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#!/usr/bin/perl |
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|
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use POSIX qw(ENOENT EISDIR EINVAL ENOSYS O_RDWR); |
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use Fuse; |
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|
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use DBI; |
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use strict; |
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|
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my $sql_filenames = q{ |
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select |
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oid as id, |
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namespace||'/'||name||' ['||oid||']' as filename, |
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length(template) as size, |
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iseditable as writable |
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from template ; |
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}; |
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|
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my $sql_read = q{ |
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select template |
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from template |
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where oid = ?; |
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}; |
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|
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my $sql_update = q{ |
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update template |
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set template = ? |
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where oid = ?; |
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}; |
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|
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|
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my $connect = "DBI:Pg:dbname=webgui"; |
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|
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my $dbh = DBI->connect($connect,"","", { AutoCommit => 0 }) || die $DBI::errstr; |
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|
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print "start transaction\n"; |
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#$dbh->begin_work || die $dbh->errstr; |
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|
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my $sth_filenames = $dbh->prepare($sql_filenames) || die $dbh->errstr(); |
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$sth_filenames->execute() || die $sth_filenames->errstr(); |
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|
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my $sth_read = $dbh->prepare($sql_read) || die $dbh->errstr(); |
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my $sth_update = $dbh->prepare($sql_update) || die $dbh->errstr(); |
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|
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my $ctime_start = time(); |
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|
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my (%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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# 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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|
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my %dirs; |
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|
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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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|
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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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size => $dirs{$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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|
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print "found ",scalar(keys %files)-scalar(keys %dirs)," files, ",scalar(keys %dirs), " dirs\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 $file; |
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} |
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|
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sub e_getattr { |
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my ($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} || 1; |
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my ($dev, $ino, $rdev, $blocks, $gid, $uid, $nlink, $blksize) = (0,0,0,1,0,0,1,1024); |
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my ($atime, $ctime, $mtime); |
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$atime = $ctime = $mtime = $files{$file}{ctime} || $ctime_start; |
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|
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my ($modes) = (($files{$file}{type} || 0100)<<9) + $files{$file}{mode}; |
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|
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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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#print(join(",",($dev,$ino,$modes,$nlink,$uid,$gid,$rdev,$size,$atime,$mtime,$ctime,$blksize,$blocks)),"\n"); |
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return ($dev,$ino,$modes,$nlink,$uid,$gid,$rdev,$size,$atime,$mtime,$ctime,$blksize,$blocks); |
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} |
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|
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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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foreach (keys %files) { |
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my $f = $_; |
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$f =~ s/^\E$dirname\Q//; |
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$f =~ s/^\///; |
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if ($dirname) { |
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$out{$f}++ if (/^\E$dirname\Q/ && $f =~ /^[^\/]+$/); |
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} else { |
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$out{$f}++ if ($f =~ /^[^\/]+$/); |
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} |
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} |
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if (! %out) { |
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$out{'no files? bug?'}++; |
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} |
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print scalar keys %out," files found for '$dirname': ",keys %out,"\n"; |
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return (keys %out),0; |
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} |
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|
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sub e_open { |
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# VFS sanity check; it keeps all the necessary state, not much to do here. |
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my $file = filename_fixup(shift); |
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my $flags = shift; |
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|
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return -ENOENT() unless exists($files{$file}); |
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return -EISDIR() unless exists($files{$file}{id}); |
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|
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if (!exists($files{$file}{cont})) { |
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$sth_read->execute($files{$file}{id}) || die $sth_read->errstr; |
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$files{$file}{cont} = $sth_read->fetchrow_array; |
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print "file '$file' content read in cache\n"; |
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} |
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print "open '$file' ",length($files{$file}{cont})," bytes\n"; |
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return 0; |
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} |
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|
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sub e_read { |
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# return an error numeric, or binary/text string. |
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# (note: 0 means EOF, "0" will give a byte (ascii "0") |
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# to the reading program) |
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my ($file) = filename_fixup(shift); |
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my ($buf,$off) = @_; |
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|
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return -ENOENT() unless exists($files{$file}); |
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|
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my $len = length($files{$file}{cont}); |
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|
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print "read '$file' [$len bytes] offset $off length $buf\n"; |
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|
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return -EINVAL() if ($off > $len); |
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return 0 if ($off == $len); |
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|
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$buf = $len-$off if ($off+$buf > $len); |
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|
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return substr($files{$file}{cont},$off,$buf); |
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} |
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|
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sub clear_cont { |
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print "transaction rollback\n"; |
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$dbh->rollback || die $dbh->errstr; |
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print "invalidate all cached content\n"; |
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foreach my $f (keys %files) { |
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delete $files{$f}{cont}; |
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} |
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print "begin new transaction\n"; |
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$dbh->begin_work || die $dbh->errstr; |
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} |
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|
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|
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sub update_db { |
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my $file = shift || die; |
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|
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if (!$sth_update->execute($files{$file}{cont},$files{$file}{id})) { |
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print "update problem: ",$sth_update->errstr; |
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clear_cont; |
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return 0; |
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} else { |
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if (! $dbh->commit) { |
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print "ERROR: commit problem: ",$sth_update->errstr; |
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clear_cont; |
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return 0; |
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} |
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print "updated '$file' [",$files{$file}{id},"]\n"; |
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} |
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return 1; |
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} |
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|
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sub e_write { |
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my $file = filename_fixup(shift); |
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my ($buf,$off) = @_; |
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|
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return -ENOENT() unless exists($files{$file}); |
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|
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my $len = length($files{$file}{cont}); |
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|
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print "write '$file' [$len bytes] offset $off length $buf\n"; |
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|
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$files{$file}{cont} = |
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substr($files{$file}{cont},0,$off) . |
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$buf . |
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substr($files{$file}{cont},$off+length($buf)); |
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|
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if (! update_db($file)) { |
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return -ENOSYS(); |
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} else { |
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return length($buf); |
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} |
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} |
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|
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sub e_truncate { |
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my $file = filename_fixup(shift); |
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my $size = shift; |
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|
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$files{$file}{cont} = substr($files{$file}{cont},0,$size); |
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return 0 |
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}; |
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|
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|
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sub e_utime { |
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my ($atime,$mtime,$file) = @_; |
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$file = filename_fixup($file); |
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|
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return -ENOENT() unless exists($files{$file}); |
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|
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$files{$file}{time} = $mtime; |
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return 0; |
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} |
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|
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sub e_statfs { return 255, 1, 1, 1, 1, 2 } |
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|
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# If you run the script directly, it will run fusermount, which will in turn |
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# re-run this script. Hence the funky semantics. |
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my ($mountpoint) = ""; |
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$mountpoint = shift(@ARGV) if @ARGV; |
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Fuse::main( |
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mountpoint=>$mountpoint, |
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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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debug=>0, |
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); |