[Bug 446552] Re: url_downloadable ignores proxy settings

[Daniel]

Just trying to update from natty (11.04) to oneiric (11.10) and having
the same problem: do-release-upgrade, started from console, hangs.
http_proxy set, but Proxy settings in gnome are not set. Any console
application should use http_proxy as first option

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https://bugs.launchpad.net/bugs/446552

Title:
  url_downloadable ignores proxy settings

Status in “update-manager” package in Ubuntu:
  Fix Released
Status in “update-manager” source package in Lucid:
  Fix Released
Status in “update-manager” source package in Jaunty:
  Fix Released
Status in “update-manager” source package in Karmic:
  Fix Released

Bug description:
  Binary package hint: update-manager

  TEST CASE:
  1. define a proxy server somewhere (gconf, apt.conf, synaptic)
  2.use iptables to disallow access to port 80
  3. run update-manager and click on the "upgrade" button
  4. verify that the upgrade hangs

  4. install update-manager from jaunty-proposed
  5. repeat step 3
  6. verify that it now continues

  When updating to 9.10 from from 9.04, the update-manager uses a
  utility function called "UpdateManager.Core.utils.url_downloadable".
  This function skips urllib2 - which is properly configured to use the
  proxy settings - and instead directly interacts with httplib, which
  requires the caller to properly set up the request in order to use the
  proxy.

  Changing the url_downloadable function to use the proxy resolves the
  issue.

  Specifically, I after:

    if scheme == "http":
      import httplib
      try:

  I added:

        proxy = os.getenv('http_proxy')
        if (proxy):
          path = scheme + netloc + path
          netloc = proxy

  This resolved the problem. This, however, isn't really a fix - it
  relies on the fact that init_proxy sets the http_proxy environment
  variable and ignores anything else that might set up urllib2 to
  properly use a proxy server.

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