Why Am I Getting \'Incorrect Signature Type\' and Git Branch Errors in CircleCI with Go Projects?

Incorrect Signature Type Warning and Git Branch Error

CircleCI users with Go projects on GitHub may encounter an error unrelated to their code upon using the default ".circleci/config.yml" template. This error includes the message:

agent key RSA SHA256: ... returned incorrect signature type

Incorrect Signature Type Warning

This warning indicates an issue with the SSH agent's signature type during SSH connection negotiation. While not inherently fatal, the remote server may reject the connection if it does not support SHA-1 signatures.

The warning occurs because the SSH connection negotiated an RSA key with a different signature algorithm (SHA-256 or SHA-512), but the SSH agent provided an SHA-1 signature, which violates the agent protocol.

Git Branch Error

The second error message, originating from Git, indicates that a git pull command is being attempted without a remote configured for the branch. This typically occurs when using go get on an existing repository, which attempts to update the repository.

Troubleshooting

Incorrect Signature Type Warning:

• Check if the SSH agent is configured correctly and supports the required signature algorithm.
• Update the SSH agent to a version that supports the correct hashing algorithm.

Git Branch Error:

• Specify the remote branch from which to pull when using git pull.
• If using go get for dependency installation, consider using go build instead, as it will automatically fetch dependencies without the need for git pull.
• For more complex dependency management, use Git itself rather than go get.

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