[Blueprint servercloud-q-apt-improvements] Apt Improvements

[Robie Basak]

Blueprint changed by Robie Basak:

Whiteboard changed:
  Etherpad: http://pad.ubuntu.com/uds-q-servercloud-q-apt-improvements
  Blueprint: https://blueprints.launchpad.net/ubuntu/+spec/servercloud-q-apt-improvements
  Proposed spec: https://wiki.ubuntu.com/AptByHash
  Discussion: https://lists.ubuntu.com/archives/ubuntu-devel/2012-July/035487.html
  
  = User Stories =
   * Jim is using JuJu, and adds a node.  He does not want to see apt fail due to a race condition.
   * Marley is using the Ubuntu installer for network based installs against a local mirror that is updated from a remote mirror.  He does not want installs to fail due to the mirror being updated.
   * Sally wants to use a http proxy to cache deb downloads and does not want to be vulnerable to caching mismatched files that would cause apt failures.
  
  = Assumptions =
  None
  
  = Test Plans =
  Test will be conducted in 2 ways:
   a.) implied test: much of our automated infrastructure relies on apt and previously failed quite commonly due to apt.  These errors should be erased.
   b.) explicit test: we should ideally have some canary that would ensure our public mirrors do not fail. One example starting point is [1]
     [1] https://code.launchpad.net/~smoser/+junk/check-archive/
  
  = Release Note =
  Ubuntu's public mirrors now contain an improved archive format.  Coupled with updates to apt transient apt-update errors are a thing of the past.
+ 
+ Note: feature freeze is upon us, and I think this work is too invasive
+ for an FFe. My priorities mean that I can't work on this for the next
+ few weeks, so it looks like this will have to slip to R.

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Apt Improvements
https://blueprints.launchpad.net/ubuntu/+spec/servercloud-q-apt-improvements