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#!/usr/bin/perl |
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package Fuse::DBI; |
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use 5.008; |
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use strict; |
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use warnings; |
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use POSIX qw(ENOENT EISDIR EINVAL ENOSYS O_RDWR); |
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use Fuse; |
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use DBI; |
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use Carp; |
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use Data::Dumper; |
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our $VERSION = '0.07'; |
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# block size for this filesystem |
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use constant BLOCK => 1024; |
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=head1 NAME |
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Fuse::DBI - mount your database as filesystem and use it |
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=head1 SYNOPSIS |
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use Fuse::DBI; |
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Fuse::DBI->mount( ... ); |
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See C<run> below for examples how to set parameters. |
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=head1 DESCRIPTION |
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This module will use C<Fuse> module, part of C<FUSE (Filesystem in USErspace)> |
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available at L<http://fuse.sourceforge.net/> to mount |
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your database as file system. |
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That will give you possibility to use normal file-system tools (cat, grep, vi) |
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to manipulate data in database. |
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It's actually opposite of Oracle's intention to put everything into database. |
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=head1 METHODS |
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=cut |
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=head2 mount |
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Mount your database as filesystem. |
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Let's suppose that your database have table C<files> with following structure: |
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id: int |
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filename: text |
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size: int |
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content: text |
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writable: boolean |
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Following is example how to mount table like that to C</mnt>: |
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my $mnt = Fuse::DBI->mount({ |
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'filenames' => 'select id,filename,size,writable from files', |
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'read' => 'select content from files where id = ?', |
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'update' => 'update files set content = ? where id = ?', |
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'dsn' => 'DBI:Pg:dbname=test_db', |
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'user' => 'database_user', |
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'password' => 'database_password', |
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'invalidate' => sub { ... }, |
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}); |
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Options: |
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=over 5 |
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=item filenames |
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SQL query which returns C<id> (unique id for that row), C<filename>, |
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C<size> and C<writable> boolean flag. |
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=item read |
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SQL query which returns only one column with content of file and has |
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placeholder C<?> for C<id>. |
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=item update |
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SQL query with two pace-holders, one for new content and one for C<id>. |
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=item dsn |
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C<DBI> dsn to connect to (contains database driver and name of database). |
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=item user |
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User with which to connect to database |
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=item password |
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Password for connecting to database |
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=item invalidate |
