From: Kent Sibilev <ksruby@...>
Date: 2005-10-30T05:37:07+09:00
Subject: Re: [ANN] FuseFS-0.5

Sorry for replying to my previous email. With this patch applied, here
is the simple implementation (less than 100 lines of code) of Ruby
remote filesystem using DRb.

server.rb:
#!/usr/bin/env ruby

require 'drb'

class RemoteDirectory
  def initialize(dir)
    @dir = dir
    @files = {}
  end

  def contents(path)
    Dir[File.join(@dir, path,'*')].map{|fn| File.basename fn}
  end

  %w|file? directory? executable? size delete|.each do |name|
    define_method(name) do |path|
      File.send name, File.join(@dir, path)
    end
  end

  %w|mkdir rmdir|.each do |name|
    define_method(name) do |path|
      Dir.send name, File.join(@dir, path)
    end
  end

  %w|can_write? can_delete? can_mkdir? can_rmdir?|.each do |name|
    define_method(name) do |path|
      true
    end
  end

  def raw_open(path, mode)
    return true if @files.has_key? path
    @files[path] = File.open(File.join(@dir, path), mode)
    return true
  rescue
    puts $!
    false
  end

  def raw_read(path, off, size)
    file = @files[path]
    return unless file
    file.seek(off, File::SEEK_SET)
    file.read(size)
  rescue
    puts $!
    nil
  end

  def raw_write(path, off, sz, buf)
    file = @files[path]
    return unless file
    file.seek(off, File::SEEK_SET)
    file.write(buf[0, sz])
  rescue
    puts $!
  end

  def raw_close(path)
    file = @files[path]
    return unless file
    file.close
    @files.delete path
  rescue
    puts $!
  end
end

if $0 == __FILE__
  dir = RemoteDirectory.new ARGV.shift || '.'
  uri = ARGV.shift || 'druby://0.0.0.0:7777'
  DRb.start_service uri, dir
  puts DRb.uri
  DRb.thread.join
end

rubyfs.rb:
#!/usr/bin/env ruby

require 'drb'
require 'fusefs'

unless (1..2).include? ARGV.size
  puts "Usage: #$0 <directory> <uri>"
  exit(1)
end

dir = ARGV.shift
uri = ARGV.shift || 'druby://0.0.0.0:7777'

DRb.start_service(nil, nil)
root = DRbObject.new_with_uri(uri)

FuseFS.set_root(root)
FuseFS.mount_under(dir)
FuseFS.run

Now I don't have to use samba in order to access files on my Windows
workstation! :)

Cool.
Kent.

On Sun, 2005-10-30 at 05:18 +0900, Kent Sibilev wrote:
> Thank you. 
> 
> I've been playing with new raw API and I've found it somewhat broken.
> Please consider this diff:
> 
> RCS file: /var/cvs/fusefs/fusefs/ext/fusefs_lib.c,v
> retrieving revision 1.9
> diff -u -r1.9 fusefs_lib.c
> --- fusefs_lib.c        15 Oct 2005 21:48:03 -0000      1.9
> +++ fusefs_lib.c        29 Oct 2005 20:07:03 -0000
> @@ -637,7 +637,7 @@
> 
>      newfile->next = opened_head;
>      opened_head = newfile;
> -    return 1;
> +    return 0;
>    }
>    debug(" no.\n");
> 
> @@ -845,7 +845,7 @@
>      /* raw read */
>      debug(" yes.\n");
>      rf_call(path,id_raw_close,Qnil);
> -    return 0;
> +    goto out;
>    }
>    debug(" no.\n");
> 
> @@ -867,6 +867,8 @@
>      }
>    }
> 
> +out:
> +
>    /* Free the file contents. */
>    if (!is_editor) {
>      if (prev == NULL) {
> @@ -1246,7 +1248,13 @@
>      VALUE args = rb_ary_new();
>      rb_ary_push(args,INT2NUM(offset));
>      rb_ary_push(args,INT2NUM(size));
> -    rf_call(path,id_raw_read,args);
> +    VALUE ret = rf_call(path,id_raw_read,args);
> +    if(ret == Qnil)
> +      return 0;
> +    StringValue(ret);
> +    if(RSTRING(ret)->len < size)
> +      size = RSTRING(ret)->len;
> +    memcpy(buf, RSTRING(ret)->ptr, size);
>      return size;
>    }
> 
> Cheers,
> Kent.
> 
> On Sat, 2005-10-29 at 16:52 +0900, Greg Millam wrote:
> > Lo, another travesty was visited upon the ruby-talk community ... and 
> > this one was named ... FuseFS 0.5!
> > 
> > --------------
> > 
> > FuseFS is a ruby module that lets you define Filesystems in ruby, so you 
> > can navigate a database. Browse virtual filesystems with ls and cd! Or 
> > even, with _why_the_lucky_stiff's railsfs.rb (included in FuseFS 0.5!) 
> > view your Ruby On Rails data on your filesystem! Do you want to know more?
> > 
> > http://redhanded.hobix.com/inspect/railsfsAfterACoupleMinutesOfToolingWithFuseWhoa.html
> > 
> > Aside from the awesome railsfs.rb and the FUSE-2.4 change, what else is 
> > included?
> > 
> > Well, remember how you couldn't get some apps to recognize a file as 
> > being anything other than empty? Well now you can correct that assumption!
> > 
> > fuseroot#size will be called on files, so when xmms tries to load your 
> > ruby-offered mp3, it'll be able to!
> > 
> > And a treat for those working with big (and I mean BIG) files that they 
> > don't want all loaded into ram:
> > 
> > "raw_open" and associated methods will allow fuseroot to receive the 
> > actual, individual read and write requests for each file, so that you 
> > can return portions of a file at a time!
> > 
> > http://rubyforge.org/projects/fusefs/
> > 
> > Happy coding!
> > 
> > - Greg
> > 
> 
>