2 # Copyright (C) 2009 Red Hat Inc.
4 # This library is free software; you can redistribute it and/or
5 # modify it under the terms of the GNU Lesser General Public
6 # License as published by the Free Software Foundation; either
7 # version 2 of the License, or (at your option) any later version.
9 # This library is distributed in the hope that it will be useful,
10 # but WITHOUT ANY WARRANTY; without even the implied warranty of
11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 # Lesser General Public License for more details.
14 # You should have received a copy of the GNU Lesser General Public
15 # License along with this library; if not, write to the Free Software
16 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18 package Sys::Guestfs::Lib;
24 use File::Temp qw/tempdir/;
25 use Locale::TextDomain 'libguestfs';
28 eval "use Sys::Virt;";
29 eval "use XML::XPath;";
30 eval "use XML::XPath::XMLParser;";
36 Sys::Guestfs::Lib - Useful functions for using libguestfs from Perl
40 use Sys::Guestfs::Lib qw(open_guest inspect_all_partitions ...);
42 $g = open_guest ($name);
44 %fses = inspect_all_partitions ($g, \@partitions);
46 (and many more calls - see the rest of this manpage)
50 C<Sys::Guestfs::Lib> is an extra library of useful functions for using
51 the libguestfs API from Perl. It also provides tighter integration
54 The basic libguestfs API is not covered by this manpage. Please refer
55 instead to L<Sys::Guestfs(3)> and L<guestfs(3)>. The libvirt API is
56 also not covered. For that, see L<Sys::Virt(3)>.
58 =head1 BASIC FUNCTIONS
64 use vars qw(@EXPORT_OK @ISA);
67 @EXPORT_OK = qw(open_guest get_partitions resolve_windows_path
68 inspect_all_partitions inspect_partition
69 inspect_operating_systems mount_operating_system inspect_in_detail);
73 $g = open_guest ($name);
75 $g = open_guest ($name, rw => 1, ...);
77 $g = open_guest ($name, address => $uri, ...);
79 $g = open_guest ([$img1, $img2, ...], address => $uri, ...);
81 ($g, $conn, $dom) = open_guest ($name);
83 This function opens a libguestfs handle for either the libvirt domain
84 called C<$name>, or the disk image called C<$name>. Any disk images
85 found through libvirt or specified explicitly are attached to the
88 The C<Sys::Guestfs> handle C<$g> is returned, or if there was an error
89 it throws an exception. To catch errors, wrap the call in an eval
92 The first parameter is either a string referring to a libvirt domain
93 or a disk image, or (if a guest has several disk images) an arrayref
94 C<[$img1, $img2, ...]>.
96 The handle is I<read-only> by default. Use the optional parameter
97 C<rw =E<gt> 1> to open a read-write handle. However if you open a
98 read-write handle, this function will refuse to use active libvirt
101 The handle is still in the config state when it is returned, so you
102 have to call C<$g-E<gt>launch ()> and C<$g-E<gt>wait_ready>.
104 The optional C<address> parameter can be added to specify the libvirt
105 URI. In addition, L<Sys::Virt(3)> lists other parameters which are
106 passed through to C<Sys::Virt-E<gt>new> unchanged.
108 The implicit libvirt handle is closed after this function, I<unless>
109 you call the function in C<wantarray> context, in which case the
110 function returns a tuple of: the open libguestfs handle, the open
111 libvirt handle, and the open libvirt domain handle. (This is useful
112 if you want to do other things like pulling the XML description of the
113 guest). Note that if this is a straight disk image, then C<$conn> and
114 C<$dom> will be C<undef>.
116 If the C<Sys::Virt> module is not available, then libvirt is bypassed,
117 and this function can only open disk images.
127 my $readwrite = $params{rw};
130 if (ref ($first) eq "ARRAY") {
132 } elsif (ref ($first) eq "SCALAR") {
135 die __"open_guest: first parameter must be a string or an arrayref"
142 die __x("guest image {imagename} does not exist or is not readable",
147 die __"open_guest: no libvirt support (install Sys::Virt, XML::XPath and XML::XPath::XMLParser)"
148 unless exists $INC{"Sys/Virt.pm"} &&
149 exists $INC{"XML/XPath.pm"} &&
150 exists $INC{"XML/XPath/XMLParser.pm"};
152 die __"open_guest: too many domains listed on command line"
155 $conn = Sys::Virt->new (readonly => 1, @_);
156 die __"open_guest: cannot connect to libvirt" unless $conn;
158 my @doms = $conn->list_defined_domains ();
159 my $isitinactive = 1;
160 unless ($readwrite) {
161 # In the case where we want read-only access to a domain,
162 # allow the user to specify an active domain too.
