Improvement: Verify that tar is available

[gunnarmorling]

I just tried to use SDKMan on a fresh Linux install, and it would keep failing on me with this message:

Download has failed, aborting!

Enabling debug logging didn't provide any further insight about the cause. Only when inspecting the post-install hook, I realized that the issue was that the tar command wasn't available on this environment yet.

[marc0der]

Ah, good catch! That's because tar is only used in the installation hooks, not in the CLI. I'd be happy to have it added it to the install script as a pre-requisite. If you feel up to it, you could even contribute that change yourself over here:
https://github.com/sdkman/sdkman-hooks/blob/master/app/views/includes/sanity.scala.txt

[gunnarmorling]

Sure thing: sdkman/sdkman-hooks#62