miscellaneous additions to build container

- can work with podman
- added required packages
- allow using an apt proxy
Signed-off-by: Josua Mayer <josua@solid-run.com>

README.md

@@ -16,12 +16,19 @@ A docker image providing a consistent build environment can be used as below:
 1. build container image (first time only)
    ```
    docker build -t lx2160a_build docker
+   # optional with an apt proxy, e.g. apt-cacher-ng
+   # docker build --build-arg APTPROXY=http://127.0.0.1:3142 -t lx2160a_build docker
    ```
 2. invoke build script in working directory
    ```
-   docker run -i -t -v "$PWD":/work lx2160a_build $(id -u) $(id -g)
+   docker run -i -t -v "$PWD":/work lx2160a_build -u $(id -u) -g $(id -g)
    ```
 
+### rootless Podman
+
+Due to the way podman performs user-id mapping, the root user inside the container (uid=0, gid=0) will be mapped to the user running podman (e.g. 1000:100).
+Therefore in order for the build directory to be owned by current user, `-u 0 -g 0` have to be passed to *docker run*.
+
 ## Build with host tools
 Simply running ./runme.sh will check for required tools, clone and build images and place results in images/ directory.
 
@@ -41,7 +48,7 @@ Selecting boot loader - *BOOT_LOADER=u-boot,uefi*
 
 ### Examples:
 - `./runme.sh` **or**
-- `docker run -i -t -v "$PWD":/work lx2160a_build $(id -u) $(id -g)`
+- `docker run -i -t -v "$PWD":/work lx2160a_build -u $(id -u) -g $(id -g)`
 
 generates *images/lx2160acex7_2000_700_3200_8_5_2.img* which is an image ready to be deployed on micro SD card and *images/lx2160acex7_xspi_2000_700_3200_8_5_2.img* which is an image ready to be deployed on the COM SPI flash.
 

docker/Dockerfile

 # use debian base
 FROM debian:buster-slim
 
+# apt proxy (optional)
+ARG APTPROXY=
+RUN test -n "$APTPROXY" && printf 'Acquire::http { Proxy "%s"; }\n' $APTPROXY | tee -a /etc/apt/apt.conf.d/proxy
+
 # update
 RUN set -e; \
 	apt-get update; \
 	apt-get -y upgrade; \
 	:
 
-RUN apt-get update ; apt-get -y install wget make tar p7zip-full squashfs-tools vim \
-	e2fsprogs parted dosfstools acpica-tools mtools \
-	device-tree-compiler xz-utils sudo gcc libssl-dev python2 python3 \
+RUN apt-get update ; apt-get -y install build-essential wget make p7zip p7zip-full \
+        device-tree-compiler acpica-tools xz-utils sudo gcc libssl-dev python2 \
         bison flex u-boot-tools git bc fuseext2 e2tools multistrap \
-	qemu-system-arm g++ cpio python unzip rsync
+        qemu-system-arm g++ cpio python unzip rsync dosfstools tar pandoc \
+        python3 meson ninja-build squashfs-tools parted mtools
 
 # build environment
 WORKDIR /work
+COPY shflags /
 COPY entry.sh /
 ENTRYPOINT ["/bin/sh", "/entry.sh"]

docker/entry.sh

@@ -8,27 +8,30 @@
 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 # 
 
-if [ $# -ne 2 ]; then
-	echo "Error: Missing arguments uid and gid!"
-	echo "Maybe you forgot to pass <uid> <gid> to docker run?"
-	exit 1
-fi
+# include shFlags library
+. /shflags
 
-_UID=$1
-_GID=$2
+# declare flags
+DEFINE_integer 'uid' 1000 'User ID to run as' 'u'
+DEFINE_integer 'gid' 100 'Group ID to run as' 'g'
 
-# create build user (and group if it does not exist)
-groupadd -g $_GID build 2>/dev/null || true
-useradd -s /bin/bash -m -u $_UID -g $_GID build
+# parse flags
+FLAGS "$@" || exit 1
+eval set -- "${FLAGS_ARGV}"
 
-# passwordless sudo for build user
-adduser build sudo
-echo '%sudo ALL=(ALL) NOPASSWD:ALL' >> /etc/sudoers
+# create build-user and group if not root
+user=root
+if [ "x${FLAGS_uid}" != "x0" ]; then
+	groupadd -g ${FLAGS_gid} build 2>/dev/null || true
+	useradd -s /bin/bash -u ${FLAGS_uid} -g ${FLAGS_gid} -m -G sudo build
+	echo '%sudo ALL=(ALL) NOPASSWD:ALL' >> /etc/sudoers
+	user=build
+fi
 
 # preconfigure git identity
-sudo -u build git config --global user.name "LX2160A Toolchain Container"
-sudo -u build git config --global user.email "support@solid-run.com"
+sudo -u $user git config --global user.name "LX2160A Toolchain Container"
+sudo -u $user git config --global user.email "support@solid-run.com"
 
 cd /work
 # now run the build script as the build user
-sudo -u build ./runme.sh
+sudo -u $user ./runme.sh