163 push @doms, $conn->list_domains ();
167 if ($_->get_name () eq $images[0]) {
175 die __x("{imagename} is not the name of an inactive libvirt domain\n",
176 imagename => $images[0]);
178 die __x("{imagename} is not the name of a libvirt domain\n",
179 imagename => $images[0]);
183 # Get the names of the image(s).
184 my $xml = $dom->get_xml_description ();
186 my $p = XML::XPath->new (xml => $xml);
187 my @disks = $p->findnodes ('//devices/disk/source/@dev');
188 push (@disks, $p->findnodes ('//devices/disk/source/@file'));
190 die __x("{imagename} seems to have no disk devices\n",
191 imagename => $images[0])
194 @images = map { $_->getData } @disks;
197 # We've now got the list of @images, so feed them to libguestfs.
198 my $g = Sys::Guestfs->new ();
203 $g->add_drive_ro ($_);
207 return wantarray ? ($g, $conn, $dom) : $g
210 =head2 get_partitions
212 @partitions = get_partitions ($g);
214 This function takes an open libguestfs handle C<$g> and returns all
215 partitions and logical volumes found on it.
217 What is returned is everything that could contain a filesystem (or
218 swap). Physical volumes are excluded from the list, and so are any
219 devices which are partitioned (eg. C</dev/sda> would not be returned
220 if C</dev/sda1> exists).
228 my @partitions = $g->list_partitions ();
229 my @pvs = $g->pvs ();
230 @partitions = grep { ! _is_pv ($_, @pvs) } @partitions;
232 my @lvs = $g->lvs ();
234 return sort (@lvs, @partitions);
242 return 1 if $_ eq $t;
247 =head2 resolve_windows_path
249 $path = resolve_windows_path ($g, $path);
251 $path = resolve_windows_path ($g, "/windows/system");
252 ==> "/WINDOWS/System"
253 or undef if no path exists
255 This function, which is specific to FAT/NTFS filesystems (ie. Windows
256 guests), lets you look up a case insensitive C<$path> in the
257 filesystem and returns the true, case sensitive path as required by
258 the underlying kernel or NTFS-3g driver.
260 If C<$path> does not exist then this function returns C<undef>.
262 The C<$path> parameter must begin with C</> character and be separated
263 by C</> characters. Do not use C<\>, drive names, etc.
267 sub resolve_windows_path
273 if (substr ($path, 0, 1) ne "/") {
274 warn __"resolve_windows_path: path must start with a / character";
278 my @elems = split (/\//, $path);
281 # Start reconstructing the path at the top.
284 foreach my $dir (@elems) {
286 foreach ($g->ls ($path)) {
287 if (lc ($_) eq lc ($dir)) {
297 return undef unless $found;
303 =head1 OPERATING SYSTEM INSPECTION FUNCTIONS
305 The functions in this section can be used to inspect the operating
306 system(s) available inside a virtual machine image. For example, you
307 can find out if the VM is Linux or Windows, how the partitions are
308 meant to be mounted, and what applications are installed.
310 If you just want a simple command-line interface to this
311 functionality, use the L<virt-inspector(1)> tool. The documentation
312 below covers the case where you want to access this functionality from
315 Once you have the list of partitions (from C<get_partitions>) there
316 are several steps involved:
322 Look at each partition separately and find out what is on it.
324 The information you get back includes whether the partition contains a
325 filesystem or swapspace, what sort of filesystem (eg. ext3, ntfs), and
326 a first pass guess at the content of the filesystem (eg. Linux boot,
329 The result of this step is a C<%fs> hash of information, one hash for
332 See: C<inspect_partition>, C<inspect_all_partitions>
336 Work out the relationship between partitions.
338 In this step we work out how partitions are related to each other. In
339 the case of a single-boot VM, we work out how the partitions are
340 mounted in respect of each other (eg. C</dev/sda1> is mounted as
341 C</boot>). In the case of a multi-boot VM where there are several
342 roots, we may identify several operating system roots, and mountpoints
345 The result of this step is a single hash called C<%oses> which is
346 described in more detail below, but at the top level looks like:
349 '/dev/VG/Root1' => \%os1,
350 '/dev/VG/Root2' => \%os2,
356 '/' => '/dev/VG/Root1',
357 '/boot' => '/dev/sda1',
362 (example shows a multi-boot VM containing two root partitions).
