feat: dev/main config profiles with branch override [skip-version]

- Add lpb.stack.dev.env and lpb.stack.main.env profiles
- lpb --tag dev → LPB_PI_REF=lpb-dev, LPB_CONFIG_REF=dev
- lpb --tag main → LPB_PI_REF=lpb, LPB_CONFIG_REF=main
- lpb --tag latest → same as main
- lpb --tag <custom> → no overrides (uses defaults)
- Fix start.sh to respect runtime env overrides (LPB_PI_REF, LPB_CONFIG_REF)
  instead of overwriting with baked-in values

Author: localpibox

lpb.stack.dev.env

@@ -0,0 +1,10 @@
+# lpb.stack.dev.env — Dev profile configuration
+#
+# Points to development branches for testing.
+# Used when running: lpb --tag dev
+
+# ─── Pi Monorepo ────────────────────────────────────────────────────────
+LPB_PI_REF=lpb-dev
+
+# ─── Config Preset ───────────────────────────────────────────────────────
+LPB_CONFIG_REF=dev

lpb.stack.main.env

@@ -0,0 +1,11 @@
+# lpb.stack.main.env — Main profile configuration
+#
+# Points to stable branches (lpb + main).
+# Used when running: lpb --tag main or lpb --tag latest
+
+# ─── Pi Monorepo ────────────────────────────────────────────────────────
+# Use 'lpb' branch (stable base) for main pipeline.
+LPB_PI_REF=lpb
+
+# ─── Config Preset ───────────────────────────────────────────────────────
+LPB_CONFIG_REF=main

scripts/lpb.py

@@ -161,6 +161,27 @@ def resolve_web_image(tag: str) -> str:
     return WEB_IMAGE
 
 
+# ─── Config profile selection (dev vs main) ───────────────────────────
+# When --tag dev or --tag main is used, override LPB_PI_REF and
+# LPB_CONFIG_REF to point to the appropriate branches.
+def _resolve_config_profile(tag: str) -> dict[str, str] | None:
+    """Return config overrides based on image tag.
+    
+    Returns None for custom tags (e.g. mybranch, sha).
+    
+    Branch mapping:
+      --tag dev    → LPB_PI_REF=lpb-dev, LPB_CONFIG_REF=dev
+      --tag main   → LPB_PI_REF=lpb,     LPB_CONFIG_REF=main
+      --tag latest → LPB_PI_REF=lpb,     LPB_CONFIG_REF=main (same as main)
+      --tag <x>    → no overrides (custom/PR images use defaults)
+    """
+    if tag == "dev":
+        return {"LPB_PI_REF": "lpb-dev", "LPB_CONFIG_REF": "dev"}
+    elif tag == "main" or tag == "latest":
+        return {"LPB_PI_REF": "lpb", "LPB_CONFIG_REF": "main"}
+    return None
+
+
 # ─── Load runtime configuration ──────────────────────────────────────────
 # lpb.conf.env defines runtime defaults (editor, browser, LLM, persistence)
 # Loaded after stack env — workspace .env overrides both.
@@ -1087,12 +1108,23 @@ def cmd_run():
     # Resolve a stable connection token (generate+persist if unset) so the URL
     # lpb prints matches the token the VSCodium server actually enforces.
     ensure_token()
+    
+    # Apply config profile overrides (dev/main branch selection)
+    profile = _resolve_config_profile(tag)
+    if profile:
+        info(f"  Config:   {tag} profile (LPB_PI_REF={profile['LPB_PI_REF']}, LPB_CONFIG_REF={profile['LPB_CONFIG_REF']})")
+    else:
+        info(f"  Config:   custom (using defaults)")
+    
     env_vars = [
         f"LPB_ED_PORT={cfg.port}",
         f"LPB_EDITOR_HOST={cfg.host}",
         f"LPB_DEVCONTAINER_WORKSPACE_DIR={mount_path}",
         f"LPB_CONNECTION_TOKEN={cfg.token}",
         f"CONNECTION_TOKEN={cfg.token}",
+        # Config profile overrides (applied based on --tag)
+        f"LPB_PI_REF={profile['LPB_PI_REF']}" if profile else "",
+        f"LPB_CONFIG_REF={profile['LPB_CONFIG_REF']}" if profile else "",
         # Note: LPB_STATE_DIR is NOT passed to the container. It's a launcher-time
         # config (lpb.py reads it to resolve the host mount source). The container
         # has no need for it — start.sh uses its own defaults. Passing it here

support/start.sh

@@ -73,10 +73,16 @@ fi
 
 # Stack identity (image names, forks, versions) — baked at build time.
 # Provides LPB_CONFIG_FORK / LPB_CONFIG_REF defaults for the clone below.
+# NOTE: Runtime env vars (-e from lpb.py) take precedence over baked values.
 _stack_env="/opt/devstack/lpb.stack.env"
 if [[ -f "${_stack_env}" ]]; then
     debug "Loading build identity from ${_stack_env}"
     while IFS= read -r _line; do
+        # Skip lines where the env var is already set (runtime override)
+        _key="${_line%%=*}"
+        if [[ -n "${!_key+x}" ]]; then
+            continue
+        fi
         export "$_line"
     done < <(parse_env_file "${_stack_env}")
 fi