From 6ea7883fed497b68eec9f89ec89082edf1b39ce5 Mon Sep 17 00:00:00 2001
From: Stephen Connolly <stephen.alan.connolly@gmail.com>
Date: Thu, 28 Jul 2016 16:09:21 +0100
Subject: [PATCH] [FIXED JENKINS-37041] Ensure that detached plugins are always
 at least their minimum version

(cherry picked from commit 2a450e5ac2ecd83a54f05c83729852073601816e)
---
 .../java/hudson/ClassicPluginStrategy.java    | 10 +++++++
 core/src/main/java/hudson/PluginManager.java  | 28 +++++++++++++++++++
 2 files changed, 38 insertions(+)

diff --git a/core/src/main/java/hudson/ClassicPluginStrategy.java b/core/src/main/java/hudson/ClassicPluginStrategy.java
index 7164ffeef6..a1a1b57c49 100644
--- a/core/src/main/java/hudson/ClassicPluginStrategy.java
+++ b/core/src/main/java/hudson/ClassicPluginStrategy.java
@@ -401,6 +401,16 @@ public class ClassicPluginStrategy implements PluginStrategy {
         public VersionNumber getSplitWhen() {
             return splitWhen;
         }
+
+        /**
+         * Gets the minimum required version for the current version of Jenkins.
+         *
+         * @return the minimum required version for the current version of Jenkins.
+         * @sice 2.16
+         */
+        public VersionNumber getRequireVersion() {
+            return new VersionNumber(requireVersion);
+        }
     }
 
     private static final List<DetachedPlugin> DETACHED_LIST = Collections.unmodifiableList(Arrays.asList(
diff --git a/core/src/main/java/hudson/PluginManager.java b/core/src/main/java/hudson/PluginManager.java
index 1ee23f30dd..793508aba4 100644
--- a/core/src/main/java/hudson/PluginManager.java
+++ b/core/src/main/java/hudson/PluginManager.java
@@ -715,6 +715,34 @@ public abstract class PluginManager extends AbstractModelObject implements OnMas
                     new Object[] {lastExecVersion, Jenkins.VERSION, loadedDetached});
 
             InstallUtil.saveLastExecVersion();
+        } else {
+            final Set<ClassicPluginStrategy.DetachedPlugin> forceUpgrade = new HashSet<>();
+            for (ClassicPluginStrategy.DetachedPlugin p : ClassicPluginStrategy.getDetachedPlugins()) {
+                VersionNumber installedVersion = getPluginVersion(rootDir, p.getShortName());
+                VersionNumber requireVersion = p.getRequireVersion();
+                if (installedVersion != null && installedVersion.isOlderThan(requireVersion)) {
+                    LOGGER.log(Level.WARNING,
+                            "Detached plugin {0} found at version {1}, required minimum version is {2}",
+                            new Object[]{p.getShortName(), installedVersion, requireVersion});
+                    forceUpgrade.add(p);
+                }
+            }
+            if (!forceUpgrade.isEmpty()) {
+                Set<String> loadedDetached = loadPluginsFromWar("/WEB-INF/detached-plugins", new FilenameFilter() {
+                    @Override
+                    public boolean accept(File dir, String name) {
+                        name = normalisePluginName(name);
+                        for (ClassicPluginStrategy.DetachedPlugin detachedPlugin : forceUpgrade) {
+                            if (detachedPlugin.getShortName().equals(name)) {
+                                return true;
+                            }
+                        }
+                        return false;
+                    }
+                });
+                LOGGER.log(INFO, "Upgraded detached plugins (and dependencies): {0}",
+                        new Object[]{loadedDetached});
+            }
         }
     }