docker/shflags

+# vim:et:ft=sh:sts=2:sw=2
+#
+# Copyright 2008-2018 Kate Ward. All Rights Reserved.
+# Released under the Apache License 2.0 license.
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# shFlags is an advanced command-line flag library for Unix shell scripts.
+#
+# Author: kate.ward@forestent.com (Kate Ward)
+# https://github.com/kward/shflags
+#
+# This module implements something like the gflags library available
+# from https://github.com/gflags/gflags.
+#
+# FLAG TYPES: This is a list of the DEFINE_*'s that you can do.  All flags take
+# a name, default value, help-string, and optional 'short' name (one-letter
+# name). Some flags have other arguments, which are described with the flag.
+#
+# DEFINE_string: takes any input, and interprets it as a string.
+#
+# DEFINE_boolean: does not take any arguments. Say --myflag to set
+#   FLAGS_myflag to true, or --nomyflag to set FLAGS_myflag to false. For short
+#   flags, passing the flag on the command-line negates the default value, i.e.
+#   if the default is true, passing the flag sets the value to false.
+#
+# DEFINE_float: takes an input and interprets it as a floating point number. As
+#   shell does not support floats per-se, the input is merely validated as
+#   being a valid floating point value.
+#
+# DEFINE_integer: takes an input and interprets it as an integer.
+#
+# SPECIAL FLAGS: There are a few flags that have special meaning:
+#   --help (or -?)  prints a list of all the flags in a human-readable fashion
+#   --flagfile=foo  read flags from foo.  (not implemented yet)
+#   --              as in getopt(), terminates flag-processing
+#
+# EXAMPLE USAGE:
+#
+#   -- begin hello.sh --
+#   #! /bin/sh
+#   . ./shflags
+#   DEFINE_string name 'world' "somebody's name" n
+#   FLAGS "$@" || exit $?
+#   eval set -- "${FLAGS_ARGV}"
+#   echo "Hello, ${FLAGS_name}."
+#   -- end hello.sh --
+#
+#   $ ./hello.sh -n Kate
+#   Hello, Kate.
+#
+# CUSTOMIZABLE BEHAVIOR:
+#
+# A script can override the default 'getopt' command by providing the path to
+# an alternate implementation by defining the FLAGS_GETOPT_CMD variable.
+#
+# NOTES:
+#
+# * Not all systems include a getopt version that supports long flags. On these
+#   systems, only short flags are recognized.
+
+#==============================================================================
+# shFlags
+#
+# Shared attributes:
+#   flags_error:  last error message
+#   flags_output: last function output (rarely valid)
+#   flags_return: last return value
+#
+#   __flags_longNames: list of long names for all flags
+#   __flags_shortNames: list of short names for all flags
+#   __flags_boolNames: list of boolean flag names
+#
+#   __flags_opts: options parsed by getopt
+#
+# Per-flag attributes:
+#   FLAGS_<flag_name>: contains value of flag named 'flag_name'
+#   __flags_<flag_name>_default: the default flag value
+#   __flags_<flag_name>_help: the flag help string
+#   __flags_<flag_name>_short: the flag short name
+#   __flags_<flag_name>_type: the flag type
+#
+# Notes:
+# - lists of strings are space separated, and a null value is the '~' char.
+#
+### ShellCheck (http://www.shellcheck.net/)
+# expr may be antiquated, but it is the only solution in some cases.
+#   shellcheck disable=SC2003
+# $() are not fully portable (POSIX != portable).
+#   shellcheck disable=SC2006
+# [ p -a q ] are well defined enough (vs [ p ] && [ q ]).
+#   shellcheck disable=SC2166
+
+# Return if FLAGS already loaded.
+[ -n "${FLAGS_VERSION:-}" ] && return 0
+FLAGS_VERSION='1.2.3'
+
+# Return values that scripts can use.
+FLAGS_TRUE=0
+FLAGS_FALSE=1
+FLAGS_ERROR=2
+
+# Logging levels.
+FLAGS_LEVEL_DEBUG=0
+FLAGS_LEVEL_INFO=1
+FLAGS_LEVEL_WARN=2
+FLAGS_LEVEL_ERROR=3
+FLAGS_LEVEL_FATAL=4
+__FLAGS_LEVEL_DEFAULT=${FLAGS_LEVEL_WARN}
+
+# Determine some reasonable command defaults.
+__FLAGS_EXPR_CMD='expr --'
+__FLAGS_UNAME_S=`uname -s`
+if [ "${__FLAGS_UNAME_S}" = 'BSD' ]; then
+  __FLAGS_EXPR_CMD='gexpr --'
+else
+  _flags_output_=`${__FLAGS_EXPR_CMD} 2>&1`
+  if [ $? -eq ${FLAGS_TRUE} -a "${_flags_output_}" = '--' ]; then
+    # We are likely running inside BusyBox.
+    __FLAGS_EXPR_CMD='expr'
+  fi
+  unset _flags_output_
+fi
+
+# Commands a user can override if desired.
+FLAGS_EXPR_CMD=${FLAGS_EXPR_CMD:-${__FLAGS_EXPR_CMD}}
+FLAGS_GETOPT_CMD=${FLAGS_GETOPT_CMD:-getopt}
+
+#
+# Logging functions.
+#
+
+__flags_level=0 # Default logging level.
+
+_flags_debug() {
+  [ ${__flags_level} -le ${FLAGS_LEVEL_DEBUG} ] || return
+  echo "flags:DEBUG $*" >&2
+}
+_flags_info() {
+  [ ${__flags_level} -le ${FLAGS_LEVEL_INFO} ] || return
+  echo "flags:INFO $*" >&2
+}
+_flags_warn() {
+  [ ${__flags_level} -le ${FLAGS_LEVEL_WARN} ] || return
+  echo "flags:WARN $*" >&2
+}
+_flags_error() {
+  [ ${__flags_level} -le ${FLAGS_LEVEL_ERROR} ] || return
+  echo "flags:ERROR $*" >&2
+}
+_flags_fatal() {
+  [ ${__flags_level} -le ${FLAGS_LEVEL_FATAL} ] || return
+  echo "flags:FATAL $*" >&2
+  exit ${FLAGS_ERROR}
+}
+
+# Get the logging level.
+flags_loggingLevel() { echo ${__flags_level}; }
+
+# Set the logging level.
+#
+# Args:
+#   _flags_level_: integer: new logging level
+# Returns:
+#   nothing
+flags_setLoggingLevel() {
+  [ $# -ne 1 ] && _flags_fatal "flags_setLevel(): logging level missing"
+  _flags_level_=$1
+  [ "${_flags_level_}" -ge "${FLAGS_LEVEL_DEBUG}" \
+    -a "${_flags_level_}" -le "${FLAGS_LEVEL_FATAL}" ] \
+      || _flags_fatal "Invalid logging level '${_flags_level_}' specified."
+  __flags_level=$1
+  unset _flags_level_
+}
+
+#
+# Shell checks.
+#
+
+if [ -n "${ZSH_VERSION:-}" ]; then
+  setopt |grep "^shwordsplit$" >/dev/null
+  if [ $? -ne ${FLAGS_TRUE} ]; then
