[openstack-dev] [devstack] set -o nounset in devstack?

Dean Troyer dtroyer at gmail.com
Fri Dec 5 17:58:31 UTC 2014

On Fri, Dec 5, 2014 at 6:45 AM, Sean Dague <sean at dague.net> wrote:

> I got bit by another bug yesterday where there was a typo between
> variables in the source tree. So I started down the process of set -o
> nounset to see how bad it would be to prevent that in the future.


> The trueorfalse issue can be fixed if we change the function to be:
> function trueorfalse {
>     local xtrace=$(set +o | grep xtrace)
>     set +o xtrace
>     local default=$1
>     local testval="${!2+x}"
>     [[ -z "$testval" ]] && { echo "$default"; return; }

There should be an $xtrace in that return path

>     [[ "0 no No NO false False FALSE" =~ "$testval" ]] && { echo
> "False"; return; }
>     [[ "1 yes Yes YES true True TRUE" =~ "$testval" ]] && { echo "True";
> return; }
>     echo "$default"
>     $xtrace
> }
> FOO=$(trueorfalse True FOO)
> ... then works.

I'm good with this.

> the -z and -n bits can be addressed with either FOO=${FOO:-} or an isset
> function that interpolates. FOO=${FOO:-} actually feels better to me
> because it's part of the spirit of things.

I think I agree, but we have a lot og is_*() functions so that wouldn't be
to far of a departure, I could be convinced either way I suppose.  This is
going to be the hard part of the cleanup and ongoing enforcement.

> So... the question is, is this worth it? It's going to have fall out in
> lesser used parts of the code where we don't catch things (like -o
> errexit did). However it should help flush out a class of bugs in the
> process.

This is going to be a long process to do the change, I think we will need
to bracket parts of the code as they get cleaned up to avoid regressions
slipping in.



Dean Troyer
dtroyer at gmail.com
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