SOLR-15960 Unified use of system properties and environment variables

solr/bin/solr

@@ -112,6 +112,13 @@ elif [ -r "$SOLR_INCLUDE" ]; then
   . "$SOLR_INCLUDE"
 fi
 
+# Export variables we want to make visible to Solr sub-process
+for var in $(compgen -e); do
+  if [[ "$var" =~ ^(SOLR_.*|DEFAULT_CONFDIR|ZK_.*|GCS_BUCKET|GCS_.*|S3_.*|OTEL_.*|AWS_.*)$ ]]; then
+    export "${var?}"
+  fi
+done
+
 # if pid dir is unset, default to $solr_tip/bin
 : "${SOLR_PID_DIR:=$SOLR_TIP/bin}"
 
@@ -1345,12 +1352,10 @@ if [ $# -gt 0 ]; then
         ;;
         -v)
             SOLR_LOG_LEVEL=DEBUG
-            PASS_TO_RUN_EXAMPLE+=("-Dsolr.log.level=$SOLR_LOG_LEVEL")
             shift
         ;;
         -q)
             SOLR_LOG_LEVEL=WARN
-            PASS_TO_RUN_EXAMPLE+=("-Dsolr.log.level=$SOLR_LOG_LEVEL")
             shift
         ;;
         -all)
@@ -1384,15 +1389,6 @@ if [ $# -gt 0 ]; then
   done
 fi
 
-if [[ -n ${SOLR_LOG_LEVEL:-} ]] ; then
-  SOLR_LOG_LEVEL_OPT="-Dsolr.log.level=$SOLR_LOG_LEVEL"
-fi
-
-# Solr modules option
-if [[ -n "${SOLR_MODULES:-}" ]] ; then
-  SCRIPT_SOLR_OPTS+=("-Dsolr.modules=$SOLR_MODULES")
-fi
-
 # Default placement plugin
 if [[ -n "${SOLR_PLACEMENTPLUGIN_DEFAULT:-}" ]] ; then
   SCRIPT_SOLR_OPTS+=("-Dsolr.placementplugin.default=$SOLR_PLACEMENTPLUGIN_DEFAULT")
@@ -1883,7 +1879,7 @@ function start_solr() {
   fi
 
   SOLR_START_OPTS=('-server' "${JAVA_MEM_OPTS[@]}" "${GC_TUNE_ARR[@]}" "${GC_LOG_OPTS[@]}" "${IP_ACL_OPTS[@]}" \
-    "${REMOTE_JMX_OPTS[@]}" "${CLOUD_MODE_OPTS[@]}" ${SOLR_LOG_LEVEL_OPT:-} -Dsolr.log.dir="$SOLR_LOGS_DIR" \
+    "${REMOTE_JMX_OPTS[@]}" "${CLOUD_MODE_OPTS[@]}" -Dsolr.log.dir="$SOLR_LOGS_DIR" \
     "-Djetty.port=$SOLR_PORT" "-DSTOP.PORT=$stop_port" "-DSTOP.KEY=$STOP_KEY" \
     # '-OmitStackTraceInFastThrow' ensures stack traces in errors,
     # users who don't care about useful error msgs can override in SOLR_OPTS with +OmitStackTraceInFastThrow

solr/bin/solr.cmd

@@ -559,13 +559,11 @@ goto parse_args
 
 :set_debug
 set SOLR_LOG_LEVEL=DEBUG
-set "PASS_TO_RUN_EXAMPLE=!PASS_TO_RUN_EXAMPLE! -Dsolr.log.level=%SOLR_LOG_LEVEL%"
 SHIFT
 goto parse_args
 
 :set_warn
 set SOLR_LOG_LEVEL=WARN
-set "PASS_TO_RUN_EXAMPLE=!PASS_TO_RUN_EXAMPLE! -Dsolr.log.level=%SOLR_LOG_LEVEL%"
 SHIFT
 goto parse_args
 
@@ -807,11 +805,6 @@ IF NOT "%SOLR_HOST%"=="" (
 
 set SCRIPT_SOLR_OPTS=
 
-REM Solr modules option
-IF DEFINED SOLR_MODULES (
-  set "SCRIPT_SOLR_OPTS=%SCRIPT_SOLR_OPTS% -Dsolr.modules=%SOLR_MODULES%"
-)
-
 REM Default placement plugin
 IF DEFINED SOLR_PLACEMENTPLUGIN_DEFAULT (
   set "SCRIPT_SOLR_OPTS=%SCRIPT_SOLR_OPTS% -Dsolr.placementplugin.default=%SOLR_PLACEMENTPLUGIN_DEFAULT%"
@@ -1220,7 +1213,6 @@ IF "%SOLR_SSL_ENABLED%"=="true" (
   set "SSL_PORT_PROP=-Dsolr.jetty.https.port=%SOLR_PORT%"
   set "START_OPTS=%START_OPTS% %SOLR_SSL_OPTS% !SSL_PORT_PROP!"
 )
-IF NOT "%SOLR_LOG_LEVEL%"=="" set "START_OPTS=%START_OPTS% -Dsolr.log.level=%SOLR_LOG_LEVEL%"
 
 set SOLR_LOGS_DIR_QUOTED="%SOLR_LOGS_DIR%"
 set SOLR_DATA_HOME_QUOTED="%SOLR_DATA_HOME%"

