Support for resuming builds

Author: jglick

src/main/java/org/jenkinsci/plugins/workflow/libs/LibraryAdder.java

@@ -99,13 +99,9 @@
         if (action != null) {
             // Resuming a build, so just look up what we loaded before.
             for (LibraryRecord record : action.getLibraries()) {
-                // TODO call LibraryRetriever.dir2Jar as needed
-                FilePath libDir = new FilePath(execution.getOwner().getRootDir()).child("libs/" + record.getDirectoryName());
-                for (String root : new String[] {"src", "vars"}) {
-                    FilePath dir = libDir.child(root);
-                    if (dir.isDirectory()) {
-                        additions.add(new Addition(dir.toURI().toURL(), record.trusted));
-                    }
+                FilePath libJar = new FilePath(execution.getOwner().getRootDir()).child("libs/" + record.getDirectoryName() + ".jar");
+                if (libJar.exists()) {
+                    additions.add(new Addition(libJar.toURI().toURL(), record.trusted));
                 }
                 String unparsed = librariesUnparsed.get(record.name);
                 if (unparsed != null) {

src/test/java/org/jenkinsci/plugins/workflow/libs/LibraryAdderTest.java

@@ -516,6 +516,8 @@ public void parallelBuildsDontInterfereWithExpiredCache() throws Throwable {
         // r.assertLogContains("Library library@master is cached. Copying from home.", f2.get());
     }
 
+    // TODO test migration in LibraryAdder.add after reload build started prior to dir2Jar (@OldData)
+
     @Issue("JENKINS-68544")
     @WithoutJenkins
     @Test public void className() {