Environment variables in logback.xml not working in native

[krisgerhard]

Variables in logback.xml are being replaced fine from application.properties but not from environment variables. Works in JVM mode but not in native mode.

[krisgerhard]

I actually observed this in production but managed to reproduce with integration tests.

Reproducer patch 👇 Command used to run tests: ./mvnw verify -Pnative-image -Dquarkus.native.container-build=true

Index: integration-tests/pom.xml
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
diff --git a/integration-tests/pom.xml b/integration-tests/pom.xml
--- a/integration-tests/pom.xml (revision 2640eed0ec467283dc4542da4ff19ed4006d3c31)
+++ b/integration-tests/pom.xml (date 1701419293942)
@@ -58,6 +58,9 @@
             <artifactId>maven-surefire-plugin</artifactId>
             <configuration>
               <skipTests>${native.surefire.skip}</skipTests>
+              <environmentVariables>
+                <LG_PRE>LOGBACK</LG_PRE>
+              </environmentVariables>
             </configuration>
           </plugin>
           <plugin>
@@ -74,6 +77,9 @@
                     <java.util.logging.manager>org.jboss.logmanager.LogManager</java.util.logging.manager>
                     <maven.home>${maven.home}</maven.home>
                   </systemPropertyVariables>
+                  <environmentVariables>
+                    <LG_PRE>LOGBACK</LG_PRE>
+                  </environmentVariables>
                 </configuration>
               </execution>
             </executions>
Index: integration-tests/src/main/resources/logback.xml
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
diff --git a/integration-tests/src/main/resources/logback.xml b/integration-tests/src/main/resources/logback.xml
--- a/integration-tests/src/main/resources/logback.xml  (revision 2640eed0ec467283dc4542da4ff19ed4006d3c31)
+++ b/integration-tests/src/main/resources/logback.xml  (date 1701287842133)
@@ -4,11 +4,11 @@
         <file>target/tests.log</file>
         <append>false</append>
         <encoder>
-            <pattern>LOGBACK- %-5level %msg %n</pattern>
+            <pattern>${lg.pre}- %-5level %msg%n</pattern>
         </encoder>
     </appender>

     <root level="trace">
         <appender-ref ref="FILE" />
     </root>
-</configuration>
\ No newline at end of file
+</configuration>

[krisgerhard]

Could be related to https://github.com/quarkusio/quarkus/issues/37273

[krisgerhard]

Or https://github.com/quarkusio/quarkus/issues/37444

[krisgerhard]

@stuartwdouglas Is there a way to set these values in runtime in native mode using env variables? As i understand config expansion is done during static initialization :/

[stuartwdouglas]

I think we would need to move logback initialization from static init to runtime init. I am not sure what the effects of such a change would be without trying it out.

[krisgerhard]

@stuartwdouglas Have you found time for this issue? :)

[krisgerhard]

Workaround is to supply this environment variable during build time.

In order to do it for container build, you need to pass quarkus.native.additional-build-args

1. export QUARKUS_NATIVE_ADDITIONAL_BUILD_ARGS="-J-Dlg.pre=LOGBACK"
2. quarkus.native.additional-build-args=-J-Dlg.pre=LOGBACK in application.properties etc.