417 lines
14 KiB
Perl
417 lines
14 KiB
Perl
use strict;
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use warnings;
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use Class::Struct;
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use XML::LibXML;
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use File::Basename;
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use File::Path;
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use File::stat;
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use File::Copy;
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use File::Slurp;
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use POSIX;
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use Cwd;
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my $defaultConfig = $ARGV[1] or die;
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my $dom = XML::LibXML->load_xml(location => $ARGV[0]);
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sub get { my ($name) = @_; return $dom->findvalue("/expr/attrs/attr[\@name = '$name']/*/\@value"); }
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sub readFile {
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my ($fn) = @_; local $/ = undef;
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open FILE, "<$fn" or return undef; my $s = <FILE>; close FILE;
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local $/ = "\n"; chomp $s; return $s;
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}
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sub writeFile {
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my ($fn, $s) = @_;
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open FILE, ">$fn" or die "cannot create $fn: $!\n";
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print FILE $s or die;
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close FILE or die;
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}
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sub runCommand {
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my ($cmd) = @_;
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open FILE, "$cmd 2>/dev/null |" or die "Failed to execute: $cmd\n";
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my @ret = <FILE>;
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close FILE;
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return ($?, @ret);
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}
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my $grub = get("grub");
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my $grubVersion = int(get("version"));
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my $extraConfig = get("extraConfig");
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my $extraPrepareConfig = get("extraPrepareConfig");
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my $extraPerEntryConfig = get("extraPerEntryConfig");
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my $extraEntries = get("extraEntries");
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my $extraEntriesBeforeNixOS = get("extraEntriesBeforeNixOS") eq "true";
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my $splashImage = get("splashImage");
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my $configurationLimit = int(get("configurationLimit"));
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my $copyKernels = get("copyKernels") eq "true";
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my $timeout = int(get("timeout"));
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my $defaultEntry = int(get("default"));
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my $fsIdentifier = get("fsIdentifier");
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$ENV{'PATH'} = get("path");
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die "unsupported GRUB version\n" if $grubVersion != 1 && $grubVersion != 2;
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print STDERR "updating GRUB $grubVersion menu...\n";
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mkpath("/boot/grub", 0, 0700);
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# Discover whether /boot is on the same filesystem as / and
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# /nix/store. If not, then all kernels and initrds must be copied to
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# /boot.
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if (stat("/boot")->dev != stat("/nix/store")->dev) {
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$copyKernels = 1;
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}
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# Discover information about the location of /boot
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struct(Fs => {
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device => '$',
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type => '$',
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mount => '$',
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});
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sub PathInMount {
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my ($path, $mount) = @_;
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my @splitMount = split /\//, $mount;
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my @splitPath = split /\//, $path;
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if ($#splitPath < $#splitMount) {
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return 0;
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}
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for (my $i = 0; $i <= $#splitMount; $i++) {
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if ($splitMount[$i] ne $splitPath[$i]) {
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return 0;
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}
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}
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return 1;
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}
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sub GetFs {
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my ($dir) = @_;
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my $bestFs = Fs->new(device => "", type => "", mount => "");
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foreach my $fs (read_file("/proc/self/mountinfo")) {
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chomp $fs;
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my @fields = split / /, $fs;
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my $mountPoint = $fields[4];
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next unless -d $mountPoint;
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my @mountOptions = split /,/, $fields[5];
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# Skip the optional fields.
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my $n = 6; $n++ while $fields[$n] ne "-"; $n++;
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my $fsType = $fields[$n];
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my $device = $fields[$n + 1];
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my @superOptions = split /,/, $fields[$n + 2];
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# Skip the read-only bind-mount on /nix/store.
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next if $mountPoint eq "/nix/store" && (grep { $_ eq "rw" } @superOptions) && (grep { $_ eq "ro" } @mountOptions);
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# Ensure this matches the intended directory
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next unless PathInMount($dir, $mountPoint);
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# Is it better than our current match?