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Optional anonymous code reference which will be executed when data is updated in |
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database. It can be used as hook to delete cache (for example on-disk-cache) |
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which is created from data edited through C<Fuse::DBI>. |
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=item fork |
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Optional flag which forks after mount so that executing script will continue |
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running. Implementation is experimental. |
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=back |
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=cut |
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my $dbh; |
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my $sth; |
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my $ctime_start; |
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sub read_filenames; |
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sub fuse_module_loaded; |
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# evil, evil way to solve this. It makes this module non-reentrant. But, since |
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# fuse calls another copy of this script for each mount anyway, this shouldn't |
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# be a problem. |
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my $fuse_self; |
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sub mount { |
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my $class = shift; |
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my $self = {}; |
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bless($self, $class); |
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my $arg = shift; |
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print Dumper($arg); |
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unless ($self->fuse_module_loaded) { |
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print STDERR "no fuse module loaded. Trying sudo modprobe fuse!\n"; |
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system "sudo modprobe fuse" || die "can't modprobe fuse using sudo!\n"; |
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} |
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carp "mount needs 'dsn' to connect to (e.g. dsn => 'DBI:Pg:dbname=test')" unless ($arg->{'dsn'}); |
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carp "mount needs 'mount' as mountpoint" unless ($arg->{'mount'}); |
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# save (some) arguments in self |
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foreach (qw(mount invalidate)) { |
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$self->{$_} = $arg->{$_}; |
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} |
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foreach (qw(filenames read update)) { |
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carp "mount needs '$_' SQL" unless ($arg->{$_}); |
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} |
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$ctime_start = time(); |
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my $pid; |
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if ($arg->{'fork'}) { |
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$pid = fork(); |
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die "fork() failed: $!" unless defined $pid; |
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# child will return to caller |
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if ($pid) { |
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my $counter = 4; |
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while ($counter && ! $self->is_mounted) { |
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select(undef, undef, undef, 0.5); |
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$counter--; |
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} |
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if ($self->is_mounted) { |
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return $self; |
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} else { |
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return undef; |
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} |
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} |
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} |
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$dbh = DBI->connect($arg->{'dsn'},$arg->{'user'},$arg->{'password'}, {AutoCommit => 0, RaiseError => 1}) || die $DBI::errstr; |
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$sth->{'filenames'} = $dbh->prepare($arg->{'filenames'}) || die $dbh->errstr(); |
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$sth->{'read'} = $dbh->prepare($arg->{'read'}) || die $dbh->errstr(); |
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$sth->{'update'} = $dbh->prepare($arg->{'update'}) || die $dbh->errstr(); |
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$self->{'sth'} = $sth; |
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$self->{'read_filenames'} = sub { $self->read_filenames }; |
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$self->read_filenames; |
