AMiRo-OS

### check whether commands are available #######################################

# Checks whether the specified commands are available and can be executed.

#

# usage:      checkCommand [<command> <command> ...]

# arguments:  <command>

#                 Name of the command to check.

# return:     0

#                 All requested commands are available.

#             >0

#                 Number of requested commands that were not found.

#             -1

#                 No argument given.

#

function checkCommands {

  local status=0

  # return if no argument was specified

  if [ $# -eq 0 ]; then

    return -1

  fi

  # check all specified commands

  while [ $# -gt 0 ]; do

    command -v $1 &>/dev/null

    if [ $? -ne 0 ]; then

      printWarning "Command '$1' not available.\n"

      status=$((status + 1))

    fi

    shift 1

  done

  return $status

}

#             -2

#                 Error: Missing dependencies.

  # check dependencies

  checkCommands git

  if [ $? -ne 0 ]; then

    printError "Missing dependencies detected.\n"

    return -2

  fi

# return:     0

#                 No error or warning occurred.

#             1

#                 Warning: AMiRo-OS Git submodule already empty.

#             2

#                 Warning: Aborted by user.

#             -1

#                 Error: Unexpected input occurred

#             -2

#                 Error: Missing dependencies.

#

  # check dependencies

  checkCommands git

  if [ $? -ne 0 ]; then

    printError "Missing dependencies detected.\n"

    return -2

  fi