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if (length($mountPoint) > length($bestFs->mount)) {
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$bestFs = Fs->new(device => $device, type => $fsType, mount => $mountPoint);
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}
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}
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return $bestFs;
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}
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struct (Grub => {
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path => '$',
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search => '$',
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});
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my $driveid = 1;
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sub GrubFs {
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my ($dir) = @_;
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my $fs = GetFs($dir);
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my $path = "/" . substr($dir, length($fs->mount));
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my $search = "";
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if ($grubVersion > 1) {
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# ZFS is completely separate logic as zpools are always identified by a label
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# or custom UUID
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if ($fs->type eq 'zfs') {
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my $sid = index($fs->device, '/');
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if ($sid < 0) {
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$search = '--label ' . $fs->device;
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$path = '/@' . $path;
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} else {
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$search = '--label ' . substr($fs->device, 0, $sid);
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$path = '/' . substr($fs->device, $sid) . '/@' . $path;
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}
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} else {
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my %types = ('uuid' => '--fs-uuid', 'label' => '--label');
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if ($fsIdentifier eq 'provided') {
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# If the provided dev is identifying the partition using a label or uuid,
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# we should get the label / uuid and do a proper search
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my @matches = $fs->device =~ m/\/dev\/disk\/by-(label|uuid)\/(.*)/;
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if ($#matches > 1) {
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die "Too many matched devices"
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} elsif ($#matches == 1) {
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$search = "$types{$matches[0]} $matches[1]"
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}
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} else {
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# Determine the identifying type
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$search = $types{$fsIdentifier} . ' ';
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# Based on the type pull in the identifier from the system
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my ($status, @devInfo) = runCommand("blkid -o export @{[$fs->device]}");
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if ($status != 0) {
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die "Failed to get blkid info for @{[$fs->mount]} on @{[$fs->device]}";
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}
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my @matches = join("", @devInfo) =~ m/@{[uc $fsIdentifier]}=([^\n]*)/;
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if ($#matches != 0) {
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die "Couldn't find a $types{$fsIdentifier} for @{[$fs->device]}\n"
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}
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$search .= $matches[0];
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}
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# BTRFS is a special case in that we need to fix the referrenced path based on subvolumes
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if ($fs->type eq 'btrfs') {
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my ($status, @id_info) = runCommand("btrfs subvol show @{[$fs->mount]}");
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if ($status != 0) {
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die "Failed to retrieve subvolume info for @{[$fs->mount]}\n";
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}
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my @ids = join("", @id_info) =~ m/Object ID:[ \t\n]*([^ \t\n]*)/;
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if ($#ids > 0) {
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die "Btrfs subvol name for @{[$fs->device]} listed multiple times in mount\n"
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} elsif ($#ids == 0) {
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my ($status, @path_info) = runCommand("btrfs subvol list @{[$fs->mount]}");
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if ($status != 0) {
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die "Failed to find @{[$fs->mount]} subvolume id from btrfs\n";
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}
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my @paths = join("", @path_info) =~ m/ID $ids[0] [^\n]* path ([^\n]*)/;
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if ($#paths > 0) {
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die "Btrfs returned multiple paths for a single subvolume id, mountpoint @{[$fs->mount]}\n";
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} elsif ($#paths != 0) {
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die "Btrfs did not return a path for the subvolume at @{[$fs->mount]}\n";
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}
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$path = "/$paths[0]$path";
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}
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}
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}
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if (not $search eq "") {
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$search = "search --set=drive$driveid " . $search;
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$path = "(\$drive$driveid)$path";
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$driveid += 1;
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}
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}
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return Grub->new(path => $path, search => $search);
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}
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my $grubBoot = GrubFs("/boot");
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my $grubStore;
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if ($copyKernels == 0) {
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$grubStore = GrubFs("/nix/store");
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}
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# Generate the header.
