/[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 8 - (show annotations)
Sun Jul 8 17:04:18 2007 UTC (12 years, 4 months ago) by dpavlin
File MIME type: text/plain
File size: 8238 byte(s)
fix unlink to actually work, decode open mode
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
15 my $mount = {
16 from => '/tmp/comp',
17 to => '/tmp/no-comp',
18 tmp => '/dev/shm/comp',
19 };
20
21 my $debug = 1;
22
23 my $skip_extensions_regex = qr/\.(?:sw[a-z]|gif|png|jpeg|jpg|avi|rar|zip|bz2|gz|tgz|avi|mpeg|mpg|tmp|temp)$/i;
24
25 # don't compress files smaller than this
26 my $min_compress_size = 512;
27
28 foreach my $dir ( keys %$mount ) {
29 if ( ! -e $mount->{$dir} ) {
30 warn "created $mount->{$dir}\n";
31 mkdir $mount->{$dir} || die "can't create $mount->{$dir}: $!";
32 }
33 }
34
35 my $pending;
36
37 sub fixup {
38 my ( $path ) = @_;
39 my $full = $mount->{from} . '/' . $path;
40 if ( -e $full . '.gz' ) {
41 return $full . '.gz';
42 }
43 return $full;
44 }
45
46 sub original_name {
47 my $p = shift;
48 $p =~ s/\.gz$//;
49 return $p;
50 };
51
52 sub gzip_original_size {
53 my $file = shift;
54
55 return unless -e $file;
56
57 my $buff;
58
59 open(my $fh, $file) || die "can't open $file: $!";
60
61 # read($fh, $buff, 10 );
62 # print dump( unpack("nccVcc", $buff ) );
63
64 seek($fh, -4, 2);
65 read($fh, $buff, 4 );
66 close($fh);
67
68 return unpack("L", $buff);
69 }
70
71 sub unlink_all {
72 my $file = shift;
73 warn "# unlink_all( $file )\n";
74
75 my $path = fixup( $file );
76 unlink $path || return 0;
77
78 my $tmp = $mount->{tmp} . '/' . $file;
79 unlink $tmp if ( -e $tmp );
80
81 delete( $pending->{$file} );
82 return 1;
83 }
84
85 sub x_getattr {
86 my ($file) = fixup(shift);
87 my (@list) = lstat($file);
88 $list[7] = gzip_original_size( $file ) if ( $list[7] && $file =~ m/\.gz$/ );
89 return -$! unless @list;
90 return @list;
91 }
92
93 sub x_getdir {
94 my ($dirname) = fixup(shift);
95 unless(opendir(DIRHANDLE,$dirname)) {
96 return -ENOENT();
97 }
98 my @files = map { original_name( $_ ) } readdir(DIRHANDLE);
99 closedir(DIRHANDLE);
100 return (@files, 0);
101 }
102
103 sub file_copy {
104 my ( $s_opt, $s_path, $d_opt, $d_path ) = @_;
105 warn "## file_copy( $s_opt $s_path $d_opt $d_path )\n";
106 open(my $s, $s_opt, $s_path ) || confess "can't open $s_path: $!\npending = ", dump( $pending );
107 open(my $d, $d_opt, $d_path ) || confess "can't open $d_path: $!";
108 my $buff;
109 while( read( $s, $buff, 65535 ) ) {
110 print $d $buff || confess "can't write into $d_path: $!";
111 warn ">> ", length($buff), " bytes, offset ", tell($s), " -> ", tell($d), "\n" if $debug;
112 }
113 close($d) || warn "can't close $d_path: $!";
114 close($s) || warn "can't close $s_path: $!";
115 warn "-- $s_path [", -s $s_path, "] >>> $d_path [", -s $d_path, "]\n" if $debug;
116 my ($mode,$uid,$gid,$atime,$mtime) = (stat $s_path)[2,4,5,8,9];
117
