT() unless -e $path;
181 dpavlin 10
182     my $fh = new IO::File;
183     return -ENOSYS() unless open($fh,$pending->{$file}->{path});
184    
185 dpavlin 1 if(seek($fh,$off,SEEK_SET)) {
186     read($fh,$rv,$bufsize);
187     }
188 dpavlin 10
189 dpavlin 1 return $rv;
190     }
191    
192     sub x_write {
193     my ($file,$buf,$off) = @_;
194     $pending->{$file}->{write}++;
195 dpavlin 10 my $rv;
196 dpavlin 1 my $path = fixup($file);
197 dpavlin 10
198 dpavlin 12 confess "no pending file $file ", dump( $pending ) unless defined( $pending->{$file} );
199    
200 dpavlin 1 return -ENOENT() unless -e $path;
201 dpavlin 10
202     my $fh = new IO::File;
203     return -ENOSYS() unless open($fh,'+<',$pending->{$file}->{path});
204 dpavlin 1 if($rv = seek( $fh ,$off,SEEK_SET)) {
205     $rv = print( $fh $buf );
206 dpavlin 17 warn "## write ", $pending->{$file}->{path}, " $off ",length( $buf ), "\n" if $debug;
207 dpavlin 1 }
208     $rv = -ENOSYS() unless $rv;
209 dpavlin 12 close($fh);
210 dpavlin 1 return length($buf);
211     }
212    
213     sub err { return (-shift || -$!) }
214    
215     sub x_readlink { return readlink(fixup(shift)); }
216 dpavlin 5 sub x_unlink { return unlink_all( shift ) ? 0 : -$! }
217 dpavlin 1
218     sub x_symlink { return symlink(shift,fixup(shift)) ? 0 : -$!; }
219    
220     sub x_rename {
221 dpavlin 18 my ($old,$new) = @_;
222     my $old_path = fixup($old);
223     my $new_path = fixup($new);
224     $new_path .= '.gz' if ( $old_path =~ m/\.gz$/ && $new_path !~ m/\.gz$/ );
225    
226     my $err = rename($old_path,$new_path) ? 0 : -ENOENT();
227     warn "## rename( $old_path => $new_path ) = $err\n";
228    
229     my $tmp = $mount->{tmp} . '/' . $old;
230     if ( -e $tmp ) {
231     my $new_tmp = $mount->{tmp} . '/' . $new;
232     rename $tmp, $new_tmp || confess "can't rename $tmp -> $new_tmp : $!";
233     }
234    
235 dpavlin 1 return $err;
236     }
237     sub x_link { return link(fixup(shift),fixup(shift)) ? 0 : -$! }
238    
239     sub x_chown {
240     my ($path) = fixup(shift);
241     print "nonexistent $path\n" unless -e $path;
242     my ($uid,$gid) = @_;
243     # perl's chown() does not chown symlinks, it chowns the symlink's
244     # target. it fails when the link's target doesn't exist, because
245     # the stat64() syscall fails.
246     # this causes error messages when unpacking symlinks in tarballs.
247     my ($err) = syscall(&SYS_lchown,$path,$uid,$gid,$path) ? -$! : 0;
248     return $err;
249     }
250    
251     sub x_chmod {
252     my ($path) = fixup(shift);
253     my ($mode) = shift;
254     my ($err) = chmod($mode,$path) ? 0 : -$!;
255     return $err;
256     }
257    
258 dpavlin 14 sub x_truncate {
259     my ( $file,$size ) = @_;
260     my $path = fixup($file);
261     my $rv = truncate( $path, $size ) ? 0 : -$! ;
262     if ( $path =~ m/\.gz$/ ) {
263     my $no_gz = $path;
264     $no_gz =~ s/\.gz$//;
265     rename $path, $no_gz || confess "can't rename $path -> $no_gz: $!";
266     }
267     warn "## truncate( $file $size ) $path [", -s $path, "]\n";
268 dpavlin 15 $pending->{$file}->{write}++;
269 dpavlin 14 return $rv;
270     }
271 dpavlin 1 sub x_utime { return utime($_[1],$_[2],fixup($_[0])) ? 0:-$!; }
272    
273     sub x_mkdir { my ($name, $perm) = @_; return 0 if mkdir(fixup($name),$perm); return -$!; }
274     sub x_rmdir { return 0 if rmdir fixup(shift); return -$!; }
275    
276     sub x_mknod {
277     # since this is called for ALL files, not just devices, I'll do some checks
278     # and possibly run the real mknod command.
