Allow disabling GitHub download mirrors (#320)

scripts/dev/check-download-mirror-priority.sh

@@ -16,6 +16,7 @@ mkdir -p "$RUNTIME_DIR"
 unset CLASH_GH_PROXY
 unset URL_GH_PROXY
 unset CLASH_GH_PROXY_POOL
+unset CLASH_GH_PROXY_ENABLED
 
 url="https://github.com/MetaCubeX/meta-rules-dat/releases/download/latest/country.mmdb"
 ordered_entries="$(
@@ -40,3 +41,43 @@ if [ "$last_label" != "origin" ]; then
 fi
 
 echo "ok - default GitHub downloads prefer mirrors before origin"
+
+CLASH_GH_PROXY="https://mirror.example.com"
+CLASH_GH_PROXY_POOL="custom|https://pool.example.com|full"
+CLASH_GH_PROXY_ENABLED="false"
+ordered_entries="$(
+  github_mirror_candidate_entries_ordered "$url" \
+    | sort -t'|' -k1,1nr \
+    | cut -d'|' -f2-
+)"
+
+if [ "$ordered_entries" != "origin||origin" ]; then
+  echo "not ok - disabled GitHub mirrors: expected only origin" >&2
+  printf '%s\n' "$ordered_entries" >&2
+  exit 1
+fi
+
+origin_url="$(build_github_mirror_url "$ordered_entries" "$url")"
+if [ "$origin_url" != "$url" ]; then
+  echo "not ok - disabled GitHub mirrors: origin URL changed to $origin_url" >&2
+  exit 1
+fi
+
+echo "ok - disabled GitHub mirrors use only origin"
+
+CLASH_GH_PROXY_ENABLED="true"
+unset CLASH_GH_PROXY_POOL
+ordered_entries="$(
+  github_mirror_candidate_entries_ordered "$url" \
+    | sort -t'|' -k1,1nr \
+    | cut -d'|' -f2-
+)"
+first_entry="$(printf '%s\n' "$ordered_entries" | head -n 1)"
+
+if [ "$first_entry" != "custom|https://mirror.example.com|full" ]; then
+  echo "not ok - enabled custom GitHub mirror was not preferred" >&2
+  printf '%s\n' "$ordered_entries" >&2
+  exit 1
+fi
+
+echo "ok - enabled custom GitHub mirror remains preferred"