118 chmod $mode, $d_path || warn "chmod( $mode $d_path ) failed: $!\n";
119 chown $uid,$gid,$d_path || warn "chown( $uid $gid $d_path ) failed: $!\n";
120 utime $atime,$mtime,$d_path || warn "utime( $atime $mtime $d_path ) failed: $!\n";
121
122 undef $d;
123 undef $s;
124 }
125
126 sub x_open {
127 my ($file) = shift;
128 my ($mode) = shift;
129 $pending->{$file}->{open}++;
130
131 my $mode_desc = {
132 rdonly => $mode && O_RDONLY,
133 rdwr => $mode && O_RDWR,
134 append => $mode && O_APPEND,
135 create => $mode && O_CREAT,
136 };
137 warn "# open( $file, $mode ) pending: ", $pending->{$file}->{open}, " mode: ", dump( $mode_desc ),"\n";
138 my $fh;
139
140 my $path = fixup($file);
141 my $tmp = $mount->{tmp} . '/' . $file;
142 if ( -e $tmp ) {
143 $path = $tmp;
144 } elsif ( $path =~ m/\.gz$/ ) {
145 my $dest_path = $tmp;
146 $dest_path =~ s!/[^/]+$!!; #!vim-fix
147 mkpath $dest_path unless -e $dest_path;
148 file_copy( '<:gzip', $path, '>', $tmp );
149 $path = $tmp;
150 }
151 warn ">>> open abs path: $path ", -s $path, " bytes\n";
152 return -$! unless sysopen($fh , $path, $mode);
153
154 $pending->{$file}->{fh} = $fh;
155 $pending->{$file}->{path} = $path;
156 $pending->{$file}->{mode} = {
157 rdonly => $mode && O_RDONLY,
158 rdwr => $mode && O_RDWR,
159 append => $mode && O_APPEND,
160 create => $mode && O_CREAT,
161 };
162 return 0;
163 }
164
165 sub x_read {
166 my ($file,$bufsize,$off) = @_;
167 my ($rv) = -ENOSYS();
168 my $path = fixup( $file );
169 return -ENOENT() unless -e $path;
170 my ($fsize) = -s $path;
171 my $fh = $pending->{$file}->{fh} || confess "no fh? ", dump( $pending );
172 if(seek($fh,$off,SEEK_SET)) {
173 read($fh,$rv,$bufsize);
174 }
175 return $rv;
176 }
177
178 sub x_write {
179 my ($file,$buf,$off) = @_;
180 $pending->{$file}->{write}++;
181 my ($rv);
182 my $path = fixup($file);
183 return -ENOENT() unless -e $path;
184 my ($fsize) = -s $path;
185 my $fh = $pending->{$file}->{fh};
186 return -ENOSYS() unless $fh;
187 if($rv = seek( $fh ,$off,SEEK_SET)) {
188 $rv = print( $fh $buf );
189 }
190 $rv = -ENOSYS() unless $rv;
191 return length($buf);
192 }
193
194 sub err { return (-shift || -$!) }
195
196 sub x_readlink { return readlink(fixup(shift)); }
197 sub x_unlink { return unlink_all( shift ) ? 0 : -$! }
198
199 sub x_symlink { return symlink(shift,fixup(shift)) ? 0 : -$!; }
200
201 sub x_rename {
202 my ($old) = fixup(shift);
203 my ($new) = fixup(shift);
204 my ($err) = rename($old,$new) ? 0 : -ENOENT();
205 return $err;
206 }
207 sub x_link { return link(fixup(shift),fixup(shift)) ? 0 : -$! }
208
209 sub x_chown {
210 my ($path) = fixup(shift);
211 print "nonexistent $path\n" unless -e $path;
212 my ($uid,$gid) = @_;
213 # perl's chown() does not chown symlinks, it chowns the symlink's
214 # target. it fails when the link's target doesn't exist, because
215 # the stat64() syscall fails.
216 # this causes error messages when unpacking symlinks in tarballs.