279     my ($file, $modes, $dev) = @_;
280     $file = fixup($file);
281     $! = 0;
282     syscall(&SYS_mknod,$file,$modes,$dev);
283     return -$!;
284     }
285    
286     sub x_release {
287     my ( $file, $mode ) = @_;
288     if ( ! defined( $pending->{$file} ) ) {
289     warn "release $file, NO PENDING DATA\n";
290     return 0;
291     } elsif ( ! defined( $pending->{$file}->{write} ) ) {
292     warn "release $file, not written into\n";
293     } elsif ( defined( $pending->{$file}->{open} ) && $pending->{$file}->{open} == 1 ) {
294 dpavlin 5 my $path = $pending->{$file}->{path} || confess "no path for $file ? ", dump( $pending );
295     my $dest = fixup( $file );
296    
297     # cleanup old compressed copy
298     if ( $dest =~ /\.gz$/ ) {
299     warn "## remove old $dest\n";
300 dpavlin 8 unlink $dest || confess "can't remove $dest: $!";
301 dpavlin 5 $dest =~ s/\.gz$//;
302     }
303    
304 dpavlin 1 if ( $file =~ $skip_extensions_regex ) {
305     warn "release $file $mode -- uncompressed\n";
306 dpavlin 5 file_copy( '<', $path, '>', $dest ) if ( $path ne $dest );
307     } elsif ( -s $path < $min_compress_size ) {
308 dpavlin 13 warn "release $file -- uncompressed, too small [", -s $path, "]\n";
309 dpavlin 5 file_copy( '<', $path, '>', $dest ) if ( $path ne $dest );
310 dpavlin 1 } else {
311     warn "release $file $mode -- compressing\n";
312    
313    
314     file_copy( '<', $path, '>:gzip', $dest . '.gz' );
315    
316     # FIXME add timeout to remove uncompressed version?
317 dpavlin 14 # FIXME leave uncompressed file if smaller than compressed
318 dpavlin 8 unlink $path || warn "can't remove $path: $!";
319 dpavlin 1 }
320     } else {
321     warn "release $file, but still used ", $pending->{$file}->{open} , " times, delaying compression\n";
322     }
323 dpavlin 13 $pending->{$file}->{open}--;
324     if ( $pending->{$file}->{open} == 0 ) {
325     warn "## cleanup pending $file [", -s fixup($file), "]\n" if $debug;
326     delete( $pending->{$file} );
327     }
328 dpavlin 1 return 0;
329     }
330    
331     # kludge
332     sub x_statfs {return 255,1000000,500000,1000000,500000,4096}
333     Fuse::main(
334     mountpoint=>$mount->{to},
335     getattr =>"main::x_getattr",
336     readlink=>"main::x_readlink",
337     getdir =>"main::x_getdir",
338     mknod =>"main::x_mknod",
339     mkdir =>"main::x_mkdir",
340     unlink =>"main::x_unlink",
341     rmdir =>"main::x_rmdir",
342     symlink =>"main::x_symlink",
343     rename =>"main::x_rename",
344     link =>"main::x_link",
345     chmod =>"main::x_chmod",
346     chown =>"main::x_chown",
347     truncate=>"main::x_truncate",
348     utime =>"main::x_utime",
349     open =>"main::x_open",
350     read =>"main::x_read",
351     write =>"main::x_write",
352     statfs =>"main::x_statfs",
353     release =>"main::x_release",
354     # threaded=>1,
355     # debug => 1,
356     );

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