[Feature]: Flag to force non-zero exit status if any variable failed.

[TonyB9000]

Is your feature request related to a problem?

As e3sm_to_cmip is designed to accept a list of variables to cmorize, the default behavior was to continue onward even if a variable failed, and eventually return a 0 status. This would prevent a calling process from knowing to exit itself when e3sm_to_cmip failed for a cmorizing failure.

At minimum, the app needs to return non-zero if any variable failed, Optionally, a flag to force an exit when any variable failed.

Describe the solution you'd like

One or two optional command line flags:

• error-on-var-failure: Ensure a non-zero status is returned after all variables are processed, if any one of them failed.
• exit-on-var-failure: Force application to exit ASAP when any variable failure is encountered.

Describe alternatives you've considered

An alternative that is cleaner, although technically alters behavior, is to default to returning 0 unless ALL variables failed. This would obviate the need for a new command line flag, yet serve perfectly for the use-cases where only a single variable is supplied for cmorizing. No "special "early exit option" would be applied, as only one variable is being processed.

Additional context

No response

[TonyB9000]

@tomvothecoder I thought I'd post this with the appropriate issue (for once).

Presently, because e2c is designed to run multiple variables in parallel, it returns a 0 (zero) exit status, even if some variables failed to be cmorized. In fact, I believe it will return 0 even if ALL variables failed.

As different use-cases might prefer different behaviors here (and with an eye to retaining legacy behavior) I propose to apply a command-line flag, "--exit-on-var-error" (with non-zero status) as an option.

An alternative that is cleaner, although technically alters behavior, is to default to returning 0 unless ALL variables failed. This would obviate the need for a new command line flag, yet serve perfectly for the use-cases where only a single variable is supplied for cmorizing.