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bug#10866: 1.11a OSX with llvm - 3 fails, 47 skips, 3 errors, out of 285

From: P. Martin
Subject: bug#10866: 1.11a OSX with llvm - 3 fails, 47 skips, 3 errors, out of 2856 tests
Date: Sun, 11 Mar 2012 01:16:22 +0000 (GMT)

On Mar 9, 2012, Stefano Lattarini <address@hidden> wrote: 
> Thanks for getting back to me so quickly.
> On 03/10/2012 08:16 AM, P. Martin wrote:
> > 
> > On Mar 9, 2012, Stefano Lattarini <address@hidden> wrote: 
> >> Do you happen to know how one can
> >> reliably determine whether the build system is being run by HomeBrew,
> > 
> > 
> > Forgot to answer your question.  Yes, when Homebrew spawns
> > an install, it stages the files in the user's temp dir, which can change,
> > but below that you'll always see homebrew-automake.  A pwd e.g.
> > 
> >   /private/tmp/homebrew-automake-HEAD-Zk5j
> >   /private/tmp/homebrew-automake-1.11.3-5hld/automake-1.11.3
> >   /some/path/homebrew-automake-1.11.3-E4t5/automake-1.11.3
> > 
> > It's also the case that this env var will be defined with some path:
> > 
> >   HOMEBREW_BREW_FILE=/usr/local/bin/brew
> > 
> > Thanks again.
> >
> >
> I've finally found myself the list of variables expected to be set by
> homebrew; see the entry "SHELL SCRIPTS" at:
>  <https://github.com/mxcl/homebrew/wiki/External-Commands>
> So I've prepared the attached patch; can you confirm it truly solves
> the homebrew issue?
> Thanks,
>   Stefano

Thank you, but that patch doesn't work because HOMEBREW_CELLAR
is not an environment variable, it's an internal variable from a function.

Your have a few options:
* run ps and grep for brew install automake
* check your pwd, because it will have homebrew-automake in it.
* check if the ENV var HOMEBREW_BREW_FILE is set

This is what I did when I went to answer your question.
I looked at the output of `man brew` to see what ENV vars
the user could set which would confuse your analysis.  I also
started a `brew install automake` and went to a shell to see
what ENV variables actually get set.  Your choices pretty much
boil down to the ones I listed above.

Here is `man brew` :  https://gist.github.com/2014219
The ENVIRONMENT section lists things the user can set.
Those... not so good.

Here is `ps` from within `brew install automake`
Here is `pwd` from withing `brew install automake`
Here is `set` within a `brew install automake`
Also included the output if `brew install --HEAD automake`


Question.  Why does it search for ChangeLog if that file
doesn't exist in head?  Or is it searching thru ChangeLog*?
It's like you're trying to detect homebrew rather than deal
with the file not existing.  I must be missing something.

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