contrib: Update talk.
authorRichard W.M. Jones <rjones@redhat.com>
Tue, 1 Nov 2011 17:51:00 +0000 (17:51 +0000)
committerRichard W.M. Jones <rjones@redhat.com>
Tue, 1 Nov 2011 17:51:00 +0000 (17:51 +0000)
contrib/intro/libguestfs-intro.html
contrib/intro/talk.txt
contrib/intro/virt-manager-t.png [new file with mode: 0644]
contrib/intro/virt-manager.png [new file with mode: 0644]
contrib/intro/vmm-icons-t.png [new file with mode: 0644]
contrib/intro/vmm-icons.png [new file with mode: 0644]
contrib/intro/win7.xml [new file with mode: 0644]

index cfc7b8b..adbe572 100644 (file)
@@ -7,7 +7,7 @@
         counter-reset: chapter;
       }
 
-      body p {
+      body > p, body > img, body > pre, body > table {
         margin-left: 2em;
       }
 
@@ -26,8 +26,7 @@
       }
 
       h2 {
-        background-color: #f3f3f3;
-        margin-top: 2em;
+        margin-top: 4em;
         color: rgb(204,0,0);
         counter-increment: chapter;
         counter-reset: section;
       h2:before {
         font-size: 80%;
         color: #666;
-        content: counter(chapter) "  ";
+        content: counter(chapter) " ... ";
       }
 
       pre {
         background-color: #fcfcfc;
-        border-top: 1px dotted #888;
-        border-bottom: 1px dotted #888;
-        border-left: 6px solid rgb(204,0,0);
+        border-top: 1px dotted #eee;
+        border-bottom: 1px dotted #eee;
+        border-left: 2px solid rgb(204,0,0);
         padding: 5px;
         margin-left: 1em;
       }
 
       p.sourcelnk {
-        text-align: right;
+        text-align: left;
         font-size: 70%;
       }
     </style>
@@ -89,7 +88,7 @@ free (fstype);
     <table width="100%">
       <tr><td valign="top">
 
-<pre style="font-size: 80%;">
+<pre>
   ("<b>vfs_type</b>",
    (RString "fstype",
         [Device "device"], []),
@@ -110,7 +109,7 @@ For example a string such as C&lt;ext3&gt; or C&lt;ntfs&gt;.");
         </td>
         <td valign="top">
 
-<pre style="font-size: 80%;">
+<pre>
 char *
 <b>do_vfs_type</b> (const char *device)
 {
@@ -175,7 +174,7 @@ get_blkid_tag (const char *device, const char *tag)
     <img src="tools.svg" />
 
     <table>
-      <tr><td valign="top">
+      <tr><td valign="top" style="padding-bottom: 1.5em;">
 <pre>
 <b>guestfish -N fs -m /dev/sda1 &lt;&lt;EOF</b>
   <font style="color: green;">mkdir /etc
@@ -212,6 +211,80 @@ F15x32:/dev/vg_f15x32/lv_root 5.5G  3.4G      1.8G  63%
 