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$fuse_self = \$self; |
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Fuse::main( |
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mountpoint=>$arg->{'mount'}, |
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getattr=>\&e_getattr, |
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getdir=>\&e_getdir, |
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open=>\&e_open, |
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statfs=>\&e_statfs, |
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read=>\&e_read, |
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write=>\&e_write, |
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utime=>\&e_utime, |
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truncate=>\&e_truncate, |
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unlink=>\&e_unlink, |
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rmdir=>\&e_unlink, |
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debug=>0, |
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); |
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exit(0) if ($arg->{'fork'}); |
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return 1; |
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}; |
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=head2 is_mounted |
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Check if fuse filesystem is mounted |
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if ($mnt->is_mounted) { ... } |
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=cut |
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sub is_mounted { |
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my $self = shift; |
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my $mounted = 0; |
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my $mount = $self->{'mount'} || confess "can't find mount point!"; |
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if (open(MTAB, "/etc/mtab")) { |
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while(<MTAB>) { |
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$mounted = 1 if (/ $mount fuse /i); |
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} |
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close(MTAB); |
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} else { |
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warn "can't open /etc/mtab: $!"; |
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} |
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return $mounted; |
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} |
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=head2 umount |
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Unmount your database as filesystem. |
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$mnt->umount; |
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This will also kill background process which is translating |
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database to filesystem. |
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=cut |
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sub umount { |
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my $self = shift; |
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if ($self->{'mount'} && $self->is_mounted) { |
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system "( fusermount -u ".$self->{'mount'}." 2>&1 ) >/dev/null"; |
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if ($self->is_mounted) { |
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system "sudo umount ".$self->{'mount'} || |
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return 0; |
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} |
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return 1; |
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} |
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return 0; |
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} |
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$SIG{'INT'} = sub { |
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if ($fuse_self && $$fuse_self->umount) { |
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print STDERR "umount called by SIG INT\n"; |
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} |
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}; |
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$SIG{'QUIT'} = sub { |
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if ($fuse_self && $$fuse_self->umount) { |
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print STDERR "umount called by SIG QUIT\n"; |
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} |
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}; |
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sub DESTROY { |
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my $self = shift; |
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if ($self->umount) { |
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print STDERR "umount called by DESTROY\n"; |
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} |
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} |
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=head2 fuse_module_loaded |
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Checks if C<fuse> module is loaded in kernel. |
