| 1 |
#!/usr/bin/perl |
#!/usr/bin/perl |
| 2 |
|
|
| 3 |
use POSIX qw(ENOENT EISDIR EINVAL); |
package Fuse::DBI; |
|
use Fuse; |
|
| 4 |
|
|
| 5 |
use DBI; |
use 5.008; |
| 6 |
use strict; |
use strict; |
| 7 |
|
use warnings; |
| 8 |
|
|
| 9 |
my $sql_filenames = q{ |
use POSIX qw(ENOENT EISDIR EINVAL ENOSYS O_RDWR); |
| 10 |
select |
use Fuse; |
| 11 |
templateid as id, |
use DBI; |
| 12 |
namespace||'/'||name||' ['||templateid||']' as filename, |
use Carp; |
| 13 |
length(template) as size, |
use Data::Dumper; |
| 14 |
iseditable as writable |
|
| 15 |
from template ; |
|
| 16 |
}; |
our $VERSION = '0.06'; |
| 17 |
|
|
| 18 |
|
=head1 NAME |
| 19 |
|
|
| 20 |
|
Fuse::DBI - mount your database as filesystem and use it |
| 21 |
|
|
| 22 |
|
=head1 SYNOPSIS |
| 23 |
|
|
| 24 |
|
use Fuse::DBI; |
| 25 |
|
Fuse::DBI->mount( ... ); |
| 26 |
|
|
| 27 |
|
See C<run> below for examples how to set parameters. |
| 28 |
|
|
| 29 |
|
=head1 DESCRIPTION |
| 30 |
|
|
| 31 |
|
This module will use C<Fuse> module, part of C<FUSE (Filesystem in USErspace)> |
| 32 |
|
available at L<http://fuse.sourceforge.net/> to mount |
| 33 |
|
your database as file system. |
| 34 |
|
|
| 35 |
|
That will give you possibility to use normal file-system tools (cat, grep, vi) |
| 36 |
|
to manipulate data in database. |
| 37 |
|
|
| 38 |
|
It's actually opposite of Oracle's intention to put everything into database. |
| 39 |
|
|
| 40 |
|
|
| 41 |
|
=head1 METHODS |
| 42 |
|
|
| 43 |
|
=cut |
| 44 |
|
|
| 45 |
|
=head2 mount |
| 46 |
|
|
| 47 |
|
Mount your database as filesystem. |
| 48 |
|
|
| 49 |
|
Let's suppose that your database have table C<files> with following structure: |
| 50 |
|
|
| 51 |
|
id: int |
| 52 |
|
filename: text |
| 53 |
|
size: int |
| 54 |
|
content: text |
| 55 |
|
writable: boolean |
| 56 |
|
|
| 57 |
|
Following is example how to mount table like that to C</mnt>: |
| 58 |
|
|
| 59 |
|
my $mnt = Fuse::DBI->mount({ |
| 60 |
|
'filenames' => 'select id,filename,size,writable from files', |
| 61 |
|
'read' => 'select content from files where id = ?', |
| 62 |
|
'update' => 'update files set content = ? where id = ?', |
| 63 |
|
'dsn' => 'DBI:Pg:dbname=test_db', |
| 64 |
|
'user' => 'database_user', |
| 65 |
|
'password' => 'database_password', |
| 66 |
|
'invalidate' => sub { ... }, |
| 67 |
|
}); |
| 68 |
|
|
| 69 |
|
Options: |
| 70 |
|
|
| 71 |
|
=over 5 |
| 72 |
|
|
| 73 |
|
=item filenames |
| 74 |
|
|
| 75 |
|
SQL query which returns C<id> (unique id for that row), C<filename>, |
| 76 |
|
C<size> and C<writable> boolean flag. |
| 77 |
|
|
| 78 |
|
=item read |
| 79 |
|
|
| 80 |
|
SQL query which returns only one column with content of file and has |
| 81 |
|
placeholder C<?> for C<id>. |
| 82 |
|
|
| 83 |
|
=item update |
| 84 |
|
|
| 85 |
|
SQL query with two pace-holders, one for new content and one for C<id>. |
| 86 |
|
|
| 87 |
|
=item dsn |
| 88 |
|
|
| 89 |
|
C<DBI> dsn to connect to (contains database driver and name of database). |
