/[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 4 - (show annotations)
Sun Jul 8 13:46:33 2007 UTC (12 years, 5 months ago) by dpavlin
File MIME type: text/plain
File size: 7014 byte(s)
report size of files in file_copy, exclude all .sw*
1 #!/usr/bin/perl -w
2 use strict;
3 use threads;
4 use threads::shared;
5
6 use Fuse;
7 use IO::File;
8 use POSIX qw(ENOENT ENOSYS EEXIST EPERM O_RDONLY O_RDWR O_APPEND O_CREAT);
9 use Fcntl qw(S_ISBLK S_ISCHR S_ISFIFO SEEK_SET);
10 require 'syscall.ph'; # for SYS_mknod and SYS_lchown
11 use PerlIO::gzip;
12 use File::Path;
13 use Data::Dump qw/dump/;
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 foreach my $dir ( keys %$mount ) {
26 if ( ! -e $mount->{$dir} ) {
27 warn "created $mount->{$dir}\n";
28 mkdir $mount->{$dir} || die "can't create $mount->{$dir}: $!";
29 }
30 }
31
32 my $pending;
33
34 sub fixup {
35 my ( $path ) = @_;
36 my $full = $mount->{from} . '/' . $path;
37 if ( -e $full . '.gz' ) {
38 return $full . '.gz';
39 }
40 return $full;
41 }
42
43 sub original_name {
44 my $p = shift;
45 $p =~ s/\.gz$//;
46 return $p;
47 };
48
49 sub gzip_original_size {
50 my $file = shift;
51
52 return unless -e $file;
53
54 my $buff;
55
56 open(my $fh, $file) || die "can't open $file: $!";
57
58 # read($fh, $buff, 10 );
59 # print dump( unpack("nccVcc", $buff ) );
60
61 seek($fh, -4, 2);
62 read($fh, $buff, 4 );
63 close($fh);
64
65 return unpack("L", $buff);
66 }
67
68 sub x_getattr {
69 my ($file) = fixup(shift);
70 my (@list) = lstat($file);
71 $list[7] = gzip_original_size( $file ) if ( $list[7] && $file =~ m/\.gz$/ );
72 return -$! unless @list;
73 return @list;
74 }
75
76 sub x_getdir {
77 my ($dirname) = fixup(shift);
78 unless(opendir(DIRHANDLE,$dirname)) {
79 return -ENOENT();
80 }
81 my @files = map { original_name( $_ ) } readdir(DIRHANDLE);
82 closedir(DIRHANDLE);
83 return (@files, 0);
84 }
85
86 sub file_copy {
87 my ( $s_opt, $s_path, $d_opt, $d_path ) = @_;
88 warn "## file_copy( $s_opt $s_path $d_opt $d_path )\n";
89 open(my $s, $s_opt, $s_path ) || die "can't open $s_path: $!";
90 open(my $d, $d_opt, $d_path ) || die "can't open $d_path: $!";
91 my $buff;
92 while( read( $s, $buff, 65535 ) ) {
93 print $d $buff || die "can't write into $d_path: $!";
94 warn ">> ", length($buff), " bytes, offset ", tell($s), " -> ", tell($d), "\n" if $debug;
95 }
96 close($d) || warn "can't close $d_path: $!";
97 close($s) || warn "can't close $s_path: $!";
98 warn "-- $s_path [", -s $s_path, "]\n >>> $d_path [", -s $d_path, "]\n" if $debug;
99 }
100
101 sub x_open {
102 my ($file) = shift;
103 my ($mode) = shift;
104 $pending->{$file}->{open}++;
105 my $fh;
106 if ( $pending->{$file}->{open} == 1 ) {
107 warn "# open( $file, $mode )\n";
108 my $path = fixup($file);
109 my $tmp = $mount->{tmp} . '/' . $file;
110 if ( -e $tmp ) {
111 $path = $tmp;
112 } elsif ( $path =~ m/\.gz$/ ) {
113 my $dest_path = $tmp;
114 $dest_path =~ s!/[^/]+$!!; #!vim-fix
115 mkpath $dest_path unless -e $dest_path;
116 file_copy( '<:gzip', $path, '>', $tmp );
117 $path = $tmp;
118 }
119 return -$! unless sysopen($fh , $path, $mode);
120 $pending->{$file}->{fh} = $fh;
121 $pending->{$file}->{path} = $path;
122 } elsif ( ! defined( $pending->{$file}->{fh} ) ) {
123 die "can't find fh for $file ", dump($pending);
124 }
125 return 0;
126 }
127
128 sub x_read {
129 my ($file,$bufsize,$off) = @_;
130 my ($rv) = -ENOSYS();
131 my $path = fixup( $file );
132 return -ENOENT() unless -e $path;
133 my ($fsize) = -s $path;
134 my $fh = $pending->{$file}->{fh} || die "no fh? ", dump( $pending );
135 if(seek($fh,$off,SEEK_SET)) {
136 read($fh,$rv,$bufsize);
137 }
138 return $rv;
139 }
140
141 sub x_write {
142 my ($file,$buf,$off) = @_;
143 $pending->{$file}->{write}++;
144 my ($rv);
145 my $path = fixup($file);
146 return -ENOENT() unless -e $path;
147 my ($fsize) = -s $path;
148 my $fh = $pending->{$file}->{fh};
149 return -ENOSYS() unless $fh;
150 if($rv = seek( $fh ,$off,SEEK_SET)) {
151 $rv = print( $fh $buf );
152 }
153 $rv = -ENOSYS() unless $rv;
154 return length($buf);
155 }
156
157 sub err { return (-shift || -$!) }
158
159 sub x_readlink { return readlink(fixup(shift)); }
160 sub x_unlink { return unlink(fixup(shift)) ? 0 : -$!; }
161
162 sub x_symlink { return symlink(shift,fixup(shift)) ? 0 : -$!; }
163
164 sub x_rename {
165 my ($old) = fixup(shift);
166 my ($new) = fixup(shift);
167 my ($err) = rename($old,$new) ? 0 : -ENOENT();
168 return $err;
169 }
170 sub x_link { return link(fixup(shift),fixup(shift)) ? 0 : -$! }
171
172 sub x_chown {
173 my ($path) = fixup(shift);
174 print "nonexistent $path\n" unless -e $path;
175 my ($uid,$gid) = @_;
176 # perl's chown() does not chown symlinks, it chowns the symlink's
177 # target. it fails when the link's target doesn't exist, because
178 # the stat64() syscall fails.
