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DEVOPS-2704-init-container-modify-update-config-script-to-work-with-read-only-root-file-system
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‎lightrun-init-agent/update_config.sh

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#!/bin/sh
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# Script to initialize and configure the Lightrun agent
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# This script:
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# 1. Validates required environment variables
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# 2. Sets up a working directory
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# 3. Merges configuration files
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# 4. Updates configuration with environment variables
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# 5. Copies the final configuration to destination
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set -e
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if [[ ${LIGHTRUN_KEY} == "" ]]; then
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echo "Missing LIGHTRUN_KEY env variable"
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exit 1
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fi
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if [[ ${PINNED_CERT} == "" ]]; then
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echo "Missing PINNED_CERT env variable"
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exit 1
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fi
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if [[ ${LIGHTRUN_SERVER} == "" ]]; then
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echo "Missing LIGHTRUN_SERVER env variable"
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exit 1
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fi
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echo "Merging configs"
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awk -F'=' '{ if($1 in b) a[b[$1]]=$0;else{a[++i]=$0; b[$1]=i} }END{for(j=1;j<=i;j++) print a[j]}' /agent/agent.config /tmp/cm/agent.config > /tmp/tempconf
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cp /tmp/tempconf /agent/agent.config
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cp /tmp/cm/agent.metadata.json /agent/agent.metadata.json
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rm /tmp/tempconf
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echo "Set server and secrets"
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sed -i.bak "s|com.lightrun.server=.*|com.lightrun.server=https://$LIGHTRUN_SERVER|" /agent/agent.config && rm /agent/agent.config.bak
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sed -i.bak "s|com.lightrun.secret=.*|com.lightrun.secret=$LIGHTRUN_KEY|" /agent/agent.config && rm /agent/agent.config.bak
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sed -i.bak "s|pinned_certs=.*|pinned_certs=$PINNED_CERT|" /agent/agent.config && rm /agent/agent.config.bak
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cp -R /agent /tmp/agent
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echo "Finished"
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# Constants
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TMP_DIR="/tmp"
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WORK_DIR="${TMP_DIR}/agent-workdir"
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FINAL_DEST="${TMP_DIR}/agent"
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CONFIG_MAP_DIR="${TMP_DIR}/cm"
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# Function to validate required environment variables
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validate_env_vars() {
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local missing_vars=""
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if [ -z "${LIGHTRUN_KEY}" ]; then
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missing_vars="${missing_vars} LIGHTRUN_KEY"
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fi
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if [ -z "${PINNED_CERT}" ]; then
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missing_vars="${missing_vars} PINNED_CERT"
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fi
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if [ -z "${LIGHTRUN_SERVER}" ]; then
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missing_vars="${missing_vars} LIGHTRUN_SERVER"
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fi
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if [ -n "${missing_vars}" ]; then
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echo "Error: Missing required environment variables:${missing_vars}"
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exit 1
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fi
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}
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# Function to setup working directory
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setup_working_dir() {
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echo "Setting up working directory at ${WORK_DIR}"
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mkdir -p "${WORK_DIR}"
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cp -R /agent/* "${WORK_DIR}/"
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}
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# Function to merge configuration files
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merge_configs() {
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echo "Merging configuration files"
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local temp_conf="${WORK_DIR}/tempconf"
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# Merge base config and mounted configmap config
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awk -F'=' '{
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if($1 in b) a[b[$1]]=$0;
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else{a[++i]=$0; b[$1]=i}
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} END{for(j=1;j<=i;j++) print a[j]}' \
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"${WORK_DIR}/agent.config" \
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"${CONFIG_MAP_DIR}/agent.config" > "${temp_conf}"
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# Replace the config in the workdir with the merged one
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cp "${temp_conf}" "${WORK_DIR}/agent.config"
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# Copy metadata from configmap to workdir
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cp "${CONFIG_MAP_DIR}/agent.metadata.json" "${WORK_DIR}/agent.metadata.json"
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rm "${temp_conf}"
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}
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# Function to update configuration with environment variables
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update_config() {
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echo "Updating configuration with environment variables"
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local config_file="${WORK_DIR}/agent.config"
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local missing_configuration_params=""
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if sed -n "s|com.lightrun.server=.*|com.lightrun.server=https://${LIGHTRUN_SERVER}|p" "${config_file}" | grep -q .; then
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# Perform actual in-place change
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sed -i "s|com.lightrun.server=.*|com.lightrun.server=https://${LIGHTRUN_SERVER}|" "${config_file}"
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else
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missing_configuration_params="${missing_configuration_params} com.lightrun.server"
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fi
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if sed -n "s|com.lightrun.secret=.*|com.lightrun.secret=${LIGHTRUN_KEY}|p" "${config_file}" | grep -q .; then
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# Perform actual in-place change
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sed -i "s|com.lightrun.secret=.*|com.lightrun.secret=${LIGHTRUN_KEY}|" "${config_file}"
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else
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missing_configuration_params="${missing_configuration_params} com.lightrun.secret"
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fi
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if sed -n "s|pinned_certs=.*|pinned_certs=${PINNED_CERT}|p" "${config_file}" | grep -q .; then
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# Perform actual in-place change
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sed -i "s|pinned_certs=.*|pinned_certs=${PINNED_CERT}|" "${config_file}"
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else
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missing_configuration_params="${missing_configuration_params} pinned_certs"
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fi
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if [ -n "${missing_configuration_params}" ]; then
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echo "Error: Missing configuration parameters:${missing_configuration_params}"
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exit 1
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fi
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}
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# Function to copy final configuration
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copy_final_config() {
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echo "Copying configured agent to final destination ${FINAL_DEST}"
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cp -R "${WORK_DIR}" "${FINAL_DEST}"
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}
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# Function to cleanup
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cleanup() {
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echo "Cleaning up working directory"
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rm -rf "${WORK_DIR}"
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}
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# Main execution
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main() {
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validate_env_vars
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setup_working_dir
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merge_configs
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update_config
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copy_final_config
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cleanup
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echo "Configuration completed successfully"
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}
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# Execute main function
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main

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