feat(installer): add update helper script

- Python script checks for updates and download the latest installer if requested
- Add `packaging` to deps (we only have it as an indirect dep)

invokeai/frontend/install/update_helper.py

@@ -0,0 +1,73 @@
+"""
+- Checks GitHub releases for updates, displaying any updates
+- If the user chooses to update, downloads the latest installer and unzips it to the dir provide as an arg
+"""
+
+import argparse
+import re
+import shutil
+from pathlib import Path
+
+import requests
+from packaging.version import Version
+
+from invokeai.version.invokeai_version import __version__ as invokeai_version
+
+
+def check_for_updates(install_temp_dir: str) -> None:
+    current_version = Version(invokeai_version)
+    print(f"Current version: v{current_version}")
+    print("Checking for updates... ", end="")  # no trailing newline
+
+    response = requests.get("https://api.github.com/repos/invoke-ai/InvokeAI/releases")
+    response.raise_for_status()
+    req_json = response.json()
+
+    latest_release = [r for r in req_json if not r["prerelease"]][0]
+    latest_release_version = Version(latest_release["tag_name"])
+    is_release_available = current_version < latest_release_version
+
+    latest_prerelease = [r for r in req_json if r["prerelease"]][0]
+    latest_prerelease_version = Version(latest_prerelease["tag_name"])
+    is_prerelease_available = current_version < latest_prerelease_version
+
+    if not is_release_available and not is_prerelease_available:
+        print("up to date!")
+    else:
+        print("updates available:")
+        if is_release_available:
+            print(f"- New release: v{latest_release_version}")
+        if is_prerelease_available:
+            print(f"- New pre-release: v{latest_prerelease_version}")
+
+    prompt_msg = "\nDo you want to run the updater? You may select a version to update to or reinstall the current version. (y/n) [y]: "
+    response = input(prompt_msg).lower()
+
+    if response == "" or response == "y":
+        # Get the installer asset from the latest release - the asset name is InvokeAI-installer-*.zip
+        # TODO: It's possible that the prerelease installer is different from the release installer, but in an effort
+        # to keep this simple, we will always use the release installer...
+        installer_asset = next(
+            (a for a in latest_release["assets"] if re.match(r"InvokeAI-installer.*zip", a["name"], re.IGNORECASE))
+        )
+        download_url = installer_asset["browser_download_url"]
+        # Download & unzip the installer (it's only a few KB)
+        install_temp_path = Path(install_temp_dir, "installer.zip")
+        install_temp_path.parent.mkdir(exist_ok=True)
+        response = requests.get(download_url, stream=True)
+        response.raise_for_status()
+        with open(install_temp_path, "wb") as f:
+            for chunk in response.iter_content(chunk_size=8192):
+                f.write(chunk)
+        shutil.unpack_archive(install_temp_path, install_temp_path.parent)
+
+
+def main() -> None:
+    parser = argparse.ArgumentParser()
+    parser.add_argument("install_temp_dir", type=str, help="Path to write the release URL to")
+    args = parser.parse_args()
+    check_for_updates(args.install_temp_dir)
+
+
+if __name__ == "__main__":
+    main()

pyproject.toml

@@ -76,6 +76,7 @@ dependencies = [
   "matplotlib",                            # needed for plotting of Penner easing functions
   "npyscreen",
   "omegaconf",
+  "packaging",                             # used by launcher to update
   "picklescan",
   "pillow",
   "prompt-toolkit",
@@ -126,6 +127,7 @@ dependencies = [
 
 [project.scripts]
 "invokeai-web" = "invokeai.app.run_app:run_app"
+"invokeai-update-helper" = "invokeai.frontend.install.update_helper:main"
 "invokeai-import-images" = "invokeai.frontend.install.import_images:main"
 "invokeai-db-maintenance" = "invokeai.backend.util.db_maintenance:main"