+    _flags_fatal 'zsh shwordsplit option is required for proper zsh operation'
+  fi
+  if [ -z "${FLAGS_PARENT:-}" ]; then
+    _flags_fatal "zsh does not pass \$0 through properly. please declare' \
+\"FLAGS_PARENT=\$0\" before calling shFlags"
+  fi
+fi
+
+# Can we use built-ins?
+( echo "${FLAGS_TRUE#0}"; ) >/dev/null 2>&1
+if [ $? -eq ${FLAGS_TRUE} ]; then
+  __FLAGS_USE_BUILTIN=${FLAGS_TRUE}
+else
+  __FLAGS_USE_BUILTIN=${FLAGS_FALSE}
+fi
+
+#
+# Constants.
+#
+
+# Reserved flag names.
+__FLAGS_RESERVED_LIST=' ARGC ARGV ERROR FALSE GETOPT_CMD HELP PARENT TRUE '
+__FLAGS_RESERVED_LIST="${__FLAGS_RESERVED_LIST} VERSION "
+
+# Determined getopt version (standard or enhanced).
+__FLAGS_GETOPT_VERS_STD=0
+__FLAGS_GETOPT_VERS_ENH=1
+
+# shellcheck disable=SC2120
+_flags_getopt_vers() {
+  _flags_getopt_cmd_=${1:-${FLAGS_GETOPT_CMD}}
+  case "`${_flags_getopt_cmd_} -lfoo '' --foo 2>&1`" in
+    ' -- --foo') echo ${__FLAGS_GETOPT_VERS_STD} ;;
+    ' --foo --') echo ${__FLAGS_GETOPT_VERS_ENH} ;;
+    # Unrecognized output. Assuming standard getopt version.
+    *) echo ${__FLAGS_GETOPT_VERS_STD} ;;
+  esac
+  unset _flags_getopt_cmd_
+}
+# shellcheck disable=SC2119
+__FLAGS_GETOPT_VERS=`_flags_getopt_vers`
+
+# getopt optstring lengths
+__FLAGS_OPTSTR_SHORT=0
+__FLAGS_OPTSTR_LONG=1
+
+__FLAGS_NULL='~'
+
+# Flag info strings.
+__FLAGS_INFO_DEFAULT='default'
+__FLAGS_INFO_HELP='help'
+__FLAGS_INFO_SHORT='short'
+__FLAGS_INFO_TYPE='type'
+
+# Flag lengths.
+__FLAGS_LEN_SHORT=0
+__FLAGS_LEN_LONG=1
+
+# Flag types.
+__FLAGS_TYPE_NONE=0
+__FLAGS_TYPE_BOOLEAN=1
+__FLAGS_TYPE_FLOAT=2
+__FLAGS_TYPE_INTEGER=3
+__FLAGS_TYPE_STRING=4
+
+# Set the constants readonly.
+__flags_constants=`set |awk -F= '/^FLAGS_/ || /^__FLAGS_/ {print $1}'`
+for __flags_const in ${__flags_constants}; do
+  # Skip certain flags.
+  case ${__flags_const} in
+    FLAGS_HELP) continue ;;
+    FLAGS_PARENT) continue ;;
+  esac
+  # Set flag readonly.
+  if [ -z "${ZSH_VERSION:-}" ]; then
+    readonly "${__flags_const}"
+    continue
+  fi
+  case ${ZSH_VERSION} in
+    [123].*) readonly "${__flags_const}" ;;
+    *) readonly -g "${__flags_const}" ;;  # Declare readonly constants globally.
+  esac
+done
+unset __flags_const __flags_constants
+
+#
+# Internal variables.
+#
+
+# Space separated lists.
+__flags_boolNames=' '     # Boolean flag names.
+__flags_longNames=' '     # Long flag names.
+__flags_shortNames=' '    # Short flag names.
+__flags_definedNames=' '  # Defined flag names (used for validation).
+
+__flags_columns=''  # Screen width in columns.
+__flags_opts=''     # Temporary storage for parsed getopt flags.
+
+# Define a flag.
+#
+# Calling this function will define the following info variables for the
+# specified flag:
+#   FLAGS_flagname - the name for this flag (based upon the long flag name)
+#   __flags_<flag_name>_default - the default value
+#   __flags_flagname_help - the help string
+#   __flags_flagname_short - the single letter alias
+#   __flags_flagname_type - the type of flag (one of __FLAGS_TYPE_*)
+#
+# Args:
+#   _flags_type_: integer: internal type of flag (__FLAGS_TYPE_*)
+#   _flags_name_: string: long flag name
+#   _flags_default_: default flag value
+#   _flags_help_: string: help string
+#   _flags_short_: string: (optional) short flag name
+# Returns:
+#   integer: success of operation, or error
+_flags_define() {
+  if [ $# -lt 4 ]; then
+    flags_error='DEFINE error: too few arguments'
+    flags_return=${FLAGS_ERROR}
+    _flags_error "${flags_error}"
+    return ${flags_return}
+  fi
+
+  _flags_type_=$1
+  _flags_name_=$2
+  _flags_default_=$3
+  _flags_help_=${4:-§}  # Special value '§' indicates no help string provided.
+  _flags_short_=${5:-${__FLAGS_NULL}}
+
+  _flags_debug "type:${_flags_type_} name:${_flags_name_}" \
+      "default:'${_flags_default_}' help:'${_flags_help_}'" \
+      "short:${_flags_short_}"
+
+  _flags_return_=${FLAGS_TRUE}
+  _flags_usName_="`_flags_underscoreName "${_flags_name_}"`"
+
+  # Check whether the flag name is reserved.
+  _flags_itemInList "${_flags_usName_}" "${__FLAGS_RESERVED_LIST}"
+  if [ $? -eq ${FLAGS_TRUE} ]; then
+    flags_error="flag name (${_flags_name_}) is reserved"
+    _flags_return_=${FLAGS_ERROR}
+  fi
+
+  # Require short option for getopt that don't support long options.
+  if [ ${_flags_return_} -eq ${FLAGS_TRUE} \
+      -a "${__FLAGS_GETOPT_VERS}" -ne "${__FLAGS_GETOPT_VERS_ENH}" \
+      -a "${_flags_short_}" = "${__FLAGS_NULL}" ]
+  then
+    flags_error="short flag required for (${_flags_name_}) on this platform"
+    _flags_return_=${FLAGS_ERROR}
+  fi
+
+  # Check for existing long name definition.
+  if [ ${_flags_return_} -eq ${FLAGS_TRUE} ]; then
+    if _flags_itemInList "${_flags_usName_}" "${__flags_definedNames}"; then
+      flags_error="definition for ([no]${_flags_name_}) already exists"
+      _flags_warn "${flags_error}"
+      _flags_return_=${FLAGS_FALSE}
+    fi
+  fi
+
+  # Check for existing short name definition.
+  if [ ${_flags_return_} -eq ${FLAGS_TRUE} \
+      -a "${_flags_short_}" != "${__FLAGS_NULL}" ]
+  then
+    if _flags_itemInList "${_flags_short_}" "${__flags_shortNames}"; then
+      flags_error="flag short name (${_flags_short_}) already defined"
+      _flags_warn "${flags_error}"
+      _flags_return_=${FLAGS_FALSE}
+    fi
+  fi
+
+  # Handle default value. Note, on several occasions the 'if' portion of an
+  # if/then/else contains just a ':' which does nothing. A binary reversal via
+  # '!' is not done because it does not work on all shells.
+  if [ ${_flags_return_} -eq ${FLAGS_TRUE} ]; then
+    case ${_flags_type_} in
+      ${__FLAGS_TYPE_BOOLEAN})
