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convert_linux.ml
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convert_linux.ml
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(* virt-v2v
* Copyright (C) 2009-2020 Red Hat Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*)
(* Convert a Linux guest to run on KVM. *)
(* < mdbooth> It's all in there for a reason :/ *)
open Printf
open C_utils
open Std_utils
open Tools_utils
open Common_gettext.Gettext
open Utils
open Types
open Linux_kernels
module G = Guestfs
(* The conversion function. *)
let convert (g : G.guestfs) source inspect keep_serial_console _ =
(*----------------------------------------------------------------------*)
(* Inspect the guest first. We already did some basic inspection in
* the common v2v.ml code, but that has to deal with generic guests
* (anything common to Linux and Windows). Here we do more detailed
* inspection which can make the assumption that we are dealing with
* a Linux guest using RPM or Debian packages.
*)
(* Basic inspection data available as local variables. *)
assert (inspect.i_type = "linux");
let family =
match inspect.i_distro with
| "fedora"
| "rhel" | "centos" | "scientificlinux" | "redhat-based"
| "oraclelinux" -> `RHEL_family
| "altlinux" -> `ALT_family
| "sles" | "suse-based" | "opensuse" -> `SUSE_family
| "debian" | "ubuntu" | "linuxmint" | "kalilinux" -> `Debian_family
| _ -> assert false in
assert (inspect.i_package_format = "rpm" || inspect.i_package_format = "deb");
(* Fail early if i_apps is empty. Certain steps such as kernel
* detection won't work without this. If the list is empty it
* likely indicates that libguestfs inspection is broken for
* this guest. See for example RHBZ#1965147.
*)
if inspect.i_apps = [] then
error (f_"inspection of the package database failed for this Linux guest. Rerun virt-v2v with -v -x and see earlier errors. This is an internal error which probably means that this guest is not supported by libguestfs inspection. If the guest should work with virt-v2v (see virt-v2v docs) then a fix will be required in libguestfs.");
(* We use Augeas for inspection and conversion, so initialize it early.
* Calling debug_augeas_errors will display any //error nodes in
* debugging output if verbose (but otherwise it does nothing).
*)
g#aug_init "/" 1;
debug_augeas_errors g;
(* Clean RPM database. This must be done early to avoid RHBZ#1143866. *)
Array.iter g#rm_f (g#glob_expand "/var/lib/rpm/__db.00?");
(* Detect the installed bootloader. *)
let bootloader = Linux_bootloaders.detect_bootloader g inspect in
Linux.augeas_reload g;
(* Detect which kernels are installed and offered by the bootloader. *)
let bootloader_kernels =
Linux_kernels.detect_kernels g inspect family bootloader in
(*----------------------------------------------------------------------*)
(* Conversion step. *)
let rec do_convert () =
augeas_grub_configuration ();
unconfigure_xen ();
unconfigure_vbox ();
unconfigure_vmware ();
unconfigure_citrix ();
unconfigure_kudzu ();
unconfigure_prltools ();
install_linux_tools ();
let kernel = configure_kernel () in
if keep_serial_console then (
configure_console ();
bootloader#configure_console ();
) else (
remove_console ();
bootloader#remove_console ();
);
let acpi = supports_acpi () in
let block_type =
if kernel.ki_supports_virtio_blk then Virtio_blk else IDE in
let net_type =
if kernel.ki_supports_virtio_net then Virtio_net else E1000 in
configure_display_driver ();
remap_block_devices block_type;
configure_kernel_modules block_type net_type;
rebuild_initrd kernel;
SELinux_relabel.relabel g;
(* Pivot on the year 2007. Any Linux distro from earlier than
* 2007 should use i440fx, anything 2007 or newer should use q35.
* XXX Look up this information in libosinfo in future.
