mirror of
https://github.com/NixOS/nixpkgs.git
synced 2024-11-01 15:11:25 +00:00
c3d22fdca1
I've been asked, on numerous occasions, by my students and others, how to 'sudo' on NixOS. Of course new users could read up in the manual on how to do that, or we could make it more accessible for them by simply making it visible in the default `configuration.nix` file. Additionally, as raised in [1], replacing `guest` with something more recognizable could be potentially beneficial to new users. I've opted for `jane` for now. [1]: https://github.com/NixOS/nixpkgs/pull/54519#issuecomment-457012223
658 lines
19 KiB
Perl
658 lines
19 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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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 $swap (@swaps) {
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$swap =~ /^(\S+)\s/;
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next unless -e $1;
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my $dev = findStableDevPath $1;
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push @swapDevices, "{ device = \"$dev\"; }";
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}
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}
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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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# 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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# 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";
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if ($fileSystems !~ /^\Q$luksDevice\E/m) {
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$fileSystems .= "$luksDevice = \"${\(findStableDevPath $slave)}\";\n\n";
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}
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}
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}
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}
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}
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}
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# Generate the hardware configuration file.
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sub toNixStringList {
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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 toNixList {
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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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my $res = "\n${indent}[ ";
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my $first = 1;
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foreach my $s (@_) {
|
||
$res .= "$indent " if !$first;
|
||
$first = 0;
|
||
$res .= "$s\n";
|
||
}
|
||
$res .= "$indent]";
|
||
return $res;
|
||
}
|
||
|
||
my $initrdAvailableKernelModules = toNixStringList(uniq @initrdAvailableKernelModules);
|
||
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 = [$initrdAvailableKernelModules ];
|
||
boot.kernelModules = [$kernelModules ];
|
||
boot.extraModulePackages = [$modulePackages ];
|
||
$fsAndSwap
|
||
nix.maxJobs = lib.mkDefault $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 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") {
|
||
$bootLoaderConfig = <<EOF;
|
||
# Use the GRUB 2 boot loader.
|
||
boot.loader.grub.enable = true;
|
||
boot.loader.grub.version = 2;
|
||
# boot.loader.grub.efiSupport = true;
|
||
# boot.loader.grub.efiInstallAsRemovable = true;
|
||
# boot.loader.efi.efiSysMountPoint = "/boot/efi";
|
||
# Define on which hard drive you want to install Grub.
|
||
# boot.loader.grub.device = "/dev/sda"; # or "nodev" for efi only
|
||
EOF
|
||
}
|
||
|
||
write_file($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 support via wpa_supplicant.
|
||
|
||
# Configure network proxy if necessary
|
||
# networking.proxy.default = "http://user:password\@proxy:port/";
|
||
# networking.proxy.noProxy = "127.0.0.1,localhost,internal.domain";
|
||
|
||
# Select internationalisation properties.
|
||
# i18n = {
|
||
# consoleFont = "Lat2-Terminus16";
|
||
# consoleKeyMap = "us";
|
||
# defaultLocale = "en_US.UTF-8";
|
||
# };
|
||
|
||
# Set your time zone.
|
||
# time.timeZone = "Europe/Amsterdam";
|
||
|
||
# List packages installed in system profile. To search, run:
|
||
# \$ nix search wget
|
||
# environment.systemPackages = with pkgs; [
|
||
# wget vim
|
||
# ];
|
||
|
||
# Some programs need SUID wrappers, can be configured further or are
|
||
# started in user sessions.
|
||
# programs.mtr.enable = true;
|
||
# programs.gnupg.agent = { enable = true; enableSSHSupport = true; };
|
||
|
||
# List services that you want to enable:
|
||
|
||
# Enable the OpenSSH daemon.
|
||
# services.openssh.enable = true;
|
||
|
||
# Open ports in the firewall.
|
||
# networking.firewall.allowedTCPPorts = [ ... ];
|
||
# networking.firewall.allowedUDPPorts = [ ... ];
|
||
# Or disable the firewall altogether.
|
||
# networking.firewall.enable = false;
|
||
|
||
# Enable CUPS to print documents.
|
||
# services.printing.enable = true;
|
||
|
||
# Enable sound.
|
||
# sound.enable = true;
|
||
# hardware.pulseaudio.enable = true;
|
||
|
||
# Enable the X11 windowing system.
|
||
# services.xserver.enable = true;
|
||
# services.xserver.layout = "us";
|
||
# services.xserver.xkbOptions = "eurosign:e";
|
||
|
||
# Enable touchpad support.
|
||
# services.xserver.libinput.enable = true;
|
||
|
||
# Enable the KDE Desktop Environment.
|
||
# services.xserver.displayManager.sddm.enable = true;
|
||
# services.xserver.desktopManager.plasma5.enable = true;
|
||
|
||
# Define a user account. Don't forget to set a password with ‘passwd’.
|
||
# users.users.jane = {
|
||
# isNormalUser = true;
|
||
# uid = 1000;
|
||
# extraGroups = [ "wheel" ]; # Enable ‘sudo’ for the user.
|
||
# };
|
||
|
||
# This value determines the NixOS release with which your system is to be
|
||
# compatible, in order to avoid breaking some software such as database
|
||
# servers. You should change this only after NixOS release notes say you
|
||
# should.
|
||
system.stateVersion = "${\(qw(@release@))}"; # Did you read the comment?
|
||
|
||
}
|
||
EOF
|
||
} else {
|
||
print STDERR "warning: not overwriting existing $fn\n";
|
||
}
|
||
}
|
||
|
||
# workaround for a bug in substituteAll
|