| 90 |
|
|
| 91 |
|
=item user |
| 92 |
|
|
| 93 |
|
User with which to connect to database |
| 94 |
|
|
| 95 |
|
=item password |
| 96 |
|
|
| 97 |
|
Password for connecting to database |
| 98 |
|
|
| 99 |
|
=item invalidate |
| 100 |
|
|
| 101 |
|
Optional anonymous code reference which will be executed when data is updated in |
| 102 |
|
database. It can be used as hook to delete cache (for example on-disk-cache) |
| 103 |
|
which is created from data edited through C<Fuse::DBI>. |
| 104 |
|
|
| 105 |
|
=item fork |
| 106 |
|
|
| 107 |
|
Optional flag which forks after mount so that executing script will continue |
| 108 |
|
running. Implementation is experimental. |
| 109 |
|
|
| 110 |
|
=back |
| 111 |
|
|
| 112 |
|
=cut |
| 113 |
|
|
| 114 |
|
my $dbh; |
| 115 |
|
my $sth; |
| 116 |
|
my $ctime_start; |
| 117 |
|
|
| 118 |
|
sub read_filenames; |
| 119 |
|
sub fuse_module_loaded; |
| 120 |
|
|
| 121 |
|
# evil, evil way to solve this. It makes this module non-reentrant. But, since |
| 122 |
|
# fuse calls another copy of this script for each mount anyway, this shouldn't |
| 123 |
|
# be a problem. |
| 124 |
|
my $fuse_self; |
| 125 |
|
|
| 126 |
|
sub mount { |
| 127 |
|
my $class = shift; |
| 128 |
|
my $self = {}; |
| 129 |
|
bless($self, $class); |
| 130 |
|
|
| 131 |
|
my $arg = shift; |
| 132 |
|
|
| 133 |
|
print Dumper($arg); |
| 134 |
|
|
| 135 |
|
carp "mount needs 'dsn' to connect to (e.g. dsn => 'DBI:Pg:dbname=test')" unless ($arg->{'dsn'}); |
| 136 |
|
carp "mount needs 'mount' as mountpoint" unless ($arg->{'mount'}); |
| 137 |
|
|
| 138 |
|
# save (some) arguments in self |
| 139 |
|
foreach (qw(mount invalidate)) { |
| 140 |
|
$self->{$_} = $arg->{$_}; |
| 141 |
|
} |
| 142 |
|
|
| 143 |
|
foreach (qw(filenames read update)) { |
| 144 |
|
carp "mount needs '$_' SQL" unless ($arg->{$_}); |
| 145 |
|
} |
| 146 |
|
|
| 147 |
|
$ctime_start = time(); |
| 148 |
|
|
| 149 |
|
my $pid; |
| 150 |
|
if ($arg->{'fork'}) { |
| 151 |
|
$pid = fork(); |
| 152 |
|
die "fork() failed: $!" unless defined $pid; |
| 153 |
|
# child will return to caller |
| 154 |
|
if ($pid) { |
| 155 |
|
return $self; |
| 156 |
|
} |
| 157 |
|
} |
| 158 |
|
|
| 159 |
|
$dbh = DBI->connect($arg->{'dsn'},$arg->{'user'},$arg->{'password'}, {AutoCommit => 0, RaiseError => 1}) || die $DBI::errstr; |
| 160 |
|
|
| 161 |
|
$sth->{'filenames'} = $dbh->prepare($arg->{'filenames'}) || die $dbh->errstr(); |
| 162 |
|
|
| 163 |
|
$sth->{'read'} = $dbh->prepare($arg->{'read'}) || die $dbh->errstr(); |
| 164 |
|
$sth->{'update'} = $dbh->prepare($arg->{'update'}) || die $dbh->errstr(); |
| 165 |
|
|
| 166 |
|
|
| 167 |
|
$self->{'sth'} = $sth; |
| 168 |
|
|
| 169 |
|
$self->{'read_filenames'} = sub { $self->read_filenames }; |
| 170 |
|
$self->read_filenames; |
| 171 |
|
|
| 172 |
|
$fuse_self = \$self; |
| 173 |
|
|
| 174 |
|
Fuse::main( |
| 175 |
|
mountpoint=>$arg->{'mount'}, |
| 176 |
|
getattr=>\&e_getattr, |
