resource/bundler: Improve error message

diff --git a/resource/bundler/bundler.go b/resource/bundler/bundler.go
index b9cd718dbe058187176f9fc5ba7af1b6518417be..4b1718b0d82dc9499b490789f854558b6e68ca65 100644 (file)
--- a/resource/bundler/bundler.go
+++ b/resource/bundler/bundler.go
@@ -15,7 +15,6 @@
 package bundler
 
 import (
-       "errors"
        "fmt"
        "io"
        "path/filepath"
@@ -71,7 +70,7 @@ func (c *Client) Concat(targetPath string, resources resource.Resources) (resour
                // We may improve on that in the future, but then we need to know more.
                for i, r := range resources {
                        if i > 0 && r.MediaType().Type() != resolvedm.Type() {
-                               return nil, errors.New("resources in Concat must be of the same Media Type")
+                               return nil, fmt.Errorf("resources in Concat must be of the same Media Type, got %q and %q", r.MediaType().Type(), resolvedm.Type())
                        }
                        resolvedm = r.MediaType()
                }