600 lines
20 KiB
Perl
600 lines
20 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 File::Temp;
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require List::Compare;
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use POSIX;
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use Cwd;
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# system.build.toplevel path
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my $defaultConfig = $ARGV[1] or die;
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# Grub config XML generated by grubConfig function in grub.nix
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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 $grubTarget = get("grubTarget");
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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 $extraInitrd = get("extraInitrd");
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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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my $grubEfi = get("grubEfi");
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my $grubTargetEfi = get("grubTargetEfi");
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my $bootPath = get("bootPath");
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my $storePath = get("storePath");
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my $canTouchEfiVariables = get("canTouchEfiVariables");
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my $efiInstallAsRemovable = get("efiInstallAsRemovable");
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my $efiSysMountPoint = get("efiSysMountPoint");
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my $gfxmodeEfi = get("gfxmodeEfi");
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my $gfxmodeBios = get("gfxmodeBios");
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my $bootloaderId = get("bootloaderId");
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my $forceInstall = get("forceInstall");
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my $font = get("font");
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$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 $grubVersion menu...\n";
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mkpath("$bootPath/grub", 0, 0700);
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# Discover whether the bootPath 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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# the bootPath.
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if (stat($bootPath)->dev != stat("/nix/store")->dev) {
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$copyKernels = 1;
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}
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# Discover information about the location of the bootPath
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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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# Figure out what filesystem is used for the directory with init/initrd/kernel files
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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 bind-mount on /nix/store.
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next if $mountPoint eq "/nix/store" && (grep { $_ eq "rw" } @superOptions);
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# Skip mount point generated by systemd-efi-boot-generator?
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next if $fsType eq "autofs";
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# Ensure this matches the intended directory
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next unless PathInMount($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($fs->mount));
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if (substr($path, 0, 1) ne "/") {
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$path = "/$path";
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}
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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 ($status, @devInfo) = runCommand("@utillinux@/bin/blkid -o export @{[$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 ($status, @id_info) = runCommand("@btrfsprogs@/bin/btrfs subvol show @{[$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/Subvolume 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("@btrfsprogs@/bin/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 $grubBoot = GrubFs($bootPath);
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my $grubStore;
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if ($copyKernels == 0) {
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$grubStore = GrubFs($storePath);
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}
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my $extraInitrdPath;
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if ($extraInitrd) {
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if (! -f $extraInitrd) {
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print STDERR "Warning: the specified extraInitrd " . $extraInitrd . " doesn't exist. Your system won't boot without it.\n";
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}
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$extraInitrdPath = GrubFs($extraInitrd);
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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 $splashImage, "$bootPath/background.xpm.gz" or die "cannot copy $splashImage to $bootPath\n";
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$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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" . $grubStore->search;
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}
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# FIXME: should use grub-mkconfig.
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$conf .= "
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" . $grubBoot->search . "
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if [ -s \$prefix/grubenv ]; then
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load_env
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fi
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# ‘grub-reboot’ sets a one-time saved entry, which we process here and
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# then delete.
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if [ \"\${next_entry}\" ]; then
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set default=\"\${next_entry}\"
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set next_entry=
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save_env next_entry
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set timeout=1
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else
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set default=$defaultEntry
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set timeout=$timeout
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fi
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# Setup the graphics stack for bios and efi systems
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if [ \"\${grub_platform}\" = \"efi\" ]; then
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insmod efi_gop
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insmod efi_uga
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else
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insmod vbe
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fi
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insmod font
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if loadfont " . $grubBoot->path . "/converted-font.pf2; then
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insmod gfxterm
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if [ \"\${grub_platform}\" = \"efi\" ]; then
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set gfxmode=$gfxmodeEfi
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set gfxpayload=keep
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else
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set gfxmode=$gfxmodeBios
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set gfxpayload=text
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fi
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terminal_output gfxterm
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fi
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";
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if ($font) {
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copy $font, "$bootPath/converted-font.pf2" or die "cannot copy $font to $bootPath\n";
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}
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if ($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 $splashImage, "$bootPath/background.png" or die "cannot copy $splashImage to $bootPath\n";
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$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("$bootPath/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 $dst = "$bootPath/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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if ($extraInitrd) {
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$initrd .= " " .$extraInitrdPath->path;
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}
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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 .= $grubStore->search . "\n";
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}
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if ($extraInitrd) {
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$conf .= $extraInitrdPath->search . "\n";
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}
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$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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my $grubBootPath = $grubBoot->path;
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# extraEntries could refer to @bootRoot@, which we have to substitute
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$conf =~ s/\@bootRoot\@/$grubBootPath/g;
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# Emit submenus for all system profiles.