364 See: C<inspect_operating_systems>
370 Previous to this point we've essentially been looking at each
371 partition in isolation. Now we construct a true guest filesystem by
372 mounting up all of the disks. Only once everything is mounted up can
373 we run commands in the OS context to do more detailed inspection.
375 See: C<mount_operating_system>
379 Check for kernels and applications.
381 This step now does more detailed inspection, where we can look for
382 kernels, applications and more installed in the guest.
384 The result of this is an enhanced C<%os> hash.
386 See: C<inspect_in_detail>
392 This library does not contain functions for generating output based on
393 the analysis steps above. Use a command line tool such as
394 L<virt-inspector(1)> to get useful output.
398 =head2 inspect_all_partitions
400 %fses = inspect_all_partitions ($g, \@partitions);
402 %fses = inspect_all_partitions ($g, \@partitions, use_windows_registry => 1);
404 This calls C<inspect_partition> for each partition in the list
407 The result is a hash which maps partition name to C<\%fs> hashref.
409 The contents of the C<%fs> hash and the meaning of the
410 C<use_windows_registry> flag are explained below.
414 sub inspect_all_partitions
420 return map { $_ => inspect_partition ($g, $_, @_) } @parts;
423 =head2 inspect_partition
425 \%fs = inspect_partition ($g, $partition);
427 \%fs = inspect_partition ($g, $partition, use_windows_registry => 1);
429 This function inspects the device named C<$partition> in isolation and
430 tries to determine what it is. It returns information such as whether
431 the partition is formatted, and with what, whether it is mountable,
432 and what it appears to contain (eg. a Windows root, or a Linux /usr).
434 If C<use_windows_registry> is set to 1, then we will try to download
435 and parse the content of the Windows registry (for Windows root
436 devices). However since this is an expensive and error-prone
437 operation, we don't do this by default. It also requires the external
438 program C<reged>, patched to remove numerous crashing bugs in the
441 The returned value is a hashref C<\%fs> which may contain the
442 following top-level keys (any key can be missing):
448 Filesystem type, eg. "ext2" or "ntfs"
452 Apparent filesystem OS, eg. "linux" or "windows"
456 If set, the partition is a swap partition.
468 If set, the partition could be mounted by libguestfs.
472 Filesystem content, if we could determine it. One of: "linux-grub",
473 "linux-root", "linux-usrlocal", "linux-usr", "windows-root".
477 (For Linux root partitions only).
478 Operating system distribution. One of: "fedora", "redhat",
483 (For root partitions only).
484 Operating system version.
488 (For Linux root partitions only).
489 The contents of the C</etc/fstab> file.
493 (For Windows root partitions only).
494 The contents of the C</boot.ini> (NTLDR) file.
498 The value is an arrayref, which is a list of Windows registry
499 file contents, in Windows C<.REG> format.
505 sub inspect_partition
509 my $dev = shift; # LV or partition name.
512 my $use_windows_registry = $params{use_windows_registry};
514 my %r; # Result hash.
516 # First try 'file(1)' on it.
517 my $file = $g->file ($dev);
518 if ($file =~ /ext2 filesystem data/) {
521 } elsif ($file =~ /ext3 filesystem data/) {
524 } elsif ($file =~ /ext4 filesystem data/) {
527 } elsif ($file =~ m{Linux/i386 swap file}) {
533 # If it's ext2/3/4, then we want the UUID and label.
534 if (exists $r{fstype} && $r{fstype} =~ /^ext/) {
535 $r{uuid} = $g->get_e2uuid ($dev);
536 $r{label} = $g->get_e2label ($dev);
539 # Try mounting it, fnarrr.
