[GitHub] alexkli opened a new issue #2837: [cli] Support reading param.json from stdin

[gi...@git.apache.org]

alexkli opened a new issue #2837: [cli] Support reading param.json from stdin
URL: https://github.com/apache/incubator-openwhisk/issues/2837
 
 
   It would be useful to support reading a parameter json file from stdin for various piping scenarios, using the convention of "-" as filename:
   
       cat some.json | envsubst | wsk action invoke my-action -P -
   
   In this example we can leverage `envsubst` to replace some environment variables in the file. Without being able to read from stdin, one has to push the content into create a temporary file, invoke and then delete the temp file again.
   
   From looking at the go cli code, it seems `readFile()` in [util.go](https://github.com/apache/incubator-openwhisk/blob/26146368f1dd07f817062e662db64c73a8d486d6/tools/cli/go-whisk-cli/commands/util.go#L829) could be adapted to leverage `ioutil.ReadAll(os.Stdin)` in case `filename == "-"`. One probably has to check if that is ok for all other `readFile()` usages, or if that should be a special option reserved for `-P --param-file` only.
 
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