From 722dde361ca51864fd9b3b6b9a78875e436fbc24 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=B6rg=20Thalheim?= <joerg@thalheim.io>
Date: Fri, 26 Aug 2022 10:28:07 +0200
Subject: zfs: support for root dataset mountpoint and mountpoint=none

---
 default.nix | 35 +++++++++++++++++++++++++++--------
 1 file changed, 27 insertions(+), 8 deletions(-)

(limited to 'default.nix')

diff --git a/default.nix b/default.nix
index ac84345..1865d69 100644
--- a/default.nix
+++ b/default.nix
@@ -256,29 +256,48 @@ let
 
   mount.zfs = mount.noop;
 
-  mount.zpool = q: x: (
+  mount.zpool = q: x:
+    let
+      datasets = [{
+        inherit (q) name;
+        type = "zfs_filesystem";
+        dataset = q.name;
+        mountpoint = x.mountpoint or "/${q.name}";
+        options = q.rootFsOptions or { };
+      }] ++ x.datasets;
+    in
     recursiveUpdate
-      (foldl' recursiveUpdate { } (map (mount-f (q // { pool = q.name; })) x.datasets))
+      (foldl' recursiveUpdate { }
+        (
+          (map
+            (x: mount-f
+              ({
+                dataset = x.dataset or "${q.name}/${x.name}";
+                mountpoint = x.mountpoint or "/${q.name}/${x.name}";
+              } // q)
+              x)
+            datasets)
+        )
+      )
       {
         zpool.${q.device} = ''
           zpool list '${q.name}' >/dev/null 2>/dev/null || zpool import '${q.name}'
         '';
-      }
-  );
+      };
 
   mount.zfs_filesystem = q: x: {
-    zfs.${x.mountpoint} = ''
-      if ! findmnt '${q.pool}/${x.name}' /mnt${x.mountpoint} > /dev/null 2>&1; then
+    zfs.${q.mountpoint} = lib.optionalString ((x.options.mountpoint or "") != "none") ''
+      if ! findmnt '${q.dataset}' /mnt${q.mountpoint} > /dev/null 2>&1; then
         mount \
           ${lib.optionalString ((x.options.mountpoint or "") != "legacy") "-o zfsutil"} \
-          -t zfs ${q.pool}/${x.name} /mnt${x.mountpoint} \
+          -t zfs ${q.dataset} /mnt${q.mountpoint} \
           -o X-mount.mkdir
       fi
     '';
   };
 
   mount.zfs_volume = q: x:
-    mount-f { device = "/dev/zvol/${q.pool}/${x.name}"; } x.content;
+    mount-f { device = "/dev/zvol/${q.dataset}"; } x.content;
 
 in
 {
-- 
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