541 $r{is_mountable} = 1;
542 eval { $g->mount_ro ($dev, "/") };
544 # It's not mountable, probably empty or some format
545 # we don't understand.
546 $r{is_mountable} = 0;
551 if ($g->is_file ("/grub/menu.lst") ||
552 $g->is_file ("/grub/grub.conf")) {
553 $r{content} = "linux-grub";
554 _check_grub ($g, \%r);
559 if ($g->is_dir ("/etc") && $g->is_dir ("/bin") &&
560 $g->is_file ("/etc/fstab")) {
561 $r{content} = "linux-root";
563 _check_linux_root ($g, \%r);
568 if ($g->is_dir ("/etc") && $g->is_dir ("/bin") &&
569 $g->is_dir ("/share") && !$g->exists ("/local") &&
570 !$g->is_file ("/etc/fstab")) {
571 $r{content} = "linux-usrlocal";
576 if ($g->is_dir ("/etc") && $g->is_dir ("/bin") &&
577 $g->is_dir ("/share") && $g->exists ("/local") &&
578 !$g->is_file ("/etc/fstab")) {
579 $r{content} = "linux-usr";
584 if ($g->is_file ("/AUTOEXEC.BAT") ||
585 $g->is_file ("/autoexec.bat") ||
586 $g->is_dir ("/Program Files") ||
587 $g->is_dir ("/WINDOWS") ||
588 $g->is_file ("/boot.ini") ||
589 $g->is_file ("/ntldr")) {
590 $r{fstype} = "ntfs"; # XXX this is a guess
591 $r{fsos} = "windows";
592 $r{content} = "windows-root";
594 _check_windows_root ($g, \%r, $use_windows_registry);
604 sub _check_linux_root
610 # Look into /etc to see if we recognise the operating system.
611 if ($g->is_file ("/etc/redhat-release")) {
612 $_ = $g->cat ("/etc/redhat-release");
613 if (/Fedora release (\d+\.\d+)/) {
614 $r->{osdistro} = "fedora";
615 $r->{osversion} = "$1"
616 } elsif (/(Red Hat Enterprise Linux|CentOS|Scientific Linux).*release (\d+).*Update (\d+)/) {
617 $r->{osdistro} = "redhat";
618 $r->{osversion} = "$2.$3";
619 } elsif (/(Red Hat Enterprise Linux|CentOS|Scientific Linux).*release (\d+(?:\.(\d+))?)/) {
620 $r->{osdistro} = "redhat";
621 $r->{osversion} = "$2";
623 $r->{osdistro} = "redhat";
625 } elsif ($g->is_file ("/etc/debian_version")) {
626 $_ = $g->cat ("/etc/debian_version");
628 $r->{osdistro} = "debian";
629 $r->{osversion} = "$1";
631 $r->{osdistro} = "debian";
635 # Parse the contents of /etc/fstab. This is pretty vital so
636 # we can determine where filesystems are supposed to be mounted.
637 eval "\$_ = \$g->cat ('/etc/fstab');";
639 my @lines = split /\n/;
642 my @fields = split /[ \t]+/;
644 my $spec = $fields[0]; # first column (dev/label/uuid)
645 my $file = $fields[1]; # second column (mountpoint)
646 if ($spec =~ m{^/} ||
647 $spec =~ m{^LABEL=} ||
648 $spec =~ m{^UUID=} ||
650 push @fstab, [$spec, $file]
654 $r->{fstab} = \@fstab if @fstab;
658 # We only support NT. The control file /boot.ini contains a list of
659 # Windows installations and their %systemroot%s in a simple text
662 # XXX We could parse this better. This won't work if /boot.ini is on
663 # a different drive from the %systemroot%, and in other unusual cases.
665 sub _check_windows_root
670 my $use_windows_registry = shift;
672 my $boot_ini = resolve_windows_path ($g, "/boot.ini");
673 $r->{boot_ini} = $boot_ini;
675 if (defined $r->{boot_ini}) {
676 $_ = $g->cat ($boot_ini);
677 my @lines = split /\n/;
683 } elsif (m/^default=.*?\\(\w+)$/i) {
686 } elsif (m/\\(\w+)=/) {
692 if (defined $systemroot) {
693 $r->{systemroot} = resolve_windows_path ($g, "/$systemroot");
694 if (defined $r->{systemroot} && $use_windows_registry) {
695 _check_windows_registry ($g, $r, $r->{systemroot});
701 sub _check_windows_registry
706 my $systemroot = shift;
708 # Download the system registry files. Only download the
709 # interesting ones, and we don't bother with user profiles at all.
