diff options
Diffstat (limited to 'nixos/modules/installer/tools/nixos-generate-config.pl')
| -rw-r--r-- | nixos/modules/installer/tools/nixos-generate-config.pl | 450 |
1 files changed, 450 insertions, 0 deletions
diff --git a/nixos/modules/installer/tools/nixos-generate-config.pl b/nixos/modules/installer/tools/nixos-generate-config.pl new file mode 100644 index 000000000000..0f9142990ec1 --- /dev/null +++ b/nixos/modules/installer/tools/nixos-generate-config.pl @@ -0,0 +1,450 @@ +#! @perl@ + +use File::Spec; +use File::Path; +use File::Basename; +use File::Slurp; + + +sub uniq { + my %seen; + my @res = (); + foreach my $s (@_) { + if (!defined $seen{$s}) { + $seen{$s} = 1; + push @res, $s; + } + } + return @res; +} + + +# Process the command line. +my $outDir = "/etc/nixos"; +my $rootDir = ""; # = / +my $force = 0; +my $noFilesystems = 0; +my $showHardwareConfig = 0; + +for (my $n = 0; $n < scalar @ARGV; $n++) { + my $arg = $ARGV[$n]; + if ($arg eq "--help") { + exec "man nixos-generate-config" or die; + } + elsif ($arg eq "--dir") { + $n++; + $outDir = $ARGV[$n]; + die "$0: ‘--dir’ requires an argument\n" unless defined $outDir; + } + elsif ($arg eq "--root") { + $n++; + $rootDir = $ARGV[$n]; + die "$0: ‘--root’ requires an argument\n" unless defined $rootDir; + $rootDir =~ s/\/*$//; # remove trailing slashes + } + elsif ($arg eq "--force") { + $force = 1; + } + elsif ($arg eq "--no-filesystems") { + $noFilesystems = 1; + } + elsif ($arg eq "--show-hardware-config") { + $showHardwareConfig = 1; + } + else { + die "$0: unrecognized argument ‘$arg’\n"; + } +} + + +my @attrs = (); +my @kernelModules = (); +my @initrdKernelModules = (); +my @modulePackages = (); +my @imports = ("<nixos/modules/installer/scan/not-detected.nix>"); + + +sub debug { + return unless defined $ENV{"DEBUG"}; + print STDERR @_; +} + + +my $cpuinfo = read_file "/proc/cpuinfo"; + + +sub hasCPUFeature { + my $feature = shift; + return $cpuinfo =~ /^flags\s*:.* $feature( |$)/m; +} + + +# Detect the number of CPU cores. +my $cpus = scalar (grep {/^processor\s*:/} (split '\n', $cpuinfo)); + + +# Virtualization support? +push @kernelModules, "kvm-intel" if hasCPUFeature "vmx"; +push @kernelModules, "kvm-amd" if hasCPUFeature "svm"; + + +# Look at the PCI devices and add necessary modules. Note that most +# modules are auto-detected so we don't need to list them here. +# However, some are needed in the initrd to boot the system. + +my $videoDriver; + +sub pciCheck { + my $path = shift; + my $vendor = read_file "$path/vendor"; + my $device = read_file "$path/device"; + my $class = read_file "$path/class"; + + my $module; + if (-e "$path/driver/module") { + $module = basename `readlink -f $path/driver/module`; + chomp $module; + } + + debug "$path: $vendor $device $class"; + debug " $module" if defined $module; + debug "\n"; + + if (defined $module) { + # See the bottom of http://pciids.sourceforge.net/pci.ids for + # device classes. + if (# Mass-storage controller. Definitely important. + $class =~ /^0x01/ || + + # Firewire controller. A disk might be attached. + $class =~ /^0x0c00/ || + + # USB controller. Needed if we want to use the + # keyboard when things go wrong in the initrd. + $class =~ /^0x0c03/ + ) + { + push @initrdAvailableKernelModules, $module; + } + } + + # broadcom STA driver (wl.ko) + # list taken from http://www.broadcom.com/docs/linux_sta/README.txt + if ($vendor eq "0x14e4" && + ($device eq "0x4311" || $device eq "0x4312" || $device eq "0x4313" || + $device eq "0x4315" || $device eq "0x4327" || $device eq "0x4328" || + $device eq "0x4329" || $device eq "0x432a" || $device eq "0x432b" || + $device eq "0x432c" || $device eq "0x432d" || $device eq "0x4353" || + $device eq "0x4357" || $device eq "0x4358" || $device eq "0x4359" ) ) + { + push @modulePackages, "config.boot.kernelPackages.broadcom_sta"; + push @kernelModules, "wl"; + } + + # Can't rely on $module here, since the module may not be