import FUSE perl module to connect to database via DBI

git-svn-id: svn://svn.rot13.org/fuse_dbi/trunk@1 17f4e80c-d0e0-0310-8903-bfc3ae804c12

diff --git a/fuse_dbi.pl b/fuse_dbi.pl
new file mode 100755 (executable)
index 0000000..07f8df1
--- /dev/null
+++ b/fuse_dbi.pl
@@ -0,0 +1,174 @@
+#!/usr/bin/perl
+
+use POSIX qw(ENOENT EISDIR EINVAL);
+use Fuse;
+
+use DBI;
+use strict;
+
+my $sql_filenames = q{
+       select
+               templateid as id,
+               namespace||'/'||name as filename,
+               length(template) as size,
+               iseditable as writable
+       from template ;
+};
+
+my $sql_content = q{
+       select template
+       from template
+       where templateid = ?;
+};
+
+
+my $connect = "DBI:Pg:dbname=webgui";
+
+my $dbh = DBI->connect($connect,"","") || die $DBI::errstr;
+
+print STDERR "$sql_filenames\n";
+
+my $sth_filenames = $dbh->prepare($sql_filenames) || die $dbh->errstr();
+$sth_filenames->execute() || die $sth_filenames->errstr();
+
+my $sth_content = $dbh->prepare($sql_content) || die $dbh->errstr();
+
+print "#",join(",",@{ $sth_filenames->{NAME} }),"\n";
+
+my $ctime_start = time();
+
+my (%files) = (
+       '.' => {
+               type => 0040,
+               mode => 0755,
+       },
+#      a => {
+#              cont => "File 'a'.\n",
+#              type => 0100,
+#              ctime => time()-2000
+#      },
+);
+
+my %dirs;
+
+while (my $row = $sth_filenames->fetchrow_hashref() ) {
+       $files{$row->{'filename'}} = {
+               size => $row->{'size'},
+               mode => $row->{'writable'} ? 0644 : 0444,
+               id => $row->{'id'} || 99,
+       };
+
+       my $d;
+       foreach (split(m!/!, $row->{'filename'})) {
+               # first, entry is assumed to be file
+               if ($d) {
+                       $files{$d} = {
+                                       size => $dirs{$d}++,
+                                       mode => 0755,
+                                       type => 0040
+                       };
+                       $files{$d.'/.'} = {
+                                       mode => 0755,
+                                       type => 0040
+                       };
+                       $files{$d.'/..'} = {
+                                       mode => 0755,
+                                       type => 0040
+                       };
+               }
+               $d .= "/" if ($d);
+               $d .= "$_";
+       }
+}
+
+print scalar (keys %dirs), " dirs:",join(" ",keys %dirs),"\n";
+
+sub filename_fixup {
+       my ($file) = shift;
+       $file =~ s,^/,,;
+       $file = '.' unless length($file);
+       return $file;
+}
+
+sub e_getattr {
+       my ($file) = filename_fixup(shift);
+       $file =~ s,^/,,;
+       $file = '.' unless length($file);
+       return -ENOENT() unless exists($files{$file});
+       my ($size) = $files{$file}{size} || 1;
+       my ($dev, $ino, $rdev, $blocks, $gid, $uid, $nlink, $blksize) = (0,0,0,1,0,0,1,1024);
+       my ($atime, $ctime, $mtime);
+       $atime = $ctime = $mtime = $files{$file}{ctime} || $ctime_start;
+
+       my ($modes) = (($files{$file}{type} || 0100)<<9) + $files{$file}{mode};
+
+       # 2 possible types of return values:
+       #return -ENOENT(); # or any other error you care to
+       #print(join(",",($dev,$ino,$modes,$nlink,$uid,$gid,$rdev,$size,$atime,$mtime,$ctime,$blksize,$blocks)),"\n");
+       return ($dev,$ino,$modes,$nlink,$uid,$gid,$rdev,$size,$atime,$mtime,$ctime,$blksize,$blocks);
+}
+
+sub e_getdir {
+       my ($dirname) = shift;
+       $dirname =~ s!^/!!;
+       # return as many text filenames as you like, followed by the retval.
+       print((scalar keys %files)." files total\n");
+       my %out;
+       foreach (keys %files) {
+               my $f = $_;
+               $f =~ s/^\E$dirname\Q//;
+               $f =~ s/^\///;
+               if ($dirname) {
+                       $out{$f}++ if (/^\E$dirname\Q/);
+               } else {
+                       $out{$f}++ if ($f =~ /^[^\/]+$/);
+               }
+               print "f: $_ -> $f\n";
+       }
+       if (! %out) {
+               $out{'no files? bug?'}++;
+       }
+       print scalar keys %out," files found for '$dirname': ",keys %out,"\n";
+       return (keys %out),0;
+}
+
+sub e_open {
+       # VFS sanity check; it keeps all the necessary state, not much to do here.
+       my ($file) = filename_fixup(shift);
+       print("open called\n");
+       return -ENOENT() unless exists($files{$file});
+       return -EISDIR() unless exists($files{$file}{id});
+       if (!exists($files{$file}{cont})) {
+               $sth_content->execute($files{$file}{id});
+               ($files{$file}{cont}) = $sth_content->fetchrow_array;
+       }
+       print("open ok\n");
+       return 0;
+}
+
+sub e_read {
+       # return an error numeric, or binary/text string.  (note: 0 means EOF, "0" will
+       # give a byte (ascii "0") to the reading program)
+       my ($file) = filename_fixup(shift);
+       my ($buf,$off) = @_;
+       return -ENOENT() unless exists($files{$file});
+       return -EINVAL() if $off > length($files{$file}{cont});
+       return 0 if $off == length($files{$file}{cont});
+       return substr($files{$file}{cont},$off,$buf);
+}
+
+sub e_statfs { return 255, 1, 1, 1, 1, 2 }
+
+# If you run the script directly, it will run fusermount, which will in turn
+# re-run this script.  Hence the funky semantics.
+my ($mountpoint) = "";
+$mountpoint = shift(@ARGV) if @ARGV;
+Fuse::main(
+       mountpoint=>$mountpoint,
+       getattr=>\&e_getattr,
+       getdir=>\&e_getdir,
+       open=>\&e_open,
+       statfs=>\&e_statfs,
+       read=>\&e_read,
+       debug=>1,
+);