| 177 |
|
getdir=>\&e_getdir, |
| 178 |
|
open=>\&e_open, |
| 179 |
|
statfs=>\&e_statfs, |
| 180 |
|
read=>\&e_read, |
| 181 |
|
write=>\&e_write, |
| 182 |
|
utime=>\&e_utime, |
| 183 |
|
truncate=>\&e_truncate, |
| 184 |
|
unlink=>\&e_unlink, |
| 185 |
|
rmdir=>\&e_unlink, |
| 186 |
|
debug=>0, |
| 187 |
|
); |
| 188 |
|
|
| 189 |
|
exit(0) if ($arg->{'fork'}); |
| 190 |
|
|
| 191 |
|
return 1; |
| 192 |
|
|
|
my $sql_content = q{ |
|
|
select template |
|
|
from template |
|
|
where templateid = ?; |
|
| 193 |
}; |
}; |
| 194 |
|
|
| 195 |
|
=head2 umount |
| 196 |
|
|
| 197 |
|
Unmount your database as filesystem. |
| 198 |
|
|
| 199 |
|
$mnt->umount; |
| 200 |
|
|
| 201 |
|
This will also kill background process which is translating |
| 202 |
|
database to filesystem. |
| 203 |
|
|
| 204 |
|
=cut |
| 205 |
|
|
| 206 |
|
sub umount { |
| 207 |
|
my $self = shift; |
| 208 |
|
|
| 209 |
|
if ($self->{'mount'}) { |
| 210 |
|
if (open(MTAB, "/etc/mtab")) { |
| 211 |
|
my $mounted = 0; |
| 212 |
|
my $mount = $self->{'mount'}; |
| 213 |
|
while(<MTAB>) { |
| 214 |
|
$mounted = 1 if (/ $mount fuse /i); |
| 215 |
|
} |
| 216 |
|
close(MTAB); |
| 217 |
|
|
| 218 |
|
if ($mounted) { |
| 219 |
|
system "fusermount -u ".$self->{'mount'}." 2>&1 >/dev/null" || return 0; |
| 220 |
|
return 1; |
| 221 |
|
} |
| 222 |
|
|
| 223 |
|
} else { |
| 224 |
|
warn "can't open /etc/mtab: $!"; |
| 225 |
|
return 0; |
| 226 |
|
} |
| 227 |
|
} |
| 228 |
|
} |
| 229 |
|
|
| 230 |
|
$SIG{'INT'} = sub { |
| 231 |
|
if ($fuse_self && $$fuse_self->umount) { |
| 232 |
|
print STDERR "umount called by SIG INT\n"; |
| 233 |
|
} |
| 234 |
|
}; |
| 235 |
|
|
| 236 |
my $connect = "DBI:Pg:dbname=webgui"; |
$SIG{'QUIT'} = sub { |
| 237 |
|
if ($fuse_self && $$fuse_self->umount) { |
| 238 |
|
print STDERR "umount called by SIG QUIT\n"; |
| 239 |
|
} |
| 240 |
|
}; |
| 241 |
|
|
| 242 |
my $dbh = DBI->connect($connect,"","") || die $DBI::errstr; |
sub DESTROY { |
| 243 |
|
my $self = shift; |
| 244 |
|
if ($self->umount) { |
| 245 |
|
print STDERR "umount called by DESTROY\n"; |
| 246 |
|
} |
| 247 |
|
} |
| 248 |
|
|
| 249 |
print STDERR "$sql_filenames\n"; |
=head2 fuse_module_loaded |
| 250 |
|
|
| 251 |
my $sth_filenames = $dbh->prepare($sql_filenames) || die $dbh->errstr(); |
Checks if C<fuse> module is loaded in kernel. |
|
$sth_filenames->execute() || die $sth_filenames->errstr(); |
|
| 252 |
|
|
| 253 |
my $sth_content = $dbh->prepare($sql_content) || die $dbh->errstr(); |
die "no fuse module loaded in kernel" |
| 254 |
|
unless (Fuse::DBI::fuse_module_loaded); |
| 255 |
|
|
| 256 |
print "#",join(",",@{ $sth_filenames->{NAME} }),"\n"; |
This function in called by C<mount>, but might be useful alone also. |
| 257 |
|
|
| 258 |
my $ctime_start = time(); |
=cut |
| 259 |
|
|
| 260 |
my (%files) = ( |
sub fuse_module_loaded { |
| 261 |
'.' => { |
my $lsmod = `lsmod`; |
| 262 |
type => 0040, |
die "can't start lsmod: $!" unless ($lsmod); |
