mirror of
https://github.com/NixOS/nixpkgs.git
synced 2024-12-25 03:17:13 +00:00
275 lines
7 KiB
Perl
275 lines
7 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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# Process the command line.
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my $outDir = "/etc/nixos";
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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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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 = ("<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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# Read a file, returning undef if the file cannot be opened.
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sub readFile {
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my $filename = shift;
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my $res;
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if (open FILE, "<$filename") {
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my $prev = $/;
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undef $/;
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$res = <FILE>;
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$/ = $prev;
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close FILE;
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chomp $res;
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}
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return $res;
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}
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my $cpuinfo = readFile "/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 $vendor = readFile "$path/vendor";
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my $device = readFile "$path/device";
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my $class = readFile "$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 @initrdKernelModules, $module;
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}
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}
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# broadcom STA driver (wl.ko)
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# list taken from http://www.broadcom.com/docs/linux_sta/README.txt
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if ($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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# Idem for USB devices.
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sub usbCheck {
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my $path = shift;
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my $class = readFile "$path/bInterfaceClass";
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my $subclass = readFile "$path/bInterfaceSubClass";
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my $protocol = readFile "$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 @initrdKernelModules, $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 @initrdKernelModules, $module;
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}
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}
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if ($videoDriver) {
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push @attrs, "services.xserver.videoDrivers = [ \"$videoDriver\" ];";
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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 hardware configuration file.
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sub removeDups {
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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} = "";
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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 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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my $res = "";
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$res = "\n" if scalar @_ > 0;
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foreach my $s (@_) {
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$res .= "$indent$s\n";
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}
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return $res;
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}
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my $initrdKernelModules = toNixExpr(removeDups @initrdKernelModules);
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my $kernelModules = toNixExpr(removeDups @kernelModules);
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my $modulePackages = toNixExpr(removeDups @modulePackages);
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my $attrs = multiLineList(" ", removeDups @attrs);
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my $imports = multiLineList(" ", removeDups @imports);
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my $fn = "$outDir/hardware.nix";
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print STDERR "writing $fn...\n";
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mkpath($outDir, 0, 0755);
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write_file($fn, <<EOF);
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# Do not modify this file! It was generated by ‘nixos-generate-config’
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# and may be overwritten by future invocations. Please make changes
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# to /etc/nixos/configuration.nix instead.
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{ config, pkgs, ... }:
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{
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imports = [$imports ];
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boot.initrd.kernelModules = [$initrdKernelModules ];
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boot.kernelModules = [$kernelModules ];
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boot.extraModulePackages = [$modulePackages ];
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nix.maxJobs = $cpus;
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$attrs}
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EOF
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# workaround for a bug in substituteAll
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