*)
let machine =
match inspect.i_arch, inspect.i_distro, inspect.i_major_version with
| ("i386"|"x86_64"), "fedora", _ -> Q35
| ("i386"|"x86_64"), ("rhel"|"centos"|"scientificlinux"|
"redhat-based"|"oraclelinux"), major ->
if major <= 4 then I440FX else Q35
| ("i386"|"x86_64"), ("sles"|"suse-based"|"opensuse"), major ->
if major < 10 then I440FX else Q35
| ("i386"|"x86_64"), ("debian"|"ubuntu"|"linuxmint"|
"kalilinux"), major ->
if major < 4 then I440FX else Q35
(* reasonable default for all modern Linux kernels *)
| ("i386"|"x86_64"), _, _ -> Q35
| _ -> Virt in
(* Return guest capabilities from the convert () function. *)
let guestcaps = {
gcaps_block_bus = block_type;
gcaps_net_bus = net_type;
gcaps_video = QXL;
gcaps_virtio_rng = kernel.ki_supports_virtio_rng;
gcaps_virtio_balloon = kernel.ki_supports_virtio_balloon;
gcaps_isa_pvpanic = kernel.ki_supports_isa_pvpanic;
gcaps_virtio_socket = kernel.ki_supports_virtio_socket;
gcaps_machine = machine;
gcaps_arch = Utils.kvm_arch inspect.i_arch;
gcaps_acpi = acpi;
} in
guestcaps
and augeas_grub_configuration () =
if bootloader#set_augeas_configuration () then
Linux.augeas_reload g
and unconfigure_xen () =
(* Remove kmod-xenpv-* (RHEL 3). *)
let xenmods =
List.filter_map (
fun { G.app2_name = name } ->
if name = "kmod-xenpv" || String.is_prefix name "kmod-xenpv-" then
Some name
else
None
) inspect.i_apps in
Linux.remove g inspect xenmods;
(* Undo related nastiness if kmod-xenpv was installed. *)
if xenmods <> [] then (
(* kmod-xenpv modules may have been manually copied to other kernels.
* Hunt them down and destroy them.
*)
let dirs = g#find "/lib/modules" in
let dirs = Array.to_list dirs in
let dirs = List.filter (fun s -> String.find s "/xenpv" >= 0) dirs in
let dirs = List.map ((^) "/lib/modules/") dirs in
let dirs = List.filter g#is_dir dirs in
(* Check it's not owned by an installed application. *)
let dirs = List.filter (
fun d -> not (Linux.is_file_owned g inspect d)
) dirs in
(* Remove any unowned xenpv directories. *)
List.iter g#rm_rf dirs;
(* rc.local may contain an insmod or modprobe of the xen-vbd driver,
* added by an installation script.
*)
(try
let lines = g#read_lines "/etc/rc.local" in
let lines = Array.to_list lines in
let rex = PCRE.compile "\\b(insmod|modprobe)\\b.*\\bxen-vbd" in
let lines = List.map (
fun s ->
if PCRE.matches rex s then
"#" ^ s
else
s
) lines in
let file = String.concat "\n" lines ^ "\n" in
g#write "/etc/rc.local" file
with
G.Error msg -> eprintf "%s: /etc/rc.local: %s (ignored)\n" prog msg
);
);
if family = `SUSE_family then (
(* Remove xen modules from INITRD_MODULES and DOMU_INITRD_MODULES. *)
let variables = ["INITRD_MODULES"; "DOMU_INITRD_MODULES"] in
let xen_modules = ["xennet"; "xen-vnif"; "xenblk"; "xen-vbd"] in
let modified = ref false in
List.iter (
fun var ->
List.iter (
fun xen_mod ->
let expr =
sprintf "/file/etc/sysconfig/kernel/%s/value[. = '%s']"
var xen_mod in
let entries = g#aug_match expr in
let entries = Array.to_list entries in
if entries <> [] then (
List.iter (fun e -> ignore (g#aug_rm e)) entries;
modified := true
)
) xen_modules
) variables;
if !modified then g#aug_save ()
);
and unconfigure_vbox () =
(* Uninstall VirtualBox Guest Additions. *)
let package_name = "virtualbox-guest-additions" in
let has_guest_additions =
List.exists (
fun { G.app2_name = name } -> name = package_name
) inspect.i_apps in
if has_guest_additions then
Linux.remove g inspect [package_name];
(* Guest Additions might have been installed from a tarball. The
* above code won't detect this case. Look for the uninstall tool
* and try running it.
*
* Note that it's important we do this early in the conversion
* process, as this uninstallation script naively overwrites
* configuration files with versions it cached prior to
* installation.
