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863168467f
In libguestfs 1.20, you will be able to use 'add_drive' instead of 'add_drive_opts' (except in the C bindings). However until libguestfs 1.20 is the minimum stable version people will still be using old versions where you have to use 'add_drive_opts'. This makes the examples confusing. Therefore continue to use 'add_drive_opts' in the examples for now.
66 lines
1.7 KiB
Ruby
66 lines
1.7 KiB
Ruby
# Example showing how to create a disk image.
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require 'guestfs'
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output = "disk.img"
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g = Guestfs::Guestfs.new()
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# Create a raw-format sparse disk image, 512 MB in size.
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File.open(output, "w") {
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|f| f.truncate(512 * 1024 * 1024)
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}
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# Set the trace flag so that we can see each libguestfs call.
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g.set_trace(1)
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# Attach the disk image to libguestfs.
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g.add_drive_opts(output, :format => "raw")
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# Run the libguestfs back-end.
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g.launch();
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# Get the list of devices. Because we only added one drive
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# above, we expect that this list should contain a single
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# element.
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devices = g.list_devices()
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if devices.length != 1 then
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raise "error: expected a single device from list-devices"
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end
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# Partition the disk as one single MBR partition.
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g.part_disk(devices[0], "mbr")
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# Get the list of partitions. We expect a single element, which
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# is the partition we have just created.
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partitions = g.list_partitions()
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if partitions.length != 1 then
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raise "error: expected a single partition from list-partitions"
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end
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# Create a filesystem on the partition.
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g.mkfs("ext4", partitions[0])
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# Now mount the filesystem so that we can add files.
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g.mount_options("", partitions[0], "/")
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# Create some files and directories.
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g.touch("/empty")
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message = "Hello, world\n"
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g.write("/hello", message)
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g.mkdir("/foo")
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# This one uploads the local file /etc/resolv.conf into
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# the disk image.
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g.upload("/etc/resolv.conf", "/foo/resolv.conf")
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# Because we wrote to the disk and we want to detect write
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# errors, call g.shutdown. You don't need to do this:
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# g.close will do it implicitly.
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g.shutdown()
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# Note also that handles are automatically closed if they are
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# reaped by the garbage collector. You only need to call close
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# if you want to close the handle right away.
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g.close()
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