Permissions 0664 for '/home/hoge/.ssh/id_rsa' are too open. It is required that your private key files are NOT accessible by others. This private key will be ignored. Load key "/home/hoge/.ssh/id_rsa": bad permissions Permission denied (publickey). fatal: Could not read from remote repository. Please make sure you have the correct access rights and the repository exists.
$ chmod 600 ~/.ssh/id_rsa