Adding ZFS migration support, but not activated for now.

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@15248 71c3de6d-444a-0410-be80-ed276b4c234a

core/pom.xml

@@ -632,6 +632,11 @@ THE SOFTWARE.
       <artifactId>libpam4j</artifactId>
       <version>1.1</version>
     </dependency>
+    <dependency>
+      <groupId>org.jvnet.libzfs</groupId>
+      <artifactId>libzfs</artifactId>
+      <version>0.2</version>
+    </dependency>
 
     <!-- offline profiler API to put in the classpath if we need it -->
     <!--dependency>

core/src/main/java/hudson/lifecycle/ZFSInstaller.java

+/*
+ * The MIT License
+ *
+ * Copyright (c) 2004-2009, Sun Microsystems, Inc.
+ *
+ * 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.lifecycle;
+
+import com.sun.akuma.Daemon;
+import com.sun.akuma.JavaVMArguments;
+import hudson.FilePath;
+import hudson.Launcher.LocalLauncher;
+import hudson.Util;
+import hudson.model.AdministrativeMonitor;
+import hudson.model.Hudson;
+import hudson.model.TaskListener;
+import hudson.util.HudsonIsRestarting;
+import hudson.util.StreamTaskListener;
+import hudson.util.ForkOutputStream;
+import static hudson.util.jna.GNUCLibrary.*;
+import org.jvnet.solaris.libzfs.LibZFS;
+import org.jvnet.solaris.libzfs.ZFSFileSystem;
+import org.jvnet.solaris.libzfs.ZFSPool;
+import org.jvnet.solaris.libzfs.ZFSType;
+import org.jvnet.solaris.mount.MountFlags;
+import org.kohsuke.stapler.StaplerRequest;
+import org.kohsuke.stapler.StaplerResponse;
+import org.apache.commons.io.output.ByteArrayOutputStream;
+
+import javax.servlet.ServletException;
+import java.io.File;
+import java.io.IOException;
+import java.io.PrintStream;
+import java.util.List;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+/**
+ * Encourages the user to migrate HUDSON_HOME on a ZFS file system. 
+ *
+ * @author Kohsuke Kawaguchi
+ * @since 1.283
+ */
+public class ZFSInstaller extends AdministrativeMonitor {
+    /**
+     * True if $HUDSON_HOME is a ZFS file system by itself.
+     */
+    private final boolean active = shouldBeActive();
+
+    /**
+     * This will be the file system name that we'll create.
+     */
+    private String prospectiveZfsFileSystemName;
+
+    public boolean isActivated() {
+        return active;
+    }
+
+    public boolean isRoot() {
+        return LIBC.geteuid()==0;
+    }
+
+    public String getProspectiveZfsFileSystemName() {
+        return prospectiveZfsFileSystemName;
+    }
+
+    private boolean shouldBeActive() {
+        if(!System.getProperty("os.name").equals("SunOS"))
+            // on systems that don't have ZFS, we don't need this monitor
+            return false;
+
+        try {
+            LibZFS zfs = new LibZFS();
+            List<ZFSPool> roots = zfs.roots();
+            if(roots.isEmpty())
+                return false;       // no active ZFS pool
+
+            // if we don't run on a ZFS file system, activate
+            ZFSFileSystem hudsonZfs = zfs.getFileSystemByMountPoint(Hudson.getInstance().getRootDir());
+            if(hudsonZfs!=null)
+                return false;       // already on ZFS
+
+            // decide what file system we'll create
+            ZFSPool pool = roots.get(0);
+            prospectiveZfsFileSystemName = computeHudsonFileSystemName(zfs,pool);
+
+            return true;
+        } catch (Exception e) {
+            LOGGER.log(Level.WARNING, "Failed to detect whether Hudson is on ZFS",e);
+            return false;
+        }
+    }
+
+    /**
+     * Called from the management screen.
+     */
+    public void doAct(StaplerRequest req, StaplerResponse rsp) throws ServletException, IOException {
+        requirePOST();
+        Hudson.getInstance().checkPermission(Hudson.ADMINISTER);
+
+        if(req.hasParameter("n")) {
+            // we'll shut up
+            disable(true);
+            rsp.sendRedirect2(req.getContextPath());
+            return;
+        }
+
+        rsp.sendRedirect2("confirm");
+    }
+
+    /**
+     * Called from the confirmation screen to actually initiate the migration.
+     */
+    public void doStart(StaplerRequest req, StaplerResponse rsp) throws ServletException, IOException {
+        requirePOST();
+        Hudson hudson = Hudson.getInstance();
+        hudson.checkPermission(Hudson.ADMINISTER);
+
+        hudson.servletContext.setAttribute("app",new HudsonIsRestarting());
+        // redirect the user to the manage page
+        rsp.sendRedirect2(req.getContextPath()+"/manage");
+
+        // asynchronously restart, so that we can give a bit of time to the browser to load "restarting..." screen.
+        new Thread("restart thread") {
+            @Override
+            public void run() {
+                try {
+                    Thread.sleep(5000);
+
+                    // close all descriptors on exec except stdin,out,err
+                    int sz = LIBC.getdtablesize();
+                    for(int i=3; i<sz; i++) {
+                        int flags = LIBC.fcntl(i, F_GETFD);
+                        if(flags<0) continue;
+                        LIBC.fcntl(i, F_SETFD,flags| FD_CLOEXEC);
+                    }
+
+                    JavaVMArguments args = JavaVMArguments.current();
+                    args.setSystemProperty(ZFSInstaller.class.getName(),"migrate");
+                    Daemon.selfExec(args);
+                } catch (InterruptedException e) {
