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.
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					 5 changed files with 19 additions and 1 deletions
				
			
		|  | @ -167,6 +167,7 @@ int main (int argc, char * * argv) | |||
|                         storeParams["ssh-key"] = bestMachine->sshKey; | ||||
| 
 | ||||
|                     sshStore = openStore(bestMachine->storeUri, storeParams); | ||||
|                     sshStore->connect(); | ||||
|                     storeUri = bestMachine->storeUri; | ||||
| 
 | ||||
|                 } catch (std::exception & e) { | ||||
|  |  | |||
|  | @ -262,6 +262,11 @@ struct LegacySSHStore : public Store | |||
| 
 | ||||
|         return readStorePaths<PathSet>(*this, conn->from); | ||||
|     } | ||||
| 
 | ||||
|     void connect() override | ||||
|     { | ||||
|         auto conn(connections->get()); | ||||
|     } | ||||
| }; | ||||
| 
 | ||||
| static RegisterStoreImplementation regStore([]( | ||||
|  |  | |||
|  | @ -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 { | ||||
|  |  | |||
|  | @ -92,6 +92,8 @@ public: | |||
|         PathSet & willBuild, PathSet & willSubstitute, PathSet & unknown, | ||||
|         unsigned long long & downloadSize, unsigned long long & narSize) override; | ||||
| 
 | ||||
|     void connect() override; | ||||
| 
 | ||||
| protected: | ||||
| 
 | ||||
|     struct Connection | ||||
|  |  | |||
|  | @ -582,6 +582,10 @@ public: | |||
|         state.lock()->pathInfoCache.clear(); | ||||
|     } | ||||
| 
 | ||||
|     /* Establish a connection to the store, for store types that have
 | ||||
|        a notion of connection. Otherwise this is a no-op. */ | ||||
|     virtual void connect() { }; | ||||
| 
 | ||||
| protected: | ||||
| 
 | ||||
|     Stats stats; | ||||
|  |  | |||
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