+        if _flags_validBool "${_flags_default_}"; then
+          case ${_flags_default_} in
+            true|t|0) _flags_default_=${FLAGS_TRUE} ;;
+            false|f|1) _flags_default_=${FLAGS_FALSE} ;;
+          esac
+        else
+          flags_error="invalid default flag value '${_flags_default_}'"
+          _flags_return_=${FLAGS_ERROR}
+        fi
+        ;;
+
+      ${__FLAGS_TYPE_FLOAT})
+        if _flags_validFloat "${_flags_default_}"; then
+          :
+        else
+          flags_error="invalid default flag value '${_flags_default_}'"
+          _flags_return_=${FLAGS_ERROR}
+        fi
+        ;;
+
+      ${__FLAGS_TYPE_INTEGER})
+        if _flags_validInt "${_flags_default_}"; then
+          :
+        else
+          flags_error="invalid default flag value '${_flags_default_}'"
+          _flags_return_=${FLAGS_ERROR}
+        fi
+        ;;
+
+      ${__FLAGS_TYPE_STRING}) ;;  # Everything in shell is a valid string.
+
+      *)
+        flags_error="unrecognized flag type '${_flags_type_}'"
+        _flags_return_=${FLAGS_ERROR}
+        ;;
+    esac
+  fi
+
+  if [ ${_flags_return_} -eq ${FLAGS_TRUE} ]; then
+    # Store flag information.
+    eval "FLAGS_${_flags_usName_}='${_flags_default_}'"
+    eval "__flags_${_flags_usName_}_${__FLAGS_INFO_TYPE}=${_flags_type_}"
+    eval "__flags_${_flags_usName_}_${__FLAGS_INFO_DEFAULT}=\
+\"${_flags_default_}\""
+    eval "__flags_${_flags_usName_}_${__FLAGS_INFO_HELP}=\"${_flags_help_}\""
+    eval "__flags_${_flags_usName_}_${__FLAGS_INFO_SHORT}='${_flags_short_}'"
+
+    # append flag names to name lists
+    __flags_shortNames="${__flags_shortNames}${_flags_short_} "
+    __flags_longNames="${__flags_longNames}${_flags_name_} "
+    [ "${_flags_type_}" -eq "${__FLAGS_TYPE_BOOLEAN}" ] && \
+        __flags_boolNames="${__flags_boolNames}no${_flags_name_} "
+
+    # Append flag names to defined names for later validation checks.
+    __flags_definedNames="${__flags_definedNames}${_flags_usName_} "
+    [ "${_flags_type_}" -eq "${__FLAGS_TYPE_BOOLEAN}" ] && \
+        __flags_definedNames="${__flags_definedNames}no${_flags_usName_} "
+  fi
+
+  flags_return=${_flags_return_}
+  unset _flags_default_ _flags_help_ _flags_name_ _flags_return_ \
+      _flags_short_ _flags_type_ _flags_usName_
+  [ ${flags_return} -eq ${FLAGS_ERROR} ] && _flags_error "${flags_error}"
+  return ${flags_return}
+}
+
+# Underscore a flag name by replacing dashes with underscores.
+#
+# Args:
+#   unnamed: string: log flag name
+# Output:
+#   string: underscored name
+_flags_underscoreName() {
+  echo "$1" |tr z- z_
+}
+
+# Return valid getopt options using currently defined list of long options.
+#
+# This function builds a proper getopt option string for short (and long)
+# options, using the current list of long options for reference.
+#
+# Args:
+#   _flags_optStr: integer: option string type (__FLAGS_OPTSTR_*)
+# Output:
+#   string: generated option string for getopt
+# Returns:
+#   boolean: success of operation (always returns True)
+_flags_genOptStr() {
+  _flags_optStrType_=$1
+
+  _flags_opts_=''
+
+  for _flags_name_ in ${__flags_longNames}; do
+    _flags_usName_="`_flags_underscoreName "${_flags_name_}"`"
+    _flags_type_="`_flags_getFlagInfo "${_flags_usName_}" "${__FLAGS_INFO_TYPE}"`"
+    [ $? -eq ${FLAGS_TRUE} ] || _flags_fatal 'call to _flags_type_ failed'
+    case ${_flags_optStrType_} in
+      ${__FLAGS_OPTSTR_SHORT})
+        _flags_shortName_="`_flags_getFlagInfo \
+            "${_flags_usName_}" "${__FLAGS_INFO_SHORT}"`"
+        if [ "${_flags_shortName_}" != "${__FLAGS_NULL}" ]; then
+          _flags_opts_="${_flags_opts_}${_flags_shortName_}"
+          # getopt needs a trailing ':' to indicate a required argument.
+          [ "${_flags_type_}" -ne "${__FLAGS_TYPE_BOOLEAN}" ] && \
+              _flags_opts_="${_flags_opts_}:"
+        fi
+        ;;
+
+      ${__FLAGS_OPTSTR_LONG})
+        _flags_opts_="${_flags_opts_:+${_flags_opts_},}${_flags_name_}"
+        # getopt needs a trailing ':' to indicate a required argument
+        [ "${_flags_type_}" -ne "${__FLAGS_TYPE_BOOLEAN}" ] && \
+            _flags_opts_="${_flags_opts_}:"
+        ;;
+    esac
+  done
+
+  echo "${_flags_opts_}"
+  unset _flags_name_ _flags_opts_ _flags_optStrType_ _flags_shortName_ \
+      _flags_type_ _flags_usName_
+  return ${FLAGS_TRUE}
+}
+
+# Returns flag details based on a flag name and flag info.
+#
+# Args:
+#   string: underscored flag name
+#   string: flag info (see the _flags_define function for valid info types)
+# Output:
+#   string: value of dereferenced flag variable
+# Returns:
+#   integer: one of FLAGS_{TRUE|FALSE|ERROR}
+_flags_getFlagInfo() {
+  # Note: adding gFI to variable names to prevent naming conflicts with calling
+  # functions
+  _flags_gFI_usName_=$1
+  _flags_gFI_info_=$2
+
+  # Example: given argument usName (underscored flag name) of 'my_flag', and
+  # argument info of 'help', set the _flags_infoValue_ variable to the value of
+  # ${__flags_my_flag_help}, and see if it is non-empty.
+  _flags_infoVar_="__flags_${_flags_gFI_usName_}_${_flags_gFI_info_}"
+  _flags_strToEval_="_flags_infoValue_=\"\${${_flags_infoVar_}:-}\""
+  eval "${_flags_strToEval_}"
+  if [ -n "${_flags_infoValue_}" ]; then
+    # Special value '§' indicates no help string provided.
+    [ "${_flags_gFI_info_}" = ${__FLAGS_INFO_HELP} \
+        -a "${_flags_infoValue_}" = '§' ] && _flags_infoValue_=''
+    flags_return=${FLAGS_TRUE}
+  else
+    # See if the _flags_gFI_usName_ variable is a string as strings can be
+    # empty...
+    # Note: the DRY principle would say to have this function call itself for
