640 lines
20 KiB
Perl
640 lines
20 KiB
Perl
#! @perl@
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use strict;
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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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umask(0022);
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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 @initrdAvailableKernelModules = ();
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my @modulePackages = ();
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my @imports;
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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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# Determine CPU governor to use
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if (-e "/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors") {
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my $governors = read_file("/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors");
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# ondemand governor is not available on sandy bridge or later Intel CPUs
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my @desired_governors = ("ondemand", "powersave");
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my $e;
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foreach $e (@desired_governors) {
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if (index($governors, $e) != -1) {
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last if (push @attrs, "powerManagement.cpuFreqGovernor = lib.mkDefault \"$e\";");
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}
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}
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}
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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" || $device eq "0x43b1"
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) )
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{
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push @modulePackages, "config.boot.kernelPackages.broadcom_sta";
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push @kernelModules, "wl";
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}
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# broadcom FullMac driver
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# list taken from
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# https://wireless.wiki.kernel.org/en/users/Drivers/brcm80211#brcmfmac
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if ($vendor eq "0x14e4" &&
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($device eq "0x43a3" || $device eq "0x43df" || $device eq "0x43ec" ||
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$device eq "0x43d3" || $device eq "0x43d9" || $device eq "0x43e9" ||
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$device eq "0x43ba" || $device eq "0x43bb" || $device eq "0x43bc" ||
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$device eq "0xaa52" || $device eq "0x43ca" || $device eq "0x43cb" ||
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$device eq "0x43cc" || $device eq "0x43c3" || $device eq "0x43c4" ||
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$device eq "0x43c5"
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) )
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{
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# we need e.g. brcmfmac43602-pcie.bin
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push @imports, "<nixpkgs/nixos/modules/hardware/network/broadcom-43xx.nix>";
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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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# 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 and MMC devices.
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foreach my $path (glob "/sys/class/{block,mmc_host}/*") {
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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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# Add bcache module, if needed.
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my @bcacheDevices = glob("/dev/bcache*");
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if (scalar @bcacheDevices > 0) {
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push @initrdAvailableKernelModules, "bcache";
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}
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# Prevent unbootable systems if LVM snapshots are present at boot time.
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if (`lsblk -o TYPE` =~ "lvm") {
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push @initrdKernelModules, "dm-snapshot";
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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, "virtualisation.virtualbox.guest.enable = true;"
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}
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# Likewise for QEMU.
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if ($virt eq "qemu" || $virt eq "kvm" || $virt eq "bochs") {
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push @imports, "<nixpkgs/nixos/modules/profiles/qemu-guest.nix>";
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}
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# Also for Hyper-V.
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if ($virt eq "microsoft") {
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push @attrs, "virtualisation.hypervGuest.enable = true;"
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}
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# Pull in NixOS configuration for containers.
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if ($virt eq "systemd-nspawn") {
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push @attrs, "boot.isContainer = true;";
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}
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# Provide firmware for devices that are not detected by this script,
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# unless we're in a VM/container.
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push @imports, "<nixpkgs/nixos/modules/installer/scan/not-detected.nix>"
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if $virt eq "none";
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# For a device name like /dev/sda1, find a more stable path like
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# /dev/disk/by-uuid/X or /dev/disk/by-label/Y.
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sub findStableDevPath {
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my ($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 $dev;
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}
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push @attrs, "services.xserver.videoDrivers = [ \"$videoDriver\" ];" if $videoDriver;
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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", err_mode => 'carp');
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my @swapDevices;
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if (@swaps) {
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shift @swaps;
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foreach my $swap (@swaps) {
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my @fields = split ' ', $swap;
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my $swapFilename = $fields[0];
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my $swapType = $fields[1];
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next unless -e $swapFilename;
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my $dev = findStableDevPath $swapFilename;
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if ($swapType =~ "partition") {
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# zram devices are more likely created by configuration.nix, so
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# ignore them here
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next if ($swapFilename =~ /^\/dev\/zram/);
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push @swapDevices, "{ device = \"$dev\"; }";
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} elsif ($swapType =~ "file") {
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# swap *files* are more likely specified in configuration.nix, so
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# ignore them here.
