Add timestamp to log messages for easier tracking of time

src/scripts/start_nginx_certbot.sh

@@ -40,8 +40,8 @@ else
     nginx -g "daemon off;" &
     NGINX_PID=$!
 fi
+debug "PID of the main Nginx process: ${NGINX_PID}"
 
-info "Starting the autorenewal service"
 # Make sure a renewal interval is set before continuing.
 if [ -z "${RENEWAL_INTERVAL}" ]; then
     debug "RENEWAL_INTERVAL unset, using default of '8d'"
@@ -53,6 +53,8 @@ fi
 (
 set -e
 while true; do
+    info "Running the autorenewal service"
+
     # Create symlinks from conf.d/ to user_conf.d/ if necessary.
     symlink_user_configs
 
@@ -76,6 +78,7 @@ while true; do
 done
 ) &
 CERTBOT_LOOP_PID=$!
+debug "PID of the autorenewal loop: ${CERTBOT_LOOP_PID}"
 
 # A helper function to prematurely terminate the sleep process, inside the
 # autorenewal loop process, in order to immediately restart the loop again
@@ -104,4 +107,6 @@ while [ -z "${exit_code}" ] || [ "${exit_code}" = "129" ]; do
     wait -n ${NGINX_PID} ${CERTBOT_LOOP_PID}
     exit_code=$?
 done
+
+debug "Exiting with code ${exit_code}"
 exit "${exit_code}"

src/scripts/util.sh

@@ -1,20 +1,30 @@
 #!/bin/bash
 
+: ${DATE_FORMAT_STRING:="+%Y/%m/%d %T"}
+
+# Helper function used to output messages in a uniform manner.
+#
+# $1: The log level to print.
+# $2: The message to be printed.
+log() {
+    echo "$(date "${DATE_FORMAT_STRING}") [${1}] ${2}"
+}
+
 # Helper function to output debug messages to STDOUT if the `DEBUG` environment
 # variable is set to 1.
 #
 # $1: String to be printed.
 debug() {
     if [ 1 = "${DEBUG}" ]; then
-        echo "${1}"
+        log "debug" "${1}"
     fi
 }
 
 # Helper function to output informational messages to STDOUT.
 #
 # $1: String to be printed.
 info() {
-    echo "${1}"
+    log "info" "${1}"
 }
 
 # Helper function to output warning messages to STDOUT, with bold yellow text.
@@ -23,7 +33,7 @@ info() {
 warning() {
     (set +x; tput -Tscreen bold
     tput -Tscreen setaf 3
-    echo "${1}"
+    log "warning" "${1}"
     tput -Tscreen sgr0)
 }
 
@@ -33,7 +43,7 @@ warning() {
 error() {
     (set +x; tput -Tscreen bold
     tput -Tscreen setaf 1
-    echo "${1}"
+    log "error" "${1}"
     tput -Tscreen sgr0) >&2
 }