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overhauled gathering config vars to loop & include fallback mechanism
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@Cielquan
Cielquan committed Dec 10, 2019
1 parent f10c5d0 commit 30a3377
Showing 1 changed file with 83 additions and 191 deletions.
274 changes: 83 additions & 191 deletions start_doth_dns.bash
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Expand Up @@ -206,204 +206,96 @@ fi

# ##########################################################################################
### Check and set ENV Vars
# Set ARCHITECTURE
if [[ -n "${_FLAG_ARCHITECTURE}" ]]; then
if _ARCHITECTURE="${_FLAG_ARCHITECTURE}"; then
printf "%bINFO: %b ARCHITECTURE set by CLI argument to '%s'.\n" "${CYAN}" "${BLANK}" "${_ARCHITECTURE}"
else
printf "%bERROR: %b Failed to set ARCHITECTURE by CLI argument.\n" "${RED}" "${BLANK}"
exit_err
fi
elif [[ -n "${ARCHITECTURE}" ]]; then
if _ARCHITECTURE="${ARCHITECTURE}"; then
printf "%bINFO: %b ARCHITECTURE set by .env file to '%s'.\n" "${CYAN}" "${BLANK}" "${_ARCHITECTURE}"
else
printf "%bERROR: %b Failed to set ARCHITECTURE by .env file.\n" "${RED}" "${BLANK}"
exit_err
fi
elif [[ -n "${_ENV_ARCHITECTURE}" ]]; then
if _ARCHITECTURE="${_ENV_ARCHITECTURE}"; then
printf "%bINFO: %b ARCHITECTURE set by Environment Variable to '%s'.\n" "${CYAN}" "${BLANK}" "${_ARCHITECTURE}"
else
printf "%bERROR: %b Failed to set ARCHITECTURE by Environment Variable.\n" "${RED}" "${BLANK}"
exit_err
fi
if [[ -n "${_ARCHITECTURE}" ]]; then
if _ARCHITECTURE=$(lscpu | grep Architecture: | awk '{print $2}'); then
printf "%bINFO: %b ARCHITECTURE was determined and set to '%s'.\n" "${CYAN}" "${BLANK}" "${_ARCHITECTURE}"
else
printf "%bERROR: %b ARCHITECTURE was not set and could not be determined. `
`Please set ARCHITECTURE in '.env' file or via '-a' flag.\n" "${RED}" "${BLANK}"
exit_err
fi
fi
fi

# Set INTERFACE
if [[ -n "${_FLAG_INTERFACE}" ]]; then
if _INTERFACE="${_FLAG_INTERFACE}"; then
printf "%bINFO: %b INTERFACE set by CLI argument to '%s'.\n" "${CYAN}" "${BLANK}" "${_INTERFACE}"
else
printf "%bERROR: %b Failed to set INTERFACE by CLI argument.\n" "${RED}" "${BLANK}"
exit_err
fi
elif [[ -n "${INTERFACE}" ]]; then
if _INTERFACE="${INTERFACE}"; then
printf "%bINFO: %b INTERFACE set by .env file to '%s'.\n" "${CYAN}" "${BLANK}" "${_INTERFACE}"
else
printf "%bERROR: %b Failed to set INTERFACE by .env file.\n" "${RED}" "${BLANK}"
exit_err
fi
elif [[ -n "${_ENV_INTERFACE}" ]]; then
if _INTERFACE="${_ENV_INTERFACE}"; then
printf "%bINFO: %b INTERFACE set by Environment Variable to '%s'.\n" "${CYAN}" "${BLANK}" "${_INTERFACE}"
else
printf "%bERROR: %b Failed to set INTERFACE by Environment Variable.\n" "${RED}" "${BLANK}"
exit_err
fi
if [[ -n "${_INTERFACE}" ]]; then
if _INTERFACE=$(route | grep '^default' | grep -o '[^ ]*$'); then
printf "%bINFO: %b INTERFACE was determined and set to '%s'.\n" "${CYAN}" "${BLANK}" "${_INTERFACE}"
else
printf "%bERROR: %b INTERFACE was not set and could not be determined. `
`Please set INTERFACE in '.env' file or via '-a' flag.\n" "${RED}" "${BLANK}"
exit_err
fi
fi
fi

