mirror of
https://github.com/NixOS/nixpkgs.git
synced 2024-11-24 06:31:02 +00:00
7a7bf8368e
The host id value gets generated by reading a 32-bit value from /dev/urandom. This makes programs that rely on a correct host id more reliable. It also makes using ZFS more seamless, as you don't need to configure the hostId manually; instead, it becomes part of your config from the moment you install NixOS.
549 lines
15 KiB
Perl
549 lines
15 KiB
Perl
#! @perl@
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use Cwd 'abs_path';
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use File::Spec;
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use File::Path;
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use File::Basename;
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use File::Slurp;
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use File::stat;
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sub uniq {
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my %seen;
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my @res = ();
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foreach my $s (@_) {
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if (!defined $seen{$s}) {
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$seen{$s} = 1;
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push @res, $s;
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}
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}
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return @res;
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}
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sub runCommand {
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my ($cmd) = @_;
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open FILE, "$cmd 2>&1 |" 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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# Process the command line.
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my $outDir = "/etc/nixos";
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my $rootDir = ""; # = /
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my $force = 0;
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my $noFilesystems = 0;
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my $showHardwareConfig = 0;
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for (my $n = 0; $n < scalar @ARGV; $n++) {
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my $arg = $ARGV[$n];
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if ($arg eq "--help") {
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exec "man nixos-generate-config" or die;
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}
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elsif ($arg eq "--dir") {
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$n++;
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$outDir = $ARGV[$n];
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die "$0: ‘--dir’ requires an argument\n" unless defined $outDir;
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}
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elsif ($arg eq "--root") {
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$n++;
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$rootDir = $ARGV[$n];
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die "$0: ‘--root’ requires an argument\n" unless defined $rootDir;
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$rootDir =~ s/\/*$//; # remove trailing slashes
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}
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elsif ($arg eq "--force") {
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$force = 1;
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}
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elsif ($arg eq "--no-filesystems") {
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$noFilesystems = 1;
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}
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elsif ($arg eq "--show-hardware-config") {
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$showHardwareConfig = 1;
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}
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else {
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die "$0: unrecognized argument ‘$arg’\n";
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}
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}
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my @attrs = ();
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my @kernelModules = ();
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my @initrdKernelModules = ();
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my @modulePackages = ();
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my @imports = ("<nixpkgs/nixos/modules/installer/scan/not-detected.nix>");
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sub debug {
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return unless defined $ENV{"DEBUG"};
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print STDERR @_;
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}
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my $cpuinfo = read_file "/proc/cpuinfo";
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sub hasCPUFeature {
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my $feature = shift;
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return $cpuinfo =~ /^flags\s*:.* $feature( |$)/m;
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}
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# Detect the number of CPU cores.
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my $cpus = scalar (grep {/^processor\s*:/} (split '\n', $cpuinfo));
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# Virtualization support?
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push @kernelModules, "kvm-intel" if hasCPUFeature "vmx";
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push @kernelModules, "kvm-amd" if hasCPUFeature "svm";
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# Look at the PCI devices and add necessary modules. Note that most
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# modules are auto-detected so we don't need to list them here.
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# However, some are needed in the initrd to boot the system.
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my $videoDriver;
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sub pciCheck {
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my $path = shift;
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my $vendor = read_file "$path/vendor"; chomp $vendor;
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my $device = read_file "$path/device"; chomp $device;
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my $class = read_file "$path/class"; chomp $class;
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my $module;
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if (-e "$path/driver/module") {
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$module = basename `readlink -f $path/driver/module`;
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chomp $module;
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}
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debug "$path: $vendor $device $class";
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debug " $module" if defined $module;
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debug "\n";
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if (defined $module) {
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# See the bottom of http://pciids.sourceforge.net/pci.ids for
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# device classes.
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if (# Mass-storage controller. Definitely important.
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$class =~ /^0x01/ ||
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# Firewire controller. A disk might be attached.
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$class =~ /^0x0c00/ ||
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# USB controller. Needed if we want to use the
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# keyboard when things go wrong in the initrd.
