Refactoring + improve bitbake-diffsigs

Refactor out a class which can be used as the basis for bitbake-based utilities, and use it to improve bitbake-diffsigs to enable easily specifying a recipe and task and determine what the difference was in the signature data between the last two executions.

This change requires some support code within the metadata (since BitBake itself knows nothing about the implementation of shared state); a patch to implement this in OE-Core has been sent to the OE-Core mailing list.

Note that this is similar in spirit but does not directly overlap with Robert's bitbake-whatchanged script - that allows you to determine what will be done before it happens, whereas this tool is useful for determining why a rebuild occurred afterwards.

The following changes (against poky, but apply cleanly with -p2 against bitbake master) are available in the git repository at:

git://git.yoctoproject.org/poky-contrib paule/bbdiffsigs
http://git.yoctoproject.org/cgit.cgi/poky-contrib/log/?h=paule/bbdiffsigs

Paul Eggleton (5):
tinfoil: create simple interface for bitbake-based utilities lib/bb/siggen: replace tabs with spaces
lib/bb/siggen.py: insert a colon between class and recipe name lib/bb/siggen.py: make signature dump/compare functions return a list
bitbake-diffsigs: allow specifying task & follow deps recursively

 bitbake/bin/bitbake-diffsigs |   96 ++++++++++++++++++++++++++-
 bitbake/bin/bitbake-dumpsig  |    4 +-
 bitbake/bin/bitbake-layers   |  146 ++++++++++++++----------------------------
 bitbake/lib/bb/siggen.py     |  109 +++++++++++++++++--------------
 bitbake/lib/bb/tinfoil.py    |   98 ++++++++++++++++++++++++++++
 5 files changed, 301 insertions(+), 152 deletions(-)
 create mode 100644 bitbake/lib/bb/tinfoil.py

1.7.9.5