Add remote to a git repository and configure it for SSH

Add remote to a git repository and configure it for SSH.md

Purpose

This script is useful when you have multiple SSH keys on your system, eventually having several SSH keys tied to different accounts for the same domain.

It makes use of the core.sshCommand git configuration directive to assign a specific SSH key to a repository.

Requirements

The script will look for SSH keys in ~/.ssh

You'll also need bash and git installed on your system.

Installation

From the Terminal, move to the directory you want to install this script (I recommend a directory with your $PATH environment variable) and execute those commands:

wget https://gist.githubusercontent.com/chsxf/6d6aad6e8bf8993cc16db60f82da319d/raw/garssh
chmod +x garssh

Usage

garssh <repository_ssh_uri>

The script will then guide you through the process.

garssh

#!/bin/bash

# Color ANSI escape codes:
# https://stackoverflow.com/a/5947802
WHITE="\033[1;37m"
RED="\033[0;31m"
RESET_COLOR="\033[0m"

if [ $# -ne 1 ]; then
	echo -e "${RED}Invalid argument count${RESET_COLOR}\n"

	echo "Usage:"
	echo -e "\tgarssh repository_uri"

	exit 1
fi

GIT_URI=$1

echo -e "${WHITE}Please answer those questions in order to add another remote to your repository with SSH"
echo -e "Repository URI: ${GIT_URI}${RESET_COLOR}\n"

CWD=`pwd`
cd ~/.ssh
KEYS=`ls -1 *.pub`
cd "${CWD}"

COUNTER=0
echo "Select the SSH to use with your repository:"
for entry in $KEYS
do
	[[ $entry =~ ^(.+)\.pub$ ]];
	((COUNTER=COUNTER+1))
	echo -e "\t$COUNTER. ${BASH_REMATCH[1]}"
done

read -p "Key #: " KEY_INDEX

if [[ $KEY_INDEX =~ ^[1-9]\d*$ && $KEY_INDEX -le $COUNTER ]]; then
	((SELECTED_INDEX=$KEY_INDEX-1))
	ARR=($KEYS)
	[[ ${ARR[$SELECTED_INDEX]} =~ ^(.+)\.pub$ ]];
	SELECTED_KEY=${BASH_REMATCH[1]}
	echo -e "${WHITE}Selected key: ${SELECTED_KEY}${RESET_COLOR}"
else
	echo -e "${RED}Invalid key${RESET_COLOR}"
	exit 2
fi

echo ""

[[ $GIT_URI =~ /(.+).git$ ]];
DEFAULT_REMOTE=origin
read -p "New remote name (default: ${DEFAULT_REMOTE}): " GIT_REMOTE

CURRENT_GIT_USERNAME=`git config user.name`
read -p "User name for the repository (current: ${CURRENT_GIT_USERNAME}): " GIT_USERNAME

CURRENT_GIT_USEREMAIL=`git config user.email`
read -p "User email for the repository (current: ${CURRENT_GIT_USEREMAIL}): " GIT_USEREMAIL

echo ""
echo -e "${WHITE}Adding remote in ..."
for i in {5..1}
do
	echo $i
	sleep 1
done
echo -e "${RESET_COLOR}"

if [[ -z $GIT_REMOTE ]]; then
	NEW_GIT_REMOTE=$DEFAULT_REMOTE
else
	NEW_GIT_REMOTE=$GIT_REMOTE
fi

CORESSH_COMMAND="ssh -i ~/.ssh/${SELECTED_KEY} -F /dev/null"
git config --local core.sshCommand "${CORESSH_COMMAND}"

git remote add "${NEW_GIT_REMOTE}" $GIT_URI

if [[ -n $GIT_USERNAME ]]; then
	echo -e "${WHITE}Setting local user name${RESET_COLOR}"
	git config --local user.name "${GIT_USERNAME}"
fi

if [[ -n $GIT_USEREMAIL ]]; then
	echo -e "${WHITE}Setting local user email${RESET_COLOR}"
	git config --local user.email "${GIT_USEREMAIL}"
fi