251 lines
8 KiB
Perl
251 lines
8 KiB
Perl
use strict;
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use warnings;
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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 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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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 $defaultEntry = int(get("default"));
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$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 $grubVersion menu...\n";
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mkpath("/boot/grub", 0, 0700);
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# Discover whether /boot is on the same filesystem as / and
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# /nix/store. If not, then all kernels and initrds must be copied to
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# /boot, and all paths in the GRUB config file must be relative to the
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# root of the /boot filesystem. `$bootRoot' is the path to be
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# prepended to paths under /boot.
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my $bootRoot = "/boot";
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if (stat("/")->dev != stat("/boot")->dev) {
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$bootRoot = "";
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$copyKernels = 1;
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} elsif (stat("/boot")->dev != stat("/nix/store")->dev) {
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$copyKernels = 1;
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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 $bootRoot/background.xpm.gz\n";
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}
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}
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else {
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$conf .= "
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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 $bootRoot/grub/fonts/unicode.pf2; then
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set gfxmode=640x480
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insmod gfxterm
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insmod vbe
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terminal_output gfxterm
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fi
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";
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if ($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 $bootRoot/background.png; then
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set color_normal=white/black
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set color_highlight=black/white
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else
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set menu_color_normal=cyan/blue
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set menu_color_highlight=white/blue
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fi
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";
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}
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}
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$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 $path 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{$dst} = 1;
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return "$bootRoot/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 .= " $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\@/$bootRoot/g;
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# Add entries for all previous generations of the system profile.
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$conf .= "submenu \"NixOS - Old configurations\" {\n" if $grubVersion == 2;
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sub nrFromGen { my ($x) = @_; $x =~ /system-(.*)-link/; return $1; }
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my @links = sort
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{ nrFromGen($b) <=> nrFromGen($a) }
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(glob "/nix/var/nix/profiles/system-*-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 $grubVersion == 2;
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# Run extraPrepareConfig in sh
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if ($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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