feat: agent keeps SSH file sessions and runs file operations on the host by commands

internal/agent/task.go

@@ -26,6 +26,12 @@ func (a *Agent) runTask(ctx context.Context, taskID string) {
 		res = a.doFSPut(ctx, env)
 	case proto.TaskFSSend:
 		res = a.doFSSend(ctx, env)
+	case proto.TaskSSHFSSend:
+		res = a.doSSHFSSend(ctx, env)
+	case proto.TaskSSHFSPut:
+		res = a.doSSHFSPut(ctx, env)
+	case proto.TaskSSHFSOpen, proto.TaskSSHFSClose, proto.TaskSSHFSOp:
+		res = resultOf(a.sshfsTask(ctx, env))
 	case proto.TaskFSShipOut:
 		res = a.doShipOut(ctx, env)
 	case proto.TaskFSShipIn:
@@ -107,3 +113,15 @@ func itoa64(n int64) string {
 	}
 	return string(b[i:])
 }
+
+// resultOf makes a task's result of what it returned.
+func resultOf(data any, err error) proto.TaskResult {
+	if err != nil {
+		return proto.TaskResult{Error: err.Error()}
+	}
+	raw, err := json.Marshal(data)
+	if err != nil {
+		return proto.TaskResult{Error: err.Error()}
+	}
+	return proto.TaskResult{OK: true, Data: raw}
+}