proper way to detect shell exit code when errexit option set

Question

I prefer to write solid shell code, so the errexit & nounset is alway set.

The following code will stop at bad_command line

#!/bin/b         


        

Answer 1

Just trying to complete the following answer: https://stackoverflow.com/a/32201766/2609399 , which is a very good catch, BTW.

I've faced this limitation a time ago and applied a similar fix for it. Please consider the below code sample.

invokeBashFunction() {
  local functionExitCode="0"
  /bin/bash -c "
    set -o errexit

    ${*}
  " || functionExitCode="${?}"

  # add some additional processing logic/code

  return "${functionExitCode}"
}
export -f invokeBashFunction

And there are few example of how to use it:

invokeBashFunction bad_function param1 "param 2" param3 && echo "It passed." || echo "It failed!"

if invokeBashFunction bad_function param1 "param 2" param3
then
  echo "It passed."
fi

if ! invokeBashFunction bad_function param1 "param 2" param3
then
  echo "It failed!"
fi