From 10afd834b5e1787cb2b22fce96de30baf37b5b2b Mon Sep 17 00:00:00 2001 From: Pino Toscano Date: Wed, 20 Mar 2019 12:32:02 +0100 Subject: [PATCH] v2v: linux: improve arch 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. (cherry picked from commit 363b5e0b4ecebe861a9aafe8bce5a8390b54571c) --- 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 889ec2f2a..30160f0da 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 (g#realpath 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 (g#realpath candidate) in (* Just return the module names, without path or extension. *) let modules = List.filter_map ( -- 2.26.2