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} else {
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die "Unsupported swap type: $swapType\n";
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}
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}
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}
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# Generate the fileSystems option from the currently mounted
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# filesystems.
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sub in {
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my ($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 = $fields[4];
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$mountPoint =~ s/\\040/ /g; # account for mount points with spaces in the name (\040 is the escape character)
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$mountPoint =~ s/\\011/\t/g; # account for mount points with tabs in the name (\011 is the escape character)
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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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$device =~ s/\\040/ /g; # account for devices with spaces in the name (\040 is the escape character)
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$device =~ s/\\011/\t/g; # account for mount points with tabs in the name (\011 is the escape character)
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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 $msg = `btrfs subvol show $rootDir$mountPoint`;
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if ($? != 0 || $msg =~ /ERROR:/s) {
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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, @info) = runCommand("btrfs subvol show $rootDir$mountPoint");
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if ($status != 0 || join("", @info) =~ /ERROR:/) {
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die "Failed to retrieve subvolume info for $mountPoint\n";
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}
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my @ids = join("\n", @info) =~ m/^(?!\/\n).*Subvolume ID:[ \t\n]*([0-9]+)/s;
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if ($#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 @paths = join("", @info) =~ m/^([^\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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# Don't emit tmpfs entry for /tmp, because it most likely comes from the
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# boot.tmpOnTmpfs option in configuration.nix (managed declaratively).
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next if ($mountPoint eq "/tmp" && $fsType eq "tmpfs");
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# Emit the filesystem.
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$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 = \[ ${\join " ", map { "\"" . $_ . "\"" } uniq(@extraOptions)} \];
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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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# If this filesystem is on a LUKS device, then add a
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# boot.initrd.luks.devices entry.
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if (-e $device) {
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my $deviceName = basename(abs_path($device));
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if (-e "/sys/class/block/$deviceName"
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&& read_file("/sys/class/block/$deviceName/dm/uuid", err_mode => 'quiet') =~ /^CRYPT-LUKS/)
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{
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my @slaves = glob("/sys/class/block/$deviceName/slaves/*");
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if (scalar @slaves == 1) {
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my $slave = "/dev/" . basename($slaves[0]);
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if (-e $slave) {
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my $dmName = read_file("/sys/class/block/$deviceName/dm/name");
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chomp $dmName;
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# Ensure to add an entry only once
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my $luksDevice = " boot.initrd.luks.devices.\"$dmName\".device";
|
||
if ($fileSystems !~ /^\Q$luksDevice\E/m) {
|
||
$fileSystems .= "$luksDevice = \"${\(findStableDevPath $slave)}\";\n\n";
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
# For lack of a better way to determine it, guess whether we should use a
|
||
# bigger font for the console from the display mode on the first
|
||
# framebuffer. A way based on the physical size/actual DPI reported by
|
||
# the monitor would be nice, but I don't know how to do this without X :)
|
||
my $fb_modes_file = "/sys/class/graphics/fb0/modes";
|
||
if (-f $fb_modes_file && -r $fb_modes_file) {
|
||
my $modes = read_file($fb_modes_file);
|
||
$modes =~ m/([0-9]+)x([0-9]+)/;
|
||
my $console_width = $1, my $console_height = $2;
|
||
if ($console_width > 1920) {
|
||
push @attrs, "# High-DPI console";
|
||
push @attrs, 'console.font = lib.mkDefault "${pkgs.terminus_font}/share/consolefonts/ter-u28n.psf.gz";';
