currently the link to the "README" in the tree view in the summary page
is broken because it lacks the "folder" and "commit" query parameters.
This because the summary page doesn't have these query arg, so when we
try to use them in tree_listing() (in pages.tmpl) they're unset and a
bad link is generated.

instead, fill qs->commit in the SUMMARY case, using the first commit to
avoid having to resolve refs again.

ok?

diff /home/op/w/got
commit - ae00edffd4756449c159d45b52fe67f4adf1c694
path + /home/op/w/got
blob - e8446a2194429a9db4ce01e2e0b35bb60a4745f4
file + gotwebd/gotweb.c
--- gotwebd/gotweb.c
+++ gotwebd/gotweb.c
@@ -147,6 +147,7 @@ gotweb_process_request(struct request *c)
 	struct server *srv = NULL;
 	struct querystring *qs = NULL;
 	struct repo_dir *repo_dir = NULL;
+	struct repo_commit *commit;
 	const char *rss_ctype = "application/rss+xml;charset=utf-8";
 	const uint8_t *buf;
 	size_t len;
@@ -353,6 +354,15 @@ gotweb_process_request(struct request *c)
 		error = got_get_repo_commits(c, srv->summary_commits_display);
 		if (error)
 			goto err;
+		commit = TAILQ_FIRST(&c->t->repo_commits);
+		if (commit && qs->commit == NULL) {
+			qs->commit = strdup(commit->commit_id);
+			if (qs->commit == NULL) {
+				error = got_error_from_errno("strdup");
+				log_warn("%s: strdup", __func__);
+				goto err;
+			}
+		}
 		qs->action = TAGS;
 		error = got_get_repo_tags(c, srv->summary_tags_display);
 		if (error) {
blob - 22583fa65fa1ec7208c4cc6061197077ced00de8
file + gotwebd/pages.tmpl
--- gotwebd/pages.tmpl
+++ gotwebd/pages.tmpl
@@ -672,7 +672,7 @@ nextsep(char *s, char **t)
 	url.action = BLOB;
 	url.path = t->qs->path;
 	url.file = readme;
-	url.folder = t->qs->folder;
+	url.folder = t->qs->folder ? t->qs->folder : "";
 	url.commit = t->qs->commit;
     !}
     {{ if !binary }}