132 lines
3.5 KiB
Bash
Executable file
132 lines
3.5 KiB
Bash
Executable file
#!/usr/bin/env bash
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# Export Variables so they can be picked up by envsubst
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set -ae
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TEMPLATE_SRC=$1;
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DOCKER_DATA=$2;
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NETWORK_NAME="${NETWORK_NAME:-proxy}"
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get_date() {
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printf '%s' "$(date +'%Y.%m.%d_%H:%M:%S')"
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}
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# Import Template
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# Required Variables:
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# - TEMPLATE :: The template string which will be read by envsubst
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# Optional Variables:
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# - WRAP_START :: String to prepend in front of the mapped template result
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# - WRAP_END :: String to append to the mapped template result
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# - SEPARATOR :: String/Charater to separate TEMPLATE lines (DEFAULT: \n)
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# - OUT :: if set the result will be written to $OUT instead of stdout
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# Optional Functions:
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# - label_hook :: modify/override label query results
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# - template_hook :: hook to verify/modify template rsults (0 => OK; 1 => SKIP)
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# - finally_hook :: gets executed after (and also only if) the final result has been written to disk
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if [ -f "${TEMPLATE_SRC}" ]
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then
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source "${TEMPLATE_SRC}"
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if [ -z "${TEMPLATE}" ]
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then
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printf '%s | [ERR]: Template "%s" does define a template string.\n' "$(get_date)" "${TEMPLATE_SRC}"
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exit 1
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fi
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else
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printf '%s | [ERR]: No such File "%s".\n' "$(get_date)" "${TEMPLATE_SRC}";
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exit 1
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fi
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# Check Hooks
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if type label_hook 2>/dev/null | grep -q "label_hook is a function"
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then
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RUN_LABEL_HOOK=true
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else
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RUN_LABEL_HOOK=false
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fi
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if type template_hook 2>/dev/null | grep -q "template_hook is a function"
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then
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RUN_TEMPLATE_HOOK=true
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else
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RUN_TEMPLATE_HOOK=false
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fi
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if type finally_hook 2>/dev/null | grep -q "finally_hook is a function"
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then
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RUN_FINALLY_HOOK=true
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else
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RUN_FINALLY_HOOK=false
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fi
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if [ -z "${SEPARATOR+.}" ]
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then
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SEPARATOR='\n'
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fi
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for row in $(jq -r '.[] | @base64' <<< "${DOCKER_DATA}")
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do
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CONTAINER_DATA=$(base64 -d <<< "${row}");
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# Set non Label values
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if [ -z "${LOCAL_IP}" ]
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then
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LOCAL_IP=$(jq -r '.NetworkSettings.Networks | if has($ENV.NETWORK_NAME) then .[$ENV.NETWORK_NAME].IPAddress else first(.[].IPAddress) end' <<< "${CONTAINER_DATA}");
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fi
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# Read Label values
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CONTAINER_LABELS=$(jq '.Labels' <<< "${CONTAINER_DATA}");
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for var in $(envsubst -v "${TEMPLATE}")
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do
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if [ -z "${!var}" ]
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then
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VAR_LABEL=$(tr '[:upper:]_' '[:lower:].' <<< "${var}")
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LABEL_VAL=$(jq --arg KEY "${VAR_LABEL}" -r 'if has($KEY) then .[$KEY] else "" end' <<< "${CONTAINER_LABELS}")
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if [ -n "${LABEL_VAL}" ]
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then
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declare "${var}"="${LABEL_VAL}";
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fi
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fi
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done
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if ${RUN_LABEL_HOOK}
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then
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label_hook
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fi
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PARTIAL_RESULT="$(envsubst <<< "${TEMPLATE}")";
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# Verify template result if check_template is defined
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if ${RUN_TEMPLATE_HOOK}
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then
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if template_hook
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then
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# FIX with printf
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RESULT=$(printf '%s' "${RESULT}" "${RESULT:+$SEPARATOR}" "${PARTIAL_RESULT}")
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fi
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else
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RESULT=$(printf '%s' "${RESULT}" "${RESULT:+$SEPARATOR}" "${PARTIAL_RESULT}")
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fi
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# Unset label-environment variables for next container
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for var in $(envsubst -v "${TEMPLATE}")
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do
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unset "${var}"
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done
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done
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RESULT="$(printf "%s" "${WRAP_START}" "${RESULT}" "${WRAP_END}")"
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if [ -z "${OUT}" ]
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then
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printf "%b" "${RESULT}";
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else
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if [ "$(cat "${OUT}")" != "$(printf '%b'"${RESULT}")" ]
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then
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printf "%s | Template Task: '%s' has been written to: '%s'\n" "$(get_date)" "${TEMPLATE_SRC}" "${OUT}"
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printf "%b" "${RESULT}" > "${OUT}";
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if ${RUN_FINALLY_HOOK}
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then
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finally_hook
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fi
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fi
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fi
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