From b07602a604d6d5db3b1ff85d1c3c008ad25245fa Mon Sep 17 00:00:00 2001
From: jakobrs <jakobrs100@gmail.com>
Date: Thu, 21 May 2020 09:10:47 +0200
Subject: nixos/lib, nixos/filesystems: Make fsBefore more stable, and add
 `depends` option

---
 nixos/lib/utils.nix | 26 ++++++++++++++++++++++++--
 1 file changed, 24 insertions(+), 2 deletions(-)

(limited to 'nixos/lib/utils.nix')

diff --git a/nixos/lib/utils.nix b/nixos/lib/utils.nix
index c9dfdbed99a..1a51b149e56 100644
--- a/nixos/lib/utils.nix
+++ b/nixos/lib/utils.nix
@@ -14,8 +14,30 @@ rec {
   fsNeededForBoot = fs: fs.neededForBoot || elem fs.mountPoint pathsNeededForBoot;
 
   # Check whenever `b` depends on `a` as a fileSystem
-  fsBefore = a: b: a.mountPoint == b.device
-                || hasPrefix "${a.mountPoint}${optionalString (!(hasSuffix "/" a.mountPoint)) "/"}" b.mountPoint;
+  fsBefore = a: b:
+    let
+      # normalisePath adds a slash at the end of the path if it didn't already
+      # have one.
+      #
+      # The reason slashes are added at the end of each path is to prevent `b`
+      # from accidentally depending on `a` in cases like
+      #    a = { mountPoint = "/aaa"; ... }
+      #    b = { device     = "/aaaa"; ... }
+      # Here a.mountPoint *is* a prefix of b.device even though a.mountPoint is
+      # *not* a parent of b.device. If we add a slash at the end of each string,
+      # though, this is not a problem: "/aaa/" is not a prefix of "/aaaa/".
+      normalisePath = path: "${path}${optionalString (!(hasSuffix "/" path)) "/"}";
+      normalise = mount: mount // { device = normalisePath mount.device;
+                                    mountPoint = normalisePath mount.mountPoint;
+                                    depends = map normalisePath mount.depends;
+                                  };
+
+      a' = normalise a;
+      b' = normalise b;
+
+    in hasPrefix a'.mountPoint b'.device
+    || hasPrefix a'.mountPoint b'.mountPoint
+    || any (hasPrefix a'.mountPoint) b'.depends;
 
   # Escape a path according to the systemd rules, e.g. /dev/xyzzy
   # becomes dev-xyzzy.  FIXME: slow.
-- 
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