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nixos-generate-config: Emit fileSystems automatically

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This commit is contained in:
Eelco Dolstra 2013-10-11 17:17:26 +02:00
parent 677d9882b0
commit 984921e657
1 changed files with 84 additions and 15 deletions
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99
nixos/modules/installer/tools/nixos-generate-config.pl
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@ -6,6 +6,19 @@ 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 $outDir = "/etc/nixos";
@ -192,7 +205,8 @@ if ($dmi =~ /Manufacturer: innotek/) {
}
# Generate the list of swap devices.
# Generate the swapDevices option from the currently activated swap
# devices.
my @swaps = read_file("/proc/swaps");
shift @swaps;
my @swapDevices;
@ -202,20 +216,75 @@ foreach my $swap (@swaps) {
}
# Generate the hardware configuration file.
# Generate the fileSystems option from the currently mounted
# filesystems.
sub in {
my ($d1, $d2) = @_;
return $d1 eq $d2 || substr($d1, 0, length($d2) + 1) eq "$d2/";
}
sub removeDups {
my %seen;
my @res = ();
foreach my $s (@_) {
if (!defined $seen{$s}) {
$seen{$s} = "";
push @res, $s;
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 /,/, $fields[5];
# Skip special filesystems.
next if in($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]}$path\";
fsType = \"none\";
options = \"bind\";
};
EOF
next;
}
# Is this a mount of a loopback device?
my @extraOptions;
if ($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";
}
}
return @res;
# Emit the filesystem.
$fsByDev{$fields[2]} = $mountPoint;
$fileSystems .= <<EOF;
fileSystems.\"$mountPoint\" = {
device = \"$device\";
fsType = \"$fsType\";
options = \"${\join ",", uniq(@extraOptions, @superOptions, @mountOptions)}\";
};
EOF
}
# Generate the hardware configuration file.
sub toNixExpr {
my $res = "";
foreach my $s (@_) {
@ -238,9 +307,9 @@ sub multiLineList {
return $res;
}
my $initrdKernelModules = toNixExpr(removeDups @initrdKernelModules);
my $kernelModules = toNixExpr(removeDups @kernelModules);
my $modulePackages = toNixExpr(removeDups @modulePackages);
my $initrdKernelModules = toNixExpr(uniq @initrdKernelModules);
my $kernelModules = toNixExpr(uniq @kernelModules);
my $modulePackages = toNixExpr(uniq @modulePackages);
my $fn = "$outDir/hardware-configuration.nix";
print STDERR "writing $fn...\n";
@ -259,10 +328,10 @@ write_file($fn, <<EOF);
boot.kernelModules = [$kernelModules ];
boot.extraModulePackages = [$modulePackages ];
swapDevices = ${\multiLineList(" ", @swapDevices)};
${fileSystems} swapDevices = ${\multiLineList(" ", @swapDevices)};
nix.maxJobs = $cpus;
${\join "", (map { " $_\n" } (removeDups @attrs))}}
${\join "", (map { " $_\n" } (uniq @attrs))}}
EOF