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# Example showing how to create a disk image.
require 'guestfs'
output = "disk.img"
g = Guestfs::Guestfs.new()
# Create a raw-format sparse disk image, 512 MB in size.
File.open(output, "w") {
|f| f.truncate(512 * 1024 * 1024)
}
# Set the trace flag so that we can see each libguestfs call.
g.set_trace(1)
# Set the autosync flag so that the disk will be synchronized
# automatically when the libguestfs handle is closed.
g.set_autosync(1)
# Attach the disk image to libguestfs.
g.add_drive_opts(output, :format => "raw")
# 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.
devices = g.list_devices()
if devices.length != 1 then
raise "error: expected a single device from list-devices"
end
# 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.
partitions = g.list_partitions()
if partitions.length != 1 then
raise "error: expected a single partition from list-partitions"
end
# 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")
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 'autosync' was set (above) we can just close the handle
# and the disk contents will be synchronized. You can also do
# this manually by calling g#umount_all and g#sync.
g.close()
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