A wrapper for enabling "SSH agent forwarding" for ssh command

ssh-agent-for-github.sh

#!/bin/bash

# Usage:
#   1. save this gist to some where
#   2. update your ssh command, like:
#       /path/to/ssh-agent-for-github.sh ssh -A user@your-server
#   3. you should able to access github with your ssh key now, try "ssh -T git@github.com" to confirm it

# NOTICE: you may want to change this value!
GITHUB_SSH_KEY=~/.ssh/my_github_rsa

CURRENT_DIR=$(cd "$(dirname "$0")"; pwd)
pushd "${CURRENT_DIR}" > /dev/null 2>&1

ssh_agent_started=0

if [ -f '.ssh-agent-env' ]; then
  source .ssh-agent-env
fi

if [ -n "${SSH_AGENT_PID}" ]; then
  if [ `pgrep ssh-agent | grep "${SSH_AGENT_PID}" | wc -l` = "1" ]; then
    # A valid ssh-agent has been started
    ssh_agent_started=1
  else
    echo "Process ${SSH_AGENT_PID} is not exist."
  fi
fi

if [ "${ssh_agent_started}" = "0" ]; then
  ssh-agent > .ssh-agent-env
  source .ssh-agent-env
  ssh-add -k "${GITHUB_SSH_KEY}"
  # ssh-add -l
fi

popd > /dev/null 2>&1

exec "$@"

ssh-wrapper-for-github.sh

#!/bin/bash

# This script is used to replace the ssh command in order to let you do `git commit`
# on the server without getting the "Please tell me who you are" error, by forwarding env vars.
#
# Usage:
#   1. append an AcceptEnv line to /etc/ssh/sshd_config on the server, and then restart the sshd
#       AcceptEnv GIT_AUTHOR_NAME GIT_AUTHOR_EMAIL GIT_COMMITTER_NAME GIT_COMMITTER_EMAIL
#   2. save this gist to the same place as ssh-agent-for-github.sh
#   3. update your ssh command, like:
#       /path/to/ssh-wrapper-for-github.sh user@your-server

GIT_USER=your_github_username
GIT_EMAIL=your@email.com

CURRENT_DIR=$(cd "$(dirname "$0")"; pwd)

GIT_AUTHOR_NAME="${GIT_USER}" GIT_AUTHOR_EMAIL="${GIT_EMAIL}" \
GIT_COMMITTER_NAME="${GIT_USER}" GIT_COMMITTER_EMAIL="${GIT_EMAIL}" \
"${CURRENT_DIR}"/ssh-agent-for-github.sh ssh -A -o "SendEnv=GIT_COMMITTER_*" -o "SendEnv=GIT_AUTHOR_*" "$@"