Add a verification check when a new GAE runtime is created

[nbashirbello]

When creating an app-tools-lib-for-java runtime, there is no check that the cloud sdk exists on the system (that we have a valid path to the cloud sdk install). This step is done when the user attempts to run/debug the runtime (check is done CloudSdk.Builder#build).

Should we be calling PathResolver.INSTANCE.getCloudSdkPath() to check that is returns a path when a new runtime is created? If we do this, the user can input the path if we didn't find it or prompt the user to install gcloud if they dont have it.

[nbashirbello]

@elharo @briandealwis

[elharo]

How would this affect he new project wizard which creates a (possibly invalid) runtime?

[nbashirbello]

We could have the check in the new project wizard too. If we cannot resolve the location of the cloud sdk (that is after the path resolver and after prompting the user for the location), the new project creation will fail. My thought is you cannot use the App Engine features without the cloud sdk and user can always create a dynamic web module and install the facet later after they install cloud sdk.

[briandealwis]

@nbashirbello use CloudSdkPrompter — it does what you're looking for.

[elharo]

@nbashirbello Is this now done and/or obsolete?

[nbashirbello]

This bug still exists. I will work on it