Switch git context in shell

gitswitcher.sh

#!/bin/bash

# Configuration files
TEMP_CONFIG="/tmp/gitswitchrc"
ALT_SSH_CONF="$HOME/.ssh/id_rsa_gitswitch"
BASHRC="$HOME/.bashrc"

# PS1 prompt pre-text
# Places some text behind your command prompt to give
# a context clue that you are within another GIT context.
# This must be configured in your .bashrc
# Example:
#   export PS1="$PRE_PS1 $PS1"
PRE_PS1="[context-git]"

# Git Configuration
GIT_NAME="your_git_username"
GIT_EMAIL="your_email@gmail.com"

# Generate an ssh key for gitswitch if it doesn't exist
if [ ! -f "$ALT_SSH_CONF" ]; then
    echo "Could not find public key for gitswitch creating one ..."
    ssh-keygen -t rsa -f "$ALT_SSH_CONF"
fi

# Write a temporary bash config file that:
#
#    * overrides the git environment variables
#    * creates a new ssh-agent with the gitswitch key
#    * prepends $PRE_PS1 to the PS1 prompt
#    * adds a function called kill_ssh_agent and binds
#      it to control-a that kills the ssh-agent and
#      exits this prompt
#
cat <<EOF > $TEMP_CONFIG
eval `ssh-agent -s `
ssh-add $ALT_SSH_CONF

source $BASHRC
export EMAIL="$GIT_EMAIL"
export GIT_COMMITTER_NAME="$GIT_NAME"
export GIT_COMMITTER_EMAIL="$GIT_EMAIL"
export GIT_AUTHOR_NAME="$GIT_NAME"
export GIT_AUTHOR_EMAIL="$GIT_EMAIL"
export PRE_PS1="$PRE_PS1 "

function kill_ssh_agent() {
    echo "Exiting ALGIT"
    kill -9 \$SSH_AGENT_PID
    exit
}

bind -x '"\C-a": kill_ssh_agent'
EOF

exec bash --rcfile $TEMP_CONFIG