[FIXED JENKINS-15587] Do not issue a warning about unparsable build timestamps...

[FIXED JENKINS-15587] Do not issue a warning about unparsable build timestamps if it is just a number, i.e. failed symlink.

core/src/main/java/hudson/model/Run.java

@@ -110,6 +110,7 @@ import org.kohsuke.stapler.export.Exported;
 import org.kohsuke.stapler.export.ExportedBean;
 
 import com.thoughtworks.xstream.XStream;
+import hudson.model.Run.RunExecution;
 import java.io.ByteArrayInputStream;
 import org.kohsuke.stapler.interceptor.RequirePOST;
 
@@ -340,7 +341,13 @@ public abstract class Run <JobT extends Job<JobT,RunT>,RunT extends Run<JobT,Run
             ((RunAction) a).onAttached(this);
     }
 
-    /*package*/ static long parseTimestampFromBuildDir(File buildDir) throws IOException {
+    static class InvalidDirectoryNameException extends IOException {
+        InvalidDirectoryNameException(File buildDir) {
+            super("Invalid directory name " + buildDir);
+        }
+    }
+
+    /*package*/ static long parseTimestampFromBuildDir(File buildDir) throws IOException, InvalidDirectoryNameException {
         try {
             if(Util.isSymlink(buildDir)) {
                 // "Util.resolveSymlink(file)" resolves NTFS symlinks. 
@@ -354,7 +361,7 @@ public abstract class Run <JobT extends Job<JobT,RunT>,RunT extends Run<JobT,Run
             buildDir = buildDir.getCanonicalFile();
             return ID_FORMATTER.get().parse(buildDir.getName()).getTime();
         } catch (ParseException e) {
-            throw new IOException2("[JENKINS-15587] Invalid directory name "+buildDir,e);
+            throw new InvalidDirectoryNameException(buildDir);
         } catch (InterruptedException e) {
             throw new IOException2("Interrupted while resolving symlink directory "+buildDir,e);
         }

core/src/main/java/hudson/model/RunMap.java

@@ -227,6 +227,17 @@ public final class RunMap<R extends Run<?,R>> extends AbstractLazyLoadRunMap<R>
                 if (LOGGER.isLoggable(FINE))
                     LOGGER.log(FINE,"Loaded " + b.getFullDisplayName(),new ThisIsHowItsLoaded());
                 return b;
+            } catch (Run.InvalidDirectoryNameException x) {
+                Level lvl;
+                try {
+                    Integer.parseInt(d.getName());
+                    // JENKINS-15587: just an mangled symlink
+                    lvl = Level.FINE;
+                } catch (NumberFormatException x2) {
+                    // potentially a real build dir, maybe a bug
+                    lvl = Level.WARNING;
+                }
+                LOGGER.log(lvl, "skipping non-build directory {0}", d);
             } catch (IOException e) {
                 LOGGER.log(Level.WARNING, "could not load " + d, e);
             } catch (InstantiationError e) {