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-- Example showing how to inspect a virtual machine disk.
require "guestfs"
if table.getn (arg) == 1 then
disk = arg[1]
else
error ("usage: inspect_vm disk.img")
end
g = Guestfs.create ()
-- Attach the disk image read-only to libguestfs.
g:add_drive (disk, { -- format:"raw"
readonly = true })
-- Run the libguestfs back-end.
g:launch ()
-- Ask libguestfs to inspect for operating systems.
roots = g:inspect_os ()
if table.getn (roots) == 0 then
error ("inspect_vm: no operating systems found")
end
for _, root in ipairs (roots) do
print ("Root device: ", root)
-- Print basic information about the operating system.
print (" Product name: ", g:inspect_get_product_name (root))
print (" Version: ",
g:inspect_get_major_version (root),
g:inspect_get_minor_version (root))
print (" Type: ", g:inspect_get_type (root))
print (" Distro: ", g:inspect_get_distro (root))
-- Mount up the disks, like guestfish -i.
--
-- Sort keys by length, shortest first, so that we end up
-- mounting the filesystems in the correct order.
mps = g:inspect_get_mountpoints (root)
table.sort (mps,
function (a, b)
return string.len (a) < string.len (b)
end)
for mp,dev in pairs (mps) do
pcall (function () g:mount_ro (dev, mp) end)
end
-- If /etc/issue.net file exists, print up to 3 lines.
filename = "/etc/issue.net"
if g:is_file (filename) then
print ("--- ", filename, " ---")
lines = g:head_n (3, filename)
for _, line in ipairs (lines) do
print (line)
end
end
-- Unmount everything.
g:umount_all ()
end
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