RuntimeError: SSH connection failed: unix_listener: path "/var/folders/2t/wbkw5yb158jc3zhswgl7tz9c0000gn/T/hermes-ssh/hermes@9373:9b91:4480:558d:708e:e601:24e8:d8d0:22.sock.O4Mllpst3K7uFRmH" too long for Unix domain socket

TL;DR

Use a shortened socket path, such as a hash of the connection parameters, to avoid exceeding the 104-character Unix domain socket path limit on macOS.

Guidance

• Identify the source of the long socket path in the SSHEnvironment class, specifically the line where the control_socket path is generated.
• Consider using a hash function like hashlib to shorten the socket path, as proposed in the issue.
• Verify that the new socket path is within the 104-character limit by logging or printing the path before attempting to use it.
• Test the modified SSHEnvironment class with an IPv6 address to ensure that the issue is resolved.

Example

import hashlib

# In __init__:
socket_id = hashlib.sha256(f"{user}@{host}:{port}".encode()).hexdigest()[:12]
self.control_socket = self.control_dir / f"{socket_id}.sock"

Notes

This fix assumes that the issue is solely caused by the long socket path and that shortening it will resolve the problem. However, additional testing may be necessary to ensure that the shortened path does not introduce other issues, such as socket path collisions.

Recommendation

Apply the proposed workaround using a hash of the connection parameters to shorten the socket path, as it is a straightforward and effective solution to the problem.