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#!/usr/bin/perl -w
# Example showing how to create a disk image.
use strict;
use Sys::Guestfs;
my $output = "disk.img";
my $g = new Sys::Guestfs ();
# Create a raw-format sparse disk image, 512 MB in size.
open FILE, ">$output" or die "$output: $!";
truncate FILE, 512 * 1024 * 1024 or die "$output: truncate: $!";
close FILE or die "$output: $!";
# Set the trace flag so that we can see each libguestfs call.
$g->set_trace (1);
# Attach the disk image to libguestfs.
$g->add_drive_opts ($output, format => "raw", readonly => 0);
# Run the libguestfs back-end.
$g->launch ();
# Get the list of devices. Because we only added one drive
# above, we expect that this list should contain a single
# element.
my @devices = $g->list_devices ();
if (@devices != 1) {
die "error: expected a single device from list-devices";
}
# Partition the disk as one single MBR partition.
$g->part_disk ($devices[0], "mbr");
# Get the list of partitions. We expect a single element, which
# is the partition we have just created.
my @partitions = $g->list_partitions ();
if (@partitions != 1) {
die "error: expected a single partition from list-partitions";
}
# Create a filesystem on the partition.
$g->mkfs ("ext4", $partitions[0]);
# Now mount the filesystem so that we can add files.
$g->mount_options ("", $partitions[0], "/");
# Create some files and directories.
$g->touch ("/empty");
my $message = "Hello, world\n";
$g->write ("/hello", $message);
$g->mkdir ("/foo");
# This one uploads the local file /etc/resolv.conf into
# the disk image.
$g->upload ("/etc/resolv.conf", "/foo/resolv.conf");
# Because we wrote to the disk and we want to detect write
# errors, call $g->shutdown. You don't need to do this:
# $g->close will do it implicitly.
$g->shutdown ();
# Note also that handles are automatically closed if they are
# reaped by reference counting. You only need to call close
# if you want to close the handle right away.
$g->close ();
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