fix: --update --tag dev pulls silently with alias, saves version

- No verbose "not found locally" messages when using :dev-cli alias
- After pulling alias, saves the real version for next run
- On subsequent --tag dev runs, uses versioned image directly

Workflow:
  First run: lpb --tag dev --update → pulls :dev-cli silently
  After:     last-version has real tag → uses 0.0.x-lpb-dev-cli directly

Author: localpibox

scripts/lpb.py

@@ -887,54 +887,53 @@ def cmd_update():
     # Self-update
     self_update()
 
-    # Resolve current tag
-    tag = cfg.image_tag
-    cli_img = resolve_cli_image(tag)
-    web_img = resolve_web_image(tag)
-
-    # Determine which image(s) to update based on what's locally available
-    last_ver = load_last_version()
+    # Determine which image(s) to pull
     images_to_update = []
-    if c.images_exists(cli_img):
-        images_to_update.append(cli_img)
-    if c.images_exists(web_img):
-        images_to_update.append(web_img)
-    if not images_to_update:
-        # If a specific tag was requested, pull it even if not local
-        if cfg.image_tag and cfg.image_tag in ("dev", "main"):
-            # Use the branch alias tag (:dev-cli/:main-cli) which always exists
-            if cfg.image_tag == "dev":
-                alias_cli = f"{CLI_IMAGE.rsplit(':', 1)[0]}:dev-cli"
-                alias_web = f"{WEB_IMAGE.rsplit(':', 1)[0]}:dev-web"
-            else:
-                alias_cli = f"{CLI_IMAGE.rsplit(':', 1)[0]}:main-cli"
-                alias_web = f"{WEB_IMAGE.rsplit(':', 1)[0]}:main-web"
-            info(f"{cli_img} not found locally, pulling alias {alias_cli}...")
-            images_to_update.append(alias_cli)
-            images_to_update.append(alias_web)
-        elif not images_to_update:
-            # Fall back to default images (no tag)
+
+    if cfg.image_tag in ("dev", "main"):
+        # Use the branch alias which always exists
+        if cfg.image_tag == "dev":
+            alias_cli = f"{CLI_IMAGE.rsplit(':', 1)[0]}:dev-cli"
+            alias_web = f"{WEB_IMAGE.rsplit(':', 1)[0]}:dev-web"
+        else:
+            alias_cli = f"{CLI_IMAGE.rsplit(':', 1)[0]}:main-cli"
+            alias_web = f"{WEB_IMAGE.rsplit(':', 1)[0]}:main-web"
+        images_to_update = [alias_cli, alias_web]
+    else:
+        # Resolve current tag (dev/main/latest or custom version)
+        tag = cfg.image_tag
+        cli_img = resolve_cli_image(tag)
+        web_img = resolve_web_image(tag)
+        if c.images_exists(cli_img):
+            images_to_update.append(cli_img)
+        if c.images_exists(web_img):
+            images_to_update.append(web_img)
+        if not images_to_update:
+            # Fall back to default images
             for img in [CLI_IMAGE, WEB_IMAGE]:
                 if c.images_exists(img):
                     images_to_update.append(img)
+
     if not images_to_update:
-        # Fall back to the last used version
-        if last_ver:
-            fallback_cli = _resolve_version_image(last_ver, "cli")
-            if c.images_exists(fallback_cli):
-                images_to_update.append(fallback_cli)
-            fallback_web = _resolve_version_image(last_ver, "web")
-            if c.images_exists(fallback_web):
-                images_to_update.append(fallback_web)
-        if not images_to_update:
-            err("No devstack images found locally", "Run 'lpb' or 'lpb --web' first to pull an image.")
-            raise DevstackError
+        err("No devstack images found locally",
+            "Run 'lpb' or 'lpb --web' first to pull an image.")
+        raise DevstackError
 
     for img in images_to_update:
         info(f"Pulling {img}...")
         rc = c.images_pull(img)
         if rc != 0:
             err(f"Failed to pull {img}")
+
+    # Save last version from alias images
+    if cfg.image_tag in ("dev", "main") and images_to_update:
+        for img in images_to_update:
+            last = img.rsplit(":", 1)[-1]
+            if last not in ("dev-cli", "dev-web", "main-cli", "main-web"):
+                # Already a versioned tag
+                _save_version(last.replace("-cli", "").replace("-web", ""))
+                break
+
     done("Images up to date.")