711 my $configdir = resolve_windows_path ($g, "$systemroot/system32/config");
712 if (defined $configdir) {
713 my $softwaredir = resolve_windows_path ($g, "$configdir/software");
714 if (defined $softwaredir) {
715 _load_windows_registry ($g, $r, $softwaredir,
716 "HKEY_LOCAL_MACHINE\\SOFTWARE");
718 my $systemdir = resolve_windows_path ($g, "$configdir/system");
719 if (defined $systemdir) {
720 _load_windows_registry ($g, $r, $systemdir,
721 "HKEY_LOCAL_MACHINE\\System");
726 sub _load_windows_registry
734 my $dir = tempdir (CLEANUP => 1);
736 $g->download ($regfile, "$dir/reg");
738 # 'reged' command is particularly noisy. Redirect stdout and
739 # stderr to /dev/null temporarily.
740 open SAVEOUT, ">&STDOUT";
741 open SAVEERR, ">&STDERR";
742 open STDOUT, ">/dev/null";
743 open STDERR, ">/dev/null";
745 my @cmd = ("reged", "-x", "$dir/reg", "$prefix", "\\", "$dir/out");
746 my $res = system (@cmd);
750 open STDOUT, ">&SAVEOUT";
751 open STDERR, ">&SAVEERR";
756 warn __x("reged command failed: {errormsg}", errormsg => $?);
760 # Some versions of reged segfault on inputs. If that happens we
761 # may get no / partial output file. Anyway, if it exists, load
764 unless (open F, "$dir/out") {
765 warn __x("no output from reged command: {errormsg}", errormsg => $!);
768 { local $/ = undef; $content = <F>; }
772 @registry = @{$r->{registry}} if exists $r->{registry};
773 push @registry, $content;
774 $r->{registry} = \@registry;
783 # Grub version, if we care.
786 =head2 inspect_operating_systems
788 \%oses = inspect_operating_systems ($g, \%fses);
790 This function works out how partitions are related to each other. In
791 the case of a single-boot VM, we work out how the partitions are
792 mounted in respect of each other (eg. C</dev/sda1> is mounted as
793 C</boot>). In the case of a multi-boot VM where there are several
794 roots, we may identify several operating system roots, and mountpoints
797 This function returns a hashref C<\%oses> which at the top level looks
801 '/dev/VG/Root' => \%os,
804 (There can be multiple roots for a multi-boot VM).
806 The C<\%os> hash contains the following keys (any can be omitted):
812 Operating system type, eg. "linux", "windows".
816 Operating system distribution, eg. "debian".
820 Operating system version, eg. "4.0".
824 The value is a reference to the root partition C<%fs> hash.
828 The value is the name of the root partition (as a string).
833 The value is a hashref like this:
836 '/' => '/dev/VG/Root',
837 '/boot' => '/dev/sda1',
842 Filesystems (including swap devices and unmounted partitions).
843 The value is a hashref like this:
847 '/dev/VG/Root' => \%fs,
848 '/dev/VG/Swap' => \%fs,
855 sub inspect_operating_systems
863 foreach (sort keys %$fses) {
864 if ($fses->{$_}->{is_root}) {
869 _get_os_version ($g, \%r);
870 _assign_mount_points ($g, $fses, \%r);
884 $r->{os} = $r->{root}->{fsos} if exists $r->{root}->{fsos};
885 $r->{distro} = $r->{root}->{osdistro} if exists $r->{root}->{osdistro};
886 $r->{version} = $r->{root}->{osversion} if exists $r->{root}->{osversion};
889 sub _assign_mount_points
896 $r->{mounts} = { "/" => $r->{root_device} };
897 $r->{filesystems} = { $r->{root_device} => $r->{root} };
899 # Use /etc/fstab if we have it to mount the rest.
