/[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 15 - (hide annotations)
Mon Jul 9 13:33:13 2007 UTC (12 years, 5 months ago) by dpavlin
File MIME type: text/plain
File size: 9220 byte(s)
add a lot of harness tests, and make truncate flag file write
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     my $debug = 1;
23    
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 13 warn "## file_copy( $s_opt $s_path [",-s $s_path,"] $d_opt $d_path [",-e $d_path ? -s $d_path : 'new',"])\n";
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     warn "# open( $file, $mode ) pending: ", $pending->{$file}->{open}, " mode $mode: ", dump( $mode_desc )," $path [", -s $path, "]\n";
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 14 warn ">>> open abs path: $path [", -e $path ? -s $path : 'new' , "]\n";
166 dpavlin 8 return -$! unless sysopen($fh , $path, $mode);
167 dpavlin 14 warn ">>> after open [",-s $path, "]\n";
168 dpavlin 12 close($fh);
169 dpavlin 8
170     $pending->{$file}->{path} = $path;
171 dpavlin 1 return 0;
172     }
173    
174     sub x_read {
175     my ($file,$bufsize,$off) = @_;
176     my ($rv) = -ENOSYS();
177     my $path = fixup( $file );
178 dpavlin 10
179 dpavlin 12 confess "no pending file $file ", dump( $pending ) unless defined( $pending->{$file} );
180    
181 dpavlin 1 return -ENOENT() unless -e $path;
182 dpavlin 10
183     my $fh = new IO::File;
184     return -ENOSYS() unless open($fh,$pending->{$file}->{path});
185    
186 dpavlin 1 if(seek($fh,$off,SEEK_SET)) {
187     read($fh,$rv,$bufsize);
188     }
189 dpavlin 10
190 dpavlin 1 return $rv;
191     }
192    
193     sub x_write {
194     my ($file,$buf,$off) = @_;
195     $pending->{$file}->{write}++;
196 dpavlin 10 my $rv;
197 dpavlin 1 my $path = fixup($file);
198 dpavlin 10
199 dpavlin 12 confess "no pending file $file ", dump( $pending ) unless defined( $pending->{$file} );
200    
201 dpavlin 1 return -ENOENT() unless -e $path;
202 dpavlin 10
203     my $fh = new IO::File;
204     return -ENOSYS() unless open($fh,'+<',$pending->{$file}->{path});
205 dpavlin 1 if($rv = seek( $fh ,$off,SEEK_SET)) {
206     $rv = print( $fh $buf );
207 dpavlin 10 warn "## ", $pending->{$file}->{path}, " $off ",length( $buf ), "\n" if $debug;
208 dpavlin 1 }
209     $rv = -ENOSYS() unless $rv;
210 dpavlin 12 close($fh);
211 dpavlin 1 return length($buf);
212     }
213    
214     sub err { return (-shift || -$!) }
215    
216     sub x_readlink { return readlink(fixup(shift)); }
217 dpavlin 5 sub x_unlink { return unlink_all( shift ) ? 0 : -$! }
218 dpavlin 1
219     sub x_symlink { return symlink(shift,fixup(shift)) ? 0 : -$!; }
220    
221     sub x_rename {
222     my ($old) = fixup(shift);
223     my ($new) = fixup(shift);
224     my ($err) = rename($old,$new) ? 0 : -ENOENT();
225     return $err;
226     }
227     sub x_link { return link(fixup(shift),fixup(shift)) ? 0 : -$! }
228    
229     sub x_chown {
230     my ($path) = fixup(shift);
231     print "nonexistent $path\n" unless -e $path;
232     my ($uid,$gid) = @_;
233     # perl's chown() does not chown symlinks, it chowns the symlink's
234     # target. it fails when the link's target doesn't exist, because
235     # the stat64() syscall fails.
236     # this causes error messages when unpacking symlinks in tarballs.