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my $conf .= "# Automatically generated. DO NOT EDIT THIS FILE!\n";
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if ($grubVersion == 1) {
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$conf .= "
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default $defaultEntry
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timeout $timeout
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";
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if ($splashImage) {
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copy $splashImage, "/boot/background.xpm.gz" or die "cannot copy $splashImage to /boot\n";
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$conf .= "splashimage " . $grubBoot->path . "/background.xpm.gz\n";
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}
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}
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else {
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if ($copyKernels == 0) {
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$conf .= "
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" . $grubStore->search;
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}
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$conf .= "
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" . $grubBoot->search . "
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if [ -s \$prefix/grubenv ]; then
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load_env
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fi
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# ‘grub-reboot’ sets a one-time saved entry, which we process here and
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# then delete.
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if [ \"\${saved_entry}\" ]; then
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# The next line *has* to look exactly like this, otherwise KDM's
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# reboot feature won't work properly with GRUB 2.
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set default=\"\${saved_entry}\"
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set saved_entry=
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set prev_saved_entry=
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save_env saved_entry
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save_env prev_saved_entry
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set timeout=1
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else
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set default=$defaultEntry
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set timeout=$timeout
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fi
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if loadfont " . $grubBoot->path . "/grub/fonts/unicode.pf2; then
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set gfxmode=640x480
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insmod gfxterm
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insmod vbe
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terminal_output gfxterm
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fi
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";
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if ($splashImage) {
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# FIXME: GRUB 1.97 doesn't resize the background image if it
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# doesn't match the video resolution.
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copy $splashImage, "/boot/background.png" or die "cannot copy $splashImage to /boot\n";
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$conf .= "
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insmod png
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if background_image " . $grubBoot->path . "/background.png; then
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set color_normal=white/black
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set color_highlight=black/white
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else
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set menu_color_normal=cyan/blue
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set menu_color_highlight=white/blue
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fi
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";
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}
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}
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$conf .= "$extraConfig\n";
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# Generate the menu entries.
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$conf .= "\n";
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my %copied;
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mkpath("/boot/kernels", 0, 0755) if $copyKernels;
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sub copyToKernelsDir {
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my ($path) = @_;
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return $grubStore->path . substr($path, length("/nix/store")) unless $copyKernels;
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$path =~ /\/nix\/store\/(.*)/ or die;
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my $name = $1; $name =~ s/\//-/g;
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my $dst = "/boot/kernels/$name";
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# Don't copy the file if $dst already exists. This means that we
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# have to create $dst atomically to prevent partially copied
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# kernels or initrd if this script is ever interrupted.
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if (! -e $dst) {
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my $tmp = "$dst.tmp";
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copy $path, $tmp or die "cannot copy $path to $tmp\n";
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rename $tmp, $dst or die "cannot rename $tmp to $dst\n";
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}
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$copied{$dst} = 1;
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return $grubBoot->path . "/kernels/$name";
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}
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sub addEntry {
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my ($name, $path) = @_;
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return unless -e "$path/kernel" && -e "$path/initrd";
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my $kernel = copyToKernelsDir(Cwd::abs_path("$path/kernel"));
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my $initrd = copyToKernelsDir(Cwd::abs_path("$path/initrd"));
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my $xen = -e "$path/xen.gz" ? copyToKernelsDir(Cwd::abs_path("$path/xen.gz")) : undef;
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# FIXME: $confName
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my $kernelParams =
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"systemConfig=" . Cwd::abs_path($path) . " " .
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"init=" . Cwd::abs_path("$path/init") . " " .
