hugolib: Do not set RSS as Kind in RSS output

Before Hugo this commit  we set the pseudo page kind RSS on the page when output to RSS. This had some unintended side effects, esp. when the only output format for that page  was RSS.

For the page kinds that can have multiple output formats, the Kind should be one of the standard home, page etc.

Fixes gohugoio#5138

hugolib/rss_test.go

@@ -57,3 +57,21 @@ func TestRSSOutput(t *testing.T) {
 		t.Errorf("incorrect RSS item count: expected %d, got %d", rssLimit, c)
 	}
 }
+
+// Before Hugo 0.49 we set the pseudo page kind RSS on the page when output to RSS.
+// This had some unintended side effects, esp. when the only output format for that page
+// was RSS.
+// For the page kinds that can have multiple output formats, the Kind should be one of the
+// standard home, page etc.
+// This test has this single purpose: Check that the Kind is that of the source page.
+// See https://github.com/gohugoio/hugo/issues/5138
+func TestRSSKind(t *testing.T) {
+	t.Parallel()
+
+	b := newTestSitesBuilder(t)
+	b.WithSimpleConfigFile().WithTemplatesAdded("index.rss.xml", `RSS Kind: {{ .Kind }}`)
+
+	b.Build(BuildCfg{})
+
+	b.AssertFileContent("public/index.xml", "RSS Kind: home")
+}

hugolib/site_render.go

@@ -248,8 +248,6 @@ func (s *Site) renderRSS(p *PageOutput) error {
 		return nil
 	}
 
-	p.Kind = kindRSS
-
 	limit := s.Cfg.GetInt("rssLimit")
 	if limit >= 0 && len(p.Pages) > limit {
 		p.Pages = p.Pages[:limit]