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$class =~ /^0x0c03/
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)
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{
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push @initrdAvailableKernelModules, $module;
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}
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}
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# broadcom STA driver (wl.ko)
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# list taken from http://www.broadcom.com/docs/linux_sta/README.txt
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if ($vendor eq "0x14e4" &&
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($device eq "0x4311" || $device eq "0x4312" || $device eq "0x4313" ||
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$device eq "0x4315" || $device eq "0x4327" || $device eq "0x4328" ||
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$device eq "0x4329" || $device eq "0x432a" || $device eq "0x432b" ||
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$device eq "0x432c" || $device eq "0x432d" || $device eq "0x4353" ||
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$device eq "0x4357" || $device eq "0x4358" || $device eq "0x4359" ||
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$device eq "0x4331" || $device eq "0x43a0" || $device eq "0x43b1"
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) )
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{
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push @modulePackages, "config.boot.kernelPackages.broadcom_sta";
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push @kernelModules, "wl";
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}
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# Can't rely on $module here, since the module may not be loaded
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# due to missing firmware. Ideally we would check modules.pcimap
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# here.
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push @attrs, "networking.enableIntel2200BGFirmware = true;" if
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$vendor eq "0x8086" &&
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($device eq "0x1043" || $device eq "0x104f" || $device eq "0x4220" ||
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$device eq "0x4221" || $device eq "0x4223" || $device eq "0x4224");
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push @attrs, "networking.enableIntel3945ABGFirmware = true;" if
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$vendor eq "0x8086" &&
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($device eq "0x4229" || $device eq "0x4230" ||
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$device eq "0x4222" || $device eq "0x4227");
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# Assume that all NVIDIA cards are supported by the NVIDIA driver.
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# There may be exceptions (e.g. old cards).
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# FIXME: do we want to enable an unfree driver here?
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#$videoDriver = "nvidia" if $vendor eq "0x10de" && $class =~ /^0x03/;
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}
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foreach my $path (glob "/sys/bus/pci/devices/*") {
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pciCheck $path;
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}
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push @attrs, "services.xserver.videoDrivers = [ \"$videoDriver\" ];" if $videoDriver;
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# Idem for USB devices.
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sub usbCheck {
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my $path = shift;
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my $class = read_file "$path/bInterfaceClass"; chomp $class;
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my $subclass = read_file "$path/bInterfaceSubClass"; chomp $subclass;
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my $protocol = read_file "$path/bInterfaceProtocol"; chomp $protocol;
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my $module;
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if (-e "$path/driver/module") {
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$module = basename `readlink -f $path/driver/module`;
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chomp $module;
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}
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debug "$path: $class $subclass $protocol";
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debug " $module" if defined $module;
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debug "\n";
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if (defined $module) {
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if (# Mass-storage controller. Definitely important.
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$class eq "08" ||
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# Keyboard. Needed if we want to use the
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# keyboard when things go wrong in the initrd.
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($class eq "03" && $protocol eq "01")
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)
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{
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push @initrdAvailableKernelModules, $module;
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}
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}
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}
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foreach my $path (glob "/sys/bus/usb/devices/*") {
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if (-e "$path/bInterfaceClass") {
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usbCheck $path;
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}
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}
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# Add the modules for all block devices.
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foreach my $path (glob "/sys/class/block/*") {
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my $module;
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if (-e "$path/device/driver/module") {
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$module = basename `readlink -f $path/device/driver/module`;
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chomp $module;
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push @initrdAvailableKernelModules, $module;
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}
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}
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my $virt = `systemd-detect-virt`;
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chomp $virt;
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# Check if we're a VirtualBox guest. If so, enable the guest
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# additions.
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if ($virt eq "oracle") {
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push @attrs, "services.virtualbox.enable = true;"
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}
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# Likewise for QEMU.
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if ($virt eq "qemu" || $virt eq "kvm" || $virt eq "bochs") {
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push @imports, "<nixpkgs/nixos/modules/profiles/qemu-guest.nix>";
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}
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# For a device name like /dev/sda1, find a more stable path like
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# /dev/disk/by-uuid/X or /dev/disk/by-label/Y.
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sub findStableDevPath {
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my ($dev) = @_;
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return $dev if substr($dev, 0, 1) ne "/";
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return $dev unless -e $dev;
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my $st = stat($dev) or return $dev;
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foreach my $dev2 (glob("/dev/disk/by-uuid/*"), glob("/dev/mapper/*"), glob("/dev/disk/by-label/*")) {
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my $st2 = stat($dev2) or next;
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return $dev2 if $st->rdev == $st2->rdev;
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}
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return $dev;
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}
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# Generate the swapDevices option from the currently activated swap
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# devices.
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my @swaps = read_file("/proc/swaps");
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shift @swaps;
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my @swapDevices;
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foreach my $swap (@swaps) {
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$swap =~ /^(\S+)\s/;
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next unless -e $1;
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my $dev = findStableDevPath $1;
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push @swapDevices, "{ device = \"$dev\"; }";
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}
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# Generate the fileSystems option from the currently mounted
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# filesystems.
