Rewrite download_hash in Python (#5995)

- Directly update the main.yml file with the new hashes.

scripts/download_hash.py

+#!/usr/bin/env python3
+
+# After a new version of Kubernetes has been released,
+# run this script to update roles/download/defaults/main.yml
+# with new hashes.
+
+import hashlib
+import sys
+
+import requests
+from ruamel.yaml import YAML
+
+MAIN_YML = "../roles/download/defaults/main.yml"
+
+def open_main_yaml():
+    yaml = YAML()
+    yaml.explicit_start = True
+    yaml.preserve_quotes = True
+    yaml.width = 4096
+
+    with open(MAIN_YML, "r") as main_yml:
+        data = yaml.load(main_yml)
+
+    return data, yaml
+
+
+def download_hash(versions):
+    architectures = ["arm", "arm64", "amd64"]
+    downloads = ["kubelet", "kubectl", "kubeadm"]
+
+    data, yaml = open_main_yaml()
+
+    for download in downloads:
+        checksum_name = f"{download}_checksums"
+        for arch in architectures:
+            for version in versions:
+                if not version.startswith("v"):
+                    version = f"v{version}"
+                url = f"https://storage.googleapis.com/kubernetes-release/release/{version}/bin/linux/{arch}/{download}"
+                download_file = requests.get(url, allow_redirects=True)
+                download_file.raise_for_status()
+                sha256sum = hashlib.sha256(download_file.content).hexdigest()
+                data[checksum_name][arch][version] = sha256sum
+
+    with open(MAIN_YML, "w") as main_yml:
+        yaml.dump(data, main_yml)
+        print(f"\n\nUpdated {MAIN_YML}\n")
+
+
+def usage():
+    print(f"USAGE:\n    {sys.argv[0]} [k8s_version1] [[k8s_version2]....[k8s_versionN]]")
+
+
+def main(argv=None):
+    if not argv:
+        argv = sys.argv[1:]
+    if not argv:
+        usage()
+        sys.exit(1)
+    download_hash(argv)
+
+
+if __name__ == "__main__":
+    sys.exit(main())