*)
let vboxconfig = "/var/lib/VBoxGuestAdditions/config" in
if g#is_file ~followsymlinks:true vboxconfig then (
let lines = g#read_lines vboxconfig in
let lines = Array.to_list lines in
let rex = PCRE.compile "^INSTALL_DIR=(.*)$" in
let lines = List.filter_map (
fun line ->
if PCRE.matches rex line then (
let path = PCRE.sub 1 in
let path = shell_unquote path in
if String.length path >= 1 && path.[0] = '/' then (
let vboxuninstall = path ^ "/uninstall.sh" in
Some vboxuninstall
)
else None
)
else None
) lines in
let lines = List.filter (g#is_file ~followsymlinks:true) lines in
match lines with
| [] -> ()
| vboxuninstall :: _ ->
try
ignore (g#command [| vboxuninstall |]);
(* Reload Augeas to detect changes made by vbox tools uninst. *)
Linux.augeas_reload g
with
G.Error msg ->
warning (f_"VirtualBox Guest Additions were detected, but uninstallation failed. The error message was: %s (ignored)")
msg
)
and unconfigure_vmware () =
(* Look for any configured VMware yum repos and disable them. *)
let repos =
g#aug_match "/files/etc/yum.repos.d/*/*[baseurl =~ regexp('https?://([^/]+\\.)?vmware\\.com/.*')]" in
let repos = Array.to_list repos in
List.iter (
fun repo ->
g#aug_set (repo ^ "/enabled") "0";
g#aug_save ()
) repos;
(* Uninstall VMware Tools. *)
let remove = ref [] and libraries = ref [] in
(* On Ubuntu, the ubuntu-server metapackage depends on
* open-vm-tools, and thus any attempt to remove it will cause
* dependency issues. Hence, special case this situation, and
* leave open-vm-tools installed in this case.
*)
let has_ubuntu_server =
if family = `Debian_family then
List.exists (
fun { G.app2_name = name } ->
name = "ubuntu-server"
) inspect.i_apps
else false in
List.iter (
fun { G.app2_name = name } ->
if String.is_prefix name "vmware-tools-libraries-" then
List.push_front name libraries
else if String.is_prefix name "vmware-tools-" then
List.push_front name remove
else if name = "VMwareTools" then
List.push_front name remove
else if String.is_prefix name "kmod-vmware-tools" then
List.push_front name remove
else if String.is_prefix name "open-vm-tools-" then
List.push_front name remove
else if name = "open-vm-tools" && not has_ubuntu_server then
List.push_front name remove
) inspect.i_apps;
let libraries = !libraries in
(* VMware tools includes 'libraries' packages which provide custom
* versions of core functionality. We need to install non-custom
* versions of everything provided by these packages before
* attempting to uninstall them, or we'll hit dependency
* issues.
*)
if libraries <> [] then (
(* We only support removal of libraries on systems which use yum. *)
if inspect.i_package_management = "yum" then (
List.iter (
fun library ->
let provides =
g#command_lines [| "rpm"; "-q"; "--provides"; library |] in
let provides = Array.to_list provides in
(* The packages provide themselves, filter this out. *)
let provides =
List.filter (
fun s ->
not (library = s || String.is_prefix s (library ^ " = "))
) provides in
(* If the package provides something other than itself, then
* proceed installing the replacements; in the other case,
* just mark the package for removal, as it means no other
* package can depend on something provided.
*)
if provides <> [] then (
(* Trim whitespace. *)
let provides = List.map String.trim provides in
(* Install the dependencies with yum. Use yum explicitly
* because we don't have package names and local install is
* impractical.
*)
let cmd = ["yum"; "-q"; "resolvedep"] @ provides in
let cmd = Array.of_list cmd in
let replacements = g#command_lines cmd in
let replacements = Array.to_list replacements in
let cmd = [ "yum"; "install"; "-y" ] @ replacements in
let cmd = Array.of_list cmd in
(try
ignore (g#command cmd);
List.push_front library remove
with G.Error msg ->
eprintf "%s: could not install replacement for %s. Error was: %s. %s was not removed.\n"
prog library msg library
);
) else (
List.push_front library remove;
);
) libraries
)
);
let remove = !remove in
Linux.remove g inspect remove;
(* VMware Tools may have been installed from a tarball, so the
* above code won't remove it. Look for the uninstall tool and run
* if present.
