nomad_ssh.md

You can manage temporary SSH configurations without touching your ~/.ssh directory at all by using a completely separate temporary directory and leveraging the -F option with ssh along with the GIT_SSH_COMMAND environment variable.

Here's how:

1. Create a temporary directory outside of ~/.ssh. For example:

mkdir -p /tmp/my_temp_ssh

2. Generate your temporary SSH key pair in this directory:

ssh-keygen -t ed25519 -f /tmp/my_temp_ssh/temp_key

3. Add the public key (/tmp/my_temp_ssh/temp_key.pub) to your GitHub account.

4. Create a temporary SSH config file within your temporary directory:

Host github_temp
    HostName github.com
    User git
    IdentityFile /tmp/my_temp_ssh/temp_key

Save this configuration into a file named, for example, /tmp/my_temp_ssh/temp_config.

5. Use GIT_SSH_COMMAND with the full path to your temporary config file:

GIT_SSH_COMMAND="ssh -F /tmp/my_temp_ssh/temp_config" git push

Or, for multiple Git commands within the same session:

export GIT_SSH_COMMAND="ssh -F /tmp/my_temp_ssh/temp_config"
git push
# other git commands…
unset GIT_SSH_COMMAND

6. Clean up. When finished, delete the temporary directory:

rm -rf /tmp/my_temp_ssh

This approach ensures that your ~/.ssh directory remains untouched, providing complete isolation for your temporary SSH configuration. Remember to adapt paths if you choose a different location for your temporary files.