# Set HOST_IP for given INTERFACE
if [[ -n "${_FLAG_HOST_IP}" ]]; then
if _HOST_IP="${_FLAG_HOST_IP}"; then
printf "%bINFO: %b HOST_IP set by CLI argument to '%s'.\n" "${CYAN}" "${BLANK}" "${_HOST_IP}"
else
printf "%bERROR: %b Failed to set HOST_IP by CLI argument.\n" "${RED}" "${BLANK}"
exit_err
fi
elif [[ -n "${HOST_IP}" ]]; then
if _HOST_IP="${HOST_IP}"; then
printf "%bINFO: %b HOST_IP set by .env file to '%s'.\n" "${CYAN}" "${BLANK}" "${_HOST_IP}"
else
printf "%bERROR: %b Failed to set HOST_IP by .env file.\n" "${RED}" "${BLANK}"
exit_err
fi
elif [[ -n "${_ENV_HOST_IP}" ]]; then
if _HOST_IP="${_ENV_HOST_IP}"; then
printf "%bINFO: %b HOST_IP set by Environment Variable to '%s'.\n" "${CYAN}" "${BLANK}" "${_HOST_IP}"
else
printf "%bERROR: %b Failed to set HOST_IP by Environment Variable.\n" "${RED}" "${BLANK}"
exit_err
fi
if [[ -n "${_HOST_IP}" ]]; then
if _HOST_IP=$(ifconfig "${_INTERFACE}" | sed -En 's/127.0.0.1//;s/.*inet (addr:)?(([0-9]*\.){3}[0-9]*).*/\2/p'); then
printf "%bINFO: %b HOST_IP was determined and set to '%s'.\n" "${CYAN}" "${BLANK}" "${_HOST_IP}"
else
printf "%bERROR: %b HOST_IP was not set and could not be determined. `
`Please set HOST_IP in '.env' file or via '-a' flag.\n" "${RED}" "${BLANK}"
exit_err
fi
fi
fi


# Set HOSTNAME
if [[ -n "${_FLAG_HOST_NAME}" ]]; then
if _HOST_NAME="${_FLAG_HOST_NAME}"; then
printf "%bINFO: %b HOST_NAME set by CLI argument to '%s'.\n" "${CYAN}" "${BLANK}" "${_HOST_NAME}"
else
printf "%bERROR: %b Failed to set HOST_NAME by CLI argument.\n" "${RED}" "${BLANK}"
exit_err
fi
elif [[ -n "${HOST_NAME}" ]]; then
if _HOST_NAME="${HOST_NAME}"; then
printf "%bINFO: %b HOST_NAME set by .env file to '%s'.\n" "${CYAN}" "${BLANK}" "${_HOST_NAME}"
else
printf "%bERROR: %b Failed to set HOST_NAME by .env file.\n" "${RED}" "${BLANK}"
exit_err
fi
elif [[ -n "${_ENV_HOST_NAME}" ]]; then
if _HOST_NAME="${_ENV_HOST_NAME}"; then
printf "%bINFO: %b HOST_NAME set by Environment Variable to '%s'.\n" "${CYAN}" "${BLANK}" "${_HOST_NAME}"
else
printf "%bERROR: %b Failed to set HOST_NAME by Environment Variable.\n" "${RED}" "${BLANK}"
exit_err
fi
if [[ -n "${_HOST_NAME}" ]]; then
if _HOST_NAME=$(hostname); then
printf "%bINFO: %b HOST_NAME was determined and set to '%s'.\n" "${CYAN}" "${BLANK}" "${_HOST_NAME}"
else
printf "%bERROR: %b HOST_NAME was not set and could not be determined. `
`Please set HOST_NAME in '.env' file or via '-a' flag.\n" "${RED}" "${BLANK}"
exit_err
# Put config vars and sources into arrays
_CONF_VARS=(ARCHITECTURE INTERFACE HOST_IP HOST_NAME TIMEZONE DOMAIN)
_CONF_SOURCES=(FLAG ENV DOT_ENV)

# Loop trough config vars
for _CONF_VAR in "${_CONF_VARS[@]}"; do

# Set loop variable
_CONF_VAR_UC="_$_CONF_VAR"
_FALLBACK_START=""

# Loop trough sources
for _CONF_SOURCE in "${_CONF_SOURCES[@]}"; do

# Set variables according to source
case ${_CONF_SOURCE} in
FLAG)
_CONF_SOURCE_VAR="_FLAG_$_CONF_VAR"
_CONF_SOURCE_MESSAGE="'CLI argument'"
;;
ENV)
_CONF_SOURCE_VAR="_ENV_$_CONF_VAR"
_CONF_SOURCE_MESSAGE="'Environment Variable'"
;;
DOT_ENV)
_CONF_SOURCE_VAR="$_CONF_VAR"
_CONF_SOURCE_MESSAGE="'.env file'"
;;
esac

# Gather config from source
if [[ -z "${!_CONF_VAR_UC}" ]]; then
if [[ -n "${!_CONF_SOURCE_VAR}" ]]; then
if eval "${_CONF_VAR_UC}"='${!_CONF_SOURCE_VAR}'; then
printf "%b %s set to '%s' by %s.\n" "${INFO}" "${_CONF_VAR}" "${!_CONF_VAR_UC}" \
"${_CONF_SOURCE_MESSAGE}"
else
if [[ "${_FLAG_FALLBACK}" == 'y' ]]; then
_FALLBACK_START="y"
printf "%b Failed to set %s by %s. Falling back to next source.\n" "${WARNING}" \
"${_CONF_VAR}" "${_CONF_SOURCE_MESSAGE}"
else
printf "%b Failed to set %s by %s. Fallback to other sources is deactivated.\n" "${ERROR}" \
"${_CONF_VAR}" "${_CONF_SOURCE_MESSAGE}"
exit_err
fi
fi
elif [[ "${_FALLBACK_START}" == 'y' ]]; then
printf "%b Failed to set %s by %s because not set. Falling back to next source.\n" \
"${WARNING}" "${_CONF_VAR}" "${_CONF_SOURCE_MESSAGE}"
fi
fi
fi
fi