*)
let uninstaller = "/usr/bin/vmware-uninstall-tools.pl" in
if g#is_file ~followsymlinks:true uninstaller then (
try
(* The VMware tools uninstaller will rebuild the ramdisk for
* the kernels present either at installation time, or at
* later time (when the tools are applied to newly
* installed kernels). Since we do not want to potentially
* rebuilt all the available kernels, trick the "database"
* of the VMware tools installation to not do any ramdisk
* restore. In any case, we will rebuilt the ramdisk of the
* default kernel already.
*)
let locations = "/etc/vmware-tools/locations" in
if g#is_file ~followsymlinks:true locations then (
g#write_append locations "remove_answer RESTORE_RAMDISK_CMD\n";
g#write_append locations "remove_answer RESTORE_RAMDISK_KERNELS\n";
g#write_append locations "remove_answer RESTORE_RAMDISK_ONECALL\n";
);
if family = `SUSE_family then
ignore (g#command [| "/usr/bin/env";
"rootdev=" ^ inspect.i_root;
uninstaller |])
else
ignore (g#command [| uninstaller |]);
(* Reload Augeas to detect changes made by vbox tools uninst. *)
Linux.augeas_reload g
with
G.Error msg ->
warning (f_"VMware tools was detected, but uninstallation failed. The error message was: %s (ignored)")
msg
)
and unconfigure_citrix () =
let pkgs =
List.filter (
fun { G.app2_name = name } -> String.is_prefix name "xe-guest-utilities"
) inspect.i_apps in
let pkgs = List.map (fun { G.app2_name = name } -> name) pkgs in
if pkgs <> [] then (
Linux.remove g inspect pkgs;
(* Installing these guest utilities automatically unconfigures
* ttys in /etc/inittab if the system uses it. We need to put
* them back.
*)
let rex = PCRE.compile "^([1-6]):([2-5]+):respawn:(.*)" in
let updated = ref false in
let rec loop () =
let comments = g#aug_match "/files/etc/inittab/#comment" in
let comments = Array.to_list comments in
match comments with
| [] -> ()
| commentp :: _ ->
let comment = g#aug_get commentp in
if PCRE.matches rex comment then (
let name = PCRE.sub 1
and runlevels = PCRE.sub 2
and process = PCRE.sub 3 in
if String.find process "getty" >= 0 then (
updated := true;
(* Create a new entry immediately after the comment. *)
g#aug_insert commentp name false;
g#aug_set ("/files/etc/inittab/" ^ name ^ "/runlevels") runlevels;
g#aug_set ("/files/etc/inittab/" ^ name ^ "/action") "respawn";
g#aug_set ("/files/etc/inittab/" ^ name ^ "/process") process;
(* Delete the comment node. *)
ignore (g#aug_rm commentp);
(* As the aug_rm invalidates the output of aug_match, we
* now have to restart the whole loop.
*)
loop ()
)
)
in
loop ();
if !updated then g#aug_save ();
)
and unconfigure_kudzu () =
(* Disable kudzu in the guest
* Kudzu will detect the changed network hardware at boot time and
* either:
* - require manual intervention, or
* - disable the network interface
* Neither of these behaviours is desirable.
*)
if g#is_file ~followsymlinks:true "/etc/init.d/kudzu"
&& g#is_file ~followsymlinks:true "/sbin/chkconfig" then (
ignore (g#command [| "/sbin/chkconfig"; "kudzu"; "off" |])
)
and unconfigure_prltools () =
let prltools_path = "/usr/lib/parallels-tools/install" in
if g#is_file ~followsymlinks:true prltools_path then (
try
ignore (g#command [| prltools_path; "-r" |]);
(* Reload Augeas to detect changes made by prltools uninst. *)
Linux.augeas_reload g
with
G.Error msg ->
warning (f_"Parallels tools was detected, but uninstallation failed. The error message was: %s (ignored)")
msg
)
and install_linux_tools () =
let has_qemu_guest_agent =
List.exists (
fun { G.app2_name = name } ->
name = "qemu-guest-agent"
) inspect.i_apps in
if not has_qemu_guest_agent then
Windows_virtio.install_linux_tools g inspect
and configure_kernel () =
(* Previously this function would try to install kernels, but we
* don't do that any longer.
*)
(* Check a non-Xen kernel exists. *)
let only_xen_kernels = List.for_all (
fun { ki_is_xen_pv_only_kernel = pv_only } -> pv_only
) bootloader_kernels in
if only_xen_kernels then
error (f_"only Xen kernels are installed in this guest.\n\nRead the %s(1) manual, section \"Xen paravirtualized guests\", to see what to do.") prog;
(* Enable the best non-Xen kernel, where "best" means the one with
* the highest version, preferring non-debug kernels which support
* virtio.
