Improve SSH handling

* Unify SSH code in SSHStore and LegacySSHStore.

* Fix a race starting the SSH master. We now wait synchronously for
  the SSH master to finish starting. This prevents the SSH clients
  from starting their own connections.

* Don't use a master if max-connections == 1.

* Add a "max-connections" store parameter.

* Add a "compress" store parameter.

1 files changed, 6 insertions, 1 deletions

diff --git a/src/libutil/pool.hh b/src/libutil/pool.hh
index f291cd578388..3c3dd4b074f3 100644
--- a/src/libutil/pool.hh
+++ b/src/libutil/pool.hh
@@ -141,11 +141,16 @@ public:
         }
     }
 
-    unsigned int count()
+    size_t count()
     {
         auto state_(state.lock());
         return state_->idle.size() + state_->inUse;
     }
+
+    size_t capacity()
+    {
+        return state.lock()->max;
+    }
 };
 
 }