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 = shift @ARGV; |
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" if $debug; |
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" if $debug; |
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 = $tmp; |
164 |
} |
165 |
|
166 |
if ( sysopen($fh , $path, $mode) ) { |
167 |
close($fh) || confess "can't close $path: $!"; |
168 |
warn "<<< open $path [", -e $path ? -s $path : 'new' , "]\n"; |
169 |
$pending->{$file}->{path} = $path; |
170 |
return 0; |
171 |
} else { |
172 |
warn "ERROR: can't open $path : $!"; |
173 |
return -$!; |
174 |
} |
175 |
|
176 |
} |
177 |
|
178 |
sub x_read { |
179 |
my ($file,$bufsize,$off) = @_; |
180 |
my ($rv) = -ENOSYS(); |
181 |
my $path = fixup( $file ); |
182 |
|
183 |
confess "no pending file $file ", dump( $pending ) unless defined( $pending->{$file} ); |
184 |
|
185 |
return -ENOENT() unless -e $path; |
186 |
|
187 |
my $fh = new IO::File; |
188 |
return -ENOSYS() unless open($fh,$pending->{$file}->{path}); |
189 |
|
190 |
if(seek($fh,$off,SEEK_SET)) { |
191 |
read($fh,$rv,$bufsize); |
192 |
} |
193 |
|
194 |
return $rv; |
195 |
} |
196 |
|
197 |
sub x_write { |
198 |
my ($file,$buf,$off) = @_; |
199 |
$pending->{$file}->{write}++; |
200 |
my $rv; |
201 |
my $path = fixup($file); |
202 |
|
203 |
confess "no pending file $file ", dump( $pending ) unless defined( $pending->{$file} ); |
204 |
|
205 |
return -ENOENT() unless -e $path; |
206 |
|
207 |
my $fh = new IO::File; |
208 |
return -ENOSYS() unless open($fh,'+<',$pending->{$file}->{path}); |
209 |
if($rv = seek( $fh ,$off,SEEK_SET)) { |
210 |
$rv = print( $fh $buf ); |
211 |
warn "## write ", $pending->{$file}->{path}, " $off ",length( $buf ), "\n" if $debug; |
212 |
} |
213 |
$rv = -ENOSYS() unless $rv; |
214 |
close($fh); |
215 |
return length($buf); |
216 |
} |
217 |
|
218 |
sub err { return (-shift || -$!) } |
219 |
|
220 |
sub x_readlink { return readlink(fixup(shift)); } |
221 |
sub x_unlink { return unlink_all( shift ) ? 0 : -$! } |
222 |
|
223 |
sub x_symlink { return symlink(shift,fixup(shift)) ? 0 : -$!; } |
224 |
|
225 |
sub x_rename { |
226 |
my ($old,$new) = @_; |
227 |
my $old_path = fixup($old); |
228 |
my $new_path = fixup($new); |
229 |
$new_path .= '.gz' if ( $old_path =~ m/\.gz$/ && $new_path !~ m/\.gz$/ ); |
230 |
|
231 |
my $err = rename($old_path,$new_path) ? 0 : -ENOENT(); |
232 |
warn "## rename( $old_path => $new_path ) = $err\n"; |
233 |
|
234 |
my $tmp = $mount->{tmp} . '/' . $old; |
235 |
if ( -e $tmp ) { |
236 |
my $new_tmp = $mount->{tmp} . '/' . $new; |
237 |
rename $tmp, $new_tmp || confess "can't rename $tmp -> $new_tmp : $!"; |
238 |
} |
239 |
|
240 |
if (defined( $pending->{$old} )) { |
241 |
$pending->{$new} = $pending->{$old}; |
242 |
|
243 |
my $path = $pending->{$old}->{path}; |
244 |
$path =~ s/\Q$old\E/$new/; |
245 |
$pending->{$new}->{path} = $path; |
246 |
|
247 |
delete( $pending->{$old} ); |
248 |
} |
249 |
|
250 |
return $err; |
251 |
} |
252 |
sub x_link { return link(fixup(shift),fixup(shift)) ? 0 : -$! } |
253 |
|
254 |
sub x_chown { |
255 |
my ($path) = fixup(shift); |
256 |
print "nonexistent $path\n" unless -e $path; |
257 |
my ($uid,$gid) = @_; |
258 |
# perl's chown() does not chown symlinks, it chowns the symlink's |
259 |
# target. it fails when the link's target doesn't exist, because |
260 |
# the stat64() syscall fails. |
261 |
# this causes error messages when unpacking symlinks in tarballs. |
262 |
my ($err) = syscall(&SYS_lchown,$path,$uid,$gid,$path) ? -$! : 0; |
263 |
return $err; |
264 |
} |
265 |
|
266 |
sub x_chmod { |
267 |
my ($path) = fixup(shift); |
268 |
my ($mode) = shift; |
269 |
my ($err) = chmod($mode,$path) ? 0 : -$!; |
270 |
return $err; |
271 |
} |
272 |
|
273 |
sub x_truncate { |
274 |
my ( $file,$size ) = @_; |
275 |
my $path = fixup($file); |
276 |
my $rv = truncate( $path, $size ) ? 0 : -$! ; |
277 |