*)
let best_kernel =
let compare_best_kernels k1 k2 =
let i = compare k1.ki_supports_virtio_net k2.ki_supports_virtio_net in
if i <> 0 then i
else (
let i = compare_app2_versions k1.ki_app k2.ki_app in
if i <> 0 then i
(* Favour non-debug kernels over debug kernels (RHBZ#1170073). *)
else compare k2.ki_is_debug k1.ki_is_debug
)
in
let kernels = bootloader_kernels in
let kernels =
List.filter (fun { ki_is_xen_pv_only_kernel = pv_only } -> not pv_only)
kernels in
let kernels = List.sort compare_best_kernels kernels in
let kernels = List.rev kernels (* so best is first *) in
List.hd kernels in
if verbose () then (
eprintf "best kernel for this guest:\n";
print_kernel_info stderr "\t" best_kernel
);
if best_kernel <> List.hd bootloader_kernels then (
debug "best kernel is not the bootloader default, setting bootloader default ...";
bootloader#set_default_kernel best_kernel.ki_vmlinuz
);
(* Update /etc/sysconfig/kernel DEFAULTKERNEL (RHBZ#1176801). *)
if g#is_file ~followsymlinks:true "/etc/sysconfig/kernel" then (
let entries =
g#aug_match "/files/etc/sysconfig/kernel/DEFAULTKERNEL/value" in
let entries = Array.to_list entries in
if entries <> [] then (
List.iter (fun path -> g#aug_set path best_kernel.ki_name) entries;
g#aug_save ()
)
);
best_kernel
(* Even though the kernel was already installed (this version of
* virt-v2v does not install new kernels), it could have an
* initrd that does not have support virtio. Therefore rebuild
* the initrd.
*)
and rebuild_initrd kernel =
match kernel.ki_initrd with
| None -> ()
| Some initrd ->
(* Enable the basic virtio modules in the kernel. *)
let modules =
let modules =
(* The order of modules here is deliberately the same as the
* order specified in the postinstall script of kmod-virtio in
* RHEL3. The reason is that the probing order determines the
* major number of vdX block devices. If we change it, RHEL 3
* KVM guests won't boot.
*)
List.filter (fun m -> List.mem m kernel.ki_modules)
[ "virtio"; "virtio_ring"; "virtio_blk";
"virtio_scsi"; "virtio_net"; "virtio_pci" ] in
if modules <> [] then modules
else
(* Fallback copied from old virt-v2v. XXX Why not "ide"? *)
[ "sym53c8xx" ] in
(* Move the old initrd file out of the way. Note that dracut/mkinitrd
* will refuse to overwrite an old file so we have to do this.
*)
g#mv initrd (initrd ^ ".pre-v2v");
(* dracut and mkinitrd want what they call the "kernel version". What
* they actually mean is the last element of the module path
* (eg. /lib/modules/2.6.32-496.el6.x86_64 -> 2.6.32-496.el6.x86_64)
* which might include the arch. Get that here.
*)
let mkinitrd_kv =
let modpath = kernel.ki_modpath in
match last_part_of modpath '/' with
| Some x -> x
| None -> invalid_arg (sprintf "invalid module path: %s" modpath) in
let run_dracut_command dracut_path =
(* Dracut. *)
let args =
dracut_path ::
(if verbose () then [ "--verbose" ] else [])
@ [ "--add-drivers"; String.concat " " modules; initrd; mkinitrd_kv ]
in
ignore (g#command (Array.of_list args))
in
let run_update_initramfs_command () =
let args =
"/usr/sbin/update-initramfs" ::
(if verbose () then [ "-v" ] else [])
@ [ "-c"; "-k"; mkinitrd_kv ]
in
ignore (g#command (Array.of_list args))
in
if g#is_file ~followsymlinks:true "/sbin/dracut" then
run_dracut_command "/sbin/dracut"
else if g#is_file ~followsymlinks:true "/usr/bin/dracut" then
run_dracut_command "/usr/bin/dracut"
else if family = `SUSE_family
&& g#is_file ~followsymlinks:true "/sbin/mkinitrd" then (
ignore (
g#command [| "/usr/bin/env";
"rootdev=" ^ inspect.i_root;
"/sbin/mkinitrd";
"-m"; String.concat " " modules;
"-i"; initrd;
"-k"; kernel.ki_vmlinuz;
"-d"; inspect.i_root |]
)
)
else if family = `Debian_family then (
if not (g#is_file ~followsymlinks:true "/usr/sbin/update-initramfs") then
error (f_"unable to rebuild initrd (%s) because update-initramfs was not found in the guest")
initrd;
if List.length modules > 0 then (
(* The modules to add to initrd are defined in:
* /etc/initramfs-tools/modules
* File format is same as modules(5).