| 263 |
mode => 0755, |
if ($lsmod =~ m/fuse/s) { |
| 264 |
}, |
return 1; |
| 265 |
# a => { |
} else { |
| 266 |
# cont => "File 'a'.\n", |
return 0; |
| 267 |
# type => 0100, |
} |
| 268 |
# ctime => time()-2000 |
} |
|
# }, |
|
|
); |
|
| 269 |
|
|
| 270 |
|
my %files; |
| 271 |
my %dirs; |
my %dirs; |
| 272 |
|
|
| 273 |
while (my $row = $sth_filenames->fetchrow_hashref() ) { |
sub read_filenames { |
| 274 |
$files{$row->{'filename'}} = { |
my $self = shift; |
| 275 |
size => $row->{'size'}, |
|
| 276 |
mode => $row->{'writable'} ? 0644 : 0444, |
my $sth = $self->{'sth'} || die "no sth argument"; |
| 277 |
id => $row->{'id'} || 99, |
|
| 278 |
}; |
# create empty filesystem |
| 279 |
|
(%files) = ( |
| 280 |
my $d; |
'.' => { |
| 281 |
foreach (split(m!/!, $row->{'filename'})) { |
type => 0040, |
| 282 |
# first, entry is assumed to be file |
mode => 0755, |
| 283 |
if ($d) { |
}, |
| 284 |
$files{$d} = { |
'..' => { |
| 285 |
size => $dirs{$d}++, |
type => 0040, |
| 286 |
mode => 0755, |
mode => 0755, |
| 287 |
type => 0040 |
}, |
| 288 |
}; |
# a => { |
| 289 |
$files{$d.'/.'} = { |
# cont => "File 'a'.\n", |
| 290 |
mode => 0755, |
# type => 0100, |
| 291 |
type => 0040 |
# ctime => time()-2000 |
| 292 |
}; |
# }, |
| 293 |
$files{$d.'/..'} = { |
); |
| 294 |
mode => 0755, |
|
| 295 |
type => 0040 |
# fetch new filename list from database |
| 296 |
}; |
$sth->{'filenames'}->execute() || die $sth->{'filenames'}->errstr(); |
| 297 |
|
|
| 298 |
|
# read them in with sesible defaults |
| 299 |
|
while (my $row = $sth->{'filenames'}->fetchrow_hashref() ) { |
| 300 |
|
$files{$row->{'filename'}} = { |
| 301 |
|
size => $row->{'size'}, |
| 302 |
|
mode => $row->{'writable'} ? 0644 : 0444, |
| 303 |
|
id => $row->{'id'} || 99, |
| 304 |
|
}; |
| 305 |
|
|
| 306 |
|
my $d; |
| 307 |
|
foreach (split(m!/!, $row->{'filename'})) { |
| 308 |
|
# first, entry is assumed to be file |
| 309 |
|
if ($d) { |
| 310 |
|
$files{$d} = { |
| 311 |
|
size => $dirs{$d}++, |
| 312 |
|
mode => 0755, |
| 313 |
|
type => 0040 |
| 314 |
|
}; |
| 315 |
|
$files{$d.'/.'} = { |
| 316 |
|
mode => 0755, |
| 317 |
|
type => 0040 |
| 318 |
|
}; |
| 319 |
|
$files{$d.'/..'} = { |
| 320 |
|
mode => 0755, |
| 321 |
|
type => 0040 |
| 322 |
|
}; |
| 323 |
|
} |
| 324 |
|
$d .= "/" if ($d); |
| 325 |
|
$d .= "$_"; |
| 326 |
} |
} |
|
$d .= "/" if ($d); |
|
|
$d .= "$_"; |
|
| 327 |
} |
} |
| 328 |
|
|
| 329 |
|
print "found ",scalar(keys %files)-scalar(keys %dirs)," files, ",scalar(keys %dirs), " dirs\n"; |
| 330 |
} |
} |
| 331 |
|
|
|
print scalar (keys %dirs), " dirs:",join(" ",keys %dirs),"\n"; |
|
| 332 |
|
|
| 333 |
sub filename_fixup { |
sub filename_fixup { |
| 334 |
my ($file) = shift; |
my ($file) = shift; |
| 361 |
# return as many text filenames as you like, followed by the retval. |
# return as many text filenames as you like, followed by the retval. |
| 362 |
print((scalar keys %files)." files total\n"); |
