Fix container username and home mount

.gitignore

@@ -1,2 +0,0 @@
-container-home/*
-!container-home/.gitkeep

README.md

@@ -9,7 +9,7 @@ the host.
 - Arch Linux–based image
 - Runs as the host user (same username, UID, GID)
 - Mounts only the current project directory (same absolute path inside container)
-- Persists OpenCode state in ./container-home directory
+- Persists OpenCode state in XDG_DATA_HOME/opencode-container/container-home directory
 - No access to SSH keys, passwords, or full `$HOME`
 - Simple shell function (`opencode`) to launch interactively
 
@@ -24,10 +24,14 @@ git clone https://git.jeena.net/jeena/opencode-container.git
 Source the helper file `opencode.aliases` in your shell configuration  
 (`.bashrc` or `.zshrc`) so the `opencode` function is available in new sessions.
 
-We set up the ./container-home directory as a central $HOME inside of the
+We set up the XDG_DATA_HOME/opencode-container/container-home directory as a central $HOME inside of the
 container, independent of the session or project directory we start in. This
-presists the whole $HOME from inside the container so everything opencode
-writes into config files, etc. presists there.
+persists the whole $HOME from inside the container so everything OpenCode
+writes into config files, etc. persists there.
+
+## Environment Variables
+
+- `XDG_DATA_HOME`: Override default data directory (default: ~/.local/share)
 
 ## Usage
 

opencode-container.py

@@ -16,14 +16,35 @@ class OpenCodeContainer:
     def __init__(self):
         self.project_path = Path.cwd().resolve()
         self.project_id = self._project_id(self.project_path)
+
+        # Store host user info once
+        self.host_username = os.environ.get('USER', 'dev')
+        self.host_uid = os.getuid()
+        self.host_gid = os.getgid()
+
         self.container_name = f"oc-{self.project_path.name}-{self.project_id}"
         self.docker_context_dir = Path(__file__).resolve().parent
 
+    def _get_xdg_data_home(self) -> Path:
+        """Get XDG_DATA_HOME with fallback to ~/.local/share"""
+        xdg_data = os.environ.get('XDG_DATA_HOME')
+        if xdg_data:
+            return Path(xdg_data)
+        return Path.home() / '.local' / 'share'
+
+    @property
+    def container_home_path(self) -> Path:
+        """Container home directory in XDG_DATA_HOME"""
+        return self._get_xdg_data_home() / 'opencode-container' / 'container-home'
+
     # =========================
     # Public entrypoint
     # =========================
 
     def run(self, args: list[str]) -> None:
+        # Ensure container home directory exists
+        self.container_home_path.mkdir(parents=True, exist_ok=True)
+
         if not self.image_exists():
             self.build_image()
 
@@ -54,9 +75,12 @@ class OpenCodeContainer:
         ).returncode == 0
 
     def build_image(self) -> None:
-        print(f"Building image '{self.IMAGE}'")
+        print(f"Building image '{self.IMAGE}' with user {self.host_username} ({self.host_uid}:{self.host_gid})")
         self._run([
             "docker", "build",
+            "--build-arg", f"USERNAME={self.host_username}",
+            "--build-arg", f"UID={self.host_uid}",
+            "--build-arg", f"GID={self.host_gid}",
             "-t", self.IMAGE,
             str(self.docker_context_dir),
         ])
@@ -66,16 +90,14 @@ class OpenCodeContainer:
     # =========================
 
     def create_container(self) -> None:
-        uid = os.getuid()
-        gid = os.getgid()
-
         print(f"Creating container '{self.container_name}'")
 
         self._run([
             "docker", "create",
             "--name", self.container_name,
-            "--user", f"{uid}:{gid}",
+            "--user", f"{self.host_uid}:{self.host_gid}",
             "--volume", f"{self.project_path}:{self.project_path}",
+            "--volume", f"{self.container_home_path}:/home/{self.host_username}",
             self.IMAGE,
             "sh", "-c", "sleep infinity",
         ])