1 =head2 add-cdrom | cdrom
5 This function adds a virtual CD-ROM disk image to the guest.
7 This is equivalent to the qemu parameter C<-cdrom filename>.
13 This function adds a virtual machine disk image C<filename> to the
14 guest. The first time you call this function, the disk appears as IDE
15 disk 0 (C</dev/sda>) in the guest, the second time as C</dev/sdb>, and
18 You don't necessarily need to be root when using libguestfs. However
19 you obviously do need sufficient permissions to access the filename
20 for whatever operations you want to perform (ie. read access if you
21 just want to read the image or write access if you want to modify the
24 This is equivalent to the qemu parameter C<-drive file=filename>.
30 Close the current Augeas handle and free up any resources
31 used by it. After calling this, you have to call
32 C<aug_init> again before you can use any other
37 aug-defnode name expr val
39 Defines a variable C<name> whose value is the result of
42 If C<expr> evaluates to an empty nodeset, a node is created,
43 equivalent to calling C<aug_set> C<expr>, C<value>.
44 C<name> will be the nodeset containing that single node.
46 On success this returns a pair containing the
47 number of nodes in the nodeset, and a boolean flag
48 if a node was created.
54 Defines an Augeas variable C<name> whose value is the result
55 of evaluating C<expr>. If C<expr> is NULL, then C<name> is
58 On success this returns the number of nodes in C<expr>, or
59 C<0> if C<expr> evaluates to something which is not a nodeset.
65 Look up the value associated with C<path>. If C<path>
66 matches exactly one node, the C<value> is returned.
72 Create a new Augeas handle for editing configuration files.
73 If there was any previous Augeas handle associated with this
74 guestfs session, then it is closed.
76 You must call this before using any other C<aug_*>
79 C<root> is the filesystem root. C<root> must not be NULL,
82 The flags are the same as the flags defined in
83 E<lt>augeas.hE<gt>, the logical I<or> of the following
88 =item C<AUG_SAVE_BACKUP> = 1
90 Keep the original file with a C<.augsave> extension.
92 =item C<AUG_SAVE_NEWFILE> = 2
94 Save changes into a file with extension C<.augnew>, and
95 do not overwrite original. Overrides C<AUG_SAVE_BACKUP>.
97 =item C<AUG_TYPE_CHECK> = 4
99 Typecheck lenses (can be expensive).
101 =item C<AUG_NO_STDINC> = 8
103 Do not use standard load path for modules.
105 =item C<AUG_SAVE_NOOP> = 16
107 Make save a no-op, just record what would have been changed.
109 =item C<AUG_NO_LOAD> = 32
111 Do not load the tree in C<aug_init>.
115 To close the handle, you can call C<aug_close>.
117 To find out more about Augeas, see L<http://augeas.net/>.
121 aug-insert path label true|false
123 Create a new sibling C<label> for C<path>, inserting it into
124 the tree before or after C<path> (depending on the boolean
127 C<path> must match exactly one existing node in the tree, and
128 C<label> must be a label, ie. not contain C</>, C<*> or end
129 with a bracketed index C<[N]>.
135 Load files into the tree.
137 See C<aug_load> in the Augeas documentation for the full gory
144 This is just a shortcut for listing C<aug_match>
145 C<path/*> and sorting the resulting nodes into alphabetical order.
151 Returns a list of paths which match the path expression C<path>.
152 The returned paths are sufficiently qualified so that they match
153 exactly one node in the current tree.
159 Move the node C<src> to C<dest>. C<src> must match exactly
160 one node. C<dest> is overwritten if it exists.
166 Remove C<path> and all of its children.
168 On success this returns the number of entries which were removed.
174 This writes all pending changes to disk.
176 The flags which were passed to C<aug_init> affect exactly
183 Set the value associated with C<path> to C<value>.
185 =head2 blockdev-flushbufs
187 blockdev-flushbufs device
189 This tells the kernel to flush internal buffers associated
192 This uses the L<blockdev(8)> command.
194 =head2 blockdev-getbsz
196 blockdev-getbsz device
198 This returns the block size of a device.
200 (Note this is different from both I<size in blocks> and
201 I<filesystem block size>).
203 This uses the L<blockdev(8)> command.
205 =head2 blockdev-getro
207 blockdev-getro device
209 Returns a boolean indicating if the block device is read-only
210 (true if read-only, false if not).