     <h2>Inspection</h2>
 
+<pre>
+$ <b>virt-inspector -c qemu:///system -d Win7x32</b>
+
+<font style="color: #888;">&lt;?xml version="1.0"?&gt;</font>
+<font style="color: #888;">&lt;operatingsystems&gt;</font>
+  <font style="color: #888;">&lt;operatingsystem&gt;</font>
+    <font style="color: #888;">&lt;root&gt;</font>/dev/sda2<font style="color: #888;">&lt;/root&gt;</font>
+    <font style="color: #888;">&lt;name&gt;</font>windows<font style="color: #888;">&lt;/name&gt;</font>
+    <font style="color: #888;">&lt;arch&gt;</font>i386<font style="color: #888;">&lt;/arch&gt;</font>
+    <font style="color: #888;">&lt;distro&gt;</font>windows<font style="color: #888;">&lt;/distro&gt;</font>
+    <font style="color: #888;">&lt;product_name&gt;</font>Windows 7 Enterprise<font style="color: #888;">&lt;/product_name&gt;</font>
+    <font style="color: #888;">&lt;product_variant&gt;</font>Client<font style="color: #888;">&lt;/product_variant&gt;</font>
+    <font style="color: #888;">&lt;major_version&gt;</font>6<font style="color: #888;">&lt;/major_version&gt;</font>
+    <font style="color: #888;">&lt;minor_version&gt;</font>1<font style="color: #888;">&lt;/minor_version&gt;</font>
+    <font style="color: #888;">&lt;windows_systemroot&gt;</font>/Windows<font style="color: #888;">&lt;/windows_systemroot&gt;</font>
+    <font style="color: #888;">&lt;windows_current_control_set&gt;</font>ControlSet001<font style="color: #888;">&lt;/windows_current_control_set&gt;</font>
+    <font style="color: #888;">&lt;hostname&gt;</font>win7x32<font style="color: #888;">&lt;/hostname&gt;</font>
+<i>... etc ...</i>
+</pre>
+<p class="sourcelnk"><a href="win7.xml">full&nbsp;XML&nbsp;...</a></p>
+
+    <table>
+      <tr><td colspan="2" align="middle">
+          <small><i>Click to enlarge the images</i></small>
+      </td></tr>
+      <tr><td width="50%">
+          <a href="virt-manager.png"><img src="virt-manager-t.png"></a>
+        </td><td width="50%" align="middle" valign="top">
+          <a href="vmm-icons.png"><img src="vmm-icons-t.png"></a>
+      </td></tr>
+    </table>
+
+<pre>
+  char **roots;
+  size_t i;
+  char *type, *distro, *product_name;
+  int major, minor;
+
+  roots = <b>guestfs_inspect_os</b> (g);
+
+  if (roots == NULL)
+    exit (EXIT_FAILURE);
+
+  if (roots[0] == NULL) {
+    fprintf (stderr, "no operating systems found\n");
+    exit (EXIT_FAILURE);
+  }
+
+  for (i = 0; roots[i] != NULL; ++i) {
+    type = <b>guestfs_inspect_get_type</b> (g, roots[i]);
+    distro = <b>guestfs_inspect_get_distro</b> (g, roots[i]);
+    product_name = <b>guestfs_inspect_get_product_name</b> (g, roots[i]);
+    major = <b>guestfs_inspect_get_major_version</b> (g, roots[i]);
+    minor = <b>guestfs_inspect_get_minor_version</b> (g, roots[i]);
+
+    printf ("Root: %s\n"
+            "  Type: %s\n"
+            "  Distro: %s\n"
+            "  Version: %d.%d\n"
+            "  Product name: %s\n\n");
+            roots[i],
+            type ? : "unknown", distro ? : "unknown", major, minor,
+            product_name ? : "");
+
+    free (type);
+    free (distro);
+    free (product_name);
+    free (roots[i]);
+  }
+
+  free (roots);
+</pre>
+<p class="sourcelnk"><a href="http://git.annexia.org/?p=libguestfs.git;a=blob;f=rescue/virt-rescue.c;h=0c0036460434f1365d9591d6b2b805d999b07056;hb=HEAD#l351">full&nbsp;source&nbsp;...</a></p>
+
 
 
 
index a8632f6..d28bcc4 100644 (file)
@@ -5,3 +5,133 @@ distributed before the talk.
 