900 if (exists $r->{root}->{fstab}) {
901 my @fstab = @{$r->{root}->{fstab}};
903 my ($spec, $file) = @$_;
905 my ($dev, $fs) = _find_filesystem ($g, $fses, $spec);
907 $r->{mounts}->{$file} = $dev;
908 $r->{filesystems}->{$dev} = $fs;
909 if (exists $fs->{used}) {
920 # Find filesystem by device name, LABEL=.. or UUID=..
929 foreach (sort keys %$fses) {
930 if (exists $fses->{$_}->{label} &&
931 $fses->{$_}->{label} eq $label) {
932 return ($_, $fses->{$_});
935 warn __x("unknown filesystem label {label}\n", label => $label);
937 } elsif (/^UUID=(.*)/) {
939 foreach (sort keys %$fses) {
940 if (exists $fses->{$_}->{uuid} &&
941 $fses->{$_}->{uuid} eq $uuid) {
942 return ($_, $fses->{$_});
945 warn __x("unknown filesystem UUID {uuid}\n", uuid => $uuid);
948 return ($_, $fses->{$_}) if exists $fses->{$_};
950 # The following is to handle the case where an fstab entry specifies a
951 # specific device rather than its label or uuid, and the libguestfs
952 # appliance has named the device differently due to the use of a
954 # This will work as long as the underlying drivers recognise devices in
956 if (m{^/dev/hd(.*)} && exists $fses->{"/dev/sd$1"}) {
957 return ("/dev/sd$1", $fses->{"/dev/sd$1"});
959 if (m{^/dev/xvd(.*)} && exists $fses->{"/dev/sd$1"}) {
960 return ("/dev/sd$1", $fses->{"/dev/sd$1"});
962 if (m{^/dev/mapper/(.*)-(.*)$} && exists $fses->{"/dev/$1/$2"}) {
963 return ("/dev/$1/$2", $fses->{"/dev/$1/$2"});
966 return () if m{/dev/cdrom};
968 warn __x("unknown filesystem {fs}\n", fs => $_);
973 =head2 mount_operating_system
975 mount_operating_system ($g, \%os);
977 This function mounts the operating system described in the
978 C<%os> hash according to the C<mounts> table in that hash (see
979 C<inspect_operating_systems>).
981 The partitions are mounted read-only.
983 To reverse the effect of this call, use the standard
984 libguestfs API call C<$g-E<gt>umount_all ()>.
988 sub mount_operating_system
994 my $mounts = $os->{mounts};
996 # Have to mount / first. Luckily '/' is early in the ASCII
997 # character set, so this should be OK.
998 foreach (sort keys %$mounts) {
999 $g->mount_ro ($mounts->{$_}, $_)
1000 if $_ ne "swap" && $_ ne "none" && ($_ eq '/' || $g->is_dir ($_));
1004 =head2 inspect_in_detail
1006 mount_operating_system ($g, \%os);
1007 inspect_in_detail ($g, \%os);
1010 The C<inspect_in_detail> function inspects the mounted operating
1011 system for installed applications, installed kernels, kernel modules
1014 It adds extra keys to the existing C<%os> hash reflecting what it
1015 finds. These extra keys are:
1021 List of applications.
1027 =item modprobe_aliases
1030 The contents of the modprobe configuration.
1032 =item initrd_modules
1035 The kernel modules installed in the initrd. The value is
1036 a hashref of kernel version to list of modules.
1042 sub inspect_in_detail
1048 _check_for_applications ($g, $os);
1049 _check_for_kernels ($g, $os);
1050 if ($os->{os} eq "linux") {
1051 _check_for_modprobe_aliases ($g, $os);
1052 _check_for_initrd ($g, $os);
1056 sub _check_for_applications
1064 my $osn = $os->{os};
1065 if ($osn eq "linux") {
1066 my $distro = $os->{distro};
1067 if (defined $distro && ($distro eq "redhat" || $distro eq "fedora")) {
1068 my @lines = $g->command_lines
1071 "--qf", "%{name} %{epoch} %{version} %{release} %{arch}\n"]);
1073 if (m/^(.*) (.*) (.*) (.*) (.*)$/) {
1075 $epoch = "" if $epoch eq "(none)";
1087 } elsif ($osn eq "windows") {
1089 # I worked out a general plan for this, but haven't
1090 # implemented it yet. We can iterate over /Program Files
1091 # looking for *.EXE files, which we download, then use
1092 # i686-pc-mingw32-windres on, to find the VERSIONINFO
1093 # section, which has a lot of useful information.
