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#!/usr/bin/env escript
%%! -smp enable -sname inspect_vm debug verbose
% Example showing how to inspect a virtual machine disk.
main([Disk]) ->
{ok, G} = guestfs:create(),
% Attach the disk image read-only to libguestfs.
ok = guestfs:add_drive_opts(G, Disk, [{readonly, true}]),
% Run the libguestfs back-end.
ok = guestfs:launch(G),
% Ask libguestfs to inspect for operating systems.
case guestfs:inspect_os(G) of
[] ->
io:fwrite("inspect_vm: no operating systems found~n"),
exit(no_operating_system);
Roots ->
list_os(G, Roots)
end.
list_os(_, []) ->
ok;
list_os(G, [Root|Roots]) ->
io:fwrite("Root device: ~s~n", [Root]),
% Print basic information about the operating system.
Product_name = guestfs:inspect_get_product_name(G, Root),
io:fwrite(" Product name: ~s~n", [Product_name]),
Major = guestfs:inspect_get_major_version(G, Root),
Minor = guestfs:inspect_get_minor_version(G, Root),
io:fwrite(" Version: ~w.~w~n", [Major, Minor]),
Type = guestfs:inspect_get_type(G, Root),
io:fwrite(" Type: ~s~n", [Type]),
Distro = guestfs:inspect_get_distro(G, Root),
io:fwrite(" Distro: ~s~n", [Distro]),
% Mount up the disks, like guestfish -i.
Mps = sort_mps(guestfs:inspect_get_mountpoints(G, Root)),
mount_mps(G, Mps),
% If /etc/issue.net file exists, print up to 3 lines. *)
Filename = "/etc/issue.net",
Is_file = guestfs:is_file(G, Filename),
if Is_file ->
io:fwrite("--- ~s ---~n", [Filename]),
Lines = guestfs:head_n(G, 3, Filename),
write_lines(Lines);
true -> ok
end,
% Unmount everything.
ok = guestfs:umount_all(G),
list_os(G, Roots).
% Sort keys by length, shortest first, so that we end up
% mounting the filesystems in the correct order.
sort_mps(Mps) ->
Cmp = fun ({A,_}, {B,_}) ->
length(A) =< length(B) end,
lists:sort(Cmp, Mps).
mount_mps(_, []) ->
ok;
mount_mps(G, [{Mp, Dev}|Mps]) ->
case guestfs:mount_ro(G, Dev, Mp) of
ok -> ok;
{ error, Msg, _ } ->
io:fwrite("~s (ignored)~n", [Msg])
end,
mount_mps(G, Mps).
write_lines([]) ->
ok;
write_lines([Line|Lines]) ->
io:fwrite("~s~n", [Line]),
write_lines(Lines).
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