build-remote: Fix fallback to other machines when connecting fails

Opening an SSHStore or LegacySSHStore does not actually establish a
connection, so the try/catch block here did nothing. Added a
Store::connect() method to test whether a connection can be
established.

1 files changed, 7 insertions, 1 deletions

diff --git a/src/libstore/remote-store.cc b/src/libstore/remote-store.cc
index af59d51106fc..be8819bbc004 100644
--- a/src/libstore/remote-store.cc
+++ b/src/libstore/remote-store.cc
@@ -100,7 +100,7 @@ ref<RemoteStore::Connection> UDSRemoteStore::openConnection()
         throw Error(format("socket path ‘%1%’ is too long") % socketPath);
     strcpy(addr.sun_path, socketPath.c_str());
 
-    if (connect(conn->fd.get(), (struct sockaddr *) &addr, sizeof(addr)) == -1)
+    if (::connect(conn->fd.get(), (struct sockaddr *) &addr, sizeof(addr)) == -1)
         throw SysError(format("cannot connect to daemon at ‘%1%’") % socketPath);
 
     conn->from.fd = conn->fd.get();
@@ -613,6 +613,12 @@ void RemoteStore::queryMissing(const PathSet & targets,
 }
 
 
+void RemoteStore::connect()
+{
+    auto conn(connections->get());
+}
+
+
 RemoteStore::Connection::~Connection()
 {
     try {