Make FetchUselessDescriptors fetch all desc types

Previously, if you were set up to use microdescriptors, and you
weren't a cache, you'd never fetch router descriptors (except for
bridges).  Now FetchUselessDescriptors causes descriptors and
mirodescs to get cached.  Also, FetchUselessDescriptors changes the
behavior of "UseMicrodescriptors auto" to be off, since there's no
point in saying "UseMicrodescriptors 1" when you have full descriptors
too.

Fix for bug 3851; bugfix on 0.2.3.1-alpha.

changes/bug3851

@@ -0,0 +1,4 @@
+  o Minor bugfixes:
+    - Make 'FetchUselessDescriptors' cause all descriptor types and
+      all consensus types get fetched. Fixes bug 3851; bugfix on
+      0.2.3.1-alpha.

src/or/microdesc.c

@@ -698,8 +698,9 @@ we_use_microdescriptors_for_circuits(const or_options_t *options)
   int ret = options->UseMicrodescriptors;
   if (ret == -1) {
     /* UseMicrodescriptors is "auto"; we need to decide: */
-    /* So we decide that we'll use microdescriptors iff we are not a server */
-    ret = ! server_mode(options);
+    /* So we decide that we'll use microdescriptors iff we are not a server,
+     * and we're not autofetching everything. */
+    ret = !server_mode(options) && !options->FetchUselessDescriptors;
   }
   return ret;
 }
@@ -710,6 +711,8 @@ we_fetch_microdescriptors(const or_options_t *options)
 {
   if (directory_caches_dir_info(options))
     return 1;
+  if (options->FetchUselessDescriptors)
+    return 1;
   return we_use_microdescriptors_for_circuits(options);
 }
 
@@ -719,6 +722,8 @@ we_fetch_router_descriptors(const or_options_t *options)
 {
   if (directory_caches_dir_info(options))
     return 1;
+  if (options->FetchUselessDescriptors)
+    return 1;
   return ! we_use_microdescriptors_for_circuits(options);
 }
 

src/or/networkstatus.c

@@ -1187,6 +1187,10 @@ we_want_to_fetch_flavor(const or_options_t *options, int flavor)
      * it ourselves. */
     return 1;
   }
+  if (options->FetchUselessDescriptors) {
+    /* In order to get all descriptors, we need to fetch all consensuses. */
+    return 1;
+  }
   /* Otherwise, we want the flavor only if we want to use it to build
    * circuits. */
   return flavor == usable_consensus_flavor();