*)
let path = "/files/etc/initramfs-tools/modules" in
g#aug_transform "modules" "/etc/initramfs-tools/modules";
Linux.augeas_reload g;
g#aug_set (sprintf "%s/#comment[last()+1]" path)
"The following modules were added by virt-v2v";
List.iter (
fun m -> g#aug_clear (sprintf "%s/%s" path m)
) modules;
g#aug_save ();
);
run_update_initramfs_command ()
)
else if g#is_file ~followsymlinks:true "/usr/sbin/make-initrd" then (
ignore (
g#command [|
(* by default make-initrd running in vm add virtio and other
* needed to boot modules
*)
"/usr/sbin/make-initrd";
"-k"; kernel.ki_version;
|]
)
)
else if g#is_file ~followsymlinks:true "/sbin/mkinitrd" then (
let module_args = List.map (sprintf "--with=%s") modules in
let args =
[ "/sbin/mkinitrd" ] @ module_args @ [ initrd; mkinitrd_kv ] in
(* We explicitly modprobe ext2 here. This is required by
* mkinitrd on RHEL 3, and shouldn't hurt on other OSs. We
* don't care if this fails.
*)
(try g#modprobe "ext2" with G.Error _ -> ());
(* loop is a module in RHEL 5. Try to load it. Doesn't matter
* for other OSs if it doesn't exist, but RHEL 5 will complain:
* "All of your loopback devices are in use."
*)
(try g#modprobe "loop" with G.Error _ -> ());
(* On RHEL 3 we have to take extra gritty to get a working
* loopdev. mkinitrd runs the nash command `findlodev'
* which does this:
*
* for (devNum = 0; devNum < 256; devNum++) {
* sprintf(devName, "/dev/loop%s%d", separator, devNum);
* if ((fd = open(devName, O_RDONLY)) < 0) return 0;
* if (ioctl(fd, LOOP_GET_STATUS, &loopInfo)) {
* close(fd);
* printf("%s\n", devName);
* return 0;
* // etc
*
* In a modern kernel, /dev/loop<N> isn't created until it is
* used. But we can create /dev/loop0 manually. Note we have
* to do this in the appliance /dev. (RHBZ#1171130)
*)
if family = `RHEL_family && inspect.i_major_version = 3 then
ignore (g#debug "sh" [| "mknod"; "-m"; "0666";
"/dev/loop0"; "b"; "7"; "0" |]);
(* RHEL 4 mkinitrd determines if the root filesystem is on LVM
* by checking if the device name (after following symlinks)
* starts with /dev/mapper. However, on recent kernels/udevs,
* /dev/mapper/foo is just a symlink to /dev/dm-X. This means
* that RHEL 4 mkinitrd running in the appliance fails to
* detect root on LVM. We check ourselves if root is on LVM,
* and frig RHEL 4's mkinitrd if it is by setting root_lvm=1 in
* its environment. This overrides an internal variable in
* mkinitrd, and is therefore extremely nasty and applicable
* only to a particular version of mkinitrd.
*)
let env =
if family = `RHEL_family && inspect.i_major_version = 4 then
Some "root_lvm=1"
else
None in
match env with
| None -> ignore (g#command (Array.of_list args))
| Some env ->
let cmd = sprintf "sh -c '%s %s'" env (String.concat " " args) in
ignore (g#sh cmd)
)
else (
error (f_"unable to rebuild initrd (%s) because mkinitrd or dracut was not found in the guest")
initrd
)
(* We configure a console on ttyS0. Make sure existing console
* references use it. N.B. Note that the RHEL 6 xen guest kernel
* presents a console device called /dev/hvc0, whereas previous xen
* guest kernels presented /dev/xvc0. The regular kernel running
* under KVM also presents a virtio console device called /dev/hvc0,
* so ideally we would just leave it alone. However, RHEL 6 libvirt
* doesn't yet support this device so we can't attach to it. We
* therefore use /dev/ttyS0 for RHEL 6 anyway.