# Set TIMEZONE
if [[ -n "${_FLAG_TIMEZONE}" ]]; then
if _TIMEZONE="${_FLAG_TIMEZONE}"; then
printf "%bINFO: %b TIMEZONE set by CLI argument to '%s'.\n" "${CYAN}" "${BLANK}" "${_TIMEZONE}"
else
printf "%bERROR: %b Failed to set TIMEZONE by CLI argument.\n" "${RED}" "${BLANK}"
exit_err
fi
elif [[ -n "${TIMEZONE}" ]]; then
if _TIMEZONE="${TIMEZONE}"; then
printf "%bINFO: %b TIMEZONE set by .env file to '%s'.\n" "${CYAN}" "${BLANK}" "${_TIMEZONE}"
else
printf "%bERROR: %b Failed to set TIMEZONE by .env file.\n" "${RED}" "${BLANK}"
exit_err
fi
elif [[ -n "${_ENV_TIMEZONE}" ]]; then
if _TIMEZONE="${_ENV_TIMEZONE}"; then
printf "%bINFO: %b TIMEZONE set by Environment Variable to '%s'.\n" "${CYAN}" "${BLANK}" "${_TIMEZONE}"
else
printf "%bERROR: %b Failed to set TIMEZONE by Environment Variable.\n" "${RED}" "${BLANK}"
exit_err
fi
if [[ -n "${_TIMEZONE}" ]]; then
if _TIMEZONE=$(timedatectl | grep 'Time zone' | awk '{print $3}'); then
printf "%bINFO: %b TIMEZONE was determined and set to '%s'.\n" "${CYAN}" "${BLANK}" "${_TIMEZONE}"
done

# Self gather config via command
if [[ -z "${!_CONF_VAR_UC}" ]]; then
case "${_CONF_VAR}" in
ARCHITECTURE)
_ARCHITECTURE=$(lscpu | grep Architecture: | awk '{print $2}')
;;
INTERFACE)
_INTERFACE=$(route | grep '^default' | grep -o '[^ ]*$')
;;
HOST_IP)
_HOST_IP=$(ifconfig "${_INTERFACE}" | sed -En 's/127.0.0.1//;s/.*inet (addr:)?(([0-9]*\.){3}[0-9]*).*/\2/p')
;;
HOST_NAME)
_HOST_NAME=$(hostname)
;;
TIMEZONE)
_TIMEZONE=$(timedatectl | grep 'Time zone' | awk '{print $3}')
;;
DOMAIN)
_DOMAIN="${_HOST_NAME}".dns
;;
esac

if [[ -n "${!_CONF_VAR_UC}" ]]; then
printf "%b %s set to '%s' by determining from system.\n" "${INFO}" "${_CONF_VAR}" \
"${!_CONF_VAR_UC}"
else
printf "%bERROR: %b TIMEZONE was not set and could not be determined. `
`Please set TIMEZONE in '.env' file or via '-a' flag.\n" "${RED}" "${BLANK}"
printf "%b %s was not set and could not be determined. `
`Please set %s via '-a' flag, in the shell environment or in '.env' file.\n" "${ERROR}" \
"${_CONF_VAR}" "${_CONF_VAR}"
exit_err
fi
fi
fi

# Set DOMAIN or create with HOSTNAME
if [[ -n "${_FLAG_DOMAIN}" ]]; then
if _DOMAIN="${_FLAG_DOMAIN}"; then
printf "%bINFO: %b DOMAIN set by CLI argument to '%s'.\n" "${CYAN}" "${BLANK}" "${_DOMAIN}"
else
printf "%bERROR: %b Failed to set DOMAIN by CLI argument.\n" "${RED}" "${BLANK}"
exit_err
fi
elif [[ -n "${DOMAIN}" ]]; then
if _DOMAIN="${DOMAIN}"; then
printf "%bINFO: %b DOMAIN set by .env file to '%s'.\n" "${CYAN}" "${BLANK}" "${_DOMAIN}"
else
printf "%bERROR: %b Failed to set DOMAIN by .env file.\n" "${RED}" "${BLANK}"
exit_err
fi
elif [[ -n "${_ENV_DOMAIN}" ]]; then
if _DOMAIN="${_ENV_DOMAIN}"; then
printf "%bINFO: %b DOMAIN set by Environment Variable to '%s'.\n" "${CYAN}" "${BLANK}" "${_DOMAIN}"
else
printf "%bERROR: %b Failed to set DOMAIN by Environment Variable.\n" "${RED}" "${BLANK}"
exit_err
fi
if [[ -n "${_DOMAIN}" ]]; then
if _DOMAIN="${_HOST_NAME}.dns"; then
printf "%bINFO: %b DOMAIN was determined and set to '%s'.\n" "${CYAN}" "${BLANK}" "${_DOMAIN}"
else
printf "%bERROR: %b DOMAIN was not set and could not be created. `
`Please set DOMAIN in '.env' file or via '-a' flag.\n" "${RED}" "${BLANK}"
exit_err
fi
fi
fi
done


# ##########################################################################################
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