.
Bitland.Net Security Notes            Comments? email jwilkins-at-bitland*net
More information on the author at Jonathan Wilkins's home page
RSS feed available at http://www.bitland.net/index.rss               Add to Google
Archives: 2007, 2006, 2005, 2004, 2003, 2002, 2001, 2000
Capistrano 2 can handle different usernames on different hosts  |  (2008/05/12 22:16)

Sometimes you'll want to deploy to different servers with different usernames. I googled around and didn't find a clean solution, though Matthew Deiters had a reasonable monkey patch. I'm not sure if this is a recent addition to the underlying Net::SSH library but I checked to see if the standard ssh configuration file was obeyed and it turns out that it is. All you have to do is add an entry like the following to your ~/.ssh/config file. 
Host your.host.name
  HostName your.host.name
  User username


+digg  |  +del.icio.us   |    [Ruby ]   |   Permanent link
Quick Proxy, or Why I Love Ruby pt 9215  |  (2008/02/02 12:00) 

# Quick basic proxy, just strips accept-encoding header and dumps
# to files in the local directory using the WebScarab naming convention
# (0-request, 0-response ...)
require 'net/http'
require 'webrick/httpproxy'

s = WEBrick::HTTPProxyServer.new(
  :Port => 9999, 
  :RequestCallback => Proc.new{|req,res| 
    $count ||= 0
    req.header.delete('accept-encoding')
    open("#{$count}-request", "wb+") { |f|
      f << "#{req.request_line}#{req.raw_header}\r\n#{req.body}"
    }
  },
  :ProxyContentHandler => Proc.new{|req,res|
    open("#{$count}-response", "wb+") { |f|
      f << res.status_line
      res.header.keys.each { |k|
        f << "#{k.capitalize}: #{res.header[k]}\r\n"
      }
      f << "\r\n#{res.body}"
    }
    $count += 1
  }
);
trap("INT"){
  s.shutdown
}
s.start


+digg  |  +del.icio.us   |    [Ruby ]   |   Permanent link
Ruby's equivalent of Python's setattr  |  (2007/09/17 17:52)

I am still really new to Ruby but I'm jumping in with both feet. As a result I figured out metaprogramming before I knew what the ! operator did. Anyway, I was trying to find out the equivalent of Python's setattr when I came across Hal Fulton's 'An Exercise in Metaprogramming with Ruby'. That and some hints from a ruby-talk thread on attr_accessor allowed me to translate this Python code I'd written for dealing with MySpace profiles from: 
print "Getting Profile Nodes.."
for p in ['ProfileMusic', 'ProfileGeneral', 'ProfileBooks', 'ProfileHeroes']:
  try:
    v = self.soup.first('td',id=p).string
    setattr(self, p, v)
  except:
    setattr(self, p, None)
Into this Ruby: 
(page/"td").each do |t|
  tid = t.attributes['id']
  if /Profile([.]*)/ =~ tid
    pname = tid[7..-1].downcase
    pname = pname.gsub(/[ \/]/, "_").gsub(/[^\w]/, "").squeeze('_')
    instance_variable_set("@"+pname, t.inner_html)
    eval("class << self; attr_accessor :#{pname}; end")
  end
end
The Ruby uses Hpricot instead of BeautifulSoup, but is more generalized and OOish. I'm a little uncomfortable with the security of the eval, but the technique is useful and I couldn't google a better solution. If you have something better, let me know.
+digg  |  +del.icio.us   |    [Ruby ]   |   Permanent link
RSS feed available at http://www.bitland.net/index.rss