*)
and configure_console () =
(* Look for gettys using xvc0 or hvc0. RHEL 6 doesn't use inittab
* but this still works.
*)
let paths = g#aug_match "/files/etc/inittab/*/process" in
let paths = Array.to_list paths in
let rex = PCRE.compile "\\b([xh]vc0)\\b" in
List.iter (
fun path ->
let proc = g#aug_get path in
let proc' = PCRE.replace ~global:true rex "ttyS0" proc in
if proc <> proc' then g#aug_set path proc'
) paths;
let paths = g#aug_match "/files/etc/securetty/*" in
let paths = Array.to_list paths in
List.iter (
fun path ->
let tty = g#aug_get path in
if tty = "xvc0" || tty = "hvc0" then
g#aug_set path "ttyS0"
) paths;
g#aug_save ()
(* If the target doesn't support a serial console, we want to remove
* all references to it instead.
*)
and remove_console () =
(* Look for gettys using xvc0 or hvc0. RHEL 6 doesn't use inittab
* but this still works.
*)
let paths = g#aug_match "/files/etc/inittab/*/process" in
let paths = Array.to_list paths in
let rex = PCRE.compile "\\b([xh]vc0|ttyS0)\\b" in
List.iter (
fun path ->
let proc = g#aug_get path in
if PCRE.matches rex proc then
ignore (g#aug_rm (path ^ "/.."))
) paths;
let paths = g#aug_match "/files/etc/securetty/*" in
let paths = Array.to_list paths in
List.iter (
fun path ->
let tty = g#aug_get path in
if tty = "xvc0" || tty = "hvc0" then
ignore (g#aug_rm path)
) paths;
g#aug_save ()
and supports_acpi () =
(* ACPI known to cause RHEL 3 to fail. *)
if family = `RHEL_family && inspect.i_major_version == 3 then
false
else
true
and configure_display_driver () =
let video_driver = "qxl" in
let updated = ref false in
let xorg_conf =
if not (g#is_file ~followsymlinks:true "/etc/X11/xorg.conf") &&
g#is_file ~followsymlinks:true "/etc/X11/XF86Config"
then (
g#aug_set "/augeas/load/Xorg/incl[last()+1]" "/etc/X11/XF86Config";
g#aug_load ();
"/etc/X11/XF86Config"
)
else
"/etc/X11/xorg.conf" in
let paths = g#aug_match ("/files" ^ xorg_conf ^ "/Device/Driver") in
Array.iter (
fun path ->
g#aug_set path video_driver;
updated := true
) paths;
(* Remove VendorName and BoardName if present. *)
let paths = g#aug_match ("/files" ^ xorg_conf ^ "/Device/VendorName") in
Array.iter (fun path -> ignore (g#aug_rm path)) paths;
let paths = g#aug_match ("/files" ^ xorg_conf ^ "/Device/BoardName") in
Array.iter (fun path -> ignore (g#aug_rm path)) paths;
g#aug_save ();
(* If we updated the X driver, check that X itself is installed,
* and warn if not. Old virt-v2v used to attempt to install X here
* but that way lies insanity and ruin.
*)
if !updated &&
not (g#is_file ~followsymlinks:true "/usr/bin/X") &&
not (g#is_file ~followsymlinks:true "/usr/bin/X11/X") then
warning (f_"The display driver was updated to ‘%s’, but X11 does not seem to be installed in the guest. X may not function correctly.")
