olamy commented on code in PR #522:
URL: 
https://github.com/apache/maven-build-cache-extension/pull/522#discussion_r3754501600


##########
src/main/java/org/apache/maven/buildcache/BuildCacheMojosExecutionStrategy.java:
##########
@@ -116,8 +116,23 @@ public void execute(
             // so forks should rerun too
             boolean forkedExecution = 
lifecyclePhasesHelper.isForkedProject(project);
             String projectName = getVersionlessProjectKey(project);
+            // Full caching (look up, restore and save) applies to a normal 
lifecycle build, or to goals typed
+            // on the command line when they all map to a real phase after 
clean (e.g. mvn compiler:compile).
+            boolean cacheEligible = !forkedExecution
+                    && (source == Source.LIFECYCLE
+                            || (source == Source.CLI
+                                    && cacheConfig.isCacheSingleGoal()
+                                    && 
isCacheableCliInvocation(mojoExecutions)));
+            // When a command-line goal forks a lifecycle (e.g. jetty:run 
forks test-compile via
+            // @Execute(phase=...)), let that fork restore from cache but 
never save. We skip forks that happen
+            // inside a normal build: that build already handles caching, and 
joining in would just cause an
+            // extra, pointless cache lookup (see ForkedExecutionsTest / 
ForkedExecutionCoreExtensionTest).
+            boolean forkedRestoreEligible = forkedExecution
+                    && cacheConfig.isRestoreForkedExecutions()
+                    && source == Source.LIFECYCLE
+                    && isCliOriginatedFork(project);

Review Comment:
   good catch. But the fix is not as easy as this single change



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