print((scalar keys %files)." files total\n"); |
| 363 |
my %out; |
my %out; |
| 364 |
foreach (keys %files) { |
foreach my $f (sort keys %files) { |
|
my $f = $_; |
|
|
$f =~ s/^\E$dirname\Q//; |
|
|
$f =~ s/^\///; |
|
| 365 |
if ($dirname) { |
if ($dirname) { |
| 366 |
$out{$f}++ if (/^\E$dirname\Q/ && $f =~ /^[^\/]+$/); |
if ($f =~ s/^\Q$dirname\E\///) { |
| 367 |
|
$out{$f}++ if ($f =~ /^[^\/]+$/); |
| 368 |
|
} |
| 369 |
} else { |
} else { |
| 370 |
$out{$f}++ if ($f =~ /^[^\/]+$/); |
$out{$f}++ if ($f =~ /^[^\/]+$/); |
| 371 |
} |
} |
|
print "f: $_ -> $f\n"; |
|
| 372 |
} |
} |
| 373 |
if (! %out) { |
if (! %out) { |
| 374 |
$out{'no files? bug?'}++; |
$out{'no files? bug?'}++; |
| 375 |
} |
} |
| 376 |
print scalar keys %out," files found for '$dirname': ",keys %out,"\n"; |
print scalar keys %out," files in dir '$dirname'\n"; |
| 377 |
|
print "## ",join(" ",keys %out),"\n"; |
| 378 |
return (keys %out),0; |
return (keys %out),0; |
| 379 |
} |
} |
| 380 |
|
|
| 381 |
|
sub read_content { |
| 382 |
|
my ($file,$id) = @_; |
| 383 |
|
|
| 384 |
|
die "read_content needs file and id" unless ($file && $id); |
| 385 |
|
|
| 386 |
|
$sth->{'read'}->execute($id) || die $sth->{'read'}->errstr; |
| 387 |
|
$files{$file}{cont} = $sth->{'read'}->fetchrow_array; |
| 388 |
|
# I should modify ctime only if content in database changed |
| 389 |
|
#$files{$file}{ctime} = time() unless ($files{$file}{ctime}); |
| 390 |
|
print "file '$file' content [",length($files{$file}{cont})," bytes] read in cache\n"; |
| 391 |
|
} |
| 392 |
|
|
| 393 |
|
|
| 394 |
sub e_open { |
sub e_open { |
| 395 |
# VFS sanity check; it keeps all the necessary state, not much to do here. |
# VFS sanity check; it keeps all the necessary state, not much to do here. |
| 396 |
my ($file) = filename_fixup(shift); |
my $file = filename_fixup(shift); |
| 397 |
print("open called\n"); |
my $flags = shift; |
| 398 |
|
|
| 399 |
return -ENOENT() unless exists($files{$file}); |
return -ENOENT() unless exists($files{$file}); |
| 400 |
return -EISDIR() unless exists($files{$file}{id}); |
return -EISDIR() unless exists($files{$file}{id}); |
| 401 |
if (!exists($files{$file}{cont})) { |
|
| 402 |
$sth_content->execute($files{$file}{id}); |
read_content($file,$files{$file}{id}) unless exists($files{$file}{cont}); |
| 403 |
($files{$file}{cont}) = $sth_content->fetchrow_array; |
|
| 404 |
} |
print "open '$file' ",length($files{$file}{cont})," bytes\n"; |
|
print("open ok\n"); |
|
| 405 |
return 0; |
return 0; |
| 406 |
} |
} |
| 407 |
|
|
| 408 |
sub e_read { |
sub e_read { |
| 409 |
# return an error numeric, or binary/text string. (note: 0 means EOF, "0" will |
# return an error numeric, or binary/text string. |
| 410 |
# give a byte (ascii "0") to the reading program) |
# (note: 0 means EOF, "0" will give a byte (ascii "0") |
| 411 |
|
# to the reading program) |
| 412 |
my ($file) = filename_fixup(shift); |
my ($file) = filename_fixup(shift); |
| 413 |
my ($buf,$off) = @_; |
