mirror of
https://github.com/NixOS/nixpkgs.git
synced 2024-12-25 03:17:13 +00:00
a146fdab80
We don't want to hardcode configuration options that the current kernel chose for us when mounting the filesystem, since the defaults can change in the future.
456 lines
12 KiB
Perl
456 lines
12 KiB
Perl
#! @perl@
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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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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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# 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";
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my $device = read_file "$path/device";
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my $class = read_file "$path/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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{
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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" || $device eq "0x4227");
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# Assume that all NVIDIA cards are supported by the NVIDIA driver.
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# There may be exceptions (e.g. old cards).
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$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 $path;
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}
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push @attrs, "hardware.opengl.videoDrivers = [ \"$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";
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my $subclass = read_file "$path/bInterfaceSubClass";
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my $protocol = read_file "$path/bInterfaceProtocol";
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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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# Check if we're a VirtualBox guest. If so, enable the guest
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# additions.
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my $dmi = `@dmidecode@/sbin/dmidecode`;
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if ($dmi =~ /Manufacturer: innotek/) {
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push @attrs, "services.virtualbox.enable = true;"
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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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push @swapDevices, "{ device = \"$1\"; }";
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}
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# Generate the fileSystems option from the currently mounted
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# filesystems.
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sub in {
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my ($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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# 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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my $path = $fields[3]; $path = "" if $path eq "/";
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$fileSystems .= <<EOF;
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fileSystems.\"$mountPoint\" =
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{ device = \"$fsByDev{$fields[2]}$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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$fsByDev{$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 = $backer;
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push @extraOptions, "loop";
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}
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}
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# Emit the filesystem.
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$fileSystems .= <<EOF;
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fileSystems.\"$mountPoint\" =
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{ device = \"$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.grub.enable = false;
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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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$bootLoaderConfig = <<EOF;
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# Use the GRUB 2 boot loader.
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boot.loader.grub.enable = true;
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boot.loader.grub.version = 2;
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# Define on which hard drive you want to install Grub.
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# boot.loader.grub.device = "/dev/sda";
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EOF
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}
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write_file($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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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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$bootLoaderConfig
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# networking.hostName = "nixos"; # Define your hostname.
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# networking.wireless.enable = true; # Enables wireless.
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# Select internationalisation properties.
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# i18n = {
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# consoleFont = "lat9w-16";
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# consoleKeyMap = "us";
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# defaultLocale = "en_US.UTF-8";
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# };
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# List services that you want to enable:
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# Enable the OpenSSH daemon.
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# services.openssh.enable = true;
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# Enable CUPS to print documents.
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# services.printing.enable = true;
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# Enable the X11 windowing system.
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# services.xserver.enable = true;
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# services.xserver.layout = "us";
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# services.xserver.xkbOptions = "eurosign:e";
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# Enable the KDE Desktop Environment.
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# services.xserver.displayManager.kdm.enable = true;
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# services.xserver.desktopManager.kde4.enable = true;
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}
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EOF
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} else {
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print STDERR "warning: not overwriting existing $fn\n";
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}
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}
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# workaround for a bug in substituteAll
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