212 This uses the L<blockdev(8)> command.
214 =head2 blockdev-getsize64
216 blockdev-getsize64 device
218 This returns the size of the device in bytes.
220 See also C<blockdev_getsz>.
222 This uses the L<blockdev(8)> command.
224 =head2 blockdev-getss
226 blockdev-getss device
228 This returns the size of sectors on a block device.
229 Usually 512, but can be larger for modern devices.
231 (Note, this is not the size in sectors, use C<blockdev_getsz>
234 This uses the L<blockdev(8)> command.
236 =head2 blockdev-getsz
238 blockdev-getsz device
240 This returns the size of the device in units of 512-byte sectors
241 (even if the sectorsize isn't 512 bytes ... weird).
243 See also C<blockdev_getss> for the real sector size of
244 the device, and C<blockdev_getsize64> for the more
245 useful I<size in bytes>.
247 This uses the L<blockdev(8)> command.
249 =head2 blockdev-rereadpt
251 blockdev-rereadpt device
253 Reread the partition table on C<device>.
255 This uses the L<blockdev(8)> command.
257 =head2 blockdev-setbsz
259 blockdev-setbsz device blocksize
261 This sets the block size of a device.
263 (Note this is different from both I<size in blocks> and
264 I<filesystem block size>).
266 This uses the L<blockdev(8)> command.
268 =head2 blockdev-setro
270 blockdev-setro device
272 Sets the block device named C<device> to read-only.
274 This uses the L<blockdev(8)> command.
276 =head2 blockdev-setrw
278 blockdev-setrw device
280 Sets the block device named C<device> to read-write.
282 This uses the L<blockdev(8)> command.
288 Return the contents of the file named C<path>.
290 Note that this function cannot correctly handle binary files
291 (specifically, files containing C<\0> character which is treated
292 as end of string). For those you need to use the C<read_file>
293 function which has a more complex interface.
295 Because of the message protocol, there is a transfer limit
296 of somewhere between 2MB and 4MB. To transfer large files you should use
303 Change the mode (permissions) of C<path> to C<mode>. Only
304 numeric modes are supported.
308 chown owner group path
310 Change the file owner to C<owner> and group to C<group>.
312 Only numeric uid and gid are supported. If you want to use
313 names, you will need to locate and parse the password file
314 yourself (Augeas support makes this relatively easy).
318 command arguments,...
320 This call runs a command from the guest filesystem. The
321 filesystem must be mounted, and must contain a compatible
322 operating system (ie. something Linux, with the same
323 or compatible processor architecture).
325 The single parameter is an argv-style list of arguments.
326 The first element is the name of the program to run.
327 Subsequent elements are parameters. The list must be
328 non-empty (ie. must contain a program name).
330 The C<$PATH> environment variable will contain at least
331 C</usr/bin> and C</bin>. If you require a program from
332 another location, you should provide the full path in the
335 Shared libraries and data files required by the program
336 must be available on filesystems which are mounted in the
337 correct places. It is the caller's responsibility to ensure
338 all filesystems that are needed are mounted at the right
343 command-lines arguments,...
345 This is the same as C<command>, but splits the
346 result into a list of lines.
350 config qemuparam qemuvalue
352 This can be used to add arbitrary qemu command line parameters
353 of the form C<-param value>. Actually it's not quite arbitrary - we
354 prevent you from setting some parameters which would interfere with
355 parameters that we use.
357 The first character of C<param> string must be a C<-> (dash).
359 C<value> can be NULL.
365 This returns C<true> if and only if there is a file, directory
366 (or anything) with the given C<path> name.
368 See also C<is_file>, C<is_dir>, C<stat>.
374 This call uses the standard L<file(1)> command to determine
375 the type or contents of the file. This also works on devices,
376 for example to find out whether a partition contains a filesystem.
378 The exact command which runs is C<file -bsL path>. Note in
379 particular that the filename is not prepended to the output
386 Get the autosync flag.
392 Return the current search path.
394 This is always non-NULL. If it wasn't set already, then this will
395 return the default path.