179 # this causes error messages when unpacking symlinks in tarballs.
180 my ($err) = syscall(&SYS_lchown,$path,$uid,$gid,$path) ? -$! : 0;
181 return $err;
182 }
183
184 sub x_chmod {
185 my ($path) = fixup(shift);
186 my ($mode) = shift;
187 my ($err) = chmod($mode,$path) ? 0 : -$!;
188 return $err;
189 }
190
191 sub x_truncate { return truncate(fixup(shift),shift) ? 0 : -$! ; }
192 sub x_utime { return utime($_[1],$_[2],fixup($_[0])) ? 0:-$!; }
193
194 sub x_mkdir { my ($name, $perm) = @_; return 0 if mkdir(fixup($name),$perm); return -$!; }
195 sub x_rmdir { return 0 if rmdir fixup(shift); return -$!; }
196
197 sub x_mknod {
198 # since this is called for ALL files, not just devices, I'll do some checks
199 # and possibly run the real mknod command.
200 my ($file, $modes, $dev) = @_;
201 $file = fixup($file);
202 $! = 0;
203 syscall(&SYS_mknod,$file,$modes,$dev);
204 return -$!;
205 }
206
207 sub x_release {
208 my ( $file, $mode ) = @_;
209 if ( ! defined( $pending->{$file} ) ) {
210 warn "release $file, NO PENDING DATA\n";
211 return 0;
212 } elsif ( ! defined( $pending->{$file}->{write} ) ) {
213 warn "release $file, not written into\n";
214 } elsif ( defined( $pending->{$file}->{open} ) && $pending->{$file}->{open} == 1 ) {
215 close( $pending->{$file}->{fh} ) || warn "can't close $file: $!";
216 if ( $file =~ $skip_extensions_regex ) {
217 warn "release $file $mode -- uncompressed\n";
218 } else {
219 warn "release $file $mode -- compressing\n";
220
221 my $path = $pending->{$file}->{path} || die "no path for $file ? ", dump( $pending );
222 my $dest = fixup( $file );
223
224 if ( $dest =~ /\.gz$/ ) {
225 warn "## remove old $dest\n";
226 unlink $dest || die "can't remove $dest: $!";
227 $dest =~ s/\.gz$//;
228 }
229
230 file_copy( '<', $path, '>:gzip', $dest . '.gz' );
231
232 # FIXME add timeout to remove uncompressed version?
233 unlink $path || warn "can't remove $path: $!";
234 }
235 } else {
236 warn "release $file, but still used ", $pending->{$file}->{open} , " times, delaying compression\n";
237 $pending->{$file}->{open}--;
238 return 0;
239 }
240 delete( $pending->{$file} );
241 return 0;
242 }
243
244 # kludge
245 sub x_statfs {return 255,1000000,500000,1000000,500000,4096}
246 Fuse::main(
247 mountpoint=>$mount->{to},
248 getattr =>"main::x_getattr",
249 readlink=>"main::x_readlink",
250 getdir =>"main::x_getdir",
251 mknod =>"main::x_mknod",
252 mkdir =>"main::x_mkdir",
253 unlink =>"main::x_unlink",
254 rmdir =>"main::x_rmdir",
255 symlink =>"main::x_symlink",
256 rename =>"main::x_rename",
257 link =>"main::x_link",
258 chmod =>"main::x_chmod",
259 chown =>"main::x_chown",
260 truncate=>"main::x_truncate",
261 utime =>"main::x_utime",
262 open =>"main::x_open",
263 read =>"main::x_read",
264 write =>"main::x_write",
265 statfs =>"main::x_statfs",
266 release =>"main::x_release",
267 # threaded=>1,
268 # debug => 1,
269 );

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