diff options
Diffstat (limited to 'nixos/modules/system/boot/loader/grub/install-grub.pl')
| -rw-r--r-- | nixos/modules/system/boot/loader/grub/install-grub.pl | 180 |
1 files changed, 162 insertions, 18 deletions
diff --git a/nixos/modules/system/boot/loader/grub/install-grub.pl b/nixos/modules/system/boot/loader/grub/install-grub.pl index b4900358a5d..eef81d81484 100644 --- a/nixos/modules/system/boot/loader/grub/install-grub.pl +++ b/nixos/modules/system/boot/loader/grub/install-grub.pl @@ -1,10 +1,12 @@ use strict; use warnings; +use Class::Struct; use XML::LibXML; use File::Basename; use File::Path; use File::stat; use File::Copy; +use File::Slurp; use POSIX; use Cwd; @@ -27,6 +29,14 @@ sub writeFile { close FILE or die; } +sub runCommand { + my ($cmd) = @_; + open FILE, "$cmd 2>/dev/null |" or die "Failed to execute: $cmd\n"; + my @ret = <FILE>; + close FILE; + return ($?, @ret); +} + my $grub = get("grub"); my $grubVersion = int(get("version")); my $extraConfig = get("extraConfig"); @@ -39,7 +49,7 @@ my $configurationLimit = int(get("configurationLimit")); my $copyKernels = get("copyKernels") eq "true"; my $timeout = int(get("timeout")); my $defaultEntry = int(get("default")); -my $explicitBootRoot = get("explicitBootRoot"); +my $fsIdentifier = get("fsIdentifier"); $ENV{'PATH'} = get("path"); die "unsupported GRUB version\n" if $grubVersion != 1 && $grubVersion != 2; @@ -48,23 +58,148 @@ print STDERR "updating GRUB $grubVersion menu...\n"; mkpath("/boot/grub", 0, 0700); - # Discover whether /boot is on the same filesystem as / and # /nix/store. If not, then all kernels and initrds must be copied to -# /boot, and all paths in the GRUB config file must be relative to the -# root of the /boot filesystem. `$bootRoot' is the path to be -# prepended to paths under /boot. -my $bootRoot = "/boot"; -if (stat("/")->dev != stat("/boot")->dev) { - $bootRoot = ""; - $copyKernels = 1; -} elsif (stat("/boot")->dev != stat("/nix/store")->dev) { +# /boot. +if (stat("/boot")->dev != stat("/nix/store")->dev) { $copyKernels = 1; } -if ($explicitBootRoot ne "") { - $bootRoot = $explicitBootRoot; +# Discover information about the location of /boot +struct(Fs => { + device => '$', + type => '$', + mount => '$', +}); +sub PathInMount { + my ($path, $mount) = @_; + my @splitMount = split /\//, $mount; + my @splitPath = split /\//, $path; + if ($#splitPath < $#splitMount) { + return 0; + } + for (my $i = 0; $i <= $#splitMount; $i++) { + if ($splitMount[$i] ne $splitPath[$i]) { + return 0; + } + } + return 1; } +sub GetFs { + my ($dir) = @_; + my $bestFs = Fs->new(device => "", type => "", mount => ""); + 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]; + + # 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 { $_ eq "ro" } @mountOptions); + + # Ensure this matches the intended directory + next unless PathInMount($dir, $mountPoint); + + # Is it better than our current match? + if (length($mountPoint) > length($bestFs->mount)) { + $bestFs = Fs->new(device => $device, type => $fsType, mount => $mountPoint); + } + } + return $bestFs; +} +struct (Grub => { + path => '$', + search => '$', +}); +my $driveid = 1; +sub GrubFs { + my ($dir) = @_; + my $fs = GetFs($dir); + my $path = "/" . substr($dir, length($fs->mount)); + my $search = ""; + + if ($grubVersion > 1) { + # ZFS is completely separate logic as zpools are always identified by a label + # or custom UUID + if ($fs->type eq 'zfs') { + my $sid = index($fs->device, '/'); + + if ($sid < 0) { + $search = '--label ' . $fs->device; + $path = '/@' . $path; + } else { + $search = '--label ' . substr($fs->device, 0, $sid); + $path = '/' . substr($fs->device, $sid) . '/@' . $path; + } + } else { + my %types = ('uuid' => '--fs-uuid', 'label' => '--label'); + + if ($fsIdentifier eq 'provided') { + # If the provided dev is identifying the partition using a label or uuid, + # we should get the label / uuid and do a proper search + my @matches = $fs->device =~ m/\/dev\/disk\/by-(label|uuid)\/(.