solr/bin/solr.in.cmd

@@ -100,7 +100,10 @@ REM start command line as-is, in ADDITION to other options. If you specify the
 REM -a option on start script, those options will be appended as well. Examples:
 REM set SOLR_OPTS=%SOLR_OPTS% -Dsolr.autoSoftCommit.maxTime=3000
 REM set SOLR_OPTS=%SOLR_OPTS% -Dsolr.autoCommit.maxTime=60000
-REM set SOLR_OPTS=%SOLR_OPTS% -Dsolr.clustering.enabled=true
+
+REM Most properties have an environment variable equivalent.
+REM A naming convention is that SOLR_FOO_BAR maps to solr.foo.bar
+REM SOLR_CLUSTERING_ENABLED=true
 
 REM Path to a directory for Solr to store cores and their data. By default, Solr will use server\solr
 REM If solr.xml is not stored in ZooKeeper, this directory needs to contain solr.xml

solr/bin/solr.in.sh

@@ -105,7 +105,10 @@
 # -a option on start script, those options will be appended as well. Examples:
 #SOLR_OPTS="$SOLR_OPTS -Dsolr.autoSoftCommit.maxTime=3000"
 #SOLR_OPTS="$SOLR_OPTS -Dsolr.autoCommit.maxTime=60000"
-#SOLR_OPTS="$SOLR_OPTS -Dsolr.clustering.enabled=true"
+
+# Most properties have an environment variable equivalent.
+# A naming convention is that SOLR_FOO_BAR maps to solr.foo.bar
+#SOLR_CLUSTERING_ENABLED=true
 
 # Location where the bin/solr script will save PID files for running instances
 # If not set, the script will create PID files in $SOLR_TIP/bin

solr/core/src/java/org/apache/solr/cli/SolrCLI.java

@@ -63,6 +63,7 @@
 import org.apache.solr.common.params.CommonParams;
 import org.apache.solr.common.util.ContentStreamBase;
 import org.apache.solr.common.util.NamedList;
+import org.apache.solr.util.EnvUtils;
 import org.apache.solr.util.StartupLoggingUtils;
 import org.apache.solr.util.configuration.SSLConfigurationsFactory;
 import org.slf4j.Logger;
@@ -187,18 +188,9 @@ public static CommandLine parseCmdLine(String toolName, String[] args, List<Opti
   }
 
   public static String getDefaultSolrUrl() {
-    String scheme = System.getenv("SOLR_URL_SCHEME");
-    if (scheme == null) {
-      scheme = "http";
-    }
-    String host = System.getenv("SOLR_TOOL_HOST");
-    if (host == null) {
-      host = "localhost";
-    }
-    String port = System.getenv("SOLR_PORT");
-    if (port == null) {
-      port = "8983";
-    }
+    String scheme = EnvUtils.getEnv("SOLR_URL_SCHEME", "http");
+    String host = EnvUtils.getEnv("SOLR_TOOL_HOST", "localhost");
+    String port = EnvUtils.getEnv("SOLR_PORT", "8983");
     return String.format(Locale.ROOT, "%s://%s:%s", scheme.toLowerCase(Locale.ROOT), host, port);
   }
 

solr/core/src/java/org/apache/solr/core/TracerConfigurator.java

@@ -23,6 +23,7 @@
 import java.util.Map;
 import org.apache.solr.common.SolrException;
 import org.apache.solr.common.util.NamedList;
+import org.apache.solr.util.EnvUtils;
 import org.apache.solr.util.plugin.NamedListInitializedPlugin;
 import org.apache.solr.util.tracing.SimplePropagator;
 import org.apache.solr.util.tracing.TraceUtils;
@@ -33,10 +34,10 @@
 public abstract class TracerConfigurator implements NamedListInitializedPlugin {
 
   public static final boolean TRACE_ID_GEN_ENABLED =
-      Boolean.parseBoolean(System.getProperty("solr.alwaysOnTraceId", "true"));
+      Boolean.parseBoolean(EnvUtils.getProp("solr.alwaysOnTraceId", "true"));
 
   private static final String DEFAULT_CLASS_NAME =
-      System.getProperty(
+      EnvUtils.getProp(
           "solr.otelDefaultConfigurator", "org.apache.solr.opentelemetry.OtelTracerConfigurator");
 
   private static final Logger log = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());

solr/core/src/java/org/apache/solr/pkg/PackageAPI.java

@@ -47,6 +47,7 @@
 import org.apache.solr.filestore.PackageStoreAPI;
 import org.apache.solr.request.SolrQueryRequest;
 import org.apache.solr.response.SolrQueryResponse;
+import org.apache.solr.util.EnvUtils;
 import org.apache.solr.util.SolrJacksonAnnotationInspector;
 import org.apache.zookeeper.KeeperException;
 import org.apache.zookeeper.WatchedEvent;
@@ -57,8 +58,7 @@
 
 /** This implements the public end points (/api/cluster/package) of package API. */
 public class PackageAPI {
-  public final boolean enablePackages =
-      Boolean.parseBoolean(System.getProperty("enable.packages", "false"));
+  public final boolean enablePackages = EnvUtils.getPropAsBool("enable.packages", false);
   private static final Logger log = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
 
   public static final String ERR_MSG =