[Bug 1672436] Re: Add an official hook API

[Łukasz Zemczak]

** Also affects: ubuntu-image (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1672436

Title:
  Add an official hook API

Status in Ubuntu Image:
  Fix Committed
Status in ubuntu-image package in Ubuntu:
  New

Bug description:
  Currently, to hook into the u-i build process, you have to use the
  --thru, --until, and --resume options to temporarily stop the state
  machine, do some out-of-band tweaking, and then resume the state
  machine to produce the image.  While darn handy, and a very useful
  debugging/testing feature, these options are very problematic for
  production.

  State machine method names and indexes are *not* considered part of
  the public API so I make no guarantees they won't change, even though
  I try not to change them arbitrarily.

  What we need instead is a collection of official build-process hooks
  and a mechanism for users to invoke them.  Such hooks *would* be part
  of the public API, with the expected backward compatibility and
  stability guarantees.

  We need to do two things: first, we need to identify the possible hook
  points where users of u-i might want to modify the image content, etc.
  They probably will not be as numerous as the number of state machine
  steps.  Second, we need to identify a machinery for actually
  specifying, locating, and running the hooks.

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