just want to read the image or write access if you want to modify the
image).
-This is equivalent to the qemu parameter C<-drive file=filename,cache=off>.
+This is equivalent to the qemu parameter
+C<-drive file=filename,cache=off,if=virtio>.
Note that this call checks for the existence of C<filename>. This
stops you from specifying other types of drive which are supported
changes to be committed, although qemu can support this.
This is equivalent to the qemu parameter
-C<-drive file=filename,snapshot=on>.
+C<-drive file=filename,snapshot=on,if=virtio>.
Note that this call checks for the existence of C<filename>. This
stops you from specifying other types of drive which are supported
This returns the ext2/3/4 filesystem UUID of the filesystem on
C<device>.
+=item $memsize = $h->get_memsize ();
+
+This gets the memory size in megabytes allocated to the
+qemu subprocess.
+
+If C<$h-E<gt>set_memsize> was not called
+on this handle, and if C<LIBGUESTFS_MEMSIZE> was not set,
+then this returns the compiled-in default value for memsize.
+
+For more information on the architecture of libguestfs,
+see L<guestfs(3)>.
+
=item $path = $h->get_path ();
Return the current search path.
See also: L<mkdtemp(3)>
+=item $h->mkfifo ($mode, $path);
+
+This call creates a FIFO (named pipe) called C<path> with
+mode C<mode>. It is just a convenient wrapper around
+C<$h-E<gt>mknod>.
+
=item $h->mkfs ($fstype, $device);
This creates a filesystem on C<device> (usually a partition
or LVM logical volume). The filesystem type is C<fstype>, for
example C<ext3>.
+=item $h->mknod ($mode, $devmajor, $devminor, $path);
+
+This call creates block or character special devices, or
+named pipes (FIFOs).
+
+The C<mode> parameter should be the mode, using the standard
+constants. C<devmajor> and C<devminor> are the
+device major and minor numbers, only used when creating block
+and character special devices.
+
+=item $h->mknod_b ($mode, $devmajor, $devminor, $path);
+
+This call creates a block device node called C<path> with
+mode C<mode> and device major/minor C<devmajor> and C<devminor>.
+It is just a convenient wrapper around C<$h-E<gt>mknod>.
+
+=item $h->mknod_c ($mode, $devmajor, $devminor, $path);
+
+This call creates a char device node called C<path> with
+mode C<mode> and device major/minor C<devmajor> and C<devminor>.
+It is just a convenient wrapper around C<$h-E<gt>mknod>.
+
=item $h->mkswap ($device);
Create a swap partition on C<device>.
as end of line). For those you need to use the C<$h-E<gt>read_file>
function which has a more complex interface.
+=item @entries = $h->readdir ($dir);
+
+This returns the list of directory entries in directory C<dir>.
+
+All entries in the directory are returned, including C<.> and
+C<..>. The entries are I<not> sorted, but returned in the same
+order as the underlying filesystem.
+
+This function is primarily intended for use by programs. To
+get a simple list of names, use C<$h-E<gt>ls>. To get a printable
+directory for human consumption, use C<$h-E<gt>ll>.
+
=item $h->resize2fs ($device);
This resizes an ext2 or ext3 filesystem to match the size of
You can use either C<$h-E<gt>tune2fs_l> or C<$h-E<gt>get_e2uuid>
to return the existing UUID of a filesystem.
+=item $h->set_memsize ($memsize);
+
+This sets the memory size in megabytes allocated to the
+qemu subprocess. This only has any effect if called before
+C<$h-E<gt>launch>.
+
+You can also change this by setting the environment
+variable C<LIBGUESTFS_MEMSIZE> before the handle is
+created.
+
+For more information on the architecture of libguestfs,
+see L<guestfs(3)>.
+
=item $h->set_path ($path);
Set the path that libguestfs searches for kernel and initrd.img.
clearly defined, and depends on both the version of C<tune2fs>
that libguestfs was built against, and the filesystem itself.
+=item $oldmask = $h->umask ($mask);
+
+This function sets the mask used for creating new files and
+device nodes to C<mask & 0777>.
+
+Typical umask values would be C<022> which creates new files
+with permissions like "-rw-r--r--" or "-rwxr-xr-x", and
+C<002> which creates new files with permissions like
+"-rw-rw-r--" or "-rwxrwxr-x".
+
+The default umask is C<022>. This is important because it
+means that directories and device nodes will be created with
+C<0644> or C<0755> mode even if you specify C<0777>.
+
+See also L<umask(2)>, C<$h-E<gt>mknod>, C<$h-E<gt>mkdir>.
+
+This call returns the previous umask.
+
=item $h->umount ($pathordevice);
This unmounts the given filesystem. The filesystem may be
git.annexia.org / libguestfs.git / blobdiff