[Libguestfs] [PATCH] v2v: linux: improve archtecture detection from modules (RHBZ#1690574)

Try to look for a well known kernel module (so far only virtio, or kvm) to use for detecting the architecture of a kernel. This way, we can avoid picking 3rd party modules that cause troubles. --- v2v/linux_kernels.ml | 30 +++++++++++++++++++++++++++--- 1 file changed, 27 insertions(+), 3 deletions(-) diff --git a/v2v/linux_kernels.ml b/v2v/linux_kernels.ml index 3313aabc7..f1b9bdd97 100644 --- a/v2v/linux_kernels.ml +++ b/v2v/linux_kernels.ml @@ -185,11 +185,35 @@ let detect_kernels (g : G.guestfs) inspect family bootloader = assert (List.length modules > 0); (* Determine the kernel architecture by looking at the - * architecture of an arbitrary kernel module. + * architecture of a kernel module. + * + * To avoid architecture detection issues with 3rd party + * modules (RHBZ#1690574), try to pick one of the well + * known modules, if available. Otherwise, an arbitrary + * module is used. *) let arch = - let any_module = modpath ^ List.hd modules in - g#file_architecture any_module in + (* Well known kernel modules. *) + let candidates = [ "virtio"; "kvm" ] in + let all_candidates = List.flatten ( + List.map ( + fun f -> + [ "/" ^ f ^ ".o"; "/" ^ f ^ ".ko"; "/" ^ f ^ ".ko.xz" ] + ) candidates + ) in + let candidate = + try + List.find ( + fun m -> + List.exists (String.is_suffix m) all_candidates + ) modules + with Not_found -> + (* No known module found, pick an arbitrary one + * (the first). + *) + List.hd modules in + let candidate = modpath ^ candidate in + g#file_architecture candidate in (* Just return the module names, without path or extension. *) let modules = List.filter_map ( -- 2.20.1