loaded + # due to missing firmware. Ideally we would check modules.pcimap + # here. + push @attrs, "networking.enableIntel2200BGFirmware = true;" if + $vendor eq "0x8086" && + ($device eq "0x1043" || $device eq "0x104f" || $device eq "0x4220" || + $device eq "0x4221" || $device eq "0x4223" || $device eq "0x4224"); + + push @attrs, "networking.enableIntel3945ABGFirmware = true;" if + $vendor eq "0x8086" && + ($device eq "0x4229" || $device eq "0x4230" || + $device eq "0x4222" || $device eq "0x4227"); + + # Assume that all NVIDIA cards are supported by the NVIDIA driver. + # There may be exceptions (e.g. old cards). + $videoDriver = "nvidia" if $vendor eq "0x10de" && $class =~ /^0x03/; +} + +foreach my $path (glob "/sys/bus/pci/devices/*") { + pciCheck $path; +} + +push @attrs, "services.xserver.videoDrivers = [ \"$videoDriver\" ];" if $videoDriver; + + +# Idem for USB devices. + +sub usbCheck { + my $path = shift; + my $class = read_file "$path/bInterfaceClass"; + my $subclass = read_file "$path/bInterfaceSubClass"; + my $protocol = read_file "$path/bInterfaceProtocol"; + + my $module; + if (-e "$path/driver/module") { + $module = basename `readlink -f $path/driver/module`; + chomp $module; + } + + debug "$path: $class $subclass $protocol"; + debug " $module" if defined $module; + debug "\n"; + + if (defined $module) { + if (# Mass-storage controller. Definitely important. + $class eq "08" || + + # Keyboard. Needed if we want to use the + # keyboard when things go wrong in the initrd. + ($class eq "03" && $protocol eq "01") + ) + { + push @initrdAvailableKernelModules, $module; + } + } +} + +foreach my $path (glob "/sys/bus/usb/devices/*") { + if (-e "$path/bInterfaceClass") { + usbCheck $path; + } +} + + +# Add the modules for all block devices. +foreach my $path (glob "/sys/class/block/*") { + my $module; + if (-e "$path/device/driver/module") { + $module = basename `readlink -f $path/device/driver/module`; + chomp $module; + push @initrdAvailableKernelModules, $module; + } +} + + +# Check if we're a VirtualBox guest. If so, enable the guest +# additions. +my $dmi = `@dmidecode@/sbin/dmidecode`; +if ($dmi =~ /Manufacturer: innotek/) { + push @attrs, "services.virtualbox.enable = true;" +} + + +# Generate the swapDevices option from the currently activated swap +# devices. +my @swaps = read_file("/proc/swaps"); +shift @swaps; +my @swapDevices; +foreach my $swap (@swaps) { + $swap =~ /^(\S+)\s/; + push @swapDevices, "{ device = \"$1\"; }"; +} + + +# Generate the fileSystems option from the currently mounted +# filesystems. +sub in { + my ($d1, $d2) = @_; + return $d1 eq $d2 || substr($d1, 0, length($d2) + 1) eq "$d2/"; +} + +my $fileSystems; +my %fsByDev; +foreach my $fs (read_file("/proc/self/mountinfo")) { + chomp $fs; + my @fields = split / /, $fs; + my $mountPoint = $fields[4]; + next unless -d $mountPoint; + my @mountOptions = split /,/, $fields[5]; + + next if !in($mountPoint, $rootDir); + $mountPoint = substr($mountPoint, length($rootDir)); # strip the root directory (e.g. /mnt) + $mountPoint = "/" if $mountPoint eq ""; + + # Skip special filesystems. + next if in($mountPoint, "/proc") || in($mountPoint, "/dev") || in($mountPoint, "/sys") || in($mountPoint, "/run"); + + # Skip the optional fields. + my $n = 6; $n++ while $fields[$n] ne "-"; $n++; + my $fsType = $fields[$n]; + my $device = $fields[$n + 1]; + my @superOptions = split /,/, $fields[$n + 2]; + + # Skip the read-only bind-mount on /nix/store. + next if $mountPoint eq "/nix/store" && (grep { $_ eq "rw" } @superOptions) && (grep { $_ eq "ro" } @mountOptions); + + # Maybe this is a bind-mount of a filesystem we saw earlier? + if (defined $fsByDev{$fields[2]}) { + my $path = $fields[3]; $path = "" if $path eq "/"; + $fileSystems .= <<EOF; + fileSystems.