+    # the next three lines, but doing so results in an infinite loop as an
+    # invalid _flags_name_ will also not have the associated _type variable.
+    # Because it doesn't (it will evaluate to an empty string) the logic will
+    # try to find the _type variable of the _type variable, and so on. Not so
+    # good ;-)
+    #
+    # Example cont.: set the _flags_typeValue_ variable to the value of
+    # ${__flags_my_flag_type}, and see if it equals '4'.
+    _flags_typeVar_="__flags_${_flags_gFI_usName_}_${__FLAGS_INFO_TYPE}"
+    _flags_strToEval_="_flags_typeValue_=\"\${${_flags_typeVar_}:-}\""
+    eval "${_flags_strToEval_}"
+    # shellcheck disable=SC2154
+    if [ "${_flags_typeValue_}" = "${__FLAGS_TYPE_STRING}" ]; then
+      flags_return=${FLAGS_TRUE}
+    else
+      flags_return=${FLAGS_ERROR}
+      flags_error="missing flag info variable (${_flags_infoVar_})"
+    fi
+  fi
+
+  echo "${_flags_infoValue_}"
+  unset _flags_gFI_usName_ _flags_gfI_info_ _flags_infoValue_ _flags_infoVar_ \
+      _flags_strToEval_ _flags_typeValue_ _flags_typeVar_
+  [ ${flags_return} -eq ${FLAGS_ERROR} ] && _flags_error "${flags_error}"
+  return ${flags_return}
+}
+
+# Check for presence of item in a list.
+#
+# Passed a string (e.g. 'abc'), this function will determine if the string is
+# present in the list of strings (e.g.  ' foo bar abc ').
+#
+# Args:
+#   _flags_str_: string: string to search for in a list of strings
+#   unnamed: list: list of strings
+# Returns:
+#   boolean: true if item is in the list
+_flags_itemInList() {
+  _flags_str_=$1
+  shift
+
+  case " ${*:-} " in
+    *\ ${_flags_str_}\ *) flags_return=${FLAGS_TRUE} ;;
+    *) flags_return=${FLAGS_FALSE} ;;
+  esac
+
+  unset _flags_str_
+  return ${flags_return}
+}
+
+# Returns the width of the current screen.
+#
+# Output:
+#   integer: width in columns of the current screen.
+_flags_columns() {
+  if [ -z "${__flags_columns}" ]; then
+    if eval stty size >/dev/null 2>&1; then
+      # stty size worked :-)
+      # shellcheck disable=SC2046
+      set -- `stty size`
+      __flags_columns="${2:-}"
+    fi
+  fi
+  if [ -z "${__flags_columns}" ]; then
+   if eval tput cols >/dev/null 2>&1; then
+      # shellcheck disable=SC2046
+      set -- `tput cols`
+      __flags_columns="${1:-}"
+    fi
+  fi
+  echo "${__flags_columns:-80}"
+}
+
+# Validate a boolean.
+#
+# Args:
+#   _flags__bool: boolean: value to validate
+# Returns:
+#   bool: true if the value is a valid boolean
+_flags_validBool() {
+  _flags_bool_=$1
+
+  flags_return=${FLAGS_TRUE}
+  case "${_flags_bool_}" in
+    true|t|0) ;;
+    false|f|1) ;;
+    *) flags_return=${FLAGS_FALSE} ;;
+  esac
+
+  unset _flags_bool_
+  return ${flags_return}
+}
+
+# Validate a float.
+#
+# Args:
+#   _flags_float_: float: value to validate
+# Returns:
+#   bool: true if the value is a valid integer
+_flags_validFloat() {
+  flags_return=${FLAGS_FALSE}
+  [ -n "$1" ] || return ${flags_return}
+  _flags_float_=$1
+
+  if _flags_validInt "${_flags_float_}"; then
+    flags_return=${FLAGS_TRUE}
+  elif _flags_useBuiltin; then
+    _flags_float_whole_=${_flags_float_%.*}
+    _flags_float_fraction_=${_flags_float_#*.}
+    [ "${_flags_float_whole_}" = '-' ] && _flags_float_whole_='-0'
+    if _flags_validInt "${_flags_float_whole_:-0}" -a \
+      _flags_validInt "${_flags_float_fraction_}"; then
+      flags_return=${FLAGS_TRUE}
+    fi
+    unset _flags_float_whole_ _flags_float_fraction_
+  else
+    flags_return=${FLAGS_TRUE}
+    case ${_flags_float_} in
+      -*)  # Negative floats.
+        _flags_test_=`${FLAGS_EXPR_CMD} "${_flags_float_}" :\
+            '\(-[0-9]*\.[0-9]*\)'`
+        ;;
+      *)  # Positive floats.
+        _flags_test_=`${FLAGS_EXPR_CMD} "${_flags_float_}" :\
+            '\([0-9]*\.[0-9]*\)'`
+        ;;
+    esac
+    [ "${_flags_test_}" != "${_flags_float_}" ] && flags_return=${FLAGS_FALSE}
+    unset _flags_test_
+  fi
+
+  unset _flags_float_ _flags_float_whole_ _flags_float_fraction_
+  return ${flags_return}
+}
+
+# Validate an integer.
+#
+# Args:
+#   _flags_int_: integer: value to validate
+# Returns:
+#   bool: true if the value is a valid integer
+_flags_validInt() {
+  expr \( "$1" + '0' \) '=' "$1" >/dev/null 2>&1
+}
+
+# Parse command-line options using the standard getopt.
+#
+# Note: the flag options are passed around in the global __flags_opts so that
+# the formatting is not lost due to shell parsing and such.
+#
+# Args:
+#   @: varies: command-line options to parse
+# Returns:
+#   integer: a FLAGS success condition
+_flags_getoptStandard() {
+  flags_return=${FLAGS_TRUE}
+  _flags_shortOpts_=`_flags_genOptStr ${__FLAGS_OPTSTR_SHORT}`
+
+  # Check for spaces in passed options.
+  for _flags_opt_ in "$@"; do
+    # Note: the silliness with the x's is purely for ksh93 on Ubuntu 6.06.
+    _flags_match_=`echo "x${_flags_opt_}x" |sed 's/ //g'`
+    if [ "${_flags_match_}" != "x${_flags_opt_}x" ]; then
+      flags_error='the available getopt does not support spaces in options'
+      flags_return=${FLAGS_ERROR}
+      break
+    fi
+  done
+
+  if [ ${flags_return} -eq ${FLAGS_TRUE} ]; then
+    __flags_opts=`getopt "${_flags_shortOpts_}" "$@" 2>&1`
+    _flags_rtrn_=$?
+    if [ ${_flags_rtrn_} -ne ${FLAGS_TRUE} ]; then
+      _flags_warn "${__flags_opts}"
+      flags_error='unable to parse provided options with getopt.'
+      flags_return=${FLAGS_ERROR}
+    fi
+  fi
+
+  unset _flags_match_ _flags_opt_ _flags_rtrn_ _flags_shortOpts_
+  return ${flags_return}
+}
+
+# Parse command-line options using the enhanced getopt.
+#
+# Note: the flag options are passed around in the global __flags_opts so that
+# the formatting is not lost due to shell parsing and such.
