[OE-core] [PATCH] oe-selftest: Improve BUILDDIR environment handling

[Richard Purdie]

On Thu, 2017-01-05 at 11:40 +0200, Ed Bartosh wrote:
> On Wed, Jan 04, 2017 at 11:48:53PM +0000, Richard Purdie wrote:
> > 
> > Its possible something (like bitbake/tinfoil2) may mess around with
> > the
> > environment and using the enviroment as a global variable store
> > isn't
> > particularly nice anyway.
> > 
> > This patch changes the BUILDDIR usages so that the environment
> > isn't used
> > as a global store and a global variable is used instead. Whilst
> > that
> > is still not perfect, it does avoid the current double and triple
> > backtraces
> > we're seeing where tinfoil2/bitbake has trampled the enviroment
> > leading
> > to failures of failures making debugging even harder.
> > 
> > Signed-off-by: Richard Purdie <richard.purdie at linuxfoundation.org>
> > ---
> >  scripts/oe-selftest | 19 +++++++++++++------
> >  1 file changed, 13 insertions(+), 6 deletions(-)
> > 
> > diff --git a/scripts/oe-selftest b/scripts/oe-selftest
> > index bfcea66..e166521 100755
> > --- a/scripts/oe-selftest
> > +++ b/scripts/oe-selftest
> > @@ -111,9 +111,13 @@ def get_args_parser():
> >                          help='Submit test results to a
> > repository')
> >      return parser
> >  
> > +builddir = None
> > +
> >  
> >  def preflight_check():
> >  
> > +    global builddir
> > +
> >      log.info("Checking that everything is in order before running
> > the tests")
> >  
> >      if not os.environ.get("BUILDDIR"):
> > @@ -135,7 +139,7 @@ def preflight_check():
> >      return True
> >  
> >  def add_include():
> > -    builddir = os.environ.get("BUILDDIR")
> > +    global builddir
> You don't need to use 'global' here. It's only mandatory if
> you change variable value:
> https://docs.python.org/3/reference/simple_stmts.html#the-global-stat
> ement

In this case I did it purely for readability to make it clear how we
were expecting it to work and to match the other uses. It doesn't hurt
anything afaik.

> Would it be more readable to use name in upper case: BUILDDIR?

Not sure, that isn't something we've used as a style anywhere else so
it doesn't really match any other style. Is that a python convention?

Cheers,

Richard