my ($buf_len,$off) = @_; |
| 414 |
|
|
| 415 |
return -ENOENT() unless exists($files{$file}); |
return -ENOENT() unless exists($files{$file}); |
| 416 |
return -EINVAL() if $off > length($files{$file}{cont}); |
|
| 417 |
return 0 if $off == length($files{$file}{cont}); |
my $len = length($files{$file}{cont}); |
| 418 |
return substr($files{$file}{cont},$off,$buf); |
|
| 419 |
|
print "read '$file' [$len bytes] offset $off length $buf_len\n"; |
| 420 |
|
|
| 421 |
|
return -EINVAL() if ($off > $len); |
| 422 |
|
return 0 if ($off == $len); |
| 423 |
|
|
| 424 |
|
$buf_len = $len-$off if ($len - $off < $buf_len); |
| 425 |
|
|
| 426 |
|
return substr($files{$file}{cont},$off,$buf_len); |
| 427 |
|
} |
| 428 |
|
|
| 429 |
|
sub clear_cont { |
| 430 |
|
print "transaction rollback\n"; |
| 431 |
|
$dbh->rollback || die $dbh->errstr; |
| 432 |
|
print "invalidate all cached content\n"; |
| 433 |
|
foreach my $f (keys %files) { |
| 434 |
|
delete $files{$f}{cont}; |
| 435 |
|
delete $files{$f}{ctime}; |
| 436 |
|
} |
| 437 |
|
print "begin new transaction\n"; |
| 438 |
|
#$dbh->begin_work || die $dbh->errstr; |
| 439 |
|
} |
| 440 |
|
|
| 441 |
|
|
| 442 |
|
sub update_db { |
| 443 |
|
my $file = shift || die; |
| 444 |
|
|
| 445 |
|
$files{$file}{ctime} = time(); |
| 446 |
|
|
| 447 |
|
my ($cont,$id) = ( |
| 448 |
|
$files{$file}{cont}, |
| 449 |
|
$files{$file}{id} |
| 450 |
|
); |
| 451 |
|
|
| 452 |
|
if (!$sth->{'update'}->execute($cont,$id)) { |
| 453 |
|
print "update problem: ",$sth->{'update'}->errstr; |
| 454 |
|
clear_cont; |
| 455 |
|
return 0; |
| 456 |
|
} else { |
| 457 |
|
if (! $dbh->commit) { |
| 458 |
|
print "ERROR: commit problem: ",$sth->{'update'}->errstr; |
| 459 |
|
clear_cont; |
| 460 |
|
return 0; |
| 461 |
|
} |
| 462 |
|
print "updated '$file' [",$files{$file}{id},"]\n"; |
| 463 |
|
|
| 464 |
|
$$fuse_self->{'invalidate'}->() if (ref $$fuse_self->{'invalidate'}); |
| 465 |
|
} |
| 466 |
|
return 1; |
| 467 |
|
} |
| 468 |
|
|
| 469 |
|
sub e_write { |
| 470 |
|
my $file = filename_fixup(shift); |
| 471 |
|
my ($buffer,$off) = @_; |
| 472 |
|
|
| 473 |
|
return -ENOENT() unless exists($files{$file}); |
| 474 |
|
|
| 475 |
|
my $cont = $files{$file}{cont}; |
| 476 |
|
my $len = length($cont); |
| 477 |
|
|
| 478 |
|
print "write '$file' [$len bytes] offset $off length ",length($buffer),"\n"; |
| 479 |
|
|
| 480 |
|
$files{$file}{cont} = ""; |
| 481 |
|
|
| 482 |
|
$files{$file}{cont} .= substr($cont,0,$off) if ($off > 0); |
| 483 |
|
$files{$file}{cont} .= $buffer; |
| 484 |
|
$files{$file}{cont} .= substr($cont,$off+length($buffer),$len-$off-length($buffer)) if ($off+length($buffer) < $len); |
| 485 |
|
|
| 486 |
|
$files{$file}{size} = length($files{$file}{cont}); |
| 487 |
|
|
| 488 |
|
if (! update_db($file)) { |
| 489 |
|
return -ENOSYS(); |
| 490 |
|
} else { |
| 491 |
|
return length($buffer); |
| 492 |
|
} |
| 493 |
|
} |
| 494 |
|
|
| 495 |
|
sub e_truncate { |
| 496 |
|
