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92759efbf5
When validating user input, print an error message and exit, instead of either asserting or raising a non-existing exception.
61 lines
1.8 KiB
Python
61 lines
1.8 KiB
Python
# Example showing how to inspect a virtual machine disk.
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import sys
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import guestfs
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if len(sys.argv) < 2:
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print("inspect_vm: missing disk image to inspect", file=sys.stderr)
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sys.exit(1)
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disk = sys.argv[1]
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# All new Python code should pass python_return_dict=True
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# to the constructor. It indicates that your program wants
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# to receive Python dicts for methods in the API that return
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# hashtables.
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g = guestfs.GuestFS(python_return_dict=True)
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# Attach the disk image read-only to libguestfs.
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g.add_drive_opts(disk, readonly=1)
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# Run the libguestfs back-end.
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g.launch()
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# Ask libguestfs to inspect for operating systems.
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roots = g.inspect_os()
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if len(roots) == 0:
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print("inspect_vm: no operating systems found", file=sys.stderr)
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sys.exit(1)
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for root in roots:
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print("Root device: %s" % root)
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# Print basic information about the operating system.
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print(" Product name: %s" % (g.inspect_get_product_name(root)))
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print(" Version: %d.%d" %
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(g.inspect_get_major_version(root),
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g.inspect_get_minor_version(root)))
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print(" Type: %s" % (g.inspect_get_type(root)))
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print(" Distro: %s" % (g.inspect_get_distro(root)))
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# Mount up the disks, like guestfish -i.
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#
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# Sort keys by length, shortest first, so that we end up
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# mounting the filesystems in the correct order.
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mps = g.inspect_get_mountpoints(root)
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for device, mp in sorted(mps.items(), key=lambda k: len(k[0])):
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try:
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g.mount_ro(mp, device)
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except RuntimeError as msg:
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print("%s (ignored)" % msg)
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# If /etc/issue.net file exists, print up to 3 lines.
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filename = "/etc/issue.net"
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if g.is_file(filename):
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print("--- %s ---" % filename)
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lines = g.head_n(3, filename)
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for line in lines:
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print(line)
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# Unmount everything.
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g.umount_all()
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