[RFC v2 0/3] PoC for isar-apt repo reusing

[Uladzimir Bely <ubely@ilbers.de>]

Currently, isar-apt repo is always rebuilt at second build when
temporary files except the repo directory were deleted.

This patchset implements proof-of-concept of reusing isar-apt
repo previously built. The idea is to check that package already
exists in the repo and early exit tasks related to fetching/building.

Such approach doesn't remove any tasks from the queue, but changes
their behvaior (early exit) in case of existing package found. 

Using this feature doesn't depend on sstate-cache and requires only
local repo from some of previous builds to exist.

Changes since v1:
- avocado test, not based on build time measure
- fixed isar-apt check in compat-arch mode

Uladzimir Bely (3):
  meta: Reuse existing local isar-apt repo in new builds
  doc: Add section for isar-apt reuse functionality
  ci: Added test for isar-apt reuse functionality

 doc/user_manual.md                  | 23 ++++++++++
 meta-isar/conf/local.conf.sample    |  4 ++
 meta/classes/dpkg-base.bbclass      |  1 +
 meta/classes/isar-apt-cache.bbclass | 69 +++++++++++++++++++++++++++++
 testsuite/cibase.py                 | 42 ++++++++++++++++++
 testsuite/cibuilder.py              |  7 ++-
 testsuite/citest.py                 | 12 +++++
 7 files changed, 157 insertions(+), 1 deletion(-)
 create mode 100644 meta/classes/isar-apt-cache.bbclass

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2.20.1