feat: Configure cache environment variables for Hugging Face and update Docker settings

.env.example

@@ -12,9 +12,10 @@ ABOGEN_OUTPUT_DIR=./storage/output
 
 # Temporary working directory. When running in Docker, keep this inside the
 # mounted data volume (or another writable host path) so non-root users can
-# write to it. For local (non-Docker) usage, change this to a path that makes
-# sense on your machine or comment it out to fall back to the OS cache
-# directory. Mounted to /data/cache in Docker.
+# write to it. Hugging Face caches and other temp files are redirected here via
+# XDG_CACHE_HOME/HF_HOME when running under Docker. For local (non-Docker)
+# usage, change this to a path that makes sense on your machine or comment it
+# out to fall back to the OS cache directory. Mounted to /data/cache in Docker.
 ABOGEN_TEMP_DIR=./storage/tmp
 
 # UID/GID used when running the Docker container. 1000:1000 matches most Linux hosts.

README.md

@@ -53,6 +53,10 @@ Browse to http://localhost:8808. Uploaded source files are stored in `/data/uplo
 | `ABOGEN_OUTPUT_DIR` | `/data/outputs` | Container path for rendered audio/subtitles |
 | `ABOGEN_SETTINGS_DIR` | `/config` | Container path for JSON settings/configuration |
 | `ABOGEN_TEMP_DIR` | `/data/cache` (Docker) or platform cache dir | Container path for temporary files |
+| `XDG_CACHE_HOME` | `/data/cache` | Base directory for cache data (used by many Python libraries) |
+| `HF_HOME` | `/data/cache/huggingface` | Hugging Face model cache directory |
+| `HUGGINGFACE_HUB_CACHE` | `/data/cache/huggingface` | Alias for Hugging Face hub cache |
+| `TRANSFORMERS_CACHE` | `/data/cache/huggingface` | Transformers model cache directory |
 | `ABOGEN_UID` | `1000` | UID that the container should run as (matches host user) |
 | `ABOGEN_GID` | `1000` | GID that the container should run as (matches host group) |
 
@@ -71,7 +75,10 @@ When running via Docker Compose, set `ABOGEN_SETTINGS_DIR`,
 `ABOGEN_OUTPUT_DIR`, and `ABOGEN_TEMP_DIR` in your `.env` file to the host
 directories you want mounted into the container. Compose maps them to
 `/config`, `/data/outputs`, and `/data/cache` respectively while exporting
-those in-container paths to the application. Ensure each host directory exists
+those in-container paths to the application. The cache mount is also shared
+with common environment variables (`XDG_CACHE_HOME`, `HF_HOME`,
+`HUGGINGFACE_HUB_CACHE`, `TRANSFORMERS_CACHE`) so libraries like Hugging Face
+store downloads in the same writable location. Ensure each host directory exists
 and is writable by the UID/GID you configure before starting the stack.
 
 ### Docker Compose (GPU by default)

abogen/utils.py

@@ -158,13 +158,29 @@ def get_user_cache_root():
         if last_error is not None:
             raise last_error
 
+    def _configure_cache_env(cache_path):
+        os.environ.setdefault("XDG_CACHE_HOME", cache_path)
+
+        hf_cache = os.path.join(cache_path, "huggingface")
+        for env_var in ("HF_HOME", "HUGGINGFACE_HUB_CACHE", "TRANSFORMERS_CACHE"):
+            os.environ.setdefault(env_var, hf_cache)
+
+        # Ensure Hugging Face cache directory exists so downloads succeed.
+        ensure_directory(hf_cache)
+
+        if not os.environ.get("HOME"):
+            os.environ["HOME"] = os.path.dirname(cache_path) or "/"
+
+    cache_root = None
+
     override = os.environ.get("ABOGEN_TEMP_DIR")
     if override:
         try:
-            return ensure_directory(override)
+            cache_root = ensure_directory(override)
         except OSError as exc:
             logger.warning("ABOGEN_TEMP_DIR=%s is not writable: %s", override, exc)
 
+    if cache_root is None:
         from platformdirs import user_cache_dir
 
         default_cache = user_cache_dir("abogen", appauthor=False, opinion=True)
@@ -178,12 +194,15 @@ def get_user_cache_root():
         ]
 
         try:
-        return _try_paths(*fallback_paths)
+            cache_root = _try_paths(*fallback_paths)
         except OSError:
             # Final safety net – attempt a tmp directory unique to this process.
             tmp_candidate = os.path.join("/tmp", f"abogen-cache-{os.getpid()}")
             logger.warning("Falling back to temp cache directory %s", tmp_candidate)
-        return ensure_directory(tmp_candidate)
+            cache_root = ensure_directory(tmp_candidate)
+
+    _configure_cache_env(cache_root)
+    return cache_root
 
 
 def get_user_cache_path(folder=None):

docker-compose.yaml

@@ -23,6 +23,11 @@ services:
       ABOGEN_OUTPUT_DIR: "/data/outputs"
       ABOGEN_OUTPUT_ROOT: "/data/outputs"
       ABOGEN_TEMP_DIR: "/data/cache"
+  HOME: "/data"
+  XDG_CACHE_HOME: "/data/cache"
+  HF_HOME: "/data/cache/huggingface"
+  HUGGINGFACE_HUB_CACHE: "/data/cache/huggingface"
+  TRANSFORMERS_CACHE: "/data/cache/huggingface"
     # --- GPU support -----------------------------------------------------
     # These settings assume the NVIDIA Container Toolkit is installed.
     # Leave them in place for GPU acceleration; comment out the entire block