if ( $path =~ m/\.gz$/ ) { |
278 |
my $no_gz = $path; |
279 |
$no_gz =~ s/\.gz$//; |
280 |
rename $path, $no_gz || confess "can't rename $path -> $no_gz: $!"; |
281 |
} |
282 |
warn "## truncate( $file $size ) $path [", -s $path, "] = $rv\n" if $debug; |
283 |
$pending->{$file}->{write}++; |
284 |
return $rv; |
285 |
} |
286 |
sub x_utime { return utime($_[1],$_[2],fixup($_[0])) ? 0:-$!; } |
287 |
|
288 |
sub x_mkdir { my ($name, $perm) = @_; return 0 if mkdir(fixup($name),$perm); return -$!; } |
289 |
sub x_rmdir { return 0 if rmdir fixup(shift); return -$!; } |
290 |
|
291 |
sub x_mknod { |
292 |
# since this is called for ALL files, not just devices, I'll do some checks |
293 |
# and possibly run the real mknod command. |
294 |
my ($file, $modes, $dev) = @_; |
295 |
$file = fixup($file); |
296 |
$! = 0; |
297 |
syscall(&SYS_mknod,$file,$modes,$dev); |
298 |
return -$!; |
299 |
} |
300 |
|
301 |
sub x_release { |
302 |
my ( $file, $mode ) = @_; |
303 |
if ( ! defined( $pending->{$file} ) ) { |
304 |
warn "release $file, NO PENDING DATA\n"; |
305 |
return 0; |
306 |
} elsif ( ! defined( $pending->{$file}->{write} ) ) { |
307 |
warn "release $file, not written into\n"; |
308 |
} elsif ( defined( $pending->{$file}->{open} ) && $pending->{$file}->{open} == 1 ) { |
309 |
my $path = $pending->{$file}->{path} || confess "no path for $file ? ", dump( $pending ); |
310 |
my $dest = fixup( $file ); |
311 |
|
312 |
# cleanup old compressed copy |
313 |
if ( $dest =~ /\.gz$/ ) { |
314 |
warn "## remove old $dest\n"; |
315 |
unlink $dest || confess "can't remove $dest: $!"; |
316 |
$dest =~ s/\.gz$//; |
317 |
} |
318 |
|
319 |
if ( $file =~ $skip_extensions_regex ) { |
320 |
warn "release $file [",-s $path,"] skipped compression\n"; |
321 |
file_copy( '<', $path, '>', $dest ) if ( $path ne $dest ); |
322 |
} elsif ( -s $path < $min_compress_size ) { |
323 |
warn "release $file [",-s $path,"] uncompressed, too small\n"; |
324 |
file_copy( '<', $path, '>', $dest ) if ( $path ne $dest ); |
325 |
} else { |
326 |
warn "release $file [",-s $path,"] compressing\n"; |
327 |
|
328 |
my $comp = $dest . '.gz'; |
329 |
file_copy( '<', $path, '>:gzip', $comp ); |
330 |
|
331 |
my ( $size_path, $size_comp ) = ( -s $path, -s $comp ); |
332 |
|
333 |
if ( $size_path <= $size_comp ) { |
334 |
warn ">>> $size_path <= $size_comp leaving uncompressed\n"; |
335 |
unlink $comp || warn "can't reamove: $comp: $!"; |
336 |
} else { |
337 |
warn ">>> compressed $size_path -> $size_comp ",int(($size_comp * 100) / $size_path),"%\n"; |
338 |
# FIXME add timeout to remove uncompressed version? |
339 |
unlink $path || warn "can't remove $path: $!"; |
340 |
} |
341 |
} |
342 |
} else { |
343 |
warn "release $file, but still used ", $pending->{$file}->{open} , " times, delaying compression\n"; |
344 |
} |
345 |
$pending->{$file}->{open}--; |
346 |
if ( $pending->{$file}->{open} == 0 ) { |
347 |
warn "## cleanup pending $file [", -s fixup($file), "]\n" if $debug; |
348 |
delete( $pending->{$file} ); |
349 |
} |
350 |
return 0; |
351 |
} |
352 |
|
353 |
# kludge |
354 |
sub x_statfs {return 255,1000000,500000,1000000,500000,4096} |
355 |
Fuse::main( |
356 |
mountpoint=>$mount->{to}, |
357 |
getattr =>"main::x_getattr", |
358 |
readlink=>"main::x_readlink", |
359 |
getdir =>"main::x_getdir", |
360 |
mknod =>"main::x_mknod", |
361 |
mkdir =>"main::x_mkdir", |
362 |
unlink =>"main::x_unlink", |
363 |
rmdir =>"main::x_rmdir", |
364 |
symlink =>"main::x_symlink", |
365 |
rename =>"main::x_rename", |
366 |
link =>"main::x_link", |
367 |
chmod =>"main::x_chmod", |
368 |
chown =>"main::x_chown", |
369 |
truncate=>"main::x_truncate", |
370 |
utime =>"main::x_utime", |
371 |
open =>"main::x_open", |
372 |
read =>"main::x_read", |
373 |
write =>"main::x_write", |
374 |
statfs =>"main::x_statfs", |
375 |
release =>"main::x_release", |
376 |
# threaded=>1, |
377 |
# debug => 1, |
378 |
); |