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sub in {
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my ($d1, $d2) = @_;
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return $d1 eq $d2 || substr($d1, 0, length($d2) + 1) eq "$d2/";
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}
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my $fileSystems;
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my %fsByDev;
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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 /,/, $fields[5];
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next if !in($mountPoint, $rootDir);
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$mountPoint = substr($mountPoint, length($rootDir)); # strip the root directory (e.g. /mnt)
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$mountPoint = "/" if $mountPoint eq "";
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# Skip special filesystems.
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next if in($mountPoint, "/proc") || in($mountPoint, "/dev") || in($mountPoint, "/sys") || in($mountPoint, "/run") || $mountPoint eq "/var/lib/nfs/rpc_pipefs";
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next if $mountPoint eq "/var/setuid-wrappers";
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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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# Maybe this is a bind-mount of a filesystem we saw earlier?
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if (defined $fsByDev{$fields[2]}) {
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# Make sure this isn't a btrfs subvolume
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my ($status, @msg) = runCommand("btrfs subvol show $rootDir$mountPoint");
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if (join("", @msg) =~ /ERROR:/) {
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my $path = $fields[3]; $path = "" if $path eq "/";
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my $base = $fsByDev{$fields[2]};
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$base = "" if $base eq "/";
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$fileSystems .= <<EOF;
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fileSystems.\"$mountPoint\" =
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{ device = \"$base$path\";
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fsType = \"none\";
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options = \"bind\";
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};
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EOF
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next;
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}
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}
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$fsByDev{$fields[2]} = $mountPoint;
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# We don't know how to handle FUSE filesystems.
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if ($fsType eq "fuseblk" || $fsType eq "fuse") {
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print STDERR "warning: don't know how to emit ‘fileSystem’ option for FUSE filesystem ‘$mountPoint’\n";
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next;
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}
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# Is this a mount of a loopback device?
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my @extraOptions;
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if ($device =~ /\/dev\/loop(\d+)/) {
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my $loopnr = $1;
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my $backer = read_file "/sys/block/loop$loopnr/loop/backing_file";
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if (defined $backer) {
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chomp $backer;
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$device = $backer;
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push @extraOptions, "loop";
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}
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}
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# Is this a btrfs filesystem?
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if ($fsType eq "btrfs") {
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my ($status, @id_info) = runCommand("btrfs subvol show $rootDir$mountPoint");
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if ($status != 0 || join("", @msg) =~ /ERROR:/) {
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die "Failed to retreive subvolume info for $mountPoint\n";
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}
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my @ids = join("", @id_info) =~ m/Object ID:[ \t\n]*([^ \t\n]*)/;
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if ($#ids > 0) {
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die "Btrfs subvol name for $mountPoint listed multiple times in mount\n"
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} elsif ($#ids == 0) {
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my ($status, @path_info) = runCommand("btrfs subvol list $rootDir$mountPoint");
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if ($status != 0) {
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die "Failed to find $mountPoint 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 $mountPoint\n";
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} elsif ($#paths != 0) {
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die "Btrfs did not return a path for the subvolume at $mountPoint\n";
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}
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push @extraOptions, "subvol=$paths[0]";
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}
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}
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# Emit the filesystem.
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$fileSystems .= <<EOF;
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fileSystems.\"$mountPoint\" =
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{ device = \"${\(findStableDevPath $device)}\";
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fsType = \"$fsType\";
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EOF
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if (scalar @extraOptions > 0) {
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$fileSystems .= <<EOF;
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options = \"${\join ",", uniq(@extraOptions)}\";
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EOF
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}
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$fileSystems .= <<EOF;
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};
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EOF
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}
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# Generate the hardware configuration file.
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sub toNixExpr {
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my $res = "";
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foreach my $s (@_) {
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$res .= " \"$s\"";
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}
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return $res;
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}
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sub multiLineList {
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my $indent = shift;
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return " [ ]" if !@_;
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$res = "\n${indent}[ ";
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my $first = 1;
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foreach my $s (@_) {
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$res .= "$indent " if !$first;
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$first = 0;
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$res .= "$s\n";
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}
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$res .= "$indent]";
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return $res;
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}
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my $initrdAvailableKernelModules = toNixExpr(uniq @initrdAvailableKernelModules);
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my $kernelModules = toNixExpr(uniq @kernelModules);
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my $modulePackages = toNixExpr(uniq @modulePackages);
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my $fsAndSwap = "";
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if (!$noFilesystems) {
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$fsAndSwap = "\n${fileSystems} ";
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$fsAndSwap .= "swapDevices =" . multiLineList(" ", @swapDevices) . ";\n";
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}
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my $hwConfig = <<EOF;
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# Do not modify this file! It was generated by ‘nixos-generate-config’
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# and may be overwritten by future invocations. Please make changes
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# to /etc/nixos/configuration.nix instead.
