[jbossts-issues] [JBoss JIRA] (JBTM-1254) Simplify narayana.sh by removing ability to have empty IPV6_OPTS

[Paul Robinson (JIRA)]

Paul Robinson created JBTM-1254:
-----------------------------------

             Summary: Simplify narayana.sh by removing ability to have empty IPV6_OPTS
                 Key: JBTM-1254
                 URL: https://issues.jboss.org/browse/JBTM-1254
             Project: JBoss Transaction Manager
          Issue Type: Feature Request
      Security Level: Public (Everyone can see)
            Reporter: Paul Robinson
            Assignee: Paul Robinson
             Fix For: 4.17.0, 5.0.0.M2


We currently use [ -z "${VAR+c}" ] notation to detect if a variable has been set, allowing for it being set to the empty string. Here's an example:

{code}
  # if IPV6_OPTS is not set get the jdbc drivers (we do not run the jdbc tests in IPv6 mode)
  [ -z "${IPV6_OPTS+x}" ] && ant -DisIdlj=$IDLJ "$QA_BUILD_ARGS" get.drivers dist ||
    ant -DisIdlj=$IDLJ "$QA_BUILD_ARGS" dist
{code} 

The problem with this approach is that it's rather cryptic to understand what's going on. This makes it hard to read and easy to create a bug. We've had two bugs so far, due to this syntax.

By removing the ability to "export IPV6_OPTS=", we can simplify these portions of the script to look like:

{code}
if [ "${IPV6_OPTS}" = "" ]; then
	ant -DisIdlj=$IDLJ "$QA_BUILD_ARGS" get.drivers dist
else
	ant -DisIdlj=$IDLJ "$QA_BUILD_ARGS" dist
fi
{code}

Which is a lot easier to read and much less error-prone.

Should we ever need to enable IPv6 without setting any IPv6 options, we could either re-instate the old code, or set a dummy option. 

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