nixos/grub: support initrd secrets

nixos/modules/system/boot/loader/grub/install-grub.pl

@@ -49,7 +49,7 @@ my $extraPrepareConfig = get("extraPrepareConfig");
 my $extraPerEntryConfig = get("extraPerEntryConfig");
 my $extraEntries = get("extraEntries");
 my $extraEntriesBeforeNixOS = get("extraEntriesBeforeNixOS") eq "true";
-my $extraInitrd = get("extraInitrd");
+my $initrdSecrets = get("initrdSecrets");
 my $splashImage = get("splashImage");
 my $configurationLimit = int(get("configurationLimit"));
 my $copyKernels = get("copyKernels") eq "true";
@@ -228,13 +228,6 @@ my $grubStore;
 if ($copyKernels == 0) {
     $grubStore = GrubFs($storePath);
 }
-my $extraInitrdPath;
-if ($extraInitrd) {
-    if (! -f $extraInitrd) {
-        print STDERR "Warning: the specified extraInitrd " . $extraInitrd . " doesn't exist. Your system won't boot without it.\n";
-    }
-    $extraInitrdPath = GrubFs($extraInitrd);
-}
 
 # Generate the header.
 my $conf .= "# Automatically generated.  DO NOT EDIT THIS FILE!\n";
@@ -348,9 +341,23 @@ sub addEntry {
 
     my $kernel = copyToKernelsDir(Cwd::abs_path("$path/kernel"));
     my $initrd = copyToKernelsDir(Cwd::abs_path("$path/initrd"));
-    if ($extraInitrd) {
-        $initrd .= " " .$extraInitrdPath->path;
+
+    # Include second initrd with secrets
+    if ($initrdSecrets) {
+      # Get last element of path
+      $initrd =~ /\/([^\/]+)$/;
+      my $initrdSecretsPath = "$bootPath/kernels/$1-secrets";
+      $initrd .= " $initrd-secrets";
+      my $oldUmask = umask;
+      # Make sure initrd is not world readable (won't work if /boot is FAT)
+      umask 0137;
+      my $initrdSecretsPathTemp = File::Temp::mktemp("$initrdSecretsPath.XXXXXXXX");
+      system("$path/append-initrd-secrets", $initrdSecretsPathTemp) == 0 or die "failed to create initrd secrets\n";
+      rename $initrdSecretsPathTemp, $initrdSecretsPath or die "failed to move initrd secrets into place\n";
+      umask $oldUmask;
+      $copied{$initrdSecretsPath} = 1;
     }
+
     my $xen = -e "$path/xen.gz" ? copyToKernelsDir(Cwd::abs_path("$path/xen.gz")) : undef;
 
     # FIXME: $confName
@@ -373,9 +380,6 @@ sub addEntry {
         if ($copyKernels == 0) {
             $conf .= $grubStore->search . "\n";
         }
-        if ($extraInitrd) {
-            $conf .= $extraInitrdPath->search . "\n";
-        }
         $conf .= "  $extraPerEntryConfig\n" if $extraPerEntryConfig;
         $conf .= "  multiboot $xen $xenParams\n" if $xen;
         $conf .= "  " . ($xen ? "module" : "linux") . " $kernel $kernelParams\n";