is_release_required() function

.gitignore

@@ -1,2 +1,2 @@
 dist
-
+latest_dl

release_updater.py

@@ -0,0 +1,75 @@
+import hashlib
+import shutil
+from pathlib import Path
+from urllib.request import urlretrieve
+
+import requests
+
+from build import main as build_main
+
+
+def get_file_sha256(file_path):
+    """Calculates the SHA256 hash of a file.
+
+    Args:
+        file_path: The path to the file.
+
+    Returns:
+        The SHA256 hash of the file as a hexadecimal string.
+    """
+    sha256_hash = hashlib.sha256()
+    try:
+        with open(file_path, "rb") as f:
+            for chunk in iter(lambda: f.read(4096), b""):
+                sha256_hash.update(chunk)
+    except FileNotFoundError:
+        return "File not found."
+    return sha256_hash.hexdigest()
+
+
+def is_release_required():
+    """
+    Checks if there are new versions of any apps. When new versions exist
+    a new release is required.
+
+    :return: True if there are new versions of any apps, and release is required, False otherwise.
+    """
+
+    try:
+        dl_dir = Path("latest_dl")
+        if dl_dir.exists():
+            shutil.rmtree("latest_dl")
+        dl_dir.mkdir()
+    except FileExistsError:
+        pass
+
+    # download built zips from most recent release
+    RELEASE_API_URL = "https://api.github.com/repos/adafruit/Fruit-Jam-OS/releases?per_page=1"
+    latest_release_obj = requests.get(RELEASE_API_URL).json()[0]
+    for asset in latest_release_obj["assets"]:
+        asset_dl_url = asset["browser_download_url"]
+        asset_filename = asset_dl_url.split("/")[-1]
+        urlretrieve(asset_dl_url, f"latest_dl/{asset_filename}")
+
+    # get sha256 hashes for each downloaded zip
+    downloaded_file_hashes = {}
+    for dl_file in Path("latest_dl").iterdir():
+        downloaded_file_hashes[dl_file.name] = get_file_sha256(dl_file)
+
+    # make a local build
+    build_main()
+
+    # get sha256 hashes for built zips
+    dist_file_hashes = {}
+    for dist_file in Path("dist").iterdir():
+        dist_file_hashes[dist_file.name] = get_file_sha256(dist_file)
+
+    # compare hashes
+    if dist_file_hashes != downloaded_file_hashes:
+        print("Zip hashes differ, a release is required.")
+        return True
+    return False
+
+
+if __name__ == '__main__':
+    is_release_required()