217 my ($err) = syscall(&SYS_lchown,$path,$uid,$gid,$path) ? -$! : 0;
218 return $err;
219 }
220
221 sub x_chmod {
222 my ($path) = fixup(shift);
223 my ($mode) = shift;
224 my ($err) = chmod($mode,$path) ? 0 : -$!;
225 return $err;
226 }
227
228 sub x_truncate { return truncate(fixup(shift),shift) ? 0 : -$! ; }
229 sub x_utime { return utime($_[1],$_[2],fixup($_[0])) ? 0:-$!; }
230
231 sub x_mkdir { my ($name, $perm) = @_; return 0 if mkdir(fixup($name),$perm); return -$!; }
232 sub x_rmdir { return 0 if rmdir fixup(shift); return -$!; }
233
234 sub x_mknod {
235 # since this is called for ALL files, not just devices, I'll do some checks
236 # and possibly run the real mknod command.
237 my ($file, $modes, $dev) = @_;
238 $file = fixup($file);
239 $! = 0;
240 syscall(&SYS_mknod,$file,$modes,$dev);
241 return -$!;
242 }
243
244 sub x_release {
245 my ( $file, $mode ) = @_;
246 if ( ! defined( $pending->{$file} ) ) {
247 warn "release $file, NO PENDING DATA\n";
248 return 0;
249 } elsif ( ! defined( $pending->{$file}->{write} ) ) {
250 warn "release $file, not written into\n";
251 } elsif ( defined( $pending->{$file}->{open} ) && $pending->{$file}->{open} == 1 ) {
252 close( $pending->{$file}->{fh} ) || warn "can't close $file: $!";
253 my $path = $pending->{$file}->{path} || confess "no path for $file ? ", dump( $pending );
254 my $dest = fixup( $file );
255
256 # cleanup old compressed copy
257 if ( $dest =~ /\.gz$/ ) {
258 warn "## remove old $dest\n";
259 unlink $dest || confess "can't remove $dest: $!";
260 $dest =~ s/\.gz$//;
261 }
262
263 if ( $file =~ $skip_extensions_regex ) {
264 warn "release $file $mode -- uncompressed\n";
265 file_copy( '<', $path, '>', $dest ) if ( $path ne $dest );
266 } elsif ( -s $path < $min_compress_size ) {
267 warn "release $file -- uncompressed, too small ", -s $path, " bytes\n";
268 file_copy( '<', $path, '>', $dest ) if ( $path ne $dest );
269 } else {
270 warn "release $file $mode -- compressing\n";
271
272
273 file_copy( '<', $path, '>:gzip', $dest . '.gz' );
274
275 # FIXME add timeout to remove uncompressed version?
276 unlink $path || warn "can't remove $path: $!";
277 }
278 } else {
279 warn "release $file, but still used ", $pending->{$file}->{open} , " times, delaying compression\n";
280 $pending->{$file}->{open}--;
281 return 0;
282 }
283 delete( $pending->{$file} );
284 return 0;
285 }
286
287 # kludge
288 sub x_statfs {return 255,1000000,500000,1000000,500000,4096}
289 Fuse::main(
290 mountpoint=>$mount->{to},
291 getattr =>"main::x_getattr",
292 readlink=>"main::x_readlink",
293 getdir =>"main::x_getdir",
294 mknod =>"main::x_mknod",
295 mkdir =>"main::x_mkdir",
296 unlink =>"main::x_unlink",
297 rmdir =>"main::x_rmdir",
298 symlink =>"main::x_symlink",
299 rename =>"main::x_rename",
300 link =>"main::x_link",
301 chmod =>"main::x_chmod",
302 chown =>"main::x_chown",
303 truncate=>"main::x_truncate",
304 utime =>"main::x_utime",
305 open =>"main::x_open",
306 read =>"main::x_read",
307 write =>"main::x_write",
308 statfs =>"main::x_statfs",
309 release =>"main::x_release",
310 # threaded=>1,
311 # debug => 1,
312 );

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