Disallow running more than one instance of opercode

We don't want to let people run more than one instance of opencode
in one project directory, this will lead to chaos and then
they interfear with each other in weird ways like when one
stopps it crashes the other, etc.

.gitignore

@@ -0,0 +1,123 @@
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+pip-wheel-metadata/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+.python-version
+
+# pipenv
+Pipfile.lock
+
+# PEP 582
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/

README.md

@@ -8,9 +8,12 @@ the host.
 
 - Arch Linux–based image
 - Runs as the host user (same username, UID, GID)
+- **Per-project isolation**: Each project gets its own container (identified by project path hash)
+- **Shared persistent home**: All containers mount the same home directory from XDG_DATA_HOME, allowing tools to persist across projects
+- **Sudo access**: OpenCode agent can install project-specific dependencies that persist in the stopped container
+- **Hard linking support**: Can hard link files like `~/.gitconfig` to share configurations with containers
 - Mounts only the current project directory (same absolute path inside container)
-- Persists OpenCode state in XDG_DATA_HOME/opencode-container/container-home directory
-- No access to SSH keys, passwords, or full `$HOME`
+- **Security boundary**: No access to SSH keys, passwords, or full `$HOME` (intentionally prevents remote code pushes)
 - Simple shell function (`opencode`) to launch interactively
 
 ## Install

opencode-container.py

@@ -1,12 +1,20 @@
 #!/usr/bin/env python3
 
 import hashlib
+import logging
 import os
 import subprocess
 import sys
 import time
 from pathlib import Path
 
+logging.basicConfig(
+    level=logging.INFO,
+    format='%(message)s',
+    stream=sys.stderr
+)
+logger = logging.getLogger(__name__)
+
 
 class OpenCodeContainer:
     IMAGE = "opencode-container:latest"
@@ -45,6 +53,14 @@ class OpenCodeContainer:
         # Ensure container home directory exists
         self.container_home_path.mkdir(parents=True, exist_ok=True)
 
+        # Check if this project already has a running container
+        if self.container_exists() and self.container_running():
+            logger.error(f"Project '{self.project_path.name}' already has a running OpenCode container.")
+            logger.error(f"Container name: {self.container_name}")
+            logger.error("Wait for the current instance to finish or manually stop it with:")
+            logger.error(f"  docker stop {self.container_name}")
+            sys.exit(1)
+
         # Pre-create project directory structure to prevent root-owned directories
         try:
             relative_path = self.project_path.relative_to(Path.home())
@@ -60,7 +76,7 @@ class OpenCodeContainer:
             self.create_container()
 
         if not self.start_container():
-            print("Recreating container due to failed start")
+            logger.warning("Recreating container due to failed start")
             self.remove_container()
             self.create_container()
             if not self.start_container():
@@ -83,7 +99,7 @@ class OpenCodeContainer:
         ).returncode == 0
 
     def build_image(self) -> None:
-        print(f"Building image '{self.IMAGE}' with user {self.host_username} ({self.host_uid}:{self.host_gid})")
+        logger.info(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}",
@@ -98,7 +114,7 @@ class OpenCodeContainer:
     # =========================
 
     def create_container(self) -> None:
-        print(f"Creating container '{self.container_name}'")
+        logger.info(f"Creating container '{self.container_name}'")
 
         self._run([
             "docker", "create",