Add LOG_TO_STDOUT variable + documentation (#1379)

transmission/environment-variables.tmpl

@@ -97,5 +97,6 @@ export DROP_DEFAULT_ROUTE={{ .Env.DROP_DEFAULT_ROUTE }}
 # Support using transmission ids for transmission paths
 export GLOBAL_APPLY_PERMISSIONS={{ .Env.GLOBAL_APPLY_PERMISSIONS }}
 
-#Support logging to docker logs
-export DOCKER_LOG={{ .Env.DOCKER_LOG }}
+# Support logging to stdout which docker logs uses, mark either true
+export DOCKER_LOG={{ .Env.DOCKER_LOG }} # DEPRECIATED -- variable name does not reflect usage
+export LOG_TO_STDOUT={{ .Env.LOG_TO_STDOUT }} # Updated variable name

transmission/start.sh

@@ -60,7 +60,7 @@ if [[ "true" = "$DROP_DEFAULT_ROUTE" ]]; then
   ip r del default || exit 1
 fi
 
-if [[ "true" = "$DOCKER_LOG" ]]; then
+if [[ "true" = "$DOCKER_LOG" || "true" = "$LOG_TO_STDOUT" ]]; then
   LOGFILE=/dev/stdout
 else
   LOGFILE=${TRANSMISSION_HOME}/transmission.log

transmission/userSetup.sh

@@ -13,7 +13,7 @@ if [ -n "$PUID" ] && [ ! "$(id -u root)" -eq "$PUID" ]; then
         groupmod -o -g "$PGID" ${RUN_AS};
     fi
 
-    if [[ "true" = "$DOCKER_LOG" ]]; then
+    if [[ "true" = "$DOCKER_LOG" || "true" = "$LOG_TO_STDOUT" ]]; then
       chown ${RUN_AS}:${RUN_AS} /dev/stdout
     fi