*)/; + if ($#matches > 1) { + die "Too many matched devices" + } elsif ($#matches == 1) { + $search = "$types{$matches[0]} $matches[1]" + } + } else { + # Determine the identifying type + $search = $types{$fsIdentifier} . ' '; + + # Based on the type pull in the identifier from the system + my ($status, @devInfo) = runCommand("blkid -o export @{[$fs->device]}"); + if ($status != 0) { + die "Failed to get blkid info for @{[$fs->mount]} on @{[$fs->device]}"; + } + my @matches = join("", @devInfo) =~ m/@{[uc $fsIdentifier]}=([^\n]*)/; + if ($#matches != 0) { + die "Couldn't find a $types{$fsIdentifier} for @{[$fs->device]}\n" + } + $search .= $matches[0]; + } + + # BTRFS is a special case in that we need to fix the referrenced path based on subvolumes + if ($fs->type eq 'btrfs') { + my ($status, @id_info) = runCommand("btrfs subvol show @{[$fs->mount]}"); + if ($status != 0) { + die "Failed to retrieve subvolume info for @{[$fs->mount]}\n"; + } + my @ids = join("", @id_info) =~ m/Object ID:[ \t\n]*([^ \t\n]*)/; + if ($#ids > 0) { + die "Btrfs subvol name for @{[$fs->device]} listed multiple times in mount\n" + } elsif ($#ids == 0) { + my ($status, @path_info) = runCommand("btrfs subvol list @{[$fs->mount]}"); + if ($status != 0) { + die "Failed to find @{[$fs->mount]} subvolume id from btrfs\n"; + } + my @paths = join("", @path_info) =~ m/ID $ids[0] [^\n]* path ([^\n]*)/; + if ($#paths > 0) { + die "Btrfs returned multiple paths for a single subvolume id, mountpoint @{[$fs->mount]}\n"; + } elsif ($#paths != 0) { + die "Btrfs did not return a path for the subvolume at @{[$fs->mount]}\n"; + } + $path = "/$paths[0]$path"; + } + } + } + if (not $search eq "") { + $search = "search --set=drive$driveid " . $search; + $path = "(\$drive$driveid)$path"; + $driveid += 1; + } + } + return Grub->new(path => $path, search => $search); +} +my $grubBoot = GrubFs("/boot"); +my $grubStore = GrubFs("/nix/store"); # Generate the header. my $conf .= "# Automatically generated. DO NOT EDIT THIS FILE!\n"; @@ -76,12 +211,17 @@ if ($grubVersion == 1) { "; if ($splashImage) { copy $splashImage, "/boot/background.xpm.gz" or die "cannot copy $splashImage to /boot\n"; - $conf .= "splashimage $bootRoot/background.xpm.gz\n"; + $conf .= "splashimage " . $grubBoot->path . "/background.xpm.gz\n"; } } else { + if ($copyKernels == 0) { + $conf .= " + " . $grubStore->search; + } $conf .= " + " . $grubBoot->search . " if [ -s \$prefix/grubenv ]; then load_env fi @@ -102,7 +242,7 @@ else { set timeout=$timeout fi - if loadfont $bootRoot/grub/fonts/unicode.pf2; then + if loadfont " . $grubBoot->path . "/grub/fonts/unicode.pf2; then set gfxmode=640x480 insmod gfxterm insmod vbe @@ -116,7 +256,7 @@ else { copy $splashImage, "/boot/background.png" or die "cannot copy $splashImage to /boot\n"; $conf .= " insmod png - if background_image $bootRoot/background.png; then + if background_image " . $grubBoot->path . "/background.png; then set color_normal=white/black set color_highlight=black/white else @@ -138,7 +278,7 @@ mkpath("/boot/kernels", 0, 0755) if $copyKernels; sub copyToKernelsDir { my ($path) = @_; - return $path unless $copyKernels; + return $grubStore->path . substr($path, length("/nix/store")) unless $copyKernels; $path =~ /\/nix\/store\/(.*)/ or die; my $name = $1; $name =~ s/\//-/g; my $dst = "/boot/kernels/$name"; @@ -151,7 +291,7 @@ sub copyToKernelsDir { rename $tmp, $dst or die "cannot rename $tmp to $dst\n"; } $copied{$dst} = 1; - return "$bootRoot/kernels/$name"; + return $grubBoot->path . "/kernels/$name"; } sub addEntry { @@ -178,6 +318,10 @@ sub addEntry { $conf .= " " . ($xen ? "module" : "initrd") . " $initrd\n\n"; } else { $conf .= "menuentry \"$name\" {\n"; + $conf .= $grubBoot->search . "\n"; + if ($copyKernels == 0) { + $conf .= $grubStore->search . "\n"; + } $conf .= " $extraPerEntryConfig\n" if $extraPerEntryConfig; $conf .= " multiboot $xen $xenParams\n" if $xen; $conf .= " " . ($xen ? "module" : "linux") . " $kernel $kernelParams\n"; @@ -195,7 +339,7 @@ addEntry("NixOS - Default", $defaultConfig); $conf .= "$extraEntries\n" unless $extraEntriesBeforeNixOS; # extraEntries could refer to @bootRoot@, which we have to substitute -$conf =~ s/\@bootRoot\@/$bootRoot/g; +$conf =~ s/\@bootRoot\@/$grubBoot->path/g; # Emit submenus for all system profiles. sub addProfile { |