Forum: Ruby webrick-webdav(gem) served files are mounted only read-only

while i easily get a webdav server up an running with

  gem install webrick-webdav

and

  require 'webrick'
  require 'webrick/httpservlet/webdavhandler'

  server = WEBrick::HTTPServer.new(context.values)
  server.mount("/webdav", WEBrick::HTTPServlet::WebDAVHandler, Dir.pwd)
  ...

and can mount and read the files, i still can't actually modify any of 
the exported/mounted webdav files.

before i start diving into real problem tracking i would like to ask if 
someone of you had the same problems? i export/mount on mac os x. might 
this be a mac or a webrick-webdav problem? any tips welcomed,

have fun
dirk

Il giorno 03/nov/06, alle ore 10:11, Dirk Lüsebrink ha scritto:

>   server.mount("/webdav", WEBrick::HTTPServlet::WebDAVHandler,  
> this be a mac or a webrick-webdav problem? any tips welcomed,
>
> have fun
> dirk

Exactly, that's a Mac OS X issue: webrick-webdav supports protocol
version 1.0, while Mac OS X wants the server to support v2.0 in order
to let you write on that share.
I had the same problem as yours, but I couldn't find enough
documentation anywhere (about webrick-webdav or about the version
required by OS X) so I started reading webrick-webdav sources and
comparing the traffic dump with an apache webdav module and I found
out this version issue.
Actually I think that the only difference between 1.0 and 2.0 servers
is that the latter ones support LOCK methods, which allow to lock
files (exclusive or shared locks). I didn't need this, so I just
inherited from WebDAVHandler:

module WEBrick
   module HTTPServlet
     class WebDAVHandlerVersion2 < WebDAVHandler
       def do_OPTIONS(req, res)
         super
         res["DAV"] = "1,2"
       end
     end
   end
end

So I started using WebDAVHandlerVersion2 instead of WebDAVHandler. In
fact, on the source code of WebDAVHandler there is a commented out
'res["DAV"] = "1,2"' line...
It worked, I'm quite sure I could write to that share, but right now
it seems like it doesn't work very well with OS X: I get strange
errors when writing into a file or creating a new one.
Some time ago I wrote a page about my experiments with WebDAV, since
I couldn't find enough documentation: http://gmarrone.objectblues.net/
cgi-bin/wiki/WebDAV_-_Linux_server%2c_Mac_OS_X_client .
I summed up almost everything in this mail, but maybe you can find
something useful over there :)
It isn't up to date, though: I don't describe the errors I get now
with that solution.

Please let me know if your Mac OS X is able to write without any
error on that modified version of webrick-webdav :)

Gabriele Marrone wrote:
> Il giorno 03/nov/06, alle ore 10:11, Dirk Luesebrink ha scritto:
> 
>>   server.mount("/webdav", WEBrick::HTTPServlet::WebDAVHandler,  
>> this be a mac or a webrick-webdav problem? any tips welcomed,
...
> I had the same problem as yours, but I couldn't find enough
> documentation anywhere (about webrick-webdav or about the version
> required by OS X) so I started reading webrick-webdav sources and
> comparing the traffic dump with an apache webdav module and I found
> out this version issue.

yes, i've also found the res["DAV"] = "1,2" but uncommenting it did not 
work for me at first. but than i found the HTTPS stuff on your 
page(http://gmarrone.objectblues.net/cgi-bin/wiki/WebDAV_-_Linux_server%2c_Mac_OS_X_client) 
and i could get it to work. The strange errors you got, i had also, 
"(Error code, -50)". I guess this is because of the missing UN/LOCK 
implementation and so i tried putting an empty LOCK method in there:

class WebDAVHandlerVersion2
  def do_LOCK req, res
    puts "LOCK request: #{req}"
  end
end

and this got me rid of the the 'strange' errors.

But now, what does it mean? What is UN/LOCK actually supposed to do? 
(UNLOCK does not seem to be called at all?) Yeah, i could start looking 
it up in the RFC, but i'm sick an tired of the Webdav promise. All could 
have been so nice, when apple/microsoft/apache/etc would just have had 
implemented what is written in the RFCs an i would not need to bother, 
sigh. So, now i have a kind of working(kind of) webdav-webrick/version 
2/read&write version server. lets see what happens next when putting it 
into production use, hehe

thanx
dirk

Il giorno 07/nov/06, alle ore 23:07, Dirk Lüsebrink ha scritto:

>   def do_LOCK req, res
>     puts "LOCK request: #{req}"
>   end
> end
>
> and this got me rid of the the 'strange' errors.

Great work! :)
I didn't think about it.

> into production use, hehe
I've just given a small peek at the RFC, looks like LOCK must return
a unique "lock token", which should be a URI, associated to that lock.
I guess your empty implementation confuses Mac OS X a little bit,
which thinks the lock has succeded but isn't going to UNLOCK since it
doesn't know the lock token.

Well, I guess that's fine for a single user webdav share :)

Gabriele Marrone wrote:
> 
> Well, I guess that's fine for a single user webdav share :)

very well so! i took the time to pack the stuff and made it a gem so you 
can easily install it and serve your file directly from the the 
commandline.

http://www.sofasportler.de/dirk.blog/2007/01/01/webdav-exporter-ruby-gem-serve-files-from-the-commandline/

many thanks for your help and who knows? maybe one day we might even 
sort out the DAV2 LOCK protocol issues. Until then,

thank you and happy new year