Summary

The official git for windows contains a great ssh-agent, but git_cred_ssh_key_from_agent() does not seem to be able to use it. It is unclear why.

Reproduce

Once installed, git for Windows puts a special script start-ssh-agent on the PATH which will start the agent (if needed) from a windows shell and set the SSH_AUTH_SOCK and SSH_AGENT_PID variables.

Now the shell variables are set to e.g below and the git command line will use the agent.

SSH_AGENT_PID=3584
SSH_AUTH_SOCK=/tmp/ssh-lxTliF4IDExJ/agent.3520

However git_cred_ssh_key_from_agent() seems unable to connect to this. It will always errors with error authenticating: failed connecting agent.

Question

Is this expected to work at all? My libgit2 is built with the latest libssh2 using the standard gcc mingw-w64 toolchain. How can I further debug this?