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sub addProfile {
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my ($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++ >= $configurationLimit;
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if (! -e "$link/nixos-version") {
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warn "skipping corrupt system profile entry ‘$link’\n";
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next;
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}
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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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# write the GRUB config.
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my $confFile = $grubVersion == 1 ? "$bootPath/grub/menu.lst" : "$bootPath/grub/grub.cfg";
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my $tmpFile = $confFile . ".tmp";
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writeFile($tmpFile, $conf);
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# check whether to install GRUB EFI or not
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sub getEfiTarget {
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if ($grubVersion == 1) {
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return "no"
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} elsif (($grub ne "") && ($grubEfi ne "")) {
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# EFI can only be installed when target is set;
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# A target is also required then for non-EFI grub
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if (($grubTarget eq "") || ($grubTargetEfi eq "")) { die }
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else { return "both" }
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} elsif (($grub ne "") && ($grubEfi eq "")) {
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# TODO: It would be safer to disallow non-EFI grub installation if no taget is given.
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# If no target is given, then grub auto-detects the target which can lead to errors.
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# E.g. it seems as if grub would auto-detect a EFI target based on the availability
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# of a EFI partition.
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# However, it seems as auto-detection is currently relied on for non-x86_64 and non-i386
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# architectures in NixOS. That would have to be fixed in the nixos modules first.
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return "no"
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} elsif (($grub eq "") && ($grubEfi ne "")) {
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# EFI can only be installed when target is set;
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if ($grubTargetEfi eq "") { die }
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||
else {return "only" }
|
||
} else {
|
||
# prevent an installation if neither grub nor grubEfi is given
|
||
return "neither"
|
||
}
|
||
}
|
||
|
||
my $efiTarget = getEfiTarget();
|
||
|
||
# Append entries detected by os-prober
|
||
if (get("useOSProber") eq "true") {
|
||
my $targetpackage = ($efiTarget eq "no") ? $grub : $grubEfi;
|
||
system(get("shell"), "-c", "pkgdatadir=$targetpackage/share/grub $targetpackage/etc/grub.d/30_os-prober >> $tmpFile");
|
||
}
|
||
|
||
# Atomically switch to the new config
|
||
rename $tmpFile, $confFile or die "cannot rename $tmpFile to $confFile\n";
|
||
|
||
|
||
# Remove obsolete files from $bootPath/kernels.
|
||
foreach my $fn (glob "$bootPath/kernels/*") {
|
||
next if defined $copied{$fn};
|
||
print STDERR "removing obsolete file $fn\n";
|
||
unlink $fn;