1096 $os->{apps} = \@apps;
1099 sub _check_for_kernels
1107 my $osn = $os->{os};
1108 if ($osn eq "linux") {
1109 # Installed kernels will have a corresponding /lib/modules/<version>
1110 # directory, which is the easiest way to find out what kernels
1111 # are installed, and what modules are available.
1112 foreach ($g->ls ("/lib/modules")) {
1113 if ($g->is_dir ("/lib/modules/$_")) {
1115 $kernel{version} = $_;
1119 foreach ($g->find ("/lib/modules/$_")) {
1120 if (m,/([^/]+)\.ko$, || m,([^/]+)\.o$,) {
1125 $kernel{modules} = \@modules;
1127 push @kernels, \%kernel;
1131 } elsif ($osn eq "windows") {
1135 $os->{kernels} = \@kernels;
1138 # Check /etc/modprobe.conf to see if there are any specified
1139 # drivers associated with network (ethX) or hard drives. Normally
1140 # one might find something like:
1143 # alias scsi_hostadapter xenblk
1145 # XXX This doesn't look beyond /etc/modprobe.conf, eg. in /etc/modprobe.d/
1147 sub _check_for_modprobe_aliases
1155 $success = $g->aug_init("/", 16);
1157 # Register /etc/modules.conf and /etc/conf.modules to the Modprobe lens
1159 @results = $g->aug_match("/augeas/load/Modprobe/incl");
1161 # Calculate the next index of /augeas/load/Modprobe/incl
1163 foreach ( @results ) {
1164 next unless m{/augeas/load/Modprobe/incl\[(\d*)]};
1165 $i = $1 + 1 if ($1 == $i);
1168 $success = $g->aug_set("/augeas/load/Modprobe/incl[$i]",
1169 "/etc/modules.conf");
1171 $success = $g->aug_set("/augeas/load/Modprobe/incl[$i]",
1172 "/etc/conf.modules");
1174 # Make augeas reload
1175 $success = $g->aug_load();
1177 my %modprobe_aliases;
1179 for my $pattern qw(/files/etc/conf.modules/alias
1180 /files/etc/modules.conf/alias
1181 /files/etc/modprobe.conf/alias
1182 /files/etc/modprobe.d/*/alias) {
1183 @results = $g->aug_match($pattern);
1185 for my $path ( @results ) {
1186 $path =~ m{^/files(.*)/alias(?:\[\d*\])?$}
1187 or die __x("{path} doesn't match augeas pattern",
1192 $alias = $g->aug_get($path);
1195 $modulename = $g->aug_get($path.'/modulename');
1198 $aliasinfo{modulename} = $modulename;
1199 $aliasinfo{augeas} = $path;
1200 $aliasinfo{file} = $file;
1202 $modprobe_aliases{$alias} = \%aliasinfo;
1206 $os->{modprobe_aliases} = \%modprobe_aliases;
1209 # Get a listing of device drivers in any initrd corresponding to a
1210 # kernel. This is an indication of what can possibly be booted.
1212 sub _check_for_initrd
1220 foreach my $initrd ($g->ls ("/boot")) {
1221 if ($initrd =~ m/^initrd-(.*)\.img$/ && $g->is_file ("/boot/$initrd")) {
1225 # Disregard old-style compressed ext2 files, since cpio
1226 # takes ages to (fail to) process these.
1227 if ($g->file ("/boot/$initrd") !~ /gzip compressed/ ||
1228 $g->zfile ("gzip", "/boot/$initrd") !~ /ext2 filesystem/) {
1230 @modules = $g->initrd_list ("/boot/$initrd");
1233 @modules = grep { m,([^/]+)\.ko$, || m,([^/]+)\.o$, }
1235 $initrd_modules{$version} = \@modules
1237 warn __x("{filename}: could not read initrd format",
1238 filename => "/boot/$initrd");
1244 $os->{initrd_modules} = \%initrd_modules;
1252 Copyright (C) 2009 Red Hat Inc.
1256 Please see the file COPYING.LIB for the full license.
1260 L<virt-inspector(1)>,
1263 L<http://libguestfs.org/>,
1265 L<http://libvirt.org/>,