bitbake-diffsigs fixes/improvements

As part of an effort to add task signature recording and comparison to buildhistory in OE, I went digging into bitbake-diffsigs and the code that supports it and discovered that unfortunately it had a number of bugs - in particular the -t option despite being around for a while and having numerous band-aids applied in the past still wasn't really working properly. I have to take a big chunk of the responsibility for this as I wrote the thing in the first place. This patchset corrects most of the issues that I found and also makes a number of improvements to the readability of the output.

NOTE: there are a few corresponding changes required in OE-Core that I am about to send out, these should be applied at the same time.

The following changes since commit 751c9dc51fd01fa64a1ff37ba2638110335f71af:

fetch/local: Drop FILESDIR (2017-04-05 09:38:01 +0100)

are available in the git repository at:

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

Paul Eggleton (11):
bitbake-diffsigs: fix -t picking wrong files to compare lib/bb/siggen: add missing path separator to cleaned paths
bitbake-diffsigs: properly report which signature is missing
bitbake-diffsigs: drop naive logic for removing duplicate files lib/bb/siggen: show a diff when dumping changes to multi-line values lib/bb/siggen: don't show unchanged runtaskdeps list
bitbake-diffsigs: change to use argparse
bitbake-diffsigs: add an option to find and compare specific signatures lib/bb/siggen: add collapsed mode to compare_sigfiles() lib/bb/siggen: show word-diff for single-line values containing spaces
bitbake-diffsigs: colourise output

 LICENSE                    |   2 +
 bin/bitbake-diffsigs       | 175 +++++++++++++++++++++------------------
 lib/bb/siggen.py           | 166 +++++++++++++++++++++++++++++--------
 lib/simplediff/LICENSE     |  22 +++++
 lib/simplediff/__init__.py | 198 +++++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 453 insertions(+), 110 deletions(-)
 create mode 100644 lib/simplediff/LICENSE
 create mode 100644 lib/simplediff/__init__.py

2.9.3