Use HOST_ prefixed env vars for host XDG base dirs

cartridges/importer/bottles_source.py

@@ -98,7 +98,7 @@ class BottlesSource(URLExecutableSource):
                 candidates=(
                     shared.flatpak_dir / "com.usebottles.bottles" / "data" / "bottles",
                     shared.data_dir / "bottles/",
-                    shared.home / ".local" / "share" / "bottles",
+                    shared.host_data_dir / "bottles",
                 ),
                 paths={
                     "library.yml": LocationSubPath("library.yml"),

cartridges/importer/desktop_source.py

@@ -39,7 +39,7 @@ class DesktopSourceIterable(SourceIterable):
         icon_theme = Gtk.IconTheme.new()
 
         search_paths = [
-            shared.home / ".local" / "share",
+            shared.host_data_dir,
             "/run/host/usr/local/share",
             "/run/host/usr/share",
             "/run/host/usr/share/pixmaps",

cartridges/importer/heroic_source.py

@@ -233,7 +233,7 @@ class LegendaryIterable(StoreSubSourceIterable):
         else:
             # Heroic native
             logging.debug("Using Heroic native <= 2.8 legendary file")
-            path = shared.home / ".config"
+            path = shared.host_config_dir
 
         path = path / "legendary" / "installed.json"
         logging.debug("Using Heroic %s installed.json path %s", self.name, path)
@@ -371,7 +371,7 @@ class HeroicSource(URLExecutableSource):
                 schema_key="heroic-location",
                 candidates=(
                     shared.config_dir / "heroic",
-                    shared.home / ".config" / "heroic",
+                    shared.host_config_dir / "heroic",
                     shared.flatpak_dir
                     / "com.heroicgameslauncher.hgl"
                     / "config"

cartridges/importer/itch_source.py

@@ -93,7 +93,7 @@ class ItchSource(URLExecutableSource):
                 candidates=(
                     shared.flatpak_dir / "io.itch.itch" / "config" / "itch",
                     shared.config_dir / "itch",
-                    shared.home / ".config" / "itch",
+                    shared.host_config_dir / "itch",
                     shared.appdata_dir / "itch",
                 ),
                 paths={

cartridges/importer/legendary_source.py

@@ -108,7 +108,7 @@ class LegendarySource(ExecutableFormatSource):
                 schema_key="legendary-location",
                 candidates=(
                     shared.config_dir / "legendary",
-                    shared.home / ".config" / "legendary",
+                    shared.host_config_dir / "legendary",
                 ),
                 paths={
                     "installed.json": LocationSubPath("installed.json"),

cartridges/importer/lutris_source.py

@@ -110,7 +110,7 @@ class LutrisSource(URLExecutableSource):
                 candidates=(
                     shared.flatpak_dir / "net.lutris.Lutris" / "data" / "lutris",
                     shared.data_dir / "lutris",
-                    shared.home / ".local" / "share" / "lutris",
+                    shared.host_data_dir / "lutris",
                 ),
                 paths={
                     "pga.db": LocationSubPath("pga.db"),
@@ -122,7 +122,7 @@ class LutrisSource(URLExecutableSource):
                 candidates=(
                     shared.flatpak_dir / "net.lutris.Lutris" / "cache" / "lutris",
                     shared.cache_dir / "lutris",
-                    shared.home / ".cache" / "lutris",
+                    shared.host_cache_dir / "lutris",
                 ),
                 paths={
                     "coverart": LocationSubPath("coverart", True),

cartridges/importer/retroarch_source.py

@@ -157,7 +157,7 @@ class RetroarchSource(Source):
                     / "config"
                     / "retroarch",
                     shared.config_dir / "retroarch",
-                    shared.home / ".config" / "retroarch",
+                    shared.host_config_dir / "retroarch",
                     # TODO: Windows support, waiting for executable path setting improvement
                     # Path("C:\\RetroArch-Win64"),
                     # Path("C:\\RetroArch-Win32"),

cartridges/shared.py.in

@@ -17,8 +17,8 @@
 #
 # SPDX-License-Identifier: GPL-3.0-or-later
 
-import os
 from enum import IntEnum, auto
+from os import getenv
 from pathlib import Path
 
 from gi.repository import Gdk, Gio, GLib
@@ -43,19 +43,26 @@ schema = Gio.Settings.new(APP_ID)
 state_schema = Gio.Settings.new(APP_ID + ".State")
 
 home = Path.home()
+
 data_dir = Path(GLib.get_user_data_dir())
+host_data_dir = Path(getenv("HOST_XDG_DATA_HOME", Path.home() / ".local" / "share"))
+
 config_dir = Path(GLib.get_user_config_dir())
+host_config_dir = Path(getenv("HOST_XDG_CONFIG_HOME", Path.home() / ".config"))
+
 cache_dir = Path(GLib.get_user_cache_dir())
+host_cache_dir = Path(getenv("HOST_XDG_CACHE_HOME", Path.home() / ".cache"))
+
 flatpak_dir = home / ".var" / "app"
 
 games_dir = data_dir / "cartridges" / "games"
 covers_dir = data_dir / "cartridges" / "covers"
 
-appdata_dir = Path(os.getenv("appdata") or "C:\\Users\\Default\\AppData\\Roaming")
+appdata_dir = Path(getenv("appdata") or r"C:\Users\Default\AppData\Roaming")
 local_appdata_dir = Path(
-    os.getenv("csidl_local_appdata") or "C:\\Users\\Default\\AppData\\Local"
+    getenv("csidl_local_appdata") or r"C:\Users\Default\AppData\Local"
 )
-programfiles32_dir = Path(os.getenv("programfiles(x86)") or "C:\\Program Files (x86)")
+programfiles32_dir = Path(getenv("programfiles(x86)") or r"C:\Program Files (x86)")
 
 try:
     scale_factor = max(