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{ config, pkgs, ... }:
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{
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imports =${\multiLineList(" ", @imports)};
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boot.initrd.availableKernelModules = [$initrdAvailableKernelModules ];
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boot.kernelModules = [$kernelModules ];
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boot.extraModulePackages = [$modulePackages ];
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$fsAndSwap
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nix.maxJobs = $cpus;
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${\join "", (map { " $_\n" } (uniq @attrs))}}
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EOF
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if ($showHardwareConfig) {
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print STDOUT $hwConfig;
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} else {
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$outDir = "$rootDir$outDir";
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my $fn = "$outDir/hardware-configuration.nix";
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print STDERR "writing $fn...\n";
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mkpath($outDir, 0, 0755);
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write_file($fn, $hwConfig);
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# Generate a basic configuration.nix, unless one already exists.
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$fn = "$outDir/configuration.nix";
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if ($force || ! -e $fn) {
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print STDERR "writing $fn...\n";
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my $bootloaderConfig;
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if (-e "/sys/firmware/efi/efivars") {
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$bootLoaderConfig = <<EOF;
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# Use the gummiboot efi boot loader.
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boot.loader.gummiboot.enable = true;
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boot.loader.efi.canTouchEfiVariables = true;
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EOF
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} else {
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$bootLoaderConfig = <<EOF;
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# Use the GRUB 2 boot loader.
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boot.loader.grub.enable = true;
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boot.loader.grub.version = 2;
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# Define on which hard drive you want to install Grub.
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# boot.loader.grub.device = "/dev/sda";
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EOF
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}
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# Generate a random 32-bit value to use as the host id
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open my $rnd, "<", "/dev/urandom" or die $!;
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read $rnd, $hostIdBin, 4;
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close $rnd;
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# Convert the 32-bit value to a hex string
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my $hostIdHex = unpack("H*", $hostIdBin);
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write_file($fn, <<EOF);
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# Edit this configuration file to define what should be installed on
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# your system. Help is available in the configuration.nix(5) man page
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# and in the NixOS manual (accessible by running ‘nixos-help’).
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{ config, pkgs, ... }:
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|
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{
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imports =
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[ # Include the results of the hardware scan.
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./hardware-configuration.nix
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];
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|
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$bootLoaderConfig
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# networking.hostName = "nixos"; # Define your hostname.
|
||
networking.hostId = "$hostIdHex";
|
||
# networking.wireless.enable = true; # Enables wireless.
|
||
|
||
# Select internationalisation properties.
|
||
# i18n = {
|
||
# consoleFont = "lat9w-16";
|
||
# consoleKeyMap = "us";
|
||
# defaultLocale = "en_US.UTF-8";
|
||
# };
|
||
|
||
# List packages installed in system profile. To search by name, run:
|
||
# \$ nix-env -qaP | grep wget
|
||
# environment.systemPackages = with pkgs; [
|
||
# wget
|
||
# ];
|
||
|
||
# List services that you want to enable:
|
||
|
||
# Enable the OpenSSH daemon.
|
||
# services.openssh.enable = true;
|
||
|
||
# Enable CUPS to print documents.
|
||
# services.printing.enable = true;
|
||
|
||
# Enable the X11 windowing system.
|
||
# services.xserver.enable = true;
|
||
# services.xserver.layout = "us";
|
||
# services.xserver.xkbOptions = "eurosign:e";
|
||
|
||
# Enable the KDE Desktop Environment.
|
||
# services.xserver.displayManager.kdm.enable = true;
|
||
# services.xserver.desktopManager.kde4.enable = true;
|
||
|
||
# Define a user account. Don't forget to set a password with ‘passwd’.
|
||
# users.extraUsers.guest = {
|
||
# isNormalUser = true;
|
||
# uid = 1000;
|
||
# };
|
||
|
||
}
|
||
EOF
|
||
} else {
|
||
print STDERR "warning: not overwriting existing $fn\n";
|
||
}
|
||
}
|
||
|
||
# workaround for a bug in substituteAll
|