fix: check for XDG_CACHE_HOME

src/downgrade

@@ -91,13 +91,13 @@ get_real_user_home() {
 }
 
 detect_aur_caches() {
-  local home
-  home=$(get_real_user_home)
+  local cache_home
+  cache_home="${XDG_CACHE_HOME:-$(get_real_user_home)/.cache}"
 
-  [[ -z "$home" ]] && return 0
+  [[ -z "$cache_home" ]] && return 0
 
-  [[ -d "$home/.cache/yay" ]] && printf '%s\n' "$home/.cache/yay"
-  [[ -d "$home/.cache/paru/clone" ]] && printf '%s\n' "$home/.cache/paru/clone"
+  [[ -d "$cache_home/yay" ]] && printf '%s\n' "$cache_home/yay"
+  [[ -d "$cache_home/paru/clone" ]] && printf '%s\n' "$cache_home/paru/clone"
 }
 
 currently_installed() {

test/aur_fallback/detect_aur_caches.t

@@ -28,6 +28,23 @@ Detects both when both present
   /tmp/*/yay (glob)
   /tmp/*/paru/clone (glob)
 
+Detects both when both present, with xdg taking precedence
+
+  $ fake_home=$(mktemp -d --suffix @home)
+  $ fake_xdg=$(mktemp -d --suffix @xdg)
+  > XDG_CACHE_HOME="$fake_xdg"
+  > mkdir -p "$fake_xdg/yay"
+  > mkdir -p "$fake_xdg/paru/clone"
+  > mkdir -p "$fake_home/.cache/yay"
+  > mkdir -p "$fake_home/.cache/paru/clone"
+  > get_real_user_home() { echo "$fake_home"; }
+  > detect_aur_caches
+  /tmp/*@xdg/yay (glob)
+  /tmp/*@xdg/paru/clone (glob)
+Unset so doesnt get used by other tests
+  $ unset XDG_CACHE_HOME
+
+
 Returns nothing when neither present
 
   $ fake_home=$(mktemp -d)

test/helper.sh

@@ -21,6 +21,7 @@ export DOWNGRADE_FROM_ALA=0
 export DOWNGRADE_FROM_CACHE=0
 export DOWNGRADE_CONF="$SRCDIR/test/conf/downgrade_test.conf"
 export PACIGNORE_DEFAULT_CHECK=1
+export XDG_CACHE_HOME=""
 
 # Stub functions that won't work (on CI) or need different behavior.
 pacsort() { cat; }