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255882a3f6
'del g' is a trap for the unwary. If the handle has any other references, it does nothing (in fact, it can be actively dangerous if the user was expecting the appliance to go away). In non-CPython it can be delayed arbitrarily long. Using 'g.close()' on the other hand is always safe.
62 lines
1.6 KiB
Python
62 lines
1.6 KiB
Python
# Example showing how to create a disk image.
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import os
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import guestfs
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output = "disk.img"
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g = guestfs.GuestFS ()
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# Create a raw-format sparse disk image, 512 MB in size.
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f = open (output, "w")
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f.truncate (512 * 1024 * 1024)
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f.close ()
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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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# Set the autosync flag so that the disk will be synchronized
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# automatically when the libguestfs handle is closed.
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g.set_autosync (1)
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# Attach the disk image to libguestfs.
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g.add_drive_opts (output, format = "raw", readonly = 0)
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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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assert (len (devices) == 1)
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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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assert (len (partitions) == 1)
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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 'autosync' was set (above) we can just close the handle
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# and the disk contents will be synchronized. You can also do
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# this manually by calling g.umount_all and g.sync.
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g.close ()
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