video_driver
and configure_kernel_modules block_type net_type =
(* This function modifies modules.conf (and its various aliases). *)
let augeas_modprobe query =
(* Execute g#aug_match, but against every known location of
modules.conf. *)
let paths = [
"/files/etc/conf.modules/alias"; (* modules_conf.aug *)
"/files/etc/modules.conf/alias";
"/files/etc/modprobe.conf/alias"; (* modprobe.aug *)
"/files/etc/modprobe.conf.local/alias";
"/files/etc/modprobe.d/*/alias";
] in
let paths =
List.map (
fun p ->
let p = sprintf "%s[%s]" p query in
Array.to_list (g#aug_match p)
) paths in
List.flatten paths
and discover_modpath () =
(* Find what /etc/modprobe.conf is called today. *)
if g#is_dir ~followsymlinks:true "/etc/modprobe.d" then (
(* Create a new file /etc/modprobe.d/virt-v2v-added.conf. *)
"/etc/modprobe.d/virt-v2v-added.conf"
) else (
(* List of methods, in order of preference. *)
let paths = [
"/etc/modprobe.conf.local";
"/etc/modprobe.conf";
"/etc/modules.conf";
"/etc/conf.modules"
] in
try List.find (g#is_file ~followsymlinks:true) paths
with Not_found ->
error (f_"unable to find any valid modprobe configuration file such as /etc/modprobe.conf");
)
in
(* Update 'alias eth0 ...'. *)
let paths = augeas_modprobe ". =~ regexp('eth[0-9]+')" in
let net_device =
match net_type with
| Virtio_net -> "virtio_net"
| E1000 -> "e1000"
| RTL8139 -> "rtl8139cp"
in
List.iter (
fun path -> g#aug_set (path ^ "/modulename") net_device
) paths;
(* Update 'alias scsi_hostadapter ...' *)
let paths = augeas_modprobe ". =~ regexp('scsi_hostadapter.*')" in
(match block_type with
| Virtio_blk ->
let block_module = "virtio_blk" in
if paths <> [] then (
(* There's only 1 scsi controller in the converted guest.
* Convert only the first scsi_hostadapter entry to virtio
* and delete other scsi_hostadapter entries.
*)
let path, paths_to_delete = List.hd paths, List.tl paths in
(* Note that we delete paths in reverse order. This means we don't
* have to worry about alias indices being changed.
*)
List.iter (fun path -> ignore (g#aug_rm path))
(List.rev paths_to_delete);
g#aug_set (path ^ "/modulename") block_module
) else (
(* We have to add a scsi_hostadapter. *)
let modpath = discover_modpath () in
g#aug_set (sprintf "/files%s/alias[last()+1]" modpath)
"scsi_hostadapter";
g#aug_set (sprintf "/files%s/alias[last()]/modulename" modpath)
block_module
)
| IDE ->
(* There is no scsi controller in an IDE guest. *)
List.iter (fun path -> ignore (g#aug_rm path)) (List.rev paths)
);
(* Display a warning about any leftover Xen modules which we
* haven't converted. These are likely to cause an error when
* we run mkinitrd.
*)
let xen_modules = [ "xennet"; "xen-vnif"; "xenblk"; "xen-vbd" ] in
let query =
"modulename =~ regexp('" ^ String.concat "|" xen_modules ^ "')" in
let paths = augeas_modprobe query in
List.iter (
fun path ->
let device = g#aug_get path in
let module_ = g#aug_get (path ^ "/modulename") in
warning (f_"don’t know how to update %s which loads the %s module")
device module_;
) paths;
(* Update files. *)
g#aug_save ()
and remap_block_devices block_type =
(* This function's job is to iterate over boot configuration
* files, replacing "hda" with "vda" or whatever is appropriate.
* This is mostly applicable to old guests, since newer OSes use
* LABEL or UUID where possible.
*
* The original Convert::Linux::_remap_block_devices function was
* very complex indeed. This drops most of the complexity. In
* particular it assumes all non-removable source disks will be
* added to the target in the order they appear in the libvirt XML.
*)
let ide_block_prefix =
match family, inspect.i_major_version with
| `RHEL_family, v when v < 5 ->
(* RHEL < 5 used old ide driver *) "hd"
| `RHEL_family, 5 ->
(* RHEL 5 uses libata, but udev still uses: *) "hd"
| `SUSE_family, _ ->
(* SUSE uses libata, but still presents IDE disks as: *) "hd"
| _, _ ->
(* All modern distros use libata: *) "sd" in
let block_prefix_after_conversion =
match block_type with
| Virtio_blk -> "vd"
| IDE -> ide_block_prefix in
let map =
List.mapi (
fun i disk ->
let block_prefix_before_conversion =
match disk.s_controller with
| Some Source_IDE -> ide_block_prefix
| Some (Source_virtio_SCSI | Source_SCSI | Source_SATA) -> "sd"