From 054b467f328e38a70d65a30199ab54843364a0be Mon Sep 17 00:00:00 2001
From: Nick Craig-Wood <nick@craig-wood.com>
Date: Tue, 18 May 2021 16:20:17 +0100
Subject: [PATCH] check: log the hash in use like cryptcheck does

See: https://forum.rclone.org/t/does-a-rclone-check-on-similar-remotes-still-compute-hashes/24288/15
---
 cmd/check/check.go | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/cmd/check/check.go b/cmd/check/check.go
index 505aa6fe5..11117b147 100644
--- a/cmd/check/check.go
+++ b/cmd/check/check.go
@@ -9,6 +9,7 @@ import (
 	"github.com/rclone/rclone/cmd"
 	"github.com/rclone/rclone/fs"
 	"github.com/rclone/rclone/fs/config/flags"
+	"github.com/rclone/rclone/fs/hash"
 	"github.com/rclone/rclone/fs/operations"
 	"github.com/spf13/cobra"
 	"github.com/spf13/pflag"
@@ -156,6 +157,12 @@ to check all the data.
 			if download {
 				return operations.CheckDownload(context.Background(), opt)
 			}
+			hashType := fsrc.Hashes().Overlap(fdst.Hashes()).GetOne()
+			if hashType == hash.None {
+				fs.Errorf(nil, "No common hash found - not using a hash for checks")
+			} else {
+				fs.Infof(nil, "Using %v for hash comparisons", hashType)
+			}
 			return operations.Check(context.Background(), opt)
 		})
 	},