[OE-core] [PATCH v2 1/2] scripts/oe-selftest: oe-selftest-internal wrapper scripts that isolates execution

[Patrick Ohly]

On Tue, 2017-11-14 at 10:09 -0600, Leonardo Sandoval wrote:
> On Tue, 14 Nov 2017 09:24:30 +0100
> Patrick Ohly <patrick.ohly at intel.com> wrote:
> 
> > On Mon, 2017-11-13 at 10:17 -0800,
> > leonardo.sandoval.gonzalez at linux.intel.com wrote:
> > > From: Leonardo Sandoval <leonardo.sandoval.gonzalez at linux.intel.c
> > > om>
> > > 
> > > The main idea is to isolate the oe-selftest execution so neither
> > > the
> > > current build dir nor the configuration data is touch/polluted.
> > > This
> > > approach uses a wrapper script (which is the one presented on
> > > this
> > > commit) which creates a unique directory and inside it copies all
> > > scripts and metadata, re-initializes the enviroment (re-sources
> > > oe-
> > > init-build-env) and finally launches the oe-selftest-internal
> > > (which
> > > used to be oe-selftest) command, passing command arguments to the
> > > latter.  
> > 
> > This mode of operation may or may not be desirable. Can it be made
> > optional?
> 
> good idea. However, you can call the oe-selftest-internal for the
> this purpose.

While doable, it feels wrong to rename something as "internal" and then
still expect people to call it directly.

A command line parameter for the new oe-selftest which controls this
behavior and just calls oe-selftest-internal directly when requested
feels cleaner and more discoverable.

Is oe-selftest-internal even going to be in the default PATH? It
probably shouldn't be, once it truly becomes an implementation detail.

> > In refkit CI testing, several selftests run tests on build
> > artifacts
> > (primarily the images) produced during the previous build and only
> > build them if needed, i.e. they run "bitbake some-image" and that
> > is
> > usually fast because the image already exists. Reusing sstate and
> > download dir also is important for speed.
> 
> oe-selftest creates a new build/conf folder, with the same conf files
> as the ones present in your current build/conf, so this means that
> you can set there DL_DIR and SSTATE_DIR (for example) on your main
> local.conf and these will be used by oe-selftest, effectively reusing
> these folders.

Instead of leaving it to the developer to figure this out, should the
oe-selftest have --[no-]reuse-download and --[no]-reuse-sstate options?

> > 
-- 
Best Regards, Patrick Ohly

The content of this message is my personal opinion only and although
I am an employee of Intel, the statements I make here in no way
represent Intel's position on the issue, nor am I authorized to speak
on behalf of Intel on this matter.