[pony-build] Making virtualenv Fail

[Max Laite]

Very helpful. Thanks. Will report back when I sit down to mess around with
it later.

Max

On Wed, Feb 10, 2010 at 12:25 PM, Rosangela Canino-Koning <
rosiec at voidptr.net> wrote:

> Backing up, how much of a failure do you want? Do you want this thing to
> messily grind to a halt, or do you want it to try to deal with the error
> somewhat gracefully?
>
> If pip failing to install a dependency is a massive deal-breaker for the
> whole system, which, further, you never really expect to happen, but you
> don't want it to fail silently, use an assert.
>
> If pip failing to install a dependency is a rare error, but you need to
> clean up after yourself at a higher level before shutting down, then throw
> an exception, and catch it upstream.
>
> Finally, if pip failing is an expected part of the program flow, and there
> are ways to gracefully handle the error, and continue processing, then check
> pip's return status (or catch it if it's an exception), do whatever, and
> continue processing.
>
> Any of these strategies can be implemented with either pip returning a
> status code, or with pip throwing an exception. It's what you do with it
> that really matters.
>
> -rose
>
>
> On Wed, Feb 10, 2010 at 11:14 AM, C. Titus Brown <ctb at msu.edu> wrote:
>
>> subprocess returncode/status code == 0 => success
>>
>> On Wed, Feb 10, 2010 at 11:13:20AM -0500, Rosangela Canino-Koning wrote:
>> > Asserts are typically the preferred method for this. What kind of error
>> does
>> > pip return (or throw?) if it fails to install?
>> >
>> > -rose
>> >
>> > On Wed, Feb 10, 2010 at 10:50 AM, Max Laite <mlaite at gmail.com> wrote:
>> >
>> > > I been thinking on some stuff to make virtualenv fail if pip can not
>> > > install a dep. I have a few ideas, but the easiest would be to use a
>> simple
>> > > try block. I wanted to pass it by you guys to see if I am missing
>> something
>> > > in my thought process behind this.
>> > >
>> > > The other way was to catch the output from pip and parse for failed or
>> > > something like that.
>> > >
>> > > Max
>> > >
>> > > _______________________________________________
>> > > pony-build mailing list
>> > > pony-build at lists.idyll.org
>> > > http://lists.idyll.org/listinfo/pony-build
>> > >
>> > >
>>
>> > _______________________________________________
>> > pony-build mailing list
>> > pony-build at lists.idyll.org
>> > http://lists.idyll.org/listinfo/pony-build
>>
>>
>> --
>> C. Titus Brown, ctb at msu.edu
>>
>
>
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