my $file = filename_fixup(shift); |
| 497 |
|
my $size = shift; |
| 498 |
|
|
| 499 |
|
print "truncate to $size\n"; |
| 500 |
|
|
| 501 |
|
$files{$file}{cont} = substr($files{$file}{cont},0,$size); |
| 502 |
|
$files{$file}{size} = $size; |
| 503 |
|
return 0 |
| 504 |
|
}; |
| 505 |
|
|
| 506 |
|
|
| 507 |
|
sub e_utime { |
| 508 |
|
my ($atime,$mtime,$file) = @_; |
| 509 |
|
$file = filename_fixup($file); |
| 510 |
|
|
| 511 |
|
return -ENOENT() unless exists($files{$file}); |
| 512 |
|
|
| 513 |
|
print "utime '$file' $atime $mtime\n"; |
| 514 |
|
|
| 515 |
|
$files{$file}{time} = $mtime; |
| 516 |
|
return 0; |
| 517 |
} |
} |
| 518 |
|
|
| 519 |
sub e_statfs { return 255, 1, 1, 1, 1, 2 } |
sub e_statfs { return 255, 1, 1, 1, 1, 2 } |
| 520 |
|
|
| 521 |
# If you run the script directly, it will run fusermount, which will in turn |
sub e_unlink { |
| 522 |
# re-run this script. Hence the funky semantics. |
my $file = filename_fixup(shift); |
| 523 |
my ($mountpoint) = ""; |
|
| 524 |
$mountpoint = shift(@ARGV) if @ARGV; |
if (exists( $dirs{$file} )) { |
| 525 |
Fuse::main( |
print "unlink '$file' will re-read template names\n"; |
| 526 |
mountpoint=>$mountpoint, |
print Dumper($fuse_self); |
| 527 |
getattr=>\&e_getattr, |
$$fuse_self->{'read_filenames'}->(); |
| 528 |
getdir=>\&e_getdir, |
return 0; |
| 529 |
open=>\&e_open, |
} elsif (exists( $files{$file} )) { |
| 530 |
statfs=>\&e_statfs, |
print "unlink '$file' will invalidate cache\n"; |
| 531 |
read=>\&e_read, |
read_content($file,$files{$file}{id}); |
| 532 |
debug=>1, |
return 0; |
| 533 |
); |
} |
| 534 |
|
|
| 535 |
|
return -ENOENT(); |
| 536 |
|
} |
| 537 |
|
1; |
| 538 |
|
__END__ |
| 539 |
|
|
| 540 |
|
=head1 EXPORT |
| 541 |
|
|
| 542 |
|
Nothing. |
| 543 |
|
|
| 544 |
|
=head1 BUGS |
| 545 |
|
|
| 546 |
|
Size information (C<ls -s>) is wrong. It's a problem in upstream Fuse module |
| 547 |
|
(for which I'm to blame lately), so when it gets fixes, C<Fuse::DBI> will |
| 548 |
|
automagically pick it up. |
| 549 |
|
|
| 550 |
|
=head1 SEE ALSO |
| 551 |
|
|
| 552 |
|
C<FUSE (Filesystem in USErspace)> website |
| 553 |
|
L<http://fuse.sourceforge.net/> |
| 554 |
|
|
| 555 |
|
Example for WebGUI which comes with this distribution in |
| 556 |
|
directory C<examples/webgui.pl>. It also contains a lot of documentation |
| 557 |
|
about design of this module, usage and limitations. |
| 558 |
|
|
| 559 |
|
=head1 AUTHOR |
| 560 |
|
|
| 561 |
|
Dobrica Pavlinusic, E<lt>dpavlin@rot13.orgE<gt> |
| 562 |
|
|
| 563 |
|
=head1 COPYRIGHT AND LICENSE |
| 564 |
|
|
| 565 |
|
Copyright (C) 2004 by Dobrica Pavlinusic |
| 566 |
|
|
| 567 |
|
This library is free software; you can redistribute it and/or modify |
| 568 |
|
it under the same terms as Perl itself, either Perl version 5.8.4 or, |
| 569 |
|
at your option, any later version of Perl 5 you may have available. |
| 570 |
|
|
| 571 |
|
|
| 572 |
|
=cut |
| 573 |
|
|
Parent Directory
| 
Revision Log
| 
Patch