From 1af136f785fb5e5da7a772cc8a3e4fd744994f6b Mon Sep 17 00:00:00 2001
From: "Adam C. Stephens" <adam@valkor.net>
Date: Sat, 3 Jan 2026 21:27:21 -0500
Subject: [PATCH] incus: patch lxc/rootfs directory to fix tmpfs-overlay

---
 pkgs/by-name/in/incus/generic.nix | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/pkgs/by-name/in/incus/generic.nix b/pkgs/by-name/in/incus/generic.nix
index 364d4a7017a1..b47d29f3d04e 100644
--- a/pkgs/by-name/in/incus/generic.nix
+++ b/pkgs/by-name/in/incus/generic.nix
@@ -108,6 +108,17 @@ buildGoModule (finalAttrs: {
   # required for go-cowsql.
   CGO_LDFLAGS_ALLOW = "(-Wl,-wrap,pthread_create)|(-Wl,-z,now)";
 
+  # add our lxc location to incus's acceptable rootFsPaths
+  # this is necessary for tmpfs/tmpfs-overlay to work
+  postPatch =
+    if (lib.versionAtLeast finalAttrs.version "6.16") then
+      ''
+        substituteInPlace internal/server/device/disk.go \
+          --replace-fail '"/opt/incus/lib/lxc/rootfs/"' '"${lxc}/lib/lxc/rootfs/"'
+      ''
+    else
+      null;
+
   postBuild = ''
     # build docs
     mkdir -p .sphinx/deps