Setup SSH config for an existing repository

gsetsshcfg

#!/bin/bash

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

if [ $# -ne 0 ]; then
	echo -e "${RED}Invalid argument count${RESET_COLOR}\n"

	echo "Usage:"
	echo -e "\tgsetsshcfg"

	exit 1
fi

GIT_URI=$1

echo -e "${WHITE}Please answer those questions in order to add another remote to your repository with SSH"

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 ""
echo -e "${WHITE}Setting SSH config 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}"

Setup SSH config for an existing repository.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.github.com/chsxf/7f7ca32bf436d8f9f0fe35e2bb9d1b63/raw/gsetsshcfg
chmod +x gsetsshcfg

Usage

gsetsshcfg

The script will then guide you through the process.