RFC Task progress reporting

I've often thought it would be nice if we could print progress information for individual tasks so that you could get some idea of whether the task is doing anything and how much longer it might take, and so I've been working on a set of patches to implement just that in the background for a while now and this is the result. Unfortunately this isn't necessarily practical to do for all tasks, but things like do_fetch are running processes that do output progress information so it's not too hard to tap into that and present it in the form of a progress bar next to the task, which is what this patchset does. I was also able to enable progress for do_compile in recipes that use cmake (since that outputs % complete as it runs) as well as do_rootfs where it has a number of internal steps that can be counted and weighted.

Note that this patchset is on top of Poky because there are changes required in both BitBake and OE-Core. However, for those that prefer BitBake + OE-core separately I have pushed a paule/progress-bb branch to poky-contrib (on top of bitbake master) and paule/progress-oecore to openembedded-core-contrib on top of openembedded-core master containing the same changes - ensure you have both if you go down this route.

I have contemplated and even prototyped going a step further and using the count of lines in the output to track progress for *all* long-running tasks, which does work reasonably well - the caveat is you actually need the expected line count ahead of time for each task, so you have to be able to get that from somewhere. I haven't worked out a practical means of delivering that, suggestions would be very much welcome - my prototype stuff is on poky-contrib paule/progress-wip and relies on someone profiling a build containing all the tasks beforehand and that information somehow being made available to everyone else.

Anyway, please let me know what you think.

Please review the following changes for suitability for inclusion. If you have any objections or suggestions for improvement, please respond to the patches. If you agree with the changes, please provide your Acked-by.

The following changes since commit 7ca60ec8bff7656b4e52f5a4d238913e851da089:

test-empty-image: Fix LIC_FILES_CHKSUM typo (2016-05-06 10:48:06 +0100)

are available in the git repository at:

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

Paul Eggleton (6):
knotty: import latest python-progressbar
lib: implement basic task progress support
fetch2: implement progress support bitbake.conf: whitelist progress varflag classes/cmake: enable progress for do_compile classes/image: implement progress support for do_rootfs

 bitbake/lib/bb/build.py                           | 143 ++++++++
 bitbake/lib/bb/fetch2/__init__.py                 |   4 +-
 bitbake/lib/bb/fetch2/git.py                      |  47 ++-
 bitbake/lib/bb/fetch2/wget.py                     |  26 +-
 bitbake/lib/bb/ui/knotty.py                       |  76 ++++-
 bitbake/lib/bb/ui/uihelper.py                     |   7 +-
 bitbake/lib/progressbar.py                        | 384 ---------------------
 bitbake/lib/progressbar/LICENSE.txt               |  52 +++
 bitbake/lib/progressbar/__init__.py               |  49 +++
 bitbake/lib/progressbar/compat.py                 |  44 +++
 bitbake/lib/progressbar/progressbar.py            | 315 +++++++++++++++++
 bitbake/lib/progressbar/widgets.py                | 391 ++++++++++++++++++++++
 meta/classes/cmake.bbclass                        |   1 +
 meta/classes/image.bbclass                        |   9 +-
 meta/conf/bitbake.conf                            |   3 +-
 meta/lib/oe/rootfs.py                             | 101 +++++-
 meta/recipes-devtools/cmake/cmake-native_3.4.3.bb |   2 +
 17 files changed, 1238 insertions(+), 416 deletions(-)
 delete mode 100644 bitbake/lib/progressbar.py
 create mode 100644 bitbake/lib/progressbar/LICENSE.txt
 create mode 100644 bitbake/lib/progressbar/__init__.py
 create mode 100644 bitbake/lib/progressbar/compat.py
 create mode 100644 bitbake/lib/progressbar/progressbar.py
 create mode 100644 bitbake/lib/progressbar/widgets.py

2.5.5