alexkli opened a new issue #59:
URL: https://github.com/apache/openwhisk-wskdebug/issues/59
If the debug port is already used on the system, the container start will
fail and `wskdebug` will output a not-so-helpful error message:
```
Error: Command failed: docker run -d --name wskdebug-dump-1587406223576 --rm
-m 268435456 -p 8080 -p 9229:9229 -e DEBUG='wskdebug'
adobeapiplatform/adobe-action-nodejs-v10:3.0.21 node --expose-gc
--inspect=0.0.0.0:9229 app.js
```
This can actually be caused by `wskdebug` itself if a previous run failed to
properly shutdown the container.
A better error message and even handling would be possible:
1. (basic) check if the port is already in use on the local system before
starting the container and if yes, show an error message "debug port 1234
already in use"
2. (nicer) if positive, check if a docker container from wskdebug is the one
with the open port:
1. we should add the fully qualified action name as a [label on the
container](https://docs.docker.com/engine/reference/commandline/run/#set-metadata-on-container--l---label---label-file):
`wskdebug-action=/namespace/package/action`
2. if it's the same action then log a note, kill it and proceed
3. if it's another action, print a clear error message "debug port 1234
already in use by another wskdebug for action xyz"
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