401 This returns the verbose messages flag.
407 This returns C<true> if and only if there is a directory
408 with the given C<path> name. Note that it returns false for
409 other objects like files.
417 This returns C<true> if and only if there is a file
418 with the given C<path> name. Note that it returns false for
419 other objects like directories.
423 =head2 kill-subprocess
427 This kills the qemu subprocess. You should never need to call this.
433 Internally libguestfs is implemented by running a virtual machine
436 You should call this after configuring the handle
437 (eg. adding drives) but before performing any actions.
443 List all the block devices.
445 The full block device names are returned, eg. C</dev/sda>
447 =head2 list-partitions
451 List all the partitions detected on all block devices.
453 The full partition device names are returned, eg. C</dev/sda1>
455 This does not return logical volumes. For that you will need to
462 List the files in C<directory> (relative to the root directory,
463 there is no cwd) in the format of 'ls -la'.
465 This command is mostly useful for interactive sessions. It
466 is I<not> intended that you try to parse the output string.
472 List the files in C<directory> (relative to the root directory,
473 there is no cwd). The '.' and '..' entries are not returned, but
474 hidden files are shown.
476 This command is mostly useful for interactive sessions. Programs
477 should probably use C<readdir> instead.
483 Returns file information for the given C<path>.
485 This is the same as C<stat> except that if C<path>
486 is a symbolic link, then the link is stat-ed, not the file it
489 This is the same as the C<lstat(2)> system call.
493 lvcreate logvol volgroup mbytes
495 This creates an LVM volume group called C<logvol>
496 on the volume group C<volgroup>, with C<size> megabytes.
498 =head2 lvm-remove-all
502 This command removes all LVM logical volumes, volume groups
503 and physical volumes.
505 B<This command is dangerous. Without careful use you
506 can easily destroy all your data>.
512 List all the logical volumes detected. This is the equivalent
513 of the L<lvs(8)> command.
515 This returns a list of the logical volume device names
516 (eg. C</dev/VolGroup00/LogVol00>).
518 See also C<lvs_full>.
524 List all the logical volumes detected. This is the equivalent
525 of the L<lvs(8)> command. The "full" version includes all fields.
531 Create a directory named C<path>.
537 Create a directory named C<path>, creating any parent directories
538 as necessary. This is like the C<mkdir -p> shell command.
544 This creates a filesystem on C<device> (usually a partition
545 of LVM logical volume). The filesystem type is C<fstype>, for
550 mount device mountpoint
552 Mount a guest disk at a position in the filesystem. Block devices
553 are named C</dev/sda>, C</dev/sdb> and so on, as they were added to
554 the guest. If those block devices contain partitions, they will have
555 the usual names (eg. C</dev/sda1>). Also LVM C</dev/VG/LV>-style
558 The rules are the same as for L<mount(2)>: A filesystem must
559 first be mounted on C</> before others can be mounted. Other
560 filesystems can only be mounted on directories which already
563 The mounted filesystem is writable, if we have sufficient permissions
564 on the underlying device.
566 The filesystem options C<sync> and C<noatime> are set with this
567 call, in order to improve reliability.
573 This returns the list of currently mounted filesystems. It returns
574 the list of devices (eg. C</dev/sda1>, C</dev/VG/LV>).
576 Some internal mounts are not shown.
582 This creates an LVM physical volume on the named C<device>,
583 where C<device> should usually be a partition name such
590 List all the physical volumes detected. This is the equivalent
591 of the L<pvs(8)> command.
593 This returns a list of just the device names that contain
594 PVs (eg. C</dev/sda2>).
596 See also C<pvs_full>.
602 List all the physical volumes detected. This is the equivalent
603 of the L<pvs(8)> command. The "full" version includes all fields.
609 Return the contents of the file named C<path>.
611 The file contents are returned as a list of lines. Trailing
612 C<LF> and C<CRLF> character sequences are I<not> returned.
614 Note that this function cannot correctly handle binary files
615 (specifically, files containing C<\0> character which is treated
616 as end of line). For those you need to use the C<read_file>
617 function which has a more complex interface.