+#
+# Args:
+#   @: varies: command-line options to parse
+# Returns:
+#   integer: a FLAGS success condition
+_flags_getoptEnhanced() {
+  flags_return=${FLAGS_TRUE}
+  _flags_shortOpts_=`_flags_genOptStr ${__FLAGS_OPTSTR_SHORT}`
+  _flags_boolOpts_=`echo "${__flags_boolNames}" \
+      |sed 's/^ *//;s/ *$//;s/ /,/g'`
+  _flags_longOpts_=`_flags_genOptStr ${__FLAGS_OPTSTR_LONG}`
+
+  __flags_opts=`${FLAGS_GETOPT_CMD} \
+      -o "${_flags_shortOpts_}" \
+      -l "${_flags_longOpts_},${_flags_boolOpts_}" \
+      -- "$@" 2>&1`
+  _flags_rtrn_=$?
+  if [ ${_flags_rtrn_} -ne ${FLAGS_TRUE} ]; then
+    _flags_warn "${__flags_opts}"
+    flags_error='unable to parse provided options with getopt.'
+    flags_return=${FLAGS_ERROR}
+  fi
+
+  unset _flags_boolOpts_ _flags_longOpts_ _flags_rtrn_ _flags_shortOpts_
+  return ${flags_return}
+}
+
+# Dynamically parse a getopt result and set appropriate variables.
+#
+# This function does the actual conversion of getopt output and runs it through
+# the standard case structure for parsing. The case structure is actually quite
+# dynamic to support any number of flags.
+#
+# Args:
+#   argc: int: original command-line argument count
+#   @: varies: output from getopt parsing
+# Returns:
+#   integer: a FLAGS success condition
+_flags_parseGetopt() {
+  _flags_argc_=$1
+  shift
+
+  flags_return=${FLAGS_TRUE}
+
+  if [ "${__FLAGS_GETOPT_VERS}" -ne "${__FLAGS_GETOPT_VERS_ENH}" ]; then
+    # The @$ must be unquoted as it needs to be re-split.
+    #   shellcheck disable=SC2068
+    set -- $@
+  else
+    # Note the quotes around the `$@' -- they are essential!
+    eval set -- "$@"
+  fi
+
+  # Provide user with the number of arguments to shift by later.
+  # NOTE: the FLAGS_ARGC variable is obsolete as of 1.0.3 because it does not
+  # properly give user access to non-flag arguments mixed in between flag
+  # arguments. Its usage was replaced by FLAGS_ARGV, and it is being kept only
+  # for backwards compatibility reasons.
+  FLAGS_ARGC=`_flags_math "$# - 1 - ${_flags_argc_}"`
+  export FLAGS_ARGC
+
+  # Handle options. note options with values must do an additional shift.
+  while true; do
+    _flags_opt_=$1
+    _flags_arg_=${2:-}
+    _flags_type_=${__FLAGS_TYPE_NONE}
+    _flags_name_=''
+
+    # Determine long flag name.
+    case "${_flags_opt_}" in
+      --) shift; break ;;  # Discontinue option parsing.
+
+      --*)  # Long option.
+        if _flags_useBuiltin; then
+          _flags_opt_=${_flags_opt_#*--}
+        else
+          _flags_opt_=`${FLAGS_EXPR_CMD} "${_flags_opt_}" : '--\(.*\)'`
+        fi
+        _flags_len_=${__FLAGS_LEN_LONG}
+        if _flags_itemInList "${_flags_opt_}" "${__flags_longNames}"; then
+          _flags_name_=${_flags_opt_}
+        else
+          # Check for negated long boolean version.
+          if _flags_itemInList "${_flags_opt_}" "${__flags_boolNames}"; then
+            if _flags_useBuiltin; then
+              _flags_name_=${_flags_opt_#*no}
+            else
+              _flags_name_=`${FLAGS_EXPR_CMD} "${_flags_opt_}" : 'no\(.*\)'`
+            fi
+            _flags_type_=${__FLAGS_TYPE_BOOLEAN}
+            _flags_arg_=${__FLAGS_NULL}
+          fi
+        fi
+        ;;
+
+      -*)  # Short option.
+        if _flags_useBuiltin; then
+          _flags_opt_=${_flags_opt_#*-}
+        else
+          _flags_opt_=`${FLAGS_EXPR_CMD} "${_flags_opt_}" : '-\(.*\)'`
+        fi
+        _flags_len_=${__FLAGS_LEN_SHORT}
+        if _flags_itemInList "${_flags_opt_}" "${__flags_shortNames}"; then
+          # Yes. Match short name to long name. Note purposeful off-by-one
+          # (too high) with awk calculations.
+          _flags_pos_=`echo "${__flags_shortNames}" \
+              |awk 'BEGIN{RS=" ";rn=0}$0==e{rn=NR}END{print rn}' \
+                  e="${_flags_opt_}"`
+          _flags_name_=`echo "${__flags_longNames}" \
+              |awk 'BEGIN{RS=" "}rn==NR{print $0}' rn="${_flags_pos_}"`
+        fi
+        ;;
+    esac
+
+    # Die if the flag was unrecognized.
+    if [ -z "${_flags_name_}" ]; then
+      flags_error="unrecognized option (${_flags_opt_})"
+      flags_return=${FLAGS_ERROR}
+      break
+    fi
+
+    # Set new flag value.
+    _flags_usName_=`_flags_underscoreName "${_flags_name_}"`
+    [ ${_flags_type_} -eq ${__FLAGS_TYPE_NONE} ] && \
+        _flags_type_=`_flags_getFlagInfo \
+            "${_flags_usName_}" ${__FLAGS_INFO_TYPE}`
+    case ${_flags_type_} in
+      ${__FLAGS_TYPE_BOOLEAN})
+        if [ ${_flags_len_} -eq ${__FLAGS_LEN_LONG} ]; then
+          if [ "${_flags_arg_}" != "${__FLAGS_NULL}" ]; then
+            eval "FLAGS_${_flags_usName_}=${FLAGS_TRUE}"
+          else
+            eval "FLAGS_${_flags_usName_}=${FLAGS_FALSE}"
+          fi
+        else
+          _flags_strToEval_="_flags_val_=\
+\${__flags_${_flags_usName_}_${__FLAGS_INFO_DEFAULT}}"
+          eval "${_flags_strToEval_}"
+          # shellcheck disable=SC2154
+          if [ "${_flags_val_}" -eq ${FLAGS_FALSE} ]; then
+            eval "FLAGS_${_flags_usName_}=${FLAGS_TRUE}"
+          else
+            eval "FLAGS_${_flags_usName_}=${FLAGS_FALSE}"
+          fi
+        fi
+        ;;
+
+      ${__FLAGS_TYPE_FLOAT})
+        if _flags_validFloat "${_flags_arg_}"; then
+          eval "FLAGS_${_flags_usName_}='${_flags_arg_}'"
+        else
+          flags_error="invalid float value (${_flags_arg_})"
+          flags_return=${FLAGS_ERROR}
+          break
+        fi
+        ;;
+
+      ${__FLAGS_TYPE_INTEGER})
+        if _flags_validInt "${_flags_arg_}"; then
+          eval "FLAGS_${_flags_usName_}='${_flags_arg_}'"
+        else