 ----------------------------------------------------------------------
 
+[1 The Idea]
+
+The "big idea" behind libguestfs is to read and write disk
+images by reusing all the qemu, Linux kernel and userspace
+code.
+
+This gives us tremendous power in a relatively small
+library: we can handle all Linux filesystems, all Windows
+filesystems, LVM, BSD, containers like raw and qcow, CD ISOs,
+USB keys, regular hard disks, and lots more.
+
+If you give us a btrfs filesystem in a BSD partition wrapped
+in a qcow2 file -- that is something we can handle.
+
+libguestfs -- as the name suggests -- is a plain, ordinary
+shared library written in C that you can link to C programs.
+You're all very smart people and you will have guessed
+already that we don't in fact run qemu as a library inside
+libguestfs as this diagram suggests.  Instead we fork
+qemu or KVM, running a small "appliance" which has
+the usual kernel, a small Linux distribution with tools
+like mkfs, lvcreate and parted, and a libguestfs daemon.
+The library and the daemon talk to each other over a
+virtio-serial connection.
+
+The qemu instance is connected to the disks we are
+examining using the ordinary qemu -drive option.
+
+[2 The Stable API]
+
+Consider how you might send commands to the daemon.
+Example: Create a filesystem (mkfs).
+
+One thing you might do is to send shell commands over
+the virtio-serial connection.  It would send "mkfs -t ..."
+
+This is something that is possible using the libguestfs
+API, but we don't encourage it.  There are three reasons
+why we don't encourage and support this: one is that
+because we're calling this from a C program, it's hard
+to construct shell commands and deal with quoting issues.
+Secondly it's hard to parse the result from commands
+(think about parted or lvs which are two commands that
+produce quite complex output that is hard to parse).
+Thirdly the command line isn't very long-term stable,
+with some commands appearing and changing over time.
+
+I'd emphasize again that we do let you send shell
+commands over to the daemon if that's what you want to do.
+
+What we support, though, is a long-term stable API and ABI.
+It's slightly (but not very much) higher level than shell
+commands.
+
+I've got an example on the page.  This is the guestfs_vfs_type
+API which returns the name of the filesystem on a device.
+
+Like libvirt, we are serious about the long term stability
+of the API and ABI, and if you write your program against
+this API, you'll never have to change the program or even
+recompile it.
+
+Because there are 100s of commands that you might want to
+run, we made it exceptionally simple to add new APIs.
+Shown below is the actual code used to implement "vfs-type".
+
+On the right is the code fragment that runs in the daemon.
+This is a short C function which handles constructing the
+command line and parsing out the result.  Although there
+is parsing code here, the good thing is that it only exists
+in one place, and we can update it from time to time if
+the underlying shell commands change.
+
+On the left is the metadata for this API function.  It
+has a description of the parameters and return value,
+some tests (not shown), and a fragment of documentation.
+
+That's ALL you have to write.  From that, we generate
+header files, bindings in all the different languages,
+RPC for the virtio-serial connection, documentation, etc.
+Currently we generate about a quarter of a million lines
+of code and documentation.
+
+[3 Tools written around the API]
+
+Around this stable API, myself and the libguestfs team
+have written a number of tools.  There are also people
+in the community writing other tools.
+
+A few of them are shown on this diagram, in fact there
+are many more than are shown here.
+
+Starting at the top, "guestfish" is a shell for the API,
+letting you write simple shell scripts.  If you look at
+the code examples below, you can see a small guestfish
+script that creates a new raw format partitioned filesystem
+with some content.
+
+Going round clockwise:
+
+The libguestfs API is a mix of high-level calls like
+mkfs, lvremove, vfs-type; and also low level POSIX calls
+like mkdir and writing to files.
+"guestmount" lets you mount an existing filesystem from
+a guest and access it as a regular mountpoint on the host.
+guestmount intelligently caches and prefetches data so it's
+quite usable and fast from the command line or graphical
+programs like the GNOME Nautilus file browser.
+
+"virt-rescue" lets you use the appliance directly, and
+it's a useful way to rescue guests by hand.
+You just want to hammer out some shell commands manually.
+
+"virt-win-reg" lets you read and write Windows Registry
+entries.  There is a rather complex example below right.
+
+Now we come round to the "inspection" tools, and these
+three tools let you inspect an unknown guest to find out
+what operating system it contains, what applications are
+installed, what filesystems, how the filesystems are used
+and much more.  I cover that in the next section, but if
+you look below you'll see an example of running "virt-df".
+
+Finally there are now tools to resize guests, make them
+sparse, align them, and check their alignment.  These
+last tools are ones that we eventually hope will become
+obsolete.
+
+[4 Inspection]
+
diff --git a/contrib/intro/virt-manager-t.png b/contrib/intro/virt-manager-t.png
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diff --git a/contrib/intro/vmm-icons-t.png b/contrib/intro/vmm-icons-t.png
