Revert "Merge pull request #2449 from wkennington/master.grub"

This reverts commit 469f22d717e53c48d13a66ca862942e8098accc5, reversing
changes made to 0078bc5d8f87512104902eab00c8a44bef286067.

Conflicts:
	nixos/modules/installer/tools/nixos-generate-config.pl
	nixos/modules/system/boot/loader/grub/install-grub.pl
	nixos/release.nix
	nixos/tests/installer.nix

I tried to keep apparently-safe code in conflicts.

1 files changed, 0 insertions, 21 deletions

diff --git a/nixos/modules/installer/tools/nixos-generate-config.pl b/nixos/modules/installer/tools/nixos-generate-config.pl
index 73dd87cef5c..66a8152a3a6 100644
--- a/nixos/modules/installer/tools/nixos-generate-config.pl
+++ b/nixos/modules/installer/tools/nixos-generate-config.pl
@@ -20,13 +20,6 @@ sub uniq {
     return @res;
 }
 
-sub runCommand {
-    my ($cmd) = @_;
-    open FILE, "$cmd 2>/dev/null |" or die "Failed to execute: $cmd\n";
-    my @ret = <FILE>;
-    close FILE;
-    return ($?, @ret);
-}
 
 # Process the command line.
 my $outDir = "/etc/nixos";
@@ -344,20 +337,6 @@ EOF
         }
     }
 
-    # Is this a btrfs filesystem?
-    if ($fsType eq "btrfs") {
-        my ($status, @info) = runCommand("btrfs subvol show $rootDir$mountPoint");
-        if ($status != 0) {
-            die "Failed to retreive subvolume info for $mountPoint";
-        }
-        my @subvols = join("", @info) =~ m/Name:[ \t\n]*([^ \t\n]*)/;
-        if ($#subvols > 0) {
-            die "Btrfs subvol name for $mountPoint listed multiple times in mount\n"
-        } elsif ($#subvols == 0) {
-            push @extraOptions, "subvol=$subvols[0]";
-        }
-    }
-
     # Emit the filesystem.
     $fileSystems .= <<EOF;
   fileSystems.\"$mountPoint\" =