From 05c7601a6afcec2576f7b60b97d6bd871cd94922 Mon Sep 17 00:00:00 2001
From: Anthony Wang <a@unnamed.website>
Date: Sat, 10 Jan 2026 16:20:55 -0600
Subject: [PATCH] deja-dup: fix fusermount error

Currently the Meson option `fusermount_command` is set to a path in the Nix store, but `fusermount` requires setuid, so when trying to mount a restic backup, it fails with `fusermount: mount failed: Operation not permitted`. This commit instead patches deja-dup's `find-fusermount` script to use the setuid wrapper `/run/wrappers/bin/fusermount` if it exists.

I also switched the package from using fuse2 to fuse3 because both are supported and I didn't see a reason to use the older version.
---
 .../de/deja-dup/find-fusermount-setuid.patch        | 13 +++++++++++++
 pkgs/by-name/de/deja-dup/package.nix                |  4 ++--
 2 files changed, 15 insertions(+), 2 deletions(-)
 create mode 100644 pkgs/by-name/de/deja-dup/find-fusermount-setuid.patch

diff --git a/pkgs/by-name/de/deja-dup/find-fusermount-setuid.patch b/pkgs/by-name/de/deja-dup/find-fusermount-setuid.patch
new file mode 100644
index 000000000000..3ef12d6949ce
--- /dev/null
+++ b/pkgs/by-name/de/deja-dup/find-fusermount-setuid.patch
@@ -0,0 +1,13 @@
+diff --git a/libdeja/find-fusermount b/libdeja/find-fusermount
+index 1b3211bb..95b35cf5 100755
+--- a/libdeja/find-fusermount
++++ b/libdeja/find-fusermount
+@@ -20,6 +20,8 @@
+ if [ ! -f /.flatpak-info ]; then
+   if [ -n "@FUSERMOUNT_CMD@" ]; then
+     echo "@FUSERMOUNT_CMD@"
++  elif [ -f /run/wrappers/bin/fusermount3 ]; then
++    echo /run/wrappers/bin/fusermount3
+   elif command -pv fusermount3 > /dev/null; then
+     command -pv fusermount3
+   elif command -pv fusermount > /dev/null; then
diff --git a/pkgs/by-name/de/deja-dup/package.nix b/pkgs/by-name/de/deja-dup/package.nix
index 9ceb043ee771..65a80054196b 100644
--- a/pkgs/by-name/de/deja-dup/package.nix
+++ b/pkgs/by-name/de/deja-dup/package.nix
@@ -21,7 +21,6 @@
   json-glib,
   borgbackup,
   duplicity,
-  fuse,
   rclone,
   restic,
   nix-update-script,
@@ -66,7 +65,6 @@ stdenv.mkDerivation (finalAttrs: {
     # Check https://gitlab.gnome.org/World/deja-dup/-/blob/main/meson.options
     (lib.mesonOption "borg_command" (lib.getExe borgbackup))
     (lib.mesonOption "duplicity_command" (lib.getExe duplicity))
-    (lib.mesonOption "fusermount_command" (lib.getExe' fuse "fusermount"))
     (lib.mesonOption "rclone_command" (lib.getExe rclone))
     (lib.mesonOption "restic_command" (lib.getExe restic))
     (lib.mesonEnable "packagekit" false) # packagekit-glib not packaged
@@ -79,6 +77,8 @@ stdenv.mkDerivation (finalAttrs: {
     )
   '';
 
+  patches = [ ./find-fusermount-setuid.patch ];
+
   passthru = {
     updateScript = nix-update-script { };
   };