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-rw-r--r--nixos/lib/utils.nix8
1 files changed, 5 insertions, 3 deletions
diff --git a/nixos/lib/utils.nix b/nixos/lib/utils.nix
index 21f4c7c6988..543c8a8882e 100644
--- a/nixos/lib/utils.nix
+++ b/nixos/lib/utils.nix
@@ -2,9 +2,11 @@ pkgs: with pkgs.lib;
 
 rec {
 
-  # Check whenever fileSystem is needed for boot
-  fsNeededForBoot = fs: fs.neededForBoot
-                     || elem fs.mountPoint [ "/" "/nix" "/nix/store" "/var" "/var/log" "/var/lib" "/etc" ];
+  # Check whenever fileSystem is needed for boot.  NOTE: Make sure
+  # pathsNeededForBoot is closed under the parent relationship, i.e. if /a/b/c
+  # is in the list, put /a and /a/b in as well.
+  pathsNeededForBoot = [ "/" "/nix" "/nix/store" "/var" "/var/log" "/var/lib" "/etc" ];
+  fsNeededForBoot = fs: fs.neededForBoot || elem fs.mountPoint pathsNeededForBoot;
 
   # Check whenever `b` depends on `a` as a fileSystem
   fsBefore = a: b: a.mountPoint == b.device