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From 54c42d18d82ae4c5c0562600b47a7710a583ea07 Mon Sep 17 00:00:00 2001
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From: Pavel Butsykin <pbutsykin@virtuozzo.com>
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Date: Tue, 2 May 2017 15:35:06 +0300
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Subject: [PATCH] v2v: bootloaders: search grub config for all distributions
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This patch improves the search of grub config on EFI partition. This
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means that the config will be found not only for rhel but also for
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many other distributions. Tests were performed on the following
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distributions: centos, fedora, ubuntu, suse. In all cases, the config
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path was /boot/efi/EFI/*distname*/grub.cfg
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The main purpose of the patch is to improve support for converting of
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vm with UEFI for most distributions. Unfortunately this patch does not
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solve the problem for all distributions, for example Debian does not
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store grub config on the EFI partition, therefore for such
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distributions another solution is necessary.
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Signed-off-by: Pavel Butsykin <pbutsykin@virtuozzo.com>
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(cherry picked from commit a76e9040b20f97eb5c9accbefcbf55999554dc48)
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---
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v2v/linux_bootloaders.ml | 76 ++++++++++++++++++++++++++++++------------------
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1 file changed, 48 insertions(+), 28 deletions(-)
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diff --git a/v2v/linux_bootloaders.ml b/v2v/linux_bootloaders.ml
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index c3fd09ca8..25dab02fe 100644
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--- a/v2v/linux_bootloaders.ml
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+++ b/v2v/linux_bootloaders.ml
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@@ -49,6 +49,13 @@ let remove_hd_prefix path =
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(* Grub1 (AKA grub-legacy) representation. *)
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class bootloader_grub1 (g : G.guestfs) inspect grub_config =
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+ let () =
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+ (* Apply the "grub" lens if it is not handling the file
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+ * already -- Augeas < 1.7.0 will error out otherwise.
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+ *)
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+ if g#aug_ls ("/files" ^ grub_config) = [||] then
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+ g#aug_transform "grub" grub_config in
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+
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(* Grub prefix? Usually "/boot". *)
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let grub_prefix =
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let mounts = g#inspect_get_mountpoints inspect.i_root in
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@@ -345,33 +352,46 @@ object (self)
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end
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let detect_bootloader (g : G.guestfs) inspect =
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- let config_file, typ =
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- let locations = [
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- "/boot/grub2/grub.cfg", Grub2;
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- "/boot/grub/grub.cfg", Grub2;
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- "/boot/grub/menu.lst", Grub1;
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- "/boot/grub/grub.conf", Grub1;
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- ] in
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- let locations =
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- match inspect.i_firmware with
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- | I_UEFI _ ->
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- [
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- "/boot/efi/EFI/redhat/grub.cfg", Grub2;
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- "/boot/efi/EFI/redhat/grub.conf", Grub1;
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- ] @ locations
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- | I_BIOS -> locations in
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- try
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- List.find (
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- fun (config_file, _) -> g#is_file ~followsymlinks:true config_file
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- ) locations
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- with
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- Not_found ->
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- error (f_"no bootloader detected") in
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+ (* Where to start searching for bootloaders. *)
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+ let mp =
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+ match inspect.i_firmware with
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+ | I_BIOS -> "/boot"
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+ | I_UEFI _ -> "/boot/efi/EFI" in
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- match typ with
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- | Grub1 ->
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- if config_file = "/boot/efi/EFI/redhat/grub.conf" then
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- g#aug_transform "grub" "/boot/efi/EFI/redhat/grub.conf";
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+ (* Find all paths below the mountpoint, then filter them to find
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+ * the grub config file.
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+ *)
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+ let paths =
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+ try List.map ((^) mp) (Array.to_list (g#find mp))
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+ with G.Error msg ->
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+ error (f_"could not find bootloader mount point (%s): %s") mp msg in
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- new bootloader_grub1 g inspect config_file
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- | Grub2 -> new bootloader_grub2 g config_file
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+ (* We can determine if the bootloader config file is grub 1 or
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+ * grub 2 just by looking at the filename.
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+ *)
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+ let bootloader_type_of_filename path =
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+ match last_part_of path '/' with
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+ | Some "grub.cfg" -> Some Grub2
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+ | Some ("grub.conf" | "menu.lst") -> Some Grub1
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+ | Some _
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+ | None -> None
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+ in
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+
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+ let grub_config, typ =
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+ let rec loop = function
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+ | [] -> error (f_"no bootloader detected")
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+ | path :: paths ->
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+ match bootloader_type_of_filename path with
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+ | None -> loop paths
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+ | Some typ ->
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+ if not (g#is_file ~followsymlinks:true path) then loop paths
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+ else path, typ
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+ in
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+ loop paths in
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+
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+ let bl =
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+ (match typ with
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+ | Grub1 -> new bootloader_grub1 g inspect grub_config
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+ | Grub2 -> new bootloader_grub2 g grub_config) in
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+ debug "detected bootloader %s at %s" bl#name grub_config;
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+ bl
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--
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2.14.3
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