download: allow excluding some component

This is handy when some component releases is buggy (missing file at the
download links) to not block everything else.

Move the filtering up the stack so we don't have to do it multiples
times.

scripts/component_hash_update/src/component_hash_update/download.py

@@ -21,7 +21,7 @@ from packaging.version import Version, InvalidVersion
 from importlib.resources import files
 from pathlib import Path
 
-from typing import Optional
+from typing import Optional, Any
 
 CHECKSUMS_YML = Path("roles/kubespray-defaults/defaults/main/checksums.yml")
 
@@ -148,7 +148,7 @@ arch_alt_name = {
 # different verification methods (gpg, cosign) ( needs download role changes) (or verify the sig in this script and only use the checksum in the playbook)
 # perf improvements (async)
 
-def download_hash(only_downloads: [str]) -> None:
+def download_hash(downloads: {str: {str: Any}}) -> None:
     # Handle file with multiples hashes, with various formats.
     # the lambda is expected to produce a dictionary of hashes indexed by arch name
     download_hash_extract = {
@@ -203,10 +203,7 @@ def download_hash(only_downloads: [str]) -> None:
         return download_hash_extract[download](hash_file.content.decode())
 
 
-    releases, tags = map(dict,
-                         partition(lambda r: r[1].get('tags', False),
-                                    {k: downloads[k] for k in (downloads.keys() & only_downloads)}.items()
-                                   ))
+    releases, tags = map(dict, partition(lambda r: r[1].get('tags', False), downloads.items()))
     ql_params = {
         'repoWithReleases': [r['graphql_id'] for r in releases.values()],
         'repoWithTags': [t['graphql_id'] for t in tags.values()],
@@ -353,8 +350,25 @@ def main():
           1.28.0: 8dc78774f7cbeaf787994d386eec663f0a3cf24de1ea4893598096cb39ef2508"""
 
     )
-    parser.add_argument('binaries', nargs='*', choices=downloads.keys(),
-                        help='if provided, only obtain hashes for these compoments')
+
+    # Workaround for https://github.com/python/cpython/issues/53834#issuecomment-2060825835
+    # Fixed in python 3.14
+    class Choices(tuple):
+
+        def __init__(self, _iterable=None, default=None):
+            self.default = default or []
+
+        def __contains__(self, item):
+            return super().__contains__(item) or item == self.default
+
+    choices = Choices(downloads.keys(), default=list(downloads.keys()))
+
+    parser.add_argument('only', nargs='*', choices=choices,
+                        help='if provided, only obtain hashes for these compoments',
+                        default=choices.default)
+    parser.add_argument('-e', '--exclude', action='append', choices=downloads.keys(),
+                        help='do not obtain hashes for this component',
+                        default=[])
 
     args = parser.parse_args()
-    download_hash(args.binaries)
+    download_hash({k: downloads[k] for k in (set(args.only) - set(args.exclude))})