From b409837b70a65a448399464c7dd256bea331ac63 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bastian=20K=C3=B6cher?= <bkchr@users.noreply.github.com>
Date: Thu, 23 Dec 2021 20:27:03 +0100
Subject: [PATCH] Fix checking for the `ParachainHost` runtime api (#4594)

The function `has_api` checks that the api + version matches, which
isn't true anymore after bumping the version. The fix is to just compare
the runtime api version being at least `1`.
---
 polkadot/node/overseer/src/lib.rs | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/polkadot/node/overseer/src/lib.rs b/polkadot/node/overseer/src/lib.rs
index 9321fad7a4..36ffe54240 100644
--- a/polkadot/node/overseer/src/lib.rs
+++ b/polkadot/node/overseer/src/lib.rs
@@ -130,7 +130,13 @@ where
 {
 	fn head_supports_parachains(&self, head: &Hash) -> bool {
 		let id = BlockId::Hash(*head);
-		self.runtime_api().has_api::<dyn ParachainHost<Block>>(&id).unwrap_or(false)
+		// Check that the `ParachainHost` runtime api is at least with version 1 present on chain.
+		self.runtime_api()
+			.api_version::<dyn ParachainHost<Block>>(&id)
+			.ok()
+			.flatten()
+			.unwrap_or(0) >=
+			1
 	}
 }