+          flags_error="invalid integer value (${_flags_arg_})"
+          flags_return=${FLAGS_ERROR}
+          break
+        fi
+        ;;
+
+      ${__FLAGS_TYPE_STRING})
+        eval "FLAGS_${_flags_usName_}='${_flags_arg_}'"
+        ;;
+    esac
+
+    # Handle special case help flag.
+    if [ "${_flags_usName_}" = 'help' ]; then
+      # shellcheck disable=SC2154
+      if [ "${FLAGS_help}" -eq ${FLAGS_TRUE} ]; then
+        flags_help
+        flags_error='help requested'
+        flags_return=${FLAGS_FALSE}
+        break
+      fi
+    fi
+
+    # Shift the option and non-boolean arguments out.
+    shift
+    [ "${_flags_type_}" != ${__FLAGS_TYPE_BOOLEAN} ] && shift
+  done
+
+  # Give user back non-flag arguments.
+  FLAGS_ARGV=''
+  while [ $# -gt 0 ]; do
+    FLAGS_ARGV="${FLAGS_ARGV:+${FLAGS_ARGV} }'$1'"
+    shift
+  done
+
+  unset _flags_arg_ _flags_len_ _flags_name_ _flags_opt_ _flags_pos_ \
+      _flags_strToEval_ _flags_type_ _flags_usName_ _flags_val_
+  return ${flags_return}
+}
+
+# Perform some path using built-ins.
+#
+# Args:
+#   $@: string: math expression to evaluate
+# Output:
+#   integer: the result
+# Returns:
+#   bool: success of math evaluation
+_flags_math() {
+  if [ $# -eq 0 ]; then
+    flags_return=${FLAGS_FALSE}
+  elif _flags_useBuiltin; then
+    # Variable assignment is needed as workaround for Solaris Bourne shell,
+    # which cannot parse a bare $((expression)).
+    # shellcheck disable=SC2016
+    _flags_expr_='$(($@))'
+    eval echo ${_flags_expr_}
+    flags_return=$?
+    unset _flags_expr_
+  else
+    eval expr "$@"
+    flags_return=$?
+  fi
+
+  return ${flags_return}
+}
+
+# Cross-platform strlen() implementation.
+#
+# Args:
+#   _flags_str: string: to determine length of
+# Output:
+#   integer: length of string
+# Returns:
+#   bool: success of strlen evaluation
+_flags_strlen() {
+  _flags_str_=${1:-}
+
+  if [ -z "${_flags_str_}" ]; then
+    flags_output=0
+  elif _flags_useBuiltin; then
+    flags_output=${#_flags_str_}
+  else
+    flags_output=`${FLAGS_EXPR_CMD} "${_flags_str_}" : '.*'`
+  fi
+  flags_return=$?
+
+  unset _flags_str_
+  echo "${flags_output}"
+  return ${flags_return}
+}
+
+# Use built-in helper function to enable unit testing.
+#
+# Args:
+#   None
+# Returns:
+#   bool: true if built-ins should be used
+_flags_useBuiltin() { return ${__FLAGS_USE_BUILTIN}; }
+
+#------------------------------------------------------------------------------
+# public functions
+#
+# A basic boolean flag. Boolean flags do not take any arguments, and their
+# value is either 1 (false) or 0 (true). For long flags, the false value is
+# specified on the command line by prepending the word 'no'. With short flags,
+# the presence of the flag toggles the current value between true and false.
+# Specifying a short boolean flag twice on the command results in returning the
+# value back to the default value.
+#
+# A default value is required for boolean flags.
+#
+# For example, lets say a Boolean flag was created whose long name was 'update'
+# and whose short name was 'x', and the default value was 'false'. This flag
+# could be explicitly set to 'true' with '--update' or by '-x', and it could be
+# explicitly set to 'false' with '--noupdate'.
+DEFINE_boolean() { _flags_define ${__FLAGS_TYPE_BOOLEAN} "$@"; }
+
+# Other basic flags.
+DEFINE_float()   { _flags_define ${__FLAGS_TYPE_FLOAT} "$@"; }
+DEFINE_integer() { _flags_define ${__FLAGS_TYPE_INTEGER} "$@"; }
+DEFINE_string()  { _flags_define ${__FLAGS_TYPE_STRING} "$@"; }
+
+# Parse the flags.
+#
+# Args:
+#   unnamed: list: command-line flags to parse
+# Returns:
+#   integer: success of operation, or error
+FLAGS() {
+  # Define a standard 'help' flag if one isn't already defined.
+  [ -z "${__flags_help_type:-}" ] && \
+      DEFINE_boolean 'help' false 'show this help' 'h'
+
+  # Parse options.
+  if [ $# -gt 0 ]; then
+    if [ "${__FLAGS_GETOPT_VERS}" -ne "${__FLAGS_GETOPT_VERS_ENH}" ]; then
+      _flags_getoptStandard "$@"
+    else
+      _flags_getoptEnhanced "$@"
+    fi
+    flags_return=$?
+  else
+    # Nothing passed; won't bother running getopt.
+    __flags_opts='--'
+    flags_return=${FLAGS_TRUE}
+  fi
+
+  if [ ${flags_return} -eq ${FLAGS_TRUE} ]; then
+    _flags_parseGetopt $# "${__flags_opts}"
+    flags_return=$?
+  fi
+
+  [ ${flags_return} -eq ${FLAGS_ERROR} ] && _flags_fatal "${flags_error}"
+  return ${flags_return}
+}
+
+# This is a helper function for determining the 'getopt' version for platforms
+# where the detection isn't working. It simply outputs debug information that
+# can be included in a bug report.
+#
+# Args:
+#   none
+# Output:
+#   debug info that can be included in a bug report
+# Returns:
+#   nothing
+flags_getoptInfo() {
+  # Platform info.
+  _flags_debug "uname -a: `uname -a`"
+  _flags_debug "PATH: ${PATH}"
+
+  # Shell info.
+  if [ -n "${BASH_VERSION:-}" ]; then
+    _flags_debug 'shell: bash'
+    _flags_debug "BASH_VERSION: ${BASH_VERSION}"
+  elif [ -n "${ZSH_VERSION:-}" ]; then
+    _flags_debug 'shell: zsh'
+    _flags_debug "ZSH_VERSION: ${ZSH_VERSION}"
+  fi
+
+  # getopt info.
+  ${FLAGS_GETOPT_CMD} >/dev/null
+  _flags_getoptReturn=$?
+  _flags_debug "getopt return: ${_flags_getoptReturn}"
+  _flags_debug "getopt --version: `${FLAGS_GETOPT_CMD} --version 2>&1`"
+
+  unset _flags_getoptReturn
+}
+
+# Returns whether the detected getopt version is the enhanced version.
+#
+# Args:
+#   none
+# Output:
+#   none
+# Returns:
+#   bool: true if getopt is the enhanced version
+flags_getoptIsEnh() {
+  test "${__FLAGS_GETOPT_VERS}" -eq "${__FLAGS_GETOPT_VERS_ENH}"
+}
+
+# Returns whether the detected getopt version is the standard version.