+                    LOGGER.log(Level.SEVERE, "Restart failed",e);
+                } catch (IOException e) {
+                    LOGGER.log(Level.SEVERE, "Restart failed",e);
+                }
+            }
+        }.start();
+    }
+
+
+    public static void init() {
+        List<AdministrativeMonitor> monitors = Hudson.getInstance().administrativeMonitors;
+
+        if("migrate".equals(System.getProperty(ZFSInstaller.class.getName()))) {
+            ByteArrayOutputStream out = new ByteArrayOutputStream();
+            StreamTaskListener listener = new StreamTaskListener(new ForkOutputStream(System.out, out));
+            try {
+                if(migrate(listener)) {
+                    // completed successfully
+                    monitors.add(new MigrationCompleteNotice());
+                    return;
+                }
+            } catch (IOException e) {
+                e.printStackTrace(listener.error("Migration failed"));
+            } catch (InterruptedException e) {
+                e.printStackTrace(listener.error("Migration failed"));
+            }
+            // migration failed
+            monitors.add(new MigrationFailedNotice(out));
+            return;
+        }
+
+        if(System.getProperty(ZFSInstaller.class.getName())!=null)
+            // this feature is still being tested, so only activate this during a test
+            monitors.add(new ZFSInstaller());
+    }
+
+    /**
+     * Migrates $HUDSON_HOME to a new ZFS file system.
+     *
+     * TODO: do this in a separate JVM to elevate the privilege.
+     *
+     * @param listener
+     *      Log of migration goes here.
+     * @return
+     *      false if a migration failed.
+     */
+    private static boolean migrate(TaskListener listener) throws IOException, InterruptedException {
+        PrintStream out = listener.getLogger();
+
+        File home = Hudson.getInstance().getRootDir();
+        // do the migration
+        LibZFS zfs = new LibZFS();
+        ZFSFileSystem existing = zfs.getFileSystemByMountPoint(home);
+        if(existing!=null) {
+            out.println(home+" is already on ZFS. Doing nothing");
+            return true;
+        }
+
+        File tmpDir = Util.createTempDir();
+
+        // mount a new file system to a temporary location
+        String name = computeHudsonFileSystemName(zfs, zfs.roots().get(0));
+        out.println("Creating "+name);
+        ZFSFileSystem hudson = (ZFSFileSystem)zfs.create(name, ZFSType.FILESYSTEM);
+        hudson.setMountPoint(tmpDir);
+        hudson.mount();
+
+        // copy all the files
+        out.println("Copying all existing data files");
+        if(system(home,listener, "/usr/bin/cp","-pR",".", tmpDir.getAbsolutePath())!=0) {
+            out.println("Failed to copy "+home+" to "+tmpDir);
+            return false;
+        }
+
+        // unmount
+        out.println("Unmounting "+name);
+        hudson.unmount(MountFlags.MS_FORCE);
+
+        // move the original directory to the side
+        File backup = new File(home.getPath()+".backup");
+        out.println("Moving "+home+" to "+backup);
+        if(!home.renameTo(backup)) {
+            out.println("Failed to move your current data "+home+" out of the way");
+        }
+
+        // update the mount point
+        out.println("Creating a new mount point at "+home);
+        if(!home.mkdir())
+            throw new IOException("Failed to create mount point "+home);
+
+        out.println("Mounting "+name);
+        hudson.setMountPoint(home);
+        hudson.mount();
+
+        // delete back up
+        out.println("Deleting "+backup);
+        if(system(new File("/"),listener,"/usr/bin/rm","-rf",backup.getAbsolutePath())!=0) {
+            out.println("Failed to delete "+home+" to "+tmpDir);
+            return false;
+        }
+
+        out.println("Migration completed");
+        return true;
+    }
+
+    private static int system(File pwd, TaskListener listener, String... args) throws IOException, InterruptedException {
+        return new LocalLauncher(listener).launch(args, new String[0], System.out, new FilePath(pwd)).join();
+    }
+
+    private static String computeHudsonFileSystemName(LibZFS zfs, ZFSPool pool) {
+        if(!zfs.exists(pool.getName()+"/hudson"))
+            return pool.getName()+"/hudson";
+        for( int i=2; ; i++ ) {
+            String name = pool.getName() + "/hudson" + i;
+            if(!zfs.exists(name))
+                return name;
+        }
+    }
+
+    /**
+     * Used to indicate that the migration was completed successfully.
+     */
+    public static final class MigrationCompleteNotice extends AdministrativeMonitor {
+        public boolean isActivated() {
+            return true;
+        }
+    }
+
+    /**
+     * Used to indicate a failure in the migration.
+     */
+    public static final class MigrationFailedNotice extends AdministrativeMonitor {
+        ByteArrayOutputStream record;
+
+        MigrationFailedNotice(ByteArrayOutputStream record) {
+            this.record = record;
+        }
+
+        public boolean isActivated() {
+            return true;
+        }
+        
+        public String getLog() {
+            return record.toString();
+        }
+    }
+
+    private static final Logger LOGGER = Logger.getLogger(ZFSInstaller.class.getName());
+}