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die "no fuse module loaded in kernel" |
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unless (Fuse::DBI::fuse_module_loaded); |
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This function in called by C<mount>, but might be useful alone also. |
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=cut |
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sub fuse_module_loaded { |
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my $lsmod = `lsmod`; |
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die "can't start lsmod: $!" unless ($lsmod); |
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if ($lsmod =~ m/fuse/s) { |
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return 1; |
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} else { |
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return 0; |
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} |
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} |
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my %files; |
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sub read_filenames { |
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my $self = shift; |
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my $sth = $self->{'sth'} || die "no sth argument"; |
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# create empty filesystem |
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(%files) = ( |
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'.' => { |
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type => 0040, |
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mode => 0755, |
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}, |
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'..' => { |
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type => 0040, |
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mode => 0755, |
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}, |
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# a => { |
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# cont => "File 'a'.\n", |
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# type => 0100, |
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# ctime => time()-2000 |
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# }, |
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); |
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# fetch new filename list from database |
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$sth->{'filenames'}->execute() || die $sth->{'filenames'}->errstr(); |
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# read them in with sesible defaults |
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while (my $row = $sth->{'filenames'}->fetchrow_hashref() ) { |
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$files{$row->{'filename'}} = { |
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size => $row->{'size'}, |
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mode => $row->{'writable'} ? 0644 : 0444, |
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id => $row->{'id'} || 99, |
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}; |
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my $d; |
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foreach (split(m!/!, $row->{'filename'})) { |
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# first, entry is assumed to be file |
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if ($d) { |
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$files{$d} = { |
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mode => 0755, |
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type => 0040 |
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}; |
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$files{$d.'/.'} = { |
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mode => 0755, |
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type => 0040 |
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}; |
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$files{$d.'/..'} = { |
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mode => 0755, |
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type => 0040 |
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}; |
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} |
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$d .= "/" if ($d); |
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$d .= "$_"; |
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} |
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} |
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print "found ",scalar(keys %files)," files\n"; |
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} |
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sub filename_fixup { |
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my ($file) = shift; |
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$file =~ s,^/,,; |
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$file = '.' unless length($file); |
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return $file; |
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} |
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sub e_getattr { |
