From d0868cd1aec4b2af816cc1881f947e6020975489 Mon Sep 17 00:00:00 2001
From: mindless <mindless@71c3de6d-444a-0410-be80-ed276b4c234a>
Date: Mon, 16 Feb 2009 21:56:26 +0000
Subject: [PATCH] [FIXED HUDSON-2671] lock the SCMTrigger.getLock() in
 checkout() so polling won't occur while the checkout/update is in progress.

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@15377 71c3de6d-444a-0410-be80-ed276b4c234a
---
 .../java/hudson/model/AbstractProject.java    | 11 +++
 .../java/hudson/triggers/SCMTriggerTest.java  | 89 +++++++++++++++++++
 2 files changed, 100 insertions(+)
 create mode 100644 test/src/test/java/hudson/triggers/SCMTriggerTest.java

diff --git a/core/src/main/java/hudson/model/AbstractProject.java b/core/src/main/java/hudson/model/AbstractProject.java
index 67c1e2b825..babfe64003 100644
--- a/core/src/main/java/hudson/model/AbstractProject.java
+++ b/core/src/main/java/hudson/model/AbstractProject.java
@@ -750,7 +750,15 @@ public abstract class AbstractProject<P extends AbstractProject<P,R>,R extends A
         if(scm==null)
             return true;    // no SCM
 
+        // Acquire lock for SCMTrigger so poll won't run while we checkout/update
+        SCMTrigger scmt = getTrigger(SCMTrigger.class);
+        boolean locked = false;
         try {
+            if (scmt!=null) {
+                scmt.getLock().lockInterruptibly();
+                locked = true;
+            }
+
             FilePath workspace = getWorkspace();
             workspace.mkdirs();
 
@@ -759,6 +767,9 @@ public abstract class AbstractProject<P extends AbstractProject<P,R>,R extends A
             listener.getLogger().println(Messages.AbstractProject_ScmAborted());
             LOGGER.log(Level.INFO,build.toString()+" aborted",e);
             return false;
+        } finally {
+            if (locked)
+                scmt.getLock().unlock();
         }
     }
 
diff --git a/test/src/test/java/hudson/triggers/SCMTriggerTest.java b/test/src/test/java/hudson/triggers/SCMTriggerTest.java
new file mode 100644
index 0000000000..ff742e5899
--- /dev/null
+++ b/test/src/test/java/hudson/triggers/SCMTriggerTest.java
@@ -0,0 +1,89 @@
+/*
+ * The MIT License
+ * 
+ * Copyright (c) 2004-2009, Sun Microsystems, Inc., Kohsuke Kawaguchi
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+package hudson.triggers;
+
+import hudson.FilePath;
+import hudson.Launcher;
+import hudson.model.AbstractBuild;
+import hudson.model.AbstractProject;
+import hudson.model.BuildListener;
+import hudson.model.Cause;
+import hudson.model.FreeStyleBuild;
+import hudson.model.FreeStyleProject;
+import hudson.model.Hudson;
+import hudson.model.TaskListener;
+import hudson.scm.NullSCM;
+import org.jvnet.hudson.test.Bug;
+import org.jvnet.hudson.test.HudsonTestCase;
+import java.io.File;
+import java.io.IOException;
+import java.util.concurrent.Future;
+
+/**
+ * @author Alan Harder
+ */
+public class SCMTriggerTest extends HudsonTestCase {
+    /**
+     * Make sure that SCMTrigger doesn't trigger another build when a build has just started,
+     * but not yet completed its SCM update.
+     */
+    @Bug(2671)
+    public void testSimultaneousPollAndBuild() throws Exception {
+        FreeStyleProject p = createFreeStyleProject();
+        final Object notifier = new Object();
+        p.setScm(new TestSCM(notifier));
+        SCMTrigger.DESCRIPTOR.synchronousPolling = true;
+        SCMTrigger trigger = new SCMTrigger("0 0 1 1 0");
+        p.addTrigger(trigger);
+        trigger.start(p, true);
+
+        Future<FreeStyleBuild> build = p.scheduleBuild2(0, new Cause.UserCause());
+        // pollSCM as soon as build starts its checkout/update
+        synchronized (notifier) { notifier.wait(); }
+        trigger.run();
+        boolean result = Hudson.getInstance().getQueue().cancel(p);
+        build.get();  // let mock build finish
+        assertFalse("SCM-poll after build has started should wait until that build finishes SCM-update", result);
+    }
+
+    private static class TestSCM extends NullSCM {
+        private int myRev = 1;
+        private Object notifier;
+
+        private TestSCM(Object notifier) { this.notifier = notifier; }
+
+        @Override synchronized
+        public boolean pollChanges(AbstractProject project, Launcher launcher, FilePath dir, TaskListener listener) throws IOException {
+            return myRev < 2;
+        }
+
+        @Override
+        public boolean checkout(AbstractBuild build, Launcher launcher, FilePath remoteDir, BuildListener listener, File changeLogFile) throws IOException, InterruptedException {
+            synchronized (notifier) { notifier.notify(); }
+            Thread.sleep(400);  // processing time for mock update
+            synchronized (this) { if (myRev < 2) myRev = 2; }
+            return super.checkout(build, launcher, remoteDir, listener, changeLogFile);
+        }
+    }
+}
-- 
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