/[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 15 - (show 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 #!/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
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 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
26 # don't compress files smaller than this
27 my $min_compress_size = 512;
28
29 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 sub unlink_all {
73 my $file = shift;
74 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 delete( $pending->{$file} );
83 return 1;
84 }
85
86 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 warn "## file_copy( $s_opt $s_path [",-s $s_path,"] $d_opt $d_path [",-e $d_path ? -s $d_path : 'new',"])\n";
107 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 my $buff;
110 while( read( $s, $buff, 65535 ) ) {
111 print $d $buff || confess "can't write into $d_path: $!";
112 warn ">> [", length($buff), "] offset ", tell($s), " -> ", tell($d), "\n" if $debug;
113 }
114 close($d) || warn "can't close $d_path: $!";
115 close($s) || warn "can't close $s_path: $!";
116 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
123 undef $d;
124 undef $s;
125 }
126
127 sub x_open {
128 my ($file) = shift;
129 my ($mode) = shift;
130
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 $pending->{$file}->{open}++;
143
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 trunc => $mode && O_TRUNC,
150 };
151 my $path = fixup($file);
152 warn "# open( $file, $mode ) pending: ", $pending->{$file}->{open}, " mode $mode: ", dump( $mode_desc )," $path [", -s $path, "]\n";
153 my $fh;
154
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 warn ">>> open abs path: $path [", -e $path ? -s $path : 'new' , "]\n";
166 return -$! unless sysopen($fh , $path, $mode);
167 warn ">>> after open [",-s $path, "]\n";
168 close($fh);
169
170 $pending->{$file}->{path} = $path;
171 return 0;
172 }
173
174 sub x_read {
175 my ($file,$bufsize,$off) = @_;
176 my ($rv) = -ENOSYS();
177 my $path = fixup( $file );
178
179 confess "no pending file $file ", dump( $pending ) unless defined( $pending->{$file} );
180
181 return -ENOENT() unless -e $path;
182
183 my $fh = new IO::File;
184 return -ENOSYS() unless open($fh,$pending->{$file}->{path});
185
186 if(seek($fh,$off,SEEK_SET)) {
187 read($fh,$rv,$bufsize);
188 }
189
190 return $rv;
191 }
192
193 sub x_write {
194 my ($file,$buf,$off) = @_;
195 $pending->{$file}->{write}++;
196 my $rv;
197 my $path = fixup($file);
198
199 confess "no pending file $file ", dump( $pending ) unless defined( $pending->{$file} );
200
201 return -ENOENT() unless -e $path;
202
203 my $fh = new IO::File;
204 return -ENOSYS() unless open($fh,'+<',$pending->{$file}->{path});
205 if($rv = seek( $fh ,$off,SEEK_SET)) {
206 $rv = print( $fh $buf );
207 warn "## ", $pending->{$file}->{path}, " $off ",length( $buf ), "\n" if $debug;
208 }
209 $rv = -ENOSYS() unless $rv;
210 close($fh);
211 return length($buf);
212 }
213
214 sub err { return (-shift || -$!) }
215
216 sub x_readlink { return readlink(fixup(shift)); }
217 sub x_unlink { return unlink_all( shift ) ? 0 : -$! }
218
219 sub x_symlink { return symlink(shift,fixup(shift)) ? 0 : -$!; }
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 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 $pending->{$file}->{write}++;
259 return $rv;
260 }
261 sub x_utime { return utime($_[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 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 unlink $dest || confess "can't remove $dest: $!";
291 $dest =~ s/\.gz$//;
292 }
293
294 if ( $file =~ $skip_extensions_regex ) {
295 warn "release $file $mode -- uncompressed\n";
296 file_copy( '<', $path, '>', $dest ) if ( $path ne $dest );
297 } elsif ( -s $path < $min_compress_size ) {
298 warn "release $file -- uncompressed, too small [", -s $path, "]\n";
299 file_copy( '<', $path, '>', $dest ) if ( $path ne $dest );
300 } 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 # FIXME leave uncompressed file if smaller than compressed
308 unlink $path || warn "can't remove $path: $!";
309 }
310 } else {
311 warn "release $file, but still used ", $pending->{$file}->{open} , " times, delaying compression\n";
312 }
313 $pending->{$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 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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