|
||
}
|
||
}
|
||
|
||
|
||
# Generate the hardware configuration file.
|
||
|
||
sub toNixStringList {
|
||
my $res = "";
|
||
foreach my $s (@_) {
|
||
$res .= " \"$s\"";
|
||
}
|
||
return $res;
|
||
}
|
||
sub toNixList {
|
||
my $res = "";
|
||
foreach my $s (@_) {
|
||
$res .= " $s";
|
||
}
|
||
return $res;
|
||
}
|
||
|
||
sub multiLineList {
|
||
my $indent = shift;
|
||
return " [ ]" if !@_;
|
||
my $res = "\n${indent}[ ";
|
||
my $first = 1;
|
||
foreach my $s (@_) {
|
||
$res .= "$indent " if !$first;
|
||
$first = 0;
|
||
$res .= "$s\n";
|
||
}
|
||
$res .= "$indent]";
|
||
return $res;
|
||
}
|
||
|
||
my $initrdAvailableKernelModules = toNixStringList(uniq @initrdAvailableKernelModules);
|
||
my $initrdKernelModules = toNixStringList(uniq @initrdKernelModules);
|
||
my $kernelModules = toNixStringList(uniq @kernelModules);
|
||
my $modulePackages = toNixList(uniq @modulePackages);
|
||
|
||
my $fsAndSwap = "";
|
||
if (!$noFilesystems) {
|
||
$fsAndSwap = "\n$fileSystems ";
|
||
$fsAndSwap .= "swapDevices =" . multiLineList(" ", @swapDevices) . ";\n";
|
||
}
|
||
|
||
my $hwConfig = <<EOF;
|
||
# Do not modify this file! It was generated by ‘nixos-generate-config’
|
||
# and may be overwritten by future invocations. Please make changes
|
||
# to /etc/nixos/configuration.nix instead.
|
||
{ config, lib, pkgs, ... }:
|
||
|
||
{
|
||
imports =${\multiLineList(" ", @imports)};
|
||
|
||
boot.initrd.availableKernelModules = [$initrdAvailableKernelModules ];
|
||
boot.initrd.kernelModules = [$initrdKernelModules ];
|
||
boot.kernelModules = [$kernelModules ];
|
||
boot.extraModulePackages = [$modulePackages ];
|
||
$fsAndSwap
|
||
nix.maxJobs = lib.mkDefault $cpus;
|
||
${\join "", (map { " $_\n" } (uniq @attrs))}}
|
||
EOF
|
||
|
||
sub generateNetworkingDhcpConfig {
|
||
my $config = <<EOF;
|
||
# The global useDHCP flag is deprecated, therefore explicitly set to false here.
|
||
# Per-interface useDHCP will be mandatory in the future, so this generated config
|
||
# replicates the default behaviour.
|
||
networking.useDHCP = false;
|
||
EOF
|
||
|
||
foreach my $path (glob "/sys/class/net/*") {
|
||
my $dev = basename($path);
|
||
if ($dev ne "lo") {
|
||
$config .= " networking.interfaces.$dev.useDHCP = true;\n";
|
||
}
|
||
}
|
||
|
||
return $config;
|
||
}
|
||
|
||
|
||
if ($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 systemd-boot EFI boot loader.
|
||
boot.loader.systemd-boot.enable = true;
|
||
boot.loader.efi.canTouchEfiVariables = true;
|
||
EOF
|
||
} elsif (-e "/boot/extlinux") {
|
||
$bootLoaderConfig = <<EOF;
|
||
# Use the extlinux boot loader. (NixOS wants to enable GRUB by default)
|
||
boot.loader.grub.enable = false;
|
||
# Enables the generation of /boot/extlinux/extlinux.conf
|
||
boot.loader.generic-extlinux-compatible.enable = true;
|
||
EOF
|
||
} elsif ($virt ne "systemd-nspawn") {
|
||
$bootLoaderConfig = <<EOF;
|
||
# Use the GRUB 2 boot loader.
|
||
boot.loader.grub.enable = true;
|
||
boot.loader.grub.version = 2;
|
||
# boot.loader.grub.efiSupport = true;
|
||
# boot.loader.grub.efiInstallAsRemovable = true;
|
||
# boot.loader.efi.efiSysMountPoint = "/boot/efi";
|
||
# Define on which hard drive you want to install Grub.
|
||
# boot.loader.grub.device = "/dev/sda"; # or "nodev" for efi only
|
||
EOF
|
||
}
|
||
|
||
my $networkingDhcpConfig = generateNetworkingDhcpConfig();
|
||
|
||
write_file($fn, <<EOF);
|
||
@configuration@
|
||
EOF
|
||
} else {
|
||
print STDERR "warning: not overwriting existing $fn\n";
|
||
}
|
||
}
|
||
|
||
# workaround for a bug in substituteAll
|