+#
+# Args:
+#   none
+# Returns:
+#   bool: true if getopt is the standard version
+flags_getoptIsStd() {
+  test "${__FLAGS_GETOPT_VERS}" -eq "${__FLAGS_GETOPT_VERS_STD}"
+}
+
+# This is effectively a 'usage()' function. It prints usage information and
+# exits the program with ${FLAGS_FALSE} if it is ever found in the command line
+# arguments. Note this function can be overridden so other apps can define
+# their own --help flag, replacing this one, if they want.
+#
+# Args:
+#   none
+# Returns:
+#   integer: success of operation (always returns true)
+flags_help() {
+  if [ -n "${FLAGS_HELP:-}" ]; then
+    echo "${FLAGS_HELP}" >&2
+  else
+    echo "USAGE: ${FLAGS_PARENT:-$0} [flags] args" >&2
+  fi
+  if [ -n "${__flags_longNames}" ]; then
+    echo 'flags:' >&2
+    for flags_name_ in ${__flags_longNames}; do
+      flags_flagStr_=''
+      flags_boolStr_=''
+      flags_usName_=`_flags_underscoreName "${flags_name_}"`
+
+      flags_default_=`_flags_getFlagInfo \
+          "${flags_usName_}" ${__FLAGS_INFO_DEFAULT}`
+      flags_help_=`_flags_getFlagInfo \
+          "${flags_usName_}" ${__FLAGS_INFO_HELP}`
+      flags_short_=`_flags_getFlagInfo \
+          "${flags_usName_}" ${__FLAGS_INFO_SHORT}`
+      flags_type_=`_flags_getFlagInfo \
+          "${flags_usName_}" ${__FLAGS_INFO_TYPE}`
+
+      [ "${flags_short_}" != "${__FLAGS_NULL}" ] && \
+          flags_flagStr_="-${flags_short_}"
+
+      if [ "${__FLAGS_GETOPT_VERS}" -eq "${__FLAGS_GETOPT_VERS_ENH}" ]; then
+        [ "${flags_short_}" != "${__FLAGS_NULL}" ] && \
+            flags_flagStr_="${flags_flagStr_},"
+        # Add [no] to long boolean flag names, except the 'help' flag.
+        [ "${flags_type_}" -eq ${__FLAGS_TYPE_BOOLEAN} \
+          -a "${flags_usName_}" != 'help' ] && \
+            flags_boolStr_='[no]'
+        flags_flagStr_="${flags_flagStr_}--${flags_boolStr_}${flags_name_}:"
+      fi
+
+      case ${flags_type_} in
+        ${__FLAGS_TYPE_BOOLEAN})
+          if [ "${flags_default_}" -eq ${FLAGS_TRUE} ]; then
+            flags_defaultStr_='true'
+          else
+            flags_defaultStr_='false'
+          fi
+          ;;
+        ${__FLAGS_TYPE_FLOAT}|${__FLAGS_TYPE_INTEGER})
+          flags_defaultStr_=${flags_default_} ;;
+        ${__FLAGS_TYPE_STRING}) flags_defaultStr_="'${flags_default_}'" ;;
+      esac
+      flags_defaultStr_="(default: ${flags_defaultStr_})"
+
+      flags_helpStr_="  ${flags_flagStr_}  ${flags_help_:+${flags_help_} }${flags_defaultStr_}"
+      _flags_strlen "${flags_helpStr_}" >/dev/null
+      flags_helpStrLen_=${flags_output}
+      flags_columns_=`_flags_columns`
+
+      if [ "${flags_helpStrLen_}" -lt "${flags_columns_}" ]; then
+        echo "${flags_helpStr_}" >&2
+      else
+        echo "  ${flags_flagStr_}  ${flags_help_}" >&2
+        # Note: the silliness with the x's is purely for ksh93 on Ubuntu 6.06
+        # because it doesn't like empty strings when used in this manner.
+        flags_emptyStr_="`echo \"x${flags_flagStr_}x\" \
+            |awk '{printf "%"length($0)-2"s", ""}'`"
+        flags_helpStr_="  ${flags_emptyStr_}  ${flags_defaultStr_}"
+        _flags_strlen "${flags_helpStr_}" >/dev/null
+        flags_helpStrLen_=${flags_output}
+
+        if [ "${__FLAGS_GETOPT_VERS}" -eq "${__FLAGS_GETOPT_VERS_STD}" \
+            -o "${flags_helpStrLen_}" -lt "${flags_columns_}" ]; then
+          # Indented to match help string.
+          echo "${flags_helpStr_}" >&2
+        else
+          # Indented four from left to allow for longer defaults as long flag
+          # names might be used too, making things too long.
+          echo "    ${flags_defaultStr_}" >&2
+        fi
+      fi
+    done
+  fi
+
+  unset flags_boolStr_ flags_default_ flags_defaultStr_ flags_emptyStr_ \
+      flags_flagStr_ flags_help_ flags_helpStr flags_helpStrLen flags_name_ \
+      flags_columns_ flags_short_ flags_type_ flags_usName_
+  return ${FLAGS_TRUE}
+}
+
+# Reset shflags back to an uninitialized state.
+#
+# Args:
+#   none
+# Returns:
+#   nothing
+flags_reset() {
+  for flags_name_ in ${__flags_longNames}; do
+    flags_usName_=`_flags_underscoreName "${flags_name_}"`
+    flags_strToEval_="unset FLAGS_${flags_usName_}"
+    for flags_type_ in \
+        ${__FLAGS_INFO_DEFAULT} \
+        ${__FLAGS_INFO_HELP} \
+        ${__FLAGS_INFO_SHORT} \
+        ${__FLAGS_INFO_TYPE}
+    do
+      flags_strToEval_=\
+"${flags_strToEval_} __flags_${flags_usName_}_${flags_type_}"
+    done
+    eval "${flags_strToEval_}"
+  done
+
+  # Reset internal variables.
+  __flags_boolNames=' '
+  __flags_longNames=' '
+  __flags_shortNames=' '
+  __flags_definedNames=' '
+
+  # Reset logging level back to default.
+  flags_setLoggingLevel ${__FLAGS_LEVEL_DEFAULT}
+
+  unset flags_name_ flags_type_ flags_strToEval_ flags_usName_
+}
+
+#
+# Initialization
+#
+
+# Set the default logging level.
+flags_setLoggingLevel ${__FLAGS_LEVEL_DEFAULT}

runme.sh

@@ -12,14 +12,14 @@ BUILDROOT_VERSION=2020.02.1
 ###############################################################################
 # Misc
 ###############################################################################
-RELEASE=${RELEASE:-LSDK-21.08}
-DDR_SPEED=${DDR_SPEED:-3200}
-SERDES=${SERDES:-8_5_2}
-UEFI_RELEASE=${UEFI_RELEASE:-RELEASE}
-SHALLOW=${SHALLOW:false}
-SECURE=${SECURE:false}
-ATF_DEBUG=${ATF_DEBUG:false}
-DISTRO=${DISTRO:ubuntu}
+: ${RELEASE:=LSDK-21.08}
+: ${DDR_SPEED:=2600}
+: ${SERDES:=8_5_2}
+: ${UEFI_RELEASE:=RELEASE}
+: ${SHALLOW:=false}
+: ${SECURE:=false}
+: ${ATF_DEBUG:=false}
+: ${DISTRO:=ubuntu}
 
 if [ "x$SHALLOW" == "xtrue" ]; then
 	SHALLOW_FLAG="--depth 1"