skaffold init --analyze --XXenableJibInit never exits if JDK not installed

[j-windsor]

Expected behavior

command exits not showing jib build as an option

Actual behavior

command never exits

Information

• Skaffold version: v1.20.0
• Operating system: macOS 11.2 (M1 mac)
• Installed via: Cloud Code

Steps to reproduce the behavior

1. ensure JDK is not installed
2. open Cloud Code java hello world sample.
3. run skaffold init --analyze --XXenableJibInit
4. wait a long time...

[briandealwis]

Noticed in #5380 too. This isn't easily detectable as /usr/bin/java exists. I suppose we could see if JAVA_HOME is set, and otherwise run java -version and see if it fails.

[j-windsor]

Yeah I ran into this issue while testing on M1 Mac and could repro on Intel Mac. The stalling skaffold init causes the Cloud Code skaffold setup UI to stall out and it is unusable. It also stalls out on skaffold debug or skaffold dev when Jib is selected as the builder but JDK is not installed.