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

@@ -43,6 +43,7 @@ import hudson.UDPBroadcastThread;
 import hudson.logging.LogRecorderManager;
 import hudson.lifecycle.WindowsInstallerLink;
 import hudson.lifecycle.Lifecycle;
+import hudson.lifecycle.ZFSInstaller;
 import hudson.model.Descriptor.FormException;
 import hudson.model.listeners.ItemListener;
 import hudson.model.listeners.JobListener;
@@ -470,6 +471,7 @@ public final class Hudson extends AbstractModelObject implements ItemGroup<TopLe
 
         // run the init code of SubversionSCM before we load plugins so that plugins can change SubversionWorkspaceSelector.
         SubversionSCM.DescriptorImpl.DESCRIPTOR.getDisplayName();
+        ZFSInstaller.init();
 
         // load plugins.
         pluginManager = new PluginManager(context);
@@ -1200,6 +1202,16 @@ public final class Hudson extends AbstractModelObject implements ItemGroup<TopLe
         }
     }
 
+    /**
+     * Binds {@link AdministrativeMonitor}s to URL.
+     */
+    public AdministrativeMonitor getAdministrativeMonitor(String id) {
+        for (AdministrativeMonitor m : administrativeMonitors)
+            if(m.id.equals(id))
+                return m;
+        return null;
+    }
+
     public NodeDescriptor getDescriptor() {
         return DescriptorImpl.INSTANCE;
     }

core/src/main/java/hudson/util/jna/GNUCLibrary.java

@@ -43,12 +43,23 @@ public interface GNUCLibrary extends Library {
     int geteuid();
     int getppid();
     int chdir(String dir);
+    int getdtablesize();
+
     int execv(String file, StringArray args);
     int setenv(String name, String value);
     int unsetenv(String name);
     void perror(String msg);
     String strerror(int errno);
 
+    int fcntl(int fd, int command);
+    int fcntl(int fd, int command, int flags);
+
+    // obtained from Linux. Needs to be checked if these values are portable.
+    static final int F_GETFD = 1;
+    static final int F_SETFD = 2;
+    static final int FD_CLOEXEC = 1;
+    
+
     // this is listed in http://developer.apple.com/DOCUMENTATION/Darwin/Reference/ManPages/man3/sysctlbyname.3.html
     // but not in http://www.gnu.org/software/libc/manual/html_node/System-Parameters.html#index-sysctl-3493
     // perhaps it is only supported on BSD?

core/src/main/resources/hudson/lifecycle/ZFSInstaller/MigrationCompleteNotice/message.jelly

+<!--
+The MIT License
+
+Copyright (c) 2004-2009, Sun Microsystems, Inc.
+
+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.
+-->
+
+<j:jelly xmlns:j="jelly:core" xmlns:st="jelly:stapler" xmlns:d="jelly:define" xmlns:l="/lib/layout" xmlns:t="/lib/hudson" xmlns:f="/lib/form">
+  <div class="info">
+    <form method="post" action="${rootURL}/${it.url}/disable">
+      ${%Data was successfully migrated to ZFS.}
+      <f:submit value="${%OK}"/>
+    </form>
+  </div>
+</j:jelly>
\ No newline at end of file

core/src/main/resources/hudson/lifecycle/ZFSInstaller/MigrationFailedNotice/index.jelly

