Allow agefile to be set per-repository

This adds "repo.agefile", since namespaced repositories share the same files,
and we'd like to be able to see the ages of the refs for each namespace.

Whatever the git server uses for updating the age file must be namespace aware
and must write the age file to a path consistent with "repo.agefile".

Signed-off-by: Richard Maw <richard.maw@gmail.com>

cgit.c

@@ -88,6 +88,8 @@ static void repo_config(struct cgit_repo *repo, const char *name, const char *va
 		repo->logo = xstrdup(value);
 	else if (!strcmp(name, "logo-link") && value != NULL)
 		repo->logo_link = xstrdup(value);
+	else if (!strcmp(name, "agefile") && value != NULL)
+		repo->agefile = xstrdup(value);
 	else if (!strcmp(name, "hide"))
 		repo->hide = atoi(value);
 	else if (!strcmp(name, "ignore"))

cgit.h

@@ -88,6 +88,7 @@ struct cgit_repo {
 	char *section;
 	char *clone_url;
 	char *namespace;
+	char *agefile;
 	char *logo;
 	char *logo_link;
 	int snapshots;

ui-repolist.c

@@ -42,7 +42,8 @@ static int get_repo_modtime(const struct cgit_repo *repo, time_t *mtime)
 		*mtime = repo->mtime;
 		return 1;
 	}
-	strbuf_addf(&path, "%s/%s", repo->path, ctx.cfg.agefile);
+	strbuf_addf(&path, "%s/%s", repo->path,
+	            repo->agefile ? repo->agefile : ctx.cfg.agefile);
 	if (stat(path.buf, &s) == 0) {
 		*mtime = read_agefile(path.buf);
 		if (*mtime) {