Merge remote-tracking branch 'arma/bug19003-try2' into maint-0.2.8

changes/bug19003

@@ -0,0 +1,5 @@
+  o Minor bugfixes (small networks):
+    - Allow directories in small networks to bootstrap by
+      skipping DirPort checks when the consensus has no exits.
+      Resolves #19003, bugfix on #18050 in 0.2.8.1-alpha.
+      Patch by teor.

src/or/circuituse.c

@@ -1674,7 +1674,11 @@ circuit_launch(uint8_t purpose, int flags)
   return circuit_launch_by_extend_info(purpose, NULL, flags);
 }
 
-/* DOCDOC */
+/* Do we have enough descriptors to build paths?
+ * If need_exit is true, return 1 if we can build exit paths.
+ * (We need at least one Exit in the consensus to build exit paths.)
+ * If need_exit is false, return 1 if we can build internal paths.
+ */
 static int
 have_enough_path_info(int need_exit)
 {

src/or/router.c

@@ -1549,8 +1549,10 @@ proxy_mode(const or_options_t *options)
  * and
  * - We have ORPort set
  * and
- * - We believe both our ORPort and DirPort (if present) are reachable from
+ * - We believe our ORPort and DirPort (if present) are reachable from
  *   the outside; or
+ * - We believe our ORPort is reachable from the outside, and we can't
+ *   check our DirPort because the consensus has no exits; or
  * - We are an authoritative directory server.
  */
 static int
@@ -1568,8 +1570,15 @@ decide_if_publishable_server(void)
     return 1;
   if (!router_get_advertised_or_port(options))
     return 0;
-
+  if (!check_whether_orport_reachable())
-  return check_whether_orport_reachable() && check_whether_dirport_reachable();
+    return 0;
+  if (router_have_consensus_path() == CONSENSUS_PATH_INTERNAL) {
+    /* All set: there are no exits in the consensus (maybe this is a tiny
+     * test network), so we can't check our DirPort reachability. */
+    return 1;
+  } else {
+    return check_whether_dirport_reachable();
+  }
 }
 
 /** Initiate server descriptor upload as reasonable (if server is publishable,