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readFile("$path/kernel-params");
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my $xenParams = $xen && -e "$path/xen-params" ? readFile("$path/xen-params") : "";
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if ($grubVersion == 1) {
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$conf .= "title $name\n";
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$conf .= " $extraPerEntryConfig\n" if $extraPerEntryConfig;
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$conf .= " kernel $xen $xenParams\n" if $xen;
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$conf .= " " . ($xen ? "module" : "kernel") . " $kernel $kernelParams\n";
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$conf .= " " . ($xen ? "module" : "initrd") . " $initrd\n\n";
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} else {
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$conf .= "menuentry \"$name\" {\n";
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$conf .= $grubBoot->search . "\n";
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if ($copyKernels == 0) {
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$conf .= $grubStore->search . "\n";
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}
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$conf .= " $extraPerEntryConfig\n" if $extraPerEntryConfig;
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$conf .= " multiboot $xen $xenParams\n" if $xen;
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$conf .= " " . ($xen ? "module" : "linux") . " $kernel $kernelParams\n";
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$conf .= " " . ($xen ? "module" : "initrd") . " $initrd\n";
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$conf .= "}\n\n";
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}
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}
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# Add default entries.
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$conf .= "$extraEntries\n" if $extraEntriesBeforeNixOS;
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addEntry("NixOS - Default", $defaultConfig);
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$conf .= "$extraEntries\n" unless $extraEntriesBeforeNixOS;
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# extraEntries could refer to @bootRoot@, which we have to substitute
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$conf =~ s/\@bootRoot\@/$grubBoot->path/g;
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# Emit submenus for all system profiles.
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sub addProfile {
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my ($profile, $description) = @_;
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# Add entries for all generations of this profile.
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$conf .= "submenu \"$description\" {\n" if $grubVersion == 2;
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sub nrFromGen { my ($x) = @_; $x =~ /\/\w+-(\d+)-link/; return $1; }
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my @links = sort
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{ nrFromGen($b) <=> nrFromGen($a) }
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(glob "$profile-*-link");
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my $curEntry = 0;
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foreach my $link (@links) {
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last if $curEntry++ >= $configurationLimit;
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my $date = strftime("%F", localtime(lstat($link)->mtime));
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my $version =
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-e "$link/nixos-version"
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? readFile("$link/nixos-version")
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: basename((glob(dirname(Cwd::abs_path("$link/kernel")) . "/lib/modules/*"))[0]);
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addEntry("NixOS - Configuration " . nrFromGen($link) . " ($date - $version)", $link);
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}
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$conf .= "}\n" if $grubVersion == 2;
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}
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addProfile "/nix/var/nix/profiles/system", "NixOS - All configurations";
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if ($grubVersion == 2) {
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for my $profile (glob "/nix/var/nix/profiles/system-profiles/*") {
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my $name = basename($profile);
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next unless $name =~ /^\w+$/;
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addProfile $profile, "NixOS - Profile '$name'";
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}
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}
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# Run extraPrepareConfig in sh
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if ($extraPrepareConfig ne "") {
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system((get("shell"), "-c", $extraPrepareConfig));
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}
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# Atomically update the GRUB config.
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my $confFile = $grubVersion == 1 ? "/boot/grub/menu.lst" : "/boot/grub/grub.cfg";
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my $tmpFile = $confFile . ".tmp";
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writeFile($tmpFile, $conf);
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rename $tmpFile, $confFile or die "cannot rename $tmpFile to $confFile\n";
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# Remove obsolete files from /boot/kernels.
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foreach my $fn (glob "/boot/kernels/*") {
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next if defined $copied{$fn};
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print STDERR "removing obsolete file $fn\n";
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unlink $fn;
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}
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# Install GRUB if the version changed from the last time we installed
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# it. FIXME: shouldn't we reinstall if ‘devices’ changed?
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my $prevVersion = readFile("/boot/grub/version") // "";
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if (($ENV{'NIXOS_INSTALL_GRUB'} // "") eq "1" || get("fullVersion") ne $prevVersion) {
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foreach my $dev ($dom->findnodes('/expr/attrs/attr[@name = "devices"]/list/string/@value')) {
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$dev = $dev->findvalue(".") or die;
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next if $dev eq "nodev";
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print STDERR "installing the GRUB $grubVersion boot loader on $dev...\n";
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system("$grub/sbin/grub-install", "--recheck", Cwd::abs_path($dev)) == 0
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or die "$0: installation of GRUB on $dev failed\n";
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}
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writeFile("/boot/grub/version", get("fullVersion"));
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}
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