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diff --git a/contrib/intro/vmm-icons.png b/contrib/intro/vmm-icons.png
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diff --git a/contrib/intro/win7.xml b/contrib/intro/win7.xml
new file mode 100644 (file)
index 0000000..05c484f
--- /dev/null
@@ -0,0 +1,164 @@
+<?xml version="1.0"?>
+<operatingsystems>
+  <operatingsystem>
+    <root>/dev/sda2</root>
+    <name>windows</name>
+    <arch>i386</arch>
+    <distro>windows</distro>
+    <product_name>Windows 7 Enterprise</product_name>
+    <product_variant>Client</product_variant>
+    <major_version>6</major_version>
+    <minor_version>1</minor_version>
+    <windows_systemroot>/Windows</windows_systemroot>
+    <windows_current_control_set>ControlSet001</windows_current_control_set>
+    <hostname>win7x32</hostname>
+    <format>installed</format>
+    <mountpoints>
+      <mountpoint dev="/dev/sda2">/</mountpoint>
+    </mountpoints>
+    <filesystems>
+      <filesystem dev="/dev/sda2">
+        <type>ntfs</type>
+        <uuid>F2E8996AE8992E3B</uuid>
+      </filesystem>
+    </filesystems>
+    <drive_mappings>
+      <drive_mapping name="C">/dev/sda2</drive_mapping>
+    </drive_mappings>
+    <applications>
+      <application>
+        <name>Microsoft .NET Framework 4 Client Profile</name>
+        <display_name>Microsoft .NET Framework 4 Client Profile</display_name>
+        <version>4.0.30319</version>
+        <install_path>C:\Windows\Microsoft.NET\Framework\v4.0.30319\SetupCache\Client</install_path>
+        <publisher>Microsoft Corporation</publisher>
+        <url>http://go.microsoft.com/fwlink/?LinkId=164164</url>
+      </application>
+      <application>
+        <name>Mozilla Firefox (3.6.12)</name>
+        <display_name>Mozilla Firefox (3.6.12)</display_name>
+        <version>3.6.12 (en-GB)</version>
+        <install_path>C:\Program Files\Mozilla Firefox</install_path>
+        <publisher>Mozilla</publisher>
+        <url>http://www.mozilla.com/en-GB/</url>
+        <description>Mozilla Firefox</description>
+      </application>
+      <application>
+        <name>VLC media player</name>
+        <display_name>VLC media player 1.1.5</display_name>
+        <version>1.1.5</version>
+        <install_path>C:\Program Files\VideoLAN\VLC</install_path>
+        <publisher>VideoLAN</publisher>
+        <url>http://www.videolan.org/</url>
+      </application>
+      <application>
+        <name>{3C3901C5-3455-3E0A-A214-0B093A5070A6}</name>
+        <display_name>Microsoft .NET Framework 4 Client Profile</display_name>
+        <version>4.0.30319</version>
+        <publisher>Microsoft Corporation</publisher>
+        <url>http://go.microsoft.com/fwlink/?LinkId=164164</url>
+      </application>
+      <application>
+        <name>{3C3901C5-3455-3E0A-A214-0B093A5070A6}.KB2468871</name>
+        <display_name>Update for Microsoft .NET Framework 4 Client Profile (KB2468871)</display_name>
+        <version>1</version>
+        <publisher>Microsoft Corporation</publisher>
+        <url>http://support.microsoft.com</url>
+        <description>This update is for Microsoft .NET Framework 4 Client Profile.&#13;
+If you later install a more recent service pack, this update will be uninstalled automatically.&#13;
+For more information, visit http://support.microsoft.com/kb/2468871.</description>
+      </application>
+      <application>
+        <name>{3C3901C5-3455-3E0A-A214-0B093A5070A6}.KB2518870</name>
+        <display_name>Security Update for Microsoft .NET Framework 4 Client Profile (KB2518870)</display_name>
+        <version>1</version>
+        <publisher>Microsoft Corporation</publisher>
+        <url>http://support.microsoft.com</url>
+        <description>This security update is for Microsoft .NET Framework 4 Client Profile.&#13;
+If you later install a more recent service pack, this security update will be uninstalled automatically.&#13;
+For more information, visit http://support.microsoft.com/kb/2518870.</description>
+      </application>
+      <application>
+        <name>{3C3901C5-3455-3E0A-A214-0B093A5070A6}.KB2533523</name>
+        <display_name>Update for Microsoft .NET Framework 4 Client Profile (KB2533523)</display_name>
+        <version>1</version>
+        <publisher>Microsoft Corporation</publisher>
+        <url>http://support.microsoft.com</url>
+        <description>This update is for Microsoft .NET Framework 4 Client Profile.&#13;
+If you later install a more recent service pack, this update will be uninstalled automatically.&#13;
+For more information, visit http://support.microsoft.com/kb/2533523.</description>
+      </application>
+      <application>
+        <name>{3C3901C5-3455-3E0A-A214-0B093A5070A6}.KB2539636</name>
+        <display_name>Security Update for Microsoft .NET Framework 4 Client Profile (KB2539636)</display_name>
+        <version>1</version>
+        <publisher>Microsoft Corporation</publisher>
+        <url>http://support.microsoft.com</url>
+        <description>This security update is for Microsoft .NET Framework 4 Client Profile.&#13;
+If you later install a more recent service pack, this security update will be uninstalled automatically.&#13;
+For more information, visit http://support.microsoft.com/kb/2539636.</description>
+      </application>
+    </applications>
+    <icon>iVBORw0KGgoAAAANSUhEUgAAADYAAAA3CAIAAADIey4vAAAMo0lEQVRoge2YaViTVxbHMQlb\r
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+  </operatingsystem>
+</operatingsystems>