237     my ($err) = syscall(&SYS_lchown,$path,$uid,$gid,$path) ? -$! : 0;
238     return $err;
239     }
240    
241     sub x_chmod {
242     my ($path) = fixup(shift);
243     my ($mode) = shift;
244     my ($err) = chmod($mode,$path) ? 0 : -$!;
245     return $err;
246     }
247    
248 dpavlin 14 sub x_truncate {
249     my ( $file,$size ) = @_;
250     my $path = fixup($file);
251     my $rv = truncate( $path, $size ) ? 0 : -$! ;
252     if ( $path =~ m/\.gz$/ ) {
253     my $no_gz = $path;
254     $no_gz =~ s/\.gz$//;
255     rename $path, $no_gz || confess "can't rename $path -> $no_gz: $!";
256     }
257     warn "## truncate( $file $size ) $path [", -s $path, "]\n";
258 dpavlin 15 $pending->{$file}->{write}++;
259 dpavlin 14 return $rv;
260     }
261 dpavlin 1 sub x_utime { return utime($_[1],$_[2],fixup($_[0])) ? 0:-$!; }
262    
263     sub x_mkdir { my ($name, $perm) = @_; return 0 if mkdir(fixup($name),$perm); return -$!; }
264     sub x_rmdir { return 0 if rmdir fixup(shift); return -$!; }
265    
266     sub x_mknod {
267     # since this is called for ALL files, not just devices, I'll do some checks
268     # and possibly run the real mknod command.
269     my ($file, $modes, $dev) = @_;
270     $file = fixup($file);
271     $! = 0;
272     syscall(&SYS_mknod,$file,$modes,$dev);
273     return -$!;
274     }
275    
276     sub x_release {
277     my ( $file, $mode ) = @_;
278     if ( ! defined( $pending->{$file} ) ) {
279     warn "release $file, NO PENDING DATA\n";
280     return 0;
281     } elsif ( ! defined( $pending->{$file}->{write} ) ) {
282     warn "release $file, not written into\n";
283     } elsif ( defined( $pending->{$file}->{open} ) && $pending->{$file}->{open} == 1 ) {
284 dpavlin 5 my $path = $pending->{$file}->{path} || confess "no path for $file ? ", dump( $pending );
285     my $dest = fixup( $file );
286    
287     # cleanup old compressed copy
288     if ( $dest =~ /\.gz$/ ) {
289     warn "## remove old $dest\n";
290 dpavlin 8 unlink $dest || confess "can't remove $dest: $!";
291 dpavlin 5 $dest =~ s/\.gz$//;
292     }
293    
294 dpavlin 1 if ( $file =~ $skip_extensions_regex ) {
295     warn "release $file $mode -- uncompressed\n";
296 dpavlin 5 file_copy( '<', $path, '>', $dest ) if ( $path ne $dest );
297     } elsif ( -s $path < $min_compress_size ) {
298 dpavlin 13 warn "release $file -- uncompressed, too small [", -s $path, "]\n";
299 dpavlin 5 file_copy( '<', $path, '>', $dest ) if ( $path ne $dest );
300 dpavlin 1 } else {
301     warn "release $file $mode -- compressing\n";
302    
303    
304     file_copy( '<', $path, '>:gzip', $dest . '.gz' );
305    
306     # FIXME add timeout to remove uncompressed version?
307 dpavlin 14 # FIXME leave uncompressed file if smaller than compressed
308 dpavlin 8 unlink $path || warn "can't remove $path: $!";
309 dpavlin 1 }
310     } else {
311     warn "release $file, but still used ", $pending->{$file}->{open} , " times, delaying compression\n";
312     }
313 dpavlin 13 $pending->{$file}->{open}--;
314     if ( $pending->{$file}->{open} == 0 ) {
315     warn "## cleanup pending $file [", -s fixup($file), "]\n" if $debug;
316     delete( $pending->{$file} );
317     }
318 dpavlin 1 return 0;
319     }
320    
321     # kludge
322     sub x_statfs {return 255,1000000,500000,1000000,500000,4096}
323     Fuse::main(
324     mountpoint=>$mount->{to},
325     getattr =>"main::x_getattr",
326     readlink=>"main::x_readlink",
327     getdir =>"main::x_getdir",
328     mknod =>"main::x_mknod",
329     mkdir =>"main::x_mkdir",
330     unlink =>"main::x_unlink",
331     rmdir =>"main::x_rmdir",
332     symlink =>"main::x_symlink",
333     rename =>"main::x_rename",
334     link =>"main::x_link",
335     chmod =>"main::x_chmod",
336     chown =>"main::x_chown",
337     truncate=>"main::x_truncate",
338     utime =>"main::x_utime",
339     open =>"main::x_open",
340     read =>"main::x_read",
341     write =>"main::x_write",
342     statfs =>"main::x_statfs",
343     release =>"main::x_release",
344     # threaded=>1,
345     # debug => 1,
346     );

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