+<!--
+The MIT License
+
+Copyright (c) 2004-2009, Sun Microsystems, Inc.
+
+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.
+-->
+<j:jelly xmlns:j="jelly:core" xmlns:st="jelly:stapler" xmlns:d="jelly:define" xmlns:l="/lib/layout" xmlns:t="/lib/hudson" xmlns:f="/lib/form" xmlns:i="jelly:fmt">
+  <l:layout title="${%ZFS Migration Problem}">
+    <l:main-panel>
+      <h1>${%ZFS Migration Problem}</h1>
+      <pre><st:out value="${it.log}" /></pre>
+    </l:main-panel>
+  </l:layout>
+</j:jelly>

core/src/main/resources/hudson/lifecycle/ZFSInstaller/MigrationFailedNotice/message.jelly

+<!--
+The MIT License
+
+Copyright (c) 2004-2009, Sun Microsystems, Inc.
+
+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.
+-->
+
+<j:jelly xmlns:j="jelly:core" xmlns:st="jelly:stapler" xmlns:d="jelly:define" xmlns:l="/lib/layout" xmlns:t="/lib/hudson" xmlns:f="/lib/form">
+  <div class="error">
+    ${%ZFS migration failed.}
+    <a href="${it.url}/">See the log for more details</a>.
+  </div>
+</j:jelly>
\ No newline at end of file

core/src/main/resources/hudson/lifecycle/ZFSInstaller/confirm.jelly

+<!--
+The MIT License
+
+Copyright (c) 2004-2009, Sun Microsystems, Inc.
+
+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.
+-->
+
+<j:jelly xmlns:j="jelly:core" xmlns:st="jelly:stapler" xmlns:d="jelly:define" xmlns:l="/lib/layout" xmlns:t="/lib/hudson" xmlns:f="/lib/form">
+  <l:layout title="${%ZFS file system creation}">
+    <l:header />
+    <l:side-panel />
+    <l:main-panel>
+      <h1>${%ZFS file system creation}</h1>
+      <div>
+        ${%blurb}
+
+        <j:if test="${!it.isRoot()}">
+          <div class="warning">
+            ${%You'll need the root password of the system to do this.}
+          </div>
+        </j:if>
+        <ol>
+          <li>${%Restart itself so that the migration can be done without worrying about concurrent data modifications}</li>
+          <li>${%create(it.prospectiveZfsFileSystemName)}</li>
+          <li>${%rename(app.rootDir)}</li>
+          <li>${%mount(app.rootDir)}</li>
+          <li>${%delete(app.rootDir)}</li>
+        </ol>
+
+        <form action="start" method="post">
+          <f:submit value="${%Start migration}" />
+        </form>
+      </div>
+    </l:main-panel>
+  </l:layout>
+</j:jelly>
\ No newline at end of file

core/src/main/resources/hudson/lifecycle/ZFSInstaller/confirm.properties

+# 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.
+
+blurb=Hudson will perform the following steps to migrate your existing data to a ZFS file system.
+create=Create a new ZFS file system <tt>{0}</tt> and copy all the data into it
+rename=Rename <tt>{0}</tt> to <tt>{0}.backup</tt>
+mount=Mount a new ZFS file system at <tt>{0}</tt>
+delete=Delete <tt>{0}.backup</tt>
\ No newline at end of file

core/src/main/resources/hudson/lifecycle/ZFSInstaller/message.jelly

+<!--
+The MIT License
+
+Copyright (c) 2004-2009, Sun Microsystems, Inc.
+
+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.
+-->
+
+<j:jelly xmlns:j="jelly:core" xmlns:st="jelly:stapler" xmlns:d="jelly:define" xmlns:l="/lib/layout" xmlns:t="/lib/hudson" xmlns:f="/lib/form">
+  <div class="warning">
+    <form method="post" action="${rootURL}/${it.url}/act">
+      <p>${%blurb}</p>
+      <div style="margin-left:2em">
+        <f:submit name="y" value="${%Yes, please}"/>
+        <f:submit name="n" value="${%No, thank you}"/>
+      </div>
+    </form>
+  </div>
+</j:jelly>
\ No newline at end of file

core/src/main/resources/hudson/lifecycle/ZFSInstaller/message.properties

+# 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.
+
+blurb=You are running on Solaris. Would you like Hudson to create a ZFS file system for you \
+  so that you can get the most out of Solaris?
\ No newline at end of file