|
||
}
|
||
|
||
|
||
#
|
||
# Install GRUB if the parameters changed from the last time we installed it.
|
||
#
|
||
|
||
struct(GrubState => {
|
||
name => '$',
|
||
version => '$',
|
||
efi => '$',
|
||
devices => '$',
|
||
efiMountPoint => '$',
|
||
});
|
||
sub readGrubState {
|
||
my $defaultGrubState = GrubState->new(name => "", version => "", efi => "", devices => "", efiMountPoint => "" );
|
||
open FILE, "<$bootPath/grub/state" or return $defaultGrubState;
|
||
local $/ = "\n";
|
||
my $name = <FILE>;
|
||
chomp($name);
|
||
my $version = <FILE>;
|
||
chomp($version);
|
||
my $efi = <FILE>;
|
||
chomp($efi);
|
||
my $devices = <FILE>;
|
||
chomp($devices);
|
||
my $efiMountPoint = <FILE>;
|
||
chomp($efiMountPoint);
|
||
close FILE;
|
||
my $grubState = GrubState->new(name => $name, version => $version, efi => $efi, devices => $devices, efiMountPoint => $efiMountPoint );
|
||
return $grubState
|
||
}
|
||
|
||
sub getDeviceTargets {
|
||
my @devices = ();
|
||
foreach my $dev ($dom->findnodes('/expr/attrs/attr[@name = "devices"]/list/string/@value')) {
|
||
$dev = $dev->findvalue(".") or die;
|
||
push(@devices, $dev);
|
||
}
|
||
return @devices;
|
||
}
|
||
my @deviceTargets = getDeviceTargets();
|
||
my $prevGrubState = readGrubState();
|
||
my @prevDeviceTargets = split/,/, $prevGrubState->devices;
|
||
|
||
my $devicesDiffer = scalar (List::Compare->new( '-u', '-a', \@deviceTargets, \@prevDeviceTargets)->get_symmetric_difference());
|
||
my $nameDiffer = get("fullName") ne $prevGrubState->name;
|
||
my $versionDiffer = get("fullVersion") ne $prevGrubState->version;
|
||
my $efiDiffer = $efiTarget ne $prevGrubState->efi;
|
||
my $efiMountPointDiffer = $efiSysMountPoint ne $prevGrubState->efiMountPoint;
|
||
if (($ENV{'NIXOS_INSTALL_GRUB'} // "") eq "1") {
|
||
warn "NIXOS_INSTALL_GRUB env var deprecated, use NIXOS_INSTALL_BOOTLOADER";
|
||
$ENV{'NIXOS_INSTALL_BOOTLOADER'} = "1";
|
||
}
|
||
my $requireNewInstall = $devicesDiffer || $nameDiffer || $versionDiffer || $efiDiffer || $efiMountPointDiffer || (($ENV{'NIXOS_INSTALL_BOOTLOADER'} // "") eq "1");
|
||
|
||
# install a symlink so that grub can detect the boot drive
|
||
my $tmpDir = File::Temp::tempdir(CLEANUP => 1) or die "Failed to create temporary space";
|
||
symlink "$bootPath", "$tmpDir/boot" or die "Failed to symlink $tmpDir/boot";
|
||
|
||
# install non-EFI GRUB
|
||
if (($requireNewInstall != 0) && ($efiTarget eq "no" || $efiTarget eq "both")) {
|
||
foreach my $dev (@deviceTargets) {
|
||
next if $dev eq "nodev";
|
||
print STDERR "installing the GRUB $grubVersion boot loader on $dev...\n";
|
||
my @command = ("$grub/sbin/grub-install", "--recheck", "--root-directory=$tmpDir", Cwd::abs_path($dev));
|
||
if ($forceInstall eq "true") {
|
||
push @command, "--force";
|
||
}
|
||
if ($grubTarget ne "") {
|
||
push @command, "--target=$grubTarget";
|
||
}
|
||
(system @command) == 0 or die "$0: installation of GRUB on $dev failed\n";
|
||
}
|
||
}
|
||
|
||
|
||
# install EFI GRUB
|
||
if (($requireNewInstall != 0) && ($efiTarget eq "only" || $efiTarget eq "both")) {
|
||
print STDERR "installing the GRUB $grubVersion EFI boot loader into $efiSysMountPoint...\n";
|
||
my @command = ("$grubEfi/sbin/grub-install", "--recheck", "--target=$grubTargetEfi", "--boot-directory=$bootPath", "--efi-directory=$efiSysMountPoint");
|
||
if ($forceInstall eq "true") {
|
||
push @command, "--force";
|
||
}
|
||
if ($canTouchEfiVariables eq "true") {
|
||
push @command, "--bootloader-id=$bootloaderId";
|
||
} else {
|
||
push @command, "--no-nvram";
|
||
push @command, "--removable" if $efiInstallAsRemovable eq "true";
|
||
}
|
||
|
||
(system @command) == 0 or die "$0: installation of GRUB EFI into $efiSysMountPoint failed\n";
|
||
}
|
||
|
||
|
||
# update GRUB state file
|
||
if ($requireNewInstall != 0) {
|
||
open FILE, ">$bootPath/grub/state" or die "cannot create $bootPath/grub/state: $!\n";
|
||
print FILE get("fullName"), "\n" or die;
|
||
print FILE get("fullVersion"), "\n" or die;
|
||
print FILE $efiTarget, "\n" or die;
|
||
print FILE join( ",", @deviceTargets ), "\n" or die;
|
||
print FILE $efiSysMountPoint, "\n" or die;
|
||
close FILE or die;
|
||
}
|