Rails - Jul 2006 - writing an email file attachment to the filesystem

I''m having some difficulty writing an email file attachment to the 
filesystem.

I have the following line in my /etc/aliases

webname: "| /usr/bin/ruby /home/webname/webapp/script/runner 
''AssetSubmitHandler.receive STDIN.read''"

Everything works up to this point, it picks up the email and tries to 
process it.

When I go to write the file using (in my AssetSubmitHandler class):

File.open(base_dir+asset.path,File::CREAT|File::TRUNC|File::WRONLY,0666){ 
|f|
  f.write(attachment.read)
}

I get the following error:

/usr/lib/ruby/gems/1.8/gems/rails-1.1.2/lib/commands/runner.rb:27:
/home/webname/webapp/script/../config/../app/models/asset_submit_handler.rb:20:in
`initialize'': Permission denied -
/home/webname/public_html/assets/1153841511581165.gif (Errno::EACCES)

pwd: /home/webname/www
ls -la: drw-rw-rw-   2 webname webname 4096 Jul 18 15:17 assets/



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