lib/ID3FS/Fuse.pm

   1 package ID3FS::Fuse;
   2
   3 use strict;
   4 use warnings;
   5 use ID3FS::Path;
   6 use Fuse;
   7 use Cwd;
   8 use POSIX qw(EINVAL EROFS ENOENT EOPNOTSUPP S_IRUSR S_IRGRP S_IROTH S_IXUSR S_IXGRP S_IXOTH);
   9
  10 our ($TYPE_DIR, $TYPE_SYMLINK)=(0040, 0120);
  11 our $DEFAULT_MAXTAGDEPTH = 15;
  12 sub new
  13 {
  14     my $proto=shift;
  15     my $class=ref($proto) || $proto;
  16     my $self={};
  17     bless($self,$class);
  18
  19     $self->{db}=shift;
  20     $self->{source}=shift;
  21     $self->{mountpoint}=Cwd::abs_path(shift);
  22     $self->{verbose}=shift;
  23     $self->{tagdepth}=shift;
  24     $self->{tagdepth}=$DEFAULT_MAXTAGDEPTH unless($self->{tagdepth});
  25     $self->{perms} = S_IRUSR() | S_IXUSR() | S_IRGRP() | S_IXGRP() | S_IROTH() | S_IXOTH();
  26
  27     return $self;
  28 }
  29
  30 sub run
  31 {
  32     my($self)=@_;
  33     Fuse::main(
  34         mountpoint  => $self->{mountpoint},
  35         threaded    => 0,
  36         debug       => ($self->{verbose} > 1),
  37         mountopts   => "allow_other,ro",
  38         getattr     => sub { $self->getattr(@_); },
  39         readlink    => sub { $self->readlink(@_); },
  40         getdir      => sub { $self->getdir(@_); },
  41
  42         # Not used
  43 #       mknod       => sub { $self->mknod(@_);       },
  44 #       mkdir       => sub { $self->mkdir(@_);       },
  45 #       unlink      => sub { $self->unlink(@_);      },
  46 #       rmdir       => sub { $self->rmdir(@_);       },
  47 #       symlink     => sub { $self->symlink(@_);     },
  48 #       rename      => sub { $self->rename(@_);      },
  49 #       link        => sub { $self->link(@_);        },
  50 #       chmod       => sub { $self->chmod(@_);       },
  51 #       chown       => sub { $self->chown(@_);       },
  52 #       truncate    => sub { $self->truncate(@_);    },
  53 #       utime       => sub { $self->utime(@_);       },
  54 #       open        => sub { $self->open(@_);        },
  55 #       read        => sub { $self->read(@_);        },
  56 #       write       => sub { $self->write(@_);       },
  57 #       statfs      => sub { $self->statfs(@_);      },
  58 #       release     => sub { $self->release(@_);     },
  59 #       fsync       => sub { $self->fsync(@_);       },
  60 #       setxattr    => sub { $self->setxattr(@_);    },
  61 #       getxattr    => sub { $self->getxattr(@_);    },
  62 #       listxattr   => sub { $self->listxattr(@_);   },
  63 #       removexattr => sub { $self->removexattr(@_); },
  64         );
  65 }
  66
  67 sub getattr
  68 {
  69     my($self, $filename)=@_;
  70 #    print "**GETATTR: $filename\n";
  71     my $path=ID3FS::Path->new($self->{db}, $filename, $self->{verbose}, $self->{tagdepth});
  72     my $last_update=$self->{db}->last_update();
  73     return(-ENOENT()) unless($path->isvalid());
  74     my($dev,$ino,$nlink)=(0,0,1);
  75     my $uid=$<;
  76     my $gid=(split(/ /, $( ))[0];
  77     my($rdev,$size)=(0,1);
  78     my($atime,$mtime,$ctime)=($last_update) x 3;
  79     my($blksize,$blocks)=(512,1);
  80     my $mode=$self->mode( $path->isdir() ? $TYPE_DIR : $TYPE_SYMLINK );
  81     return($dev, $ino, $mode, $nlink, $uid, $gid, $rdev, $size,
  82            $atime, $mtime, $ctime, $blksize, $blocks);
  83 }
  84
  85 sub readlink
  86 {
  87     my($self,$filename)=@_;
  88 #    print "**READLINK: $filename\n";
  89     my $path=ID3FS::Path->new($self->{db}, $filename, $self->{verbose}, $self->{tagdepth});
  90     return(-EINVAL()) unless($path->isfile());
  91     return $path->dest($self->{mountpoint});
  92 }
  93
  94 sub getdir
  95 {
  96     my($self, $filename)=@_;
  97 #    print "**GETDIR: $filename\n";
  98     my $path=ID3FS::Path->new($self->{db}, $filename, $self->{verbose}, $self->{tagdepth});
  99     return(-ENOENT()) unless($path->isvalid());
 100     return(-ENOTDIR()) unless($path->isdir());
 101     my @dents=();
 102     my($dirs, $files)=$path->dirents();
 103     # too slow
 104 #    push(@dents, $path->filter(@$dirs));
 105     push(@dents, @$dirs);
 106     push(@dents, @$files);
 107     if(@dents)
 108     {
 109         return( (".", "..", @dents, 0) );
 110     }
 111     return(0);
 112 }
 113
 114 # unused stubs
 115 sub mknod       { print "FUSE: mknod\n";       return -EROFS();      }
 116 sub mkdir       { print "FUSE: mkdir\n";       return -EROFS();      }
 117 sub unlink      { print "FUSE: unlink\n";      return -EROFS();      }
 118 sub rmdir       { print "FUSE: rmdir\n";       return -EROFS();      }
 119 sub symlink     { print "FUSE: symlink\n";     return -EROFS();      }
 120 sub rename      { print "FUSE: rename\n";      return -EROFS();      }
 121 sub link        { print "FUSE: link\n";        return -EROFS();      }
 122 sub chmod       { print "FUSE: chmod\n";       return -EROFS();      }
 123 sub chown       { print "FUSE: chown\n";       return -EROFS();      }
 124 sub truncate    { print "FUSE: truncate\n";    return -EROFS();      }
 125 sub utime       { print "FUSE: utime\n";       return -EINVAL();     }
 126 sub open        { print "FUSE: open\n";        return -EINVAL();     }
 127 sub read        { print "FUSE: read\n";        return -EINVAL();     }
 128 sub write       { print "FUSE: write\n";       return -EROFS();      }
 129 sub statfs      { print "FUSE: statfs\n";      return -EINVAL();     }
 130 sub release     { print "FUSE: release\n";     return 0;             }
 131 sub fsync       { print "FUSE: fsync\n";       return 0;             }
 132 sub setxattr    { print "FUSE: setxattr\n";    return -EOPNOTSUPP(); }
 133 sub getxattr    { print "FUSE: getxattr\n";    return -EOPNOTSUPP(); }
 134 sub listxattr   { print "FUSE: listxattr\n";   return -EOPNOTSUPP(); }
 135 sub removexattr { print "FUSE: removexattr\n"; return -EOPNOTSUPP(); }
 136
 137 sub mode
 138 {
 139     my($self, $type)=@_;
 140     return(($type << 9) | $self->{perms});
 141 }
 142
 143 1;