623 Remove the single file C<path>.
629 Remove the file or directory C<path>, recursively removing the
630 contents if its a directory. This is like the C<rm -rf> shell
637 Remove the single directory C<path>.
639 =head2 set-autosync | autosync
641 set-autosync true|false
643 If C<autosync> is true, this enables autosync. Libguestfs will make a
644 best effort attempt to run C<sync> when the handle is closed
645 (also if the program exits without closing handles).
647 =head2 set-path | path
651 Set the path that libguestfs searches for kernel and initrd.img.
653 The default is C<$libdir/guestfs> unless overridden by setting
654 C<LIBGUESTFS_PATH> environment variable.
656 The string C<path> is stashed in the libguestfs handle, so the caller
657 must make sure it remains valid for the lifetime of the handle.
659 Setting C<path> to C<NULL> restores the default path.
661 =head2 set-verbose | verbose
663 set-verbose true|false
665 If C<verbose> is true, this turns on verbose messages (to C<stderr>).
667 Verbose messages are disabled unless the environment variable
668 C<LIBGUESTFS_DEBUG> is defined and set to C<1>.
672 sfdisk device cyls heads sectors lines,...
674 This is a direct interface to the L<sfdisk(8)> program for creating
675 partitions on block devices.
677 C<device> should be a block device, for example C</dev/sda>.
679 C<cyls>, C<heads> and C<sectors> are the number of cylinders, heads
680 and sectors on the device, which are passed directly to sfdisk as
681 the I<-C>, I<-H> and I<-S> parameters. If you pass C<0> for any
682 of these, then the corresponding parameter is omitted. Usually for
683 'large' disks, you can just pass C<0> for these, but for small
684 (floppy-sized) disks, sfdisk (or rather, the kernel) cannot work
685 out the right geometry and you will need to tell it.
687 C<lines> is a list of lines that we feed to C<sfdisk>. For more
688 information refer to the L<sfdisk(8)> manpage.
690 To create a single partition occupying the whole disk, you would
691 pass C<lines> as a single element list, when the single element being
692 the string C<,> (comma).
694 B<This command is dangerous. Without careful use you
695 can easily destroy all your data>.
701 Returns file information for the given C<path>.
703 This is the same as the C<stat(2)> system call.
709 Returns file system statistics for any mounted file system.
710 C<path> should be a file or directory in the mounted file system
711 (typically it is the mount point itself, but it doesn't need to be).
713 This is the same as the C<statvfs(2)> system call.
719 This syncs the disk, so that any writes are flushed through to the
720 underlying disk image.
722 You should always call this if you have modified a disk image, before
729 Touch acts like the L<touch(1)> command. It can be used to
730 update the timestamps on a file, or, if the file does not exist,
731 to create a new zero-length file.
737 This returns the contents of the ext2 or ext3 filesystem superblock
740 It is the same as running C<tune2fs -l device>. See L<tune2fs(8)>
741 manpage for more details. The list of fields returned isn't
742 clearly defined, and depends on both the version of C<tune2fs>
743 that libguestfs was built against, and the filesystem itself.
745 =head2 umount | unmount
749 This unmounts the given filesystem. The filesystem may be
750 specified either by its mountpoint (path) or the device which
751 contains the filesystem.
753 =head2 umount-all | unmount-all
757 This unmounts all mounted filesystems.
759 Some internal mounts are not unmounted by this call.
763 vgcreate volgroup physvols,...
765 This creates an LVM volume group called C<volgroup>
766 from the non-empty list of physical volumes C<physvols>.
772 List all the volumes groups detected. This is the equivalent
773 of the L<vgs(8)> command.
775 This returns a list of just the volume group names that were
776 detected (eg. C<VolGroup00>).
778 See also C<vgs_full>.
784 List all the volumes groups detected. This is the equivalent
785 of the L<vgs(8)> command. The "full" version includes all fields.
789 write-file path content size
791 This call creates a file called C<path>. The contents of the
792 file is the string C<content> (which can contain any 8 bit data),
795 As a special case, if C<size> is C<0>
796 then the length is calculated using C<strlen> (so in this case
797 the content cannot contain embedded ASCII NULs).
799 Because of the message protocol, there is a transfer limit
800 of somewhere between 2MB and 4MB. To transfer large files you should use