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my ($file) = filename_fixup(shift); |
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$file =~ s,^/,,; |
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$file = '.' unless length($file); |
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return -ENOENT() unless exists($files{$file}); |
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my ($size) = $files{$file}{size} || BLOCK; |
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my ($dev, $ino, $rdev, $blocks, $gid, $uid, $nlink, $blksize) = (0,0,0,int(($size+BLOCK-1)/BLOCK),0,0,1,BLOCK); |
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my ($atime, $ctime, $mtime); |
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$atime = $ctime = $mtime = $files{$file}{ctime} || $ctime_start; |
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my ($modes) = (($files{$file}{type} || 0100)<<9) + $files{$file}{mode}; |
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# 2 possible types of return values: |
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#return -ENOENT(); # or any other error you care to |
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dpavlin |
53 |
#print "getattr($file) ",join(",",($dev,$ino,$modes,$nlink,$uid,$gid,$rdev,$size,$atime,$mtime,$ctime,$blksize,$blocks)),"\n"; |
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dpavlin |
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return ($dev,$ino,$modes,$nlink,$uid,$gid,$rdev,$size,$atime,$mtime,$ctime,$blksize,$blocks); |
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} |
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sub e_getdir { |
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my ($dirname) = shift; |
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$dirname =~ s!^/!!; |
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# return as many text filenames as you like, followed by the retval. |
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print((scalar keys %files)." files total\n"); |
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my %out; |
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dpavlin |
13 |
foreach my $f (sort keys %files) { |
396 |
dpavlin |
1 |
if ($dirname) { |
397 |
dpavlin |
32 |
if ($f =~ s/^\Q$dirname\E\///) { |
398 |
dpavlin |
13 |
$out{$f}++ if ($f =~ /^[^\/]+$/); |
399 |
|
|
} |
400 |
dpavlin |
1 |
} else { |
401 |
|
|
$out{$f}++ if ($f =~ /^[^\/]+$/); |
402 |
|
|
} |
403 |
|
|
} |
404 |
|
|
if (! %out) { |
405 |
|
|
$out{'no files? bug?'}++; |
406 |
|
|
} |
407 |
dpavlin |
8 |
print scalar keys %out," files in dir '$dirname'\n"; |
408 |
dpavlin |
13 |
print "## ",join(" ",keys %out),"\n"; |
409 |
dpavlin |
1 |
return (keys %out),0; |
410 |
|
|
} |
411 |
|
|
|
412 |
dpavlin |
21 |
sub read_content { |
413 |
|
|
my ($file,$id) = @_; |
414 |
|
|
|
415 |
|
|
die "read_content needs file and id" unless ($file && $id); |
416 |
|
|
|
417 |
|
|
$sth->{'read'}->execute($id) || die $sth->{'read'}->errstr; |
418 |
|
|
$files{$file}{cont} = $sth->{'read'}->fetchrow_array; |
419 |
dpavlin |
31 |
# I should modify ctime only if content in database changed |
420 |
|
|
#$files{$file}{ctime} = time() unless ($files{$file}{ctime}); |
421 |
dpavlin |
21 |
print "file '$file' content [",length($files{$file}{cont})," bytes] read in cache\n"; |
422 |
|
|
} |
423 |
|
|
|
424 |
|
|
|
425 |
dpavlin |
1 |
sub e_open { |
426 |
|
|
# VFS sanity check; it keeps all the necessary state, not much to do here. |
427 |
dpavlin |
6 |
my $file = filename_fixup(shift); |
428 |
|
|
my $flags = shift; |
429 |
|
|
|
430 |
dpavlin |
1 |
return -ENOENT() unless exists($files{$file}); |
431 |
|
|
return -EISDIR() unless exists($files{$file}{id}); |
432 |
dpavlin |
6 |
|
433 |
dpavlin |
21 |
read_content($file,$files{$file}{id}) unless exists($files{$file}{cont}); |
434 |
|
|
|
435 |
dpavlin |
3 |
print "open '$file' ",length($files{$file}{cont})," bytes\n"; |
436 |
dpavlin |
1 |
return 0; |
437 |
|
|
} |
438 |
|
|
|
439 |
|
|
sub e_read { |
440 |
dpavlin |
3 |
# return an error numeric, or binary/text string. |
441 |
|
|
# (note: 0 means EOF, "0" will give a byte (ascii "0") |
442 |
|
|
# to the reading program) |
443 |
dpavlin |
1 |
my ($file) = filename_fixup(shift); |
444 |
dpavlin |
8 |
my ($buf_len,$off) = @_; |
445 |
dpavlin |
3 |
|
446 |
dpavlin |
1 |
return -ENOENT() unless exists($files{$file}); |
447 |
dpavlin |
3 |
|
448 |
|
|
my $len = length($files{$file}{cont}); |
449 |
|
|
|
450 |
dpavlin |
8 |
print "read '$file' [$len bytes] offset $off length $buf_len\n"; |
451 |
dpavlin |
3 |
|
452 |
|
|
return -EINVAL() if ($off > $len); |
453 |
|
|
return 0 if ($off == $len); |
454 |
|
|
|
455 |
dpavlin |
21 |
$buf_len = $len-$off if ($len - $off < $buf_len); |
456 |
dpavlin |
3 |
|
457 |
dpavlin |
8 |
return substr($files{$file}{cont},$off,$buf_len); |
458 |
dpavlin |
1 |
} |
459 |
|
|
|
460 |
dpavlin |
6 |
sub clear_cont { |
461 |
dpavlin |
7 |
print "transaction rollback\n"; |
462 |
|
|
$dbh->rollback || die $dbh->errstr; |
463 |
dpavlin |
6 |
print "invalidate all cached content\n"; |
464 |
|
|
foreach my $f (keys %files) { |
465 |
|
|
delete $files{$f}{cont}; |
466 |
dpavlin |
31 |
delete $files{$f}{ctime}; |
467 |
dpavlin |
6 |
} |
468 |
dpavlin |
7 |
print "begin new transaction\n"; |
469 |
dpavlin |
21 |
#$dbh->begin_work || die $dbh->errstr; |
470 |
dpavlin |
6 |
} |
471 |
|
|
|
472 |
|
|
|
473 |
|
|
sub update_db { |
