clarify pruned bundle message

Signed-off-by: Ankita Thomas <ankithom@redhat.com>

Author: ankitathomas

pkg/lib/registry/registry.go

@@ -425,7 +425,11 @@ func checkForBundles(ctx context.Context, q *sqlite.SQLQuerier, g registry.Graph
 					errs = append(errs, fmt.Errorf("could not validate pruned bundle %s (%s) as deprecated: %v", bundle.CsvName, bundle.BundlePath, err))
 				}
 				if !deprecated {
-					errs = append(errs, fmt.Errorf("added bundle %s pruned from package %s, channel %s: this may be due to incorrect channel head (%s)", bundle.BundlePath, pkg.Name, channel, graph.Channels[channel].Head.CsvName))
+					headSkips := []string{}
+					for b := range graph.Channels[channel].Nodes[graph.Channels[channel].Head] {
+						headSkips = append(headSkips, b.CsvName)
+					}
+					errs = append(errs, fmt.Errorf("add prunes bundle %s (%s, %s) from package %s, channel %s: this may be due to incorrect channel head (%s, skips/replaces %v)", bundle.CsvName, bundle.Version, bundle.BundlePath, pkg.Name, channel, graph.Channels[channel].Head.CsvName, headSkips))
 				}
 			}
 		}

pkg/lib/registry/registry_test.go

@@ -444,7 +444,7 @@ func TestCheckForBundles(t *testing.T) {
 					},
 				},
 			},
-			wantErr: fmt.Errorf("added bundle unorderedReplaces-1.0.0 pruned from package testpkg, channel stable: this may be due to incorrect channel head (unorderedReplaces-1.1.0)"),
+			wantErr: fmt.Errorf("add prunes bundle unorderedReplaces-1.0.0 (1.0.0, unorderedReplaces-1.0.0) from package testpkg, channel stable: this may be due to incorrect channel head (unorderedReplaces-1.1.0, skips/replaces [])"),
 		},
 		{
 			description: "ignoreDeprecated",