[Libguestfs] [PATCH v2 5/7] v2v: linux: check also kernel config for modules
When checking whether a kernel supports virtio or it is Xen-based, it is
assumed that the feature has the kernel module for it; this will fail if
the feature is built-in in the kernel, misrepresenting it.
The solution is to check the kernel configuration (/boot/config-$kver)
whether the feature is built-in, in case there is no module available.
This fixes the virtio detection on Ubuntu kernels, where virtio is
built in and not as module.
---
v2v/convert_linux.ml | 22 ++++++++++++++++++++--
1 file changed, 20 insertions(+), 2 deletions(-)
diff --git a/v2v/convert_linux.ml b/v2v/convert_linux.ml
index ce9a1e3..6f96073 100644
--- a/v2v/convert_linux.ml
+++ b/v2v/convert_linux.ml
@@ -95,6 +95,21 @@ let rec convert ~keep_serial_console (g : G.guestfs) inspect source
rcaps =
(* What kernel/kernel-like packages are installed on the current guest? *)
let installed_kernels : kernel_info list =
let rex_ko = Str.regexp ".*\\.k?o\\(\\.xz\\)?$" in
+ let check_config version feature =
+ let prefix = "^CONFIG_" ^ String.uppercase_ascii feature ^ "="
in
+ let lines = g#grep ~extended:true prefix ("/boot/config-" ^ version) in
+ let lines = Array.to_list lines in
+ match lines with
+ | [] -> false
+ | line :: _ ->
+ let kind = snd (String.split "=" line) in
+ (match kind with
+ | "m" (* Theoretically this should not be needed, since the module
+ * would be found. *)
+ | "y" -> true
+ | _ -> false
+ )
+ in
let rex_ko_extract = Str.regexp ".*/\\([^/]+\\)\\.k?o\\(\\.xz\\)?$" in
let rex_initrd = Str.regexp "^initr\\(d\\|amfs\\)-.*\\(\\.img\\)?$" in
filter_map (
@@ -193,8 +208,11 @@ let rec convert ~keep_serial_console (g : G.guestfs) inspect source
rcaps =
) modules in
assert (List.length modules > 0);
- let supports_virtio = List.mem "virtio_net" modules in
- let is_xen_kernel = List.mem "xennet" modules in
+ let kernel_supports what =
+ List.mem what modules || check_config version what in
+
+ let supports_virtio = kernel_supports "virtio_net" in
+ let is_xen_kernel = kernel_supports "xennet" in
(* If the package name is like "kernel-debug", then it's
* a debug kernel.
--
2.7.4