\"$mountPoint\" = + { device = \"$fsByDev{$fields[2]}$path\"; + fsType = \"none\"; + options = \"bind\"; + }; + +EOF + next; + } + $fsByDev{$fields[2]} = $mountPoint; + + # We don't know how to handle FUSE filesystems. + if ($fsType eq "fuseblk" || $fsType eq "fuse") { + print STDERR "warning: don't know how to emit ‘fileSystem’ option for FUSE filesystem ‘$mountPoint’\n"; + next; + } + + # Is this a mount of a loopback device? + my @extraOptions; + if ($device =~ /\/dev\/loop(\d+)/) { + my $loopnr = $1; + my $backer = read_file "/sys/block/loop$loopnr/loop/backing_file"; + if (defined $backer) { + chomp $backer; + $device = $backer; + push @extraOptions, "loop"; + } + } + + # Emit the filesystem. + $fileSystems .= <<EOF; + fileSystems.\"$mountPoint\" = + { device = \"$device\"; + fsType = \"$fsType\"; + options = \"${\join ",", uniq(@extraOptions, @superOptions, @mountOptions)}\"; + }; + +EOF +} + + +# Generate the hardware configuration file. + +sub toNixExpr { + my $res = ""; + foreach my $s (@_) { + $res .= " \"$s\""; + } + return $res; +} + +sub multiLineList { + my $indent = shift; + return "[ ]" if !@_; + $res = "\n${indent}[ "; + my $first = 1; + foreach my $s (@_) { + $res .= "$indent " if !$first; + $first = 0; + $res .= "$s\n"; + } + $res .= "$indent]"; + return $res; +} + +my $initrdAvailableKernelModules = toNixExpr(uniq @initrdAvailableKernelModules); +my $kernelModules = toNixExpr(uniq @kernelModules); +my $modulePackages = toNixExpr(uniq @modulePackages); + +my $fsAndSwap = ""; +if (!$noFilesystems) { + $fsAndSwap = "\n${fileSystems} "; + $fsAndSwap .= "swapDevices =" . multiLineList(" ", @swapDevices) . ";\n"; +} + +my $hwConfig = <<EOF; +# Do not modify this file! It was generated by ‘nixos-generate-config’ +# and may be overwritten by future invocations. Please make changes +# to /etc/nixos/configuration.nix instead. +{ config, pkgs, ... }: + +{ + imports =${\multiLineList(" ", @imports)}; + + boot.initrd.availableKernelModules = [$initrdAvailableKernelModules ]; + boot.kernelModules = [$kernelModules ]; + boot.extraModulePackages = [$modulePackages ]; +$fsAndSwap + nix.maxJobs = $cpus; +${\join "", (map { " $_\n" } (uniq @attrs))}} +EOF + + +if ($showHardwareConfig) { + print STDOUT $hwConfig; +} else { + $outDir = "$rootDir$outDir"; + + my $fn = "$outDir/hardware-configuration.nix"; + print STDERR "writing $fn...\n"; + mkpath($outDir, 0, 0755); + write_file($fn, $hwConfig); + + # Generate a basic configuration.nix, unless one already exists. + $fn = "$outDir/configuration.nix"; + if ($force || ! -e $fn) { + print STDERR "writing $fn...\n"; + + my $bootloaderConfig; + if (-e "/sys/firmware/efi/efivars") { + $bootLoaderConfig = <<EOF; + # Use the gummiboot efi boot loader. + boot.loader.grub.enable = false; + boot.loader.gummiboot.enable = true; + boot.loader.efi.canTouchEfiVariables = true; + # !!! Remove this when nixos is on 3.10 or greater by default + # EFI booting requires kernel >= 3.10 + boot.kernelPackages = pkgs.linuxPackages_3_10; +EOF + } else { + $bootLoaderConfig = <<EOF; + # Use the GRUB 2 boot loader. + boot.loader.grub.enable = true; + boot.loader.grub.version = 2; + # Define on which hard drive you want to install Grub. + # boot.loader.grub.device = "/dev/sda"; +EOF + } + + write_file($fn, <<EOF); +# Edit this configuration file to define what should be installed on +# your system. Help is available in the configuration.nix(5) man page +# and in the NixOS manual (accessible by running ‘nixos-help’). + +{ config, pkgs, ... }: + +{ + imports = + [ # Include the results of the hardware scan. + ./hardware-configuration.nix + ]; + +$bootLoaderConfig + # networking.hostName = "nixos"; # Define your hostname. + # networking.wireless.enable = true; # Enables wireless. + + # Select internationalisation properties. + # i18n = { + # consoleFont = "lat9w-16"; + # consoleKeyMap = "us"; + # defaultLocale = "en_US.UTF-8"; + # }; + + # 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; +} +EOF + } else { + print STDERR "warning: not overwriting existing $fn\n"; + } +} + +# workaround for a bug in substituteAll |