attestation: retry on InvalidAttestationError instead

Library/Homebrew/attestation.rb

@@ -179,6 +179,8 @@ def self.check_attestation(bottle, signing_repo, signing_workflow = nil, subject
       attestation
     end
 
+    ATTESTATION_MAX_RETRIES = 5
+
     # Verifies the given bottle against a cryptographic attestation of build provenance
     # from homebrew-core's CI, falling back on a "backfill" attestation for older bottles.
     #
@@ -246,12 +248,15 @@ def self.check_core_attestation(bottle)
       end
 
       backfill_attestation
-    rescue InvalidAttestationError => e
-      raise if ENV["HOMEBREW_GITHUB_ACTIONS"].blank?
-
-      opoo "Attestation verification failed (please verify that this is not a network error before rebottling): #{e}"
-
-      {}
+    rescue InvalidAttestationError
+      @attestation_retry_count ||= T.let(Hash.new(0), T.nilable(T::Hash[Bottle, Integer]))
+      raise if @attestation_retry_count[bottle] >= ATTESTATION_MAX_RETRIES
+
+      sleep_time = 3 ** @attestation_retry_count[bottle]
+      opoo "Failed to verify attestation. Retrying in #{sleep_time}..."
+      sleep sleep_time
+      @attestation_retry_count[bottle] += 1
+      retry
     end
   end
 end