counter-reset: chapter;
}
- body p {
+ body > p, body > img, body > pre, body > table {
margin-left: 2em;
}
}
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>
<table width="100%">
<tr><td valign="top">
-<pre style="font-size: 80%;">
+<pre>
("<b>vfs_type</b>",
(RString "fstype",
[Device "device"], []),
</td>
<td valign="top">
-<pre style="font-size: 80%;">
+<pre>
char *
<b>do_vfs_type</b> (const char *device)
{
<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 <<EOF</b>
<font style="color: green;">mkdir /etc
<h2>Inspection</h2>
+<pre>
+$ <b>virt-inspector -c qemu:///system -d Win7x32</b>
+
+<font style="color: #888;"><?xml version="1.0"?></font>
+<font style="color: #888;"><operatingsystems></font>
+ <font style="color: #888;"><operatingsystem></font>
+ <font style="color: #888;"><root></font>/dev/sda2<font style="color: #888;"></root></font>
+ <font style="color: #888;"><name></font>windows<font style="color: #888;"></name></font>
+ <font style="color: #888;"><arch></font>i386<font style="color: #888;"></arch></font>
+ <font style="color: #888;"><distro></font>windows<font style="color: #888;"></distro></font>
+ <font style="color: #888;"><product_name></font>Windows 7 Enterprise<font style="color: #888;"></product_name></font>
+ <font style="color: #888;"><product_variant></font>Client<font style="color: #888;"></product_variant></font>
+ <font style="color: #888;"><major_version></font>6<font style="color: #888;"></major_version></font>
+ <font style="color: #888;"><minor_version></font>1<font style="color: #888;"></minor_version></font>
+ <font style="color: #888;"><windows_systemroot></font>/Windows<font style="color: #888;"></windows_systemroot></font>
+ <font style="color: #888;"><windows_current_control_set></font>ControlSet001<font style="color: #888;"></windows_current_control_set></font>
+ <font style="color: #888;"><hostname></font>win7x32<font style="color: #888;"></hostname></font>
+<i>... etc ...</i>
+</pre>
+<p class="sourcelnk"><a href="win7.xml">full XML ...</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 source ...</a></p>
+
----------------------------------------------------------------------
+[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]
+
--- /dev/null
+<?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.
+If you later install a more recent service pack, this update will be uninstalled automatically.
+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.
+If you later install a more recent service pack, this security update will be uninstalled automatically.
+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.
+If you later install a more recent service pack, this update will be uninstalled automatically.
+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.
+If you later install a more recent service pack, this security update will be uninstalled automatically.
+For more information, visit http://support.microsoft.com/kb/2539636.</description>
+ </application>
+ </applications>
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+ </operatingsystem>
+</operatingsystems>