[PATCH] [REVISED] setup.py: Workaround for missing bz2 module in IronPython

[Matt Mackall]

On Mon, 2011-05-09 at 15:19 -0400, Zachary Gramana wrote:
> # HG changeset patch
> # User Zachary Gramana <zgramana at pottsconsultinggroup.com>
> # Date 1304968616 14400
> # Node ID ea286e93febc91d47ef80acc8a6ab8f6547960e3
> # Parent  1256ac0f27b305d966a14b4b9f4e5e95d7bbf494
> setup.py: Workaround for missing bz2 module in IronPython

This patch had a bunch of weird whitespace damage, so it took me a bit
to get around to it. I've queued your fix with some minor tweaks,
thanks.

> IronPython does not provide the bz2 module on its own.  This patch skips
> importing it to allow setup to continue.
> 
> diff -r 1256ac0f27b3 -r ea286e93febc setup.py
> --- a/setup.py	Mon May 09 15:14:16 2011 -0400
> +++ b/setup.py	Mon May 09 15:16:56 2011 -0400
> @@ -4,7 +4,7 @@
>   # 'python setup.py install', or
>   # 'python setup.py --help' for more options
> 
> -import sys
> +import sys, platform
>   if not hasattr(sys, 'version_info') or sys.version_info < (2, 4, 0, 
> 'final'):
>       raise SystemExit("Mercurial requires Python 2.4 or later.")
> 
> @@ -36,11 +36,20 @@
>       raise SystemExit(
>           "Couldn't import standard zlib (incomplete Python install).")
> 
> +# The base IronPython distribution (as of 2.7.1) doesn't support bz2
>   try:
> -    import bz2
> -except:
> -    raise SystemExit(
> -        "Couldn't import standard bz2 (incomplete Python install).")
> +    isironpython = 
> platform.python_implementation().lower().find("ironpython") != -1
> +except:
> +    pass
> +else:
> +    if isironpython:
> +        print "warning: IronPython detected (skipping bz2 import)."
> +    else:
> +        try:
> +            import bz2
> +        except:
> +            raise SystemExit(
> +                "Couldn't import standard bz2 (incomplete Python 
> install).")
> 
>   import os, subprocess, time
>   import shutil
> 
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