.ssh_agent

#!/bin/bash

# Get fingerprints of all keys currently loaded in the ssh-agent
loaded_keys=$(ssh-add -l | awk '{print $2}')

# Export loaded_keys for access within subshell invoked by find ... -exec
export loaded_keys

if [ -z "$loaded_keys" ]; then
    echo "No SSH keys are currently loaded in the ssh-agent."
    # If you want to proceed to check and potentially load keys, don't exit here
fi

echo "Comparing loaded SSH keys with keys in ~/.ssh..."

# Process each public key in the ~/.ssh directory
find ~/.ssh -name "*.pub" -exec bash -c '
    for pub_key_path; do
        # Extract the fingerprint of the current public key, considering removal of the MD5 prefix for consistency
        fingerprint=$(ssh-keygen -l -f "$pub_key_path" | awk "{print \$2}" | sed -e "s/MD5://")

        # Use the exported loaded_keys within this subshell context
        if echo "${loaded_keys}" | grep -q "$fingerprint"; then
            echo "Public key $pub_key_path is already loaded."
        else
            echo "Public key $pub_key_path is NOT loaded. Attempting to load corresponding private key..."
            private_key_path="${pub_key_path%.*}"
            if [ -f "$private_key_path" ]; then
                if ssh-add "$private_key_path" &> /dev/null; then
                    echo "Loaded $private_key_path into ssh-agent."
                else
                    echo "Failed to load $private_key_path. Check if ssh-agent is running and if the key is password protected."
                fi
            else
                echo "Corresponding private key $private_key_path not found."
            fi
        fi
    done
' bash {} +