Mdthbs

I have read the getopts man page and was not able to find this use case.

I am at a loss for why getopts is not detecting any available options the second time a function is called in the same script.

As you can see from my debug echo outputs, all of the positional params $@ are present for both function calls.

In the second create_db function call, the getopts while loop is never entered, leading my variables TYPE and ENVIRON to never be set.

Any thoughts?

FUNCTION DEFINITION (create_db)

function create_db {

  local TYPE SIZE ENVIRON

  TYPE=''

  SIZE=''

  ENVIRON=''



  print_usage() {

    echo -e $"nUsage: create_db -t {mysql|redis|rabbitmq|sftp|elasticsearch} -e <environment_name> -s <size_in_GB>"

    echo "Required args: -t, -e"

    echo "Optional args: -s"

  }



  echo "@: $@"

  echo "0: $0"

  echo "1: $1"

  echo "2: $2"

  echo "3: $3"

  echo "4: $4"

  echo "5: $5"

  echo "6: $6"



  # parse flags

  while getopts 't:s:e:h' flag; do

    echo "flag: $flag"

    echo "opt: ${OPTARG}"

    case "${flag}" in

      t) TYPE="${OPTARG}" ;;

      s) SIZE="${OPTARG}" ;;

      e) ENVIRON="${OPTARG}" ;;

      h) print_usage

         exit 0 ;;

      *) print_usage >&2

         exit 1 ;;

    esac

  done

  shift "$(( OPTIND - 1 ))"



  echo "TYPE: ${TYPE}"

  echo "ENVIRON: ${ENVIRON}"



  ... DO WORK ...



}

CALLED SCRIPT (environment-setup-from-scratch.sh)

#!/bin/bash



# import functions from utils file

. "${0%/*}/environment-setup-utils.sh"



ENVIRONMENT="${1}"



create_db -t "elasticsearch" -e "${ENVIRONMENT}"

create_db -t "mysql" -e "${ENVIRONMENT}"

create_db -t "redis" -e "${ENVIRONMENT}"

TERMINAL OUTPUT

$ ./environment-setup-from-scratch.sh  sandbox





@: -t elasticsearch -e sandbox

0: ./environment-setup-from-scratch.sh

1: -t

2: elasticsearch

3: -e

4: sandbox

5:

6:

flag: t

opt: elasticsearch

flag: e

opt: sandbox

TYPE: elasticsearch

ENVIRON: sandbox





@: -t mysql -e sandbox

0: ./environment-setup-from-scratch.sh

1: -t

2: mysql

3: -e

4: sandbox

5:

6:

TYPE:

ENVIRON:

Each time you call getopts, it uses $OPTIND;

If the application sets OPTIND to the value 1, a new set of
parameters can be used: either the current positional parameters or
new arg values. Any other attempt to invoke getopts multiple times in
a single shell execution environment with parameters (positional
parameters or arg operands) that are not the same in all invocations,
or with an OPTIND value modified to be a value other than 1, produces
unspecified results.

(my emphasis). You need to reset OPTIND before you call getopts each time, perhaps here:

# ...

  # parse flags

  OPTIND=1

  while getopts 't:s:e:h' flag; do

# ...