With libertyDev, project properties specified via -Px=y can't be used to resolve build gradle in child gradle invocation

[scottkurz]

RECREATE

1. Clone [email protected]:openliberty/guide-gradle-intro.git; cd guide-gradle-intro/finish
2. Change the LGP version to use a variable substitution like:

classpath "io.openliberty.tools:liberty-gradle-plugin:$lgpv"f

3. Do a successful non-dev mode command using a -P project prop:
   gradlew -Plgpv=3.4.1 libertyCreate
4. Do a similar dev mode command using a -P project prop and see it fail:
   gradlew -Plgpv=3.4.1 libertyDev

NOTES

At first, I thought, from reading #607 and looking at the fix https://github.com/OpenLiberty/ci.gradle/blob/main/src/main/groovy/io/openliberty/tools/gradle/tasks/DevTask.groovy#L1197 that only liberty.runtime.* project properties were propagated to the child dev mode gradle invocation as -P project properties.

However, this doesn't explain the fact that this works:
gradlew -Pliberty.server.bootstrapProperties.abc=123 -Pliberty.server.var.xyz=456 libertyDev, even though it seems to me that the config file translation/copying happens within the child gradle execution (within the libertyCreate task impl that runs as part of libertyDev).

So there seems to be a different behavior between making the properties available for basic resolution/evaluation of the Gradle build file (I'm probably not using the precise terms) vs. having the properties available for task implementations.

WORKAROUND

1. set the lgpv=3.4.1 in a gradle.properties file
2. use the env var convention: ORG_GRADLE_PROJECT_lgpv=3.4.1 ./gradlew libertyDev
3. The sysprop seems to get propagated too with: ./gradlew -Dorg.gradle.project.lgpv=3.4.1 libertyDev