feat: add option to include timestamp with init logs (#1332)

README.md

@@ -1559,6 +1559,20 @@ To enable the JVM flags required to fully support the [Flare profiling suite](ht
     
 Flare is built-in to Airplane/Pufferfish/Purpur, and is available in [plugin form](https://github.com/TECHNOVE/FlarePlugin) for other server types.
 
+### Enable timestamps in init logs
+
+Before the container starts the Minecraft Server its output is prefixed with `[init]`, such as
+
+```
+[init] Starting the Minecraft server...
+```
+
+To also include the timestamp with each log, set `LOG_TIMESTAMP` to "true". The log output will then look like:
+
+```
+[init] 2022-02-05 16:58:33+00:00 Starting the Minecraft server...
+```
+
 ## Autopause
 
 ### Description

scripts/start-utils

@@ -40,6 +40,10 @@ function getFilenameFromUrl() {
 }
 
 function isTrue() {
+  local oldState
+  oldState=$(shopt -po xtrace)
+  shopt -u -o xtrace
+
   local value=${1,,}
 
   result=
@@ -53,6 +57,7 @@ function isTrue() {
     ;;
   esac
 
+  eval "$oldState"
   return ${result}
 }
 
@@ -82,7 +87,18 @@ function logn() {
 }
 
 function log() {
-  echo "[init] $*"
+  local oldState
+  # The  return  status  when listing options is zero if all optnames are enabled, non- zero otherwise.
+  oldState=$(shopt -po xtrace || true)
+  shopt -u -o xtrace
+
+  if isDebugging || isTrue "${LOG_TIMESTAMP:-false}"; then
+    ts=" $(date --rfc-3339=seconds)"
+  else
+    ts=
+  fi
+  echo "[init]${ts} $*"
+  eval "$oldState"
 }
 
 function logAutopause() {