474 |
|
|
my $file = shift || die; |
475 |
|
|
|
476 |
dpavlin |
8 |
$files{$file}{ctime} = time(); |
477 |
|
|
|
478 |
dpavlin |
21 |
my ($cont,$id) = ( |
479 |
|
|
$files{$file}{cont}, |
480 |
|
|
$files{$file}{id} |
481 |
|
|
); |
482 |
|
|
|
483 |
|
|
if (!$sth->{'update'}->execute($cont,$id)) { |
484 |
dpavlin |
9 |
print "update problem: ",$sth->{'update'}->errstr; |
485 |
dpavlin |
6 |
clear_cont; |
486 |
|
|
return 0; |
487 |
|
|
} else { |
488 |
dpavlin |
7 |
if (! $dbh->commit) { |
489 |
dpavlin |
9 |
print "ERROR: commit problem: ",$sth->{'update'}->errstr; |
490 |
dpavlin |
6 |
clear_cont; |
491 |
|
|
return 0; |
492 |
|
|
} |
493 |
|
|
print "updated '$file' [",$files{$file}{id},"]\n"; |
494 |
dpavlin |
24 |
|
495 |
dpavlin |
26 |
$$fuse_self->{'invalidate'}->() if (ref $$fuse_self->{'invalidate'}); |
496 |
dpavlin |
6 |
} |
497 |
|
|
return 1; |
498 |
|
|
} |
499 |
|
|
|
500 |
|
|
sub e_write { |
501 |
|
|
my $file = filename_fixup(shift); |
502 |
dpavlin |
18 |
my ($buffer,$off) = @_; |
503 |
dpavlin |
6 |
|
504 |
|
|
return -ENOENT() unless exists($files{$file}); |
505 |
|
|
|
506 |
dpavlin |
18 |
my $cont = $files{$file}{cont}; |
507 |
|
|
my $len = length($cont); |
508 |
dpavlin |
6 |
|
509 |
dpavlin |
18 |
print "write '$file' [$len bytes] offset $off length ",length($buffer),"\n"; |
510 |
dpavlin |
6 |
|
511 |
dpavlin |
18 |
$files{$file}{cont} = ""; |
512 |
dpavlin |
6 |
|
513 |
dpavlin |
18 |
$files{$file}{cont} .= substr($cont,0,$off) if ($off > 0); |
514 |
|
|
$files{$file}{cont} .= $buffer; |
515 |
dpavlin |
21 |
$files{$file}{cont} .= substr($cont,$off+length($buffer),$len-$off-length($buffer)) if ($off+length($buffer) < $len); |
516 |
dpavlin |
18 |
|
517 |
|
|
$files{$file}{size} = length($files{$file}{cont}); |
518 |
|
|
|
519 |
dpavlin |
6 |
if (! update_db($file)) { |
520 |
|
|
return -ENOSYS(); |
521 |
|
|
} else { |
522 |
dpavlin |
18 |
return length($buffer); |
523 |
dpavlin |
6 |
} |
524 |
|
|
} |
525 |
|
|
|
526 |
|
|
sub e_truncate { |
527 |
|
|
my $file = filename_fixup(shift); |
528 |
|
|
my $size = shift; |
529 |
|
|
|
530 |
dpavlin |
18 |
print "truncate to $size\n"; |
531 |
|
|
|
532 |
dpavlin |
6 |
$files{$file}{cont} = substr($files{$file}{cont},0,$size); |
533 |
dpavlin |
18 |
$files{$file}{size} = $size; |
534 |
dpavlin |
6 |
return 0 |
535 |
|
|
}; |
536 |
|
|
|
537 |
|
|
|
538 |
|
|
sub e_utime { |
539 |
|
|
my ($atime,$mtime,$file) = @_; |
540 |
|
|
$file = filename_fixup($file); |
541 |
|
|
|
542 |
|
|
return -ENOENT() unless exists($files{$file}); |
543 |
|
|
|
544 |
dpavlin |
8 |
print "utime '$file' $atime $mtime\n"; |
545 |
|
|
|
546 |
dpavlin |
6 |
$files{$file}{time} = $mtime; |
547 |
|
|
return 0; |
548 |
|
|
} |
549 |
|
|
|
550 |
dpavlin |
51 |
sub e_statfs { |
551 |
dpavlin |
1 |
|
552 |
dpavlin |
51 |
my $size = 0; |
553 |
|
|
my $inodes = 0; |
554 |
|
|
|
555 |
|
|
foreach my $f (keys %files) { |
556 |
|
|
if ($f !~ /(^|\/)\.\.?$/) { |
557 |
|
|
$size += $files{$f}{size} || 0; |
558 |
|
|
$inodes++; |
559 |
|
|
} |
560 |
|
|
print "$inodes: $f [$size]\n"; |
561 |
|
|
} |
562 |
|
|
|
563 |
dpavlin |
52 |
$size = int(($size+BLOCK-1)/BLOCK); |
564 |
dpavlin |
51 |
|
565 |
dpavlin |
52 |
my @ret = (255, $inodes, 1, $size, $size-1, BLOCK); |
566 |
dpavlin |
51 |
|
567 |
dpavlin |
53 |
#print "statfs: ",join(",",@ret),"\n"; |
568 |
dpavlin |
51 |
|
569 |
|
|
return @ret; |
570 |
|
|
} |
571 |
|
|
|
572 |
dpavlin |
21 |
sub e_unlink { |
573 |
|
|
my $file = filename_fixup(shift); |
574 |
|
|
|
575 |
dpavlin |
51 |
# if (exists( $dirs{$file} )) { |
576 |
|
|
# print "unlink '$file' will re-read template names\n"; |
577 |
|
|
# print Dumper($fuse_self); |
578 |
|
|
# $$fuse_self->{'read_filenames'}->(); |
579 |
|
|
# return 0; |
580 |
|
|
if (exists( $files{$file} )) { |
581 |
dpavlin |
26 |
print "unlink '$file' will invalidate cache\n"; |
582 |
|
|
read_content($file,$files{$file}{id}); |
583 |
|
|
return 0; |
584 |
|
|
} |
585 |
dpavlin |
21 |
|
586 |
dpavlin |
26 |
return -ENOENT(); |
587 |
dpavlin |
21 |
} |
588 |
dpavlin |
9 |
1; |
589 |
|
|
__END__ |
590 |
|
|
|
591 |
|
|
=head1 EXPORT |
592 |
|
|
|
593 |
|
|
Nothing. |
594 |
|
|
|
595 |
dpavlin |
40 |
=head1 BUGS |
596 |
|
|
|
597 |
|
|
Size information (C<ls -s>) is wrong. It's a problem in upstream Fuse module |
598 |
|
|
(for which I'm to blame lately), so when it gets fixes, C<Fuse::DBI> will |
599 |
|
|
automagically pick it up. |
600 |
|
|
|
601 |
dpavlin |
9 |
=head1 SEE ALSO |
602 |
|
|
|
603 |
|
|
C<FUSE (Filesystem in USErspace)> website |
604 |
dpavlin |
36 |
L<http://fuse.sourceforge.net/> |
605 |
dpavlin |
9 |
|
606 |
dpavlin |
28 |
Example for WebGUI which comes with this distribution in |
607 |
dpavlin |
30 |
directory C<examples/webgui.pl>. It also contains a lot of documentation |
608 |
dpavlin |
28 |
about design of this module, usage and limitations. |
609 |
|
|
|
610 |
dpavlin |
9 |
=head1 AUTHOR |
611 |
|
|
|
612 |
|
|
Dobrica Pavlinusic, E<lt>dpavlin@rot13.orgE<gt> |
613 |
|
|
|
614 |
|
|
=head1 COPYRIGHT AND LICENSE |
615 |
|
|
|
616 |
|
|
Copyright (C) 2004 by Dobrica Pavlinusic |
617 |
|
|
|
618 |
|
|
This library is free software; you can redistribute it and/or modify |
619 |
|
|
it under the same terms as Perl itself, either Perl version 5.8.4 or, |
620 |
|
|
at your option, any later version of Perl 5 you may have available. |
621 |
|
|
|
622 |
|
|
|
623 |
|
|
=cut |
624 |
|
|
|