Add init_ssh.sh (also added to init_session.sh)

Original idea by @GonzSanch (gsanchez): GonzSanch@0834348

README.md

@@ -12,13 +12,18 @@ You can also use the scripts of your choice without cloning the repository. You
 ### init_session
 A script to init your session at 42 when you log in. It can:
 - Connect your bluetooth device
+- Init SSH (see [init_ssh](#init_ssh))
 - Init docker (see [init_docker](#init_docker))
 - Check if all your apps are installed and start them
 - Update brew and its formulas
 - Clean your disk (also check [free_space](#free_space))
 - Start [RP42](https://github.com/alexandregv/RP42)
 - Open System Preferences (You could need it to edit your keyboard/screen settings, etc)
 
+### init_ssh
+A script to create an SSH key pair if needed, then see how to add it on the intra.  
+It can copy the public key to your clipboard if supported (macOS or Linux with xsel/xclip) and open the intra settings page automatically.
+
 ### init_docker
 A script to init Docker for Mac at 42.  
 It checks if Docker for Mac is properly installed and makes symlinks to the goinfre to not fill your session disk.

init_session.sh

@@ -28,6 +28,8 @@ reset=$'\033[0;39m'
 # Config
 toolbox_path="$HOME/42toolbox"                       #=> 42toolbox path. See https://github.com/alexandregv/42toolbox
 bluetooth_device=""                                  #=> Bluetooth device name. Empty = skip bluetooth setup
+init_ssh=true                                        #=> Init SSH? Creates SSH key if needed and shows how to add it on the intra
+init_ssh_path="$toolbox_path/init_ssh.sh"            #=> Location of init_ssh.sh file. See https://github.com/alexandregv/42toolbox/blob/master/init_ssh.sh
 init_docker=true                                     #=> Init Docker for Mac? See https://github.com/alexandregv/42toolbox/blob/master/init_docker.sh
 init_docker_path="$toolbox_path/init_docker.sh"      #=> Location of init_docker.sh file. See https://github.com/alexandregv/42toolbox/blob/master/init_docker.sh
 install_apps=true                                    #=> Install desired apps if they are missing?
@@ -52,6 +54,10 @@ declare -a desired_apps=(
 )
 
 ################################################################################
+# Create SSH key if needed and show how to add it on the intra
+# See init_ssh.sh
+[ "$init_ssh" = true ] && $init_ssh_path
+
 # Pair and connect a bluetooth device
 if [ -n "$bluetooth_device" ]; then
 	echo -e "${blue}Setting up Bluetooth.${reset}"

init_ssh.sh

@@ -0,0 +1,58 @@
+#!/usr/bin/env bash
+# **************************************************************************** #
+#                                                                              #
+#                                                         :::      ::::::::    #
+#    init_ssh.sh                                        :+:      :+:    :+:    #
+#                                                     +:+ +:+         +:+      #
+#    By: aguiot-- <[email protected]>          +#+  +:+       +#+         #
+#                                                 +#+#+#+#+#+   +#+            #
+#    Created: 2021/11/06 18:07:12 by aguiot--          #+#    #+#              #
+#    Updated: 2021/11/06 18:21:44 by aguiot--         ###   ########.fr        #
+#                                                                              #
+# **************************************************************************** #
+
+# Colors
+blue=$'\033[0;34m'
+cyan=$'\033[1;96m'
+reset=$'\033[0;39m'
+
+# Generate SSH key pair if needed
+if [ -f ~/.ssh/id_rsa ]; then
+	echo -e "${blue}SSH key \`${cyan}~/.ssh/id_rsa${blue}\` already exists, using it${reset}"
+	key_already_exists=true
+else
+	echo -e "${blue}Generating SSH key \`${cyan}~/.ssh/id_rsa${blue}\`${reset}"
+	ssh-keygen -t rsa -b 4096 -f ~/.ssh/id_rsa -C "$USER"
+fi
+
+# Start and use SSH agent
+echo -e "\n${blue}Starting SSH agent and adding key${reset}"
+eval "$(ssh-agent >/dev/null)"
+ssh-add ~/.ssh/id_rsa
+
+# Show the public key
+echo -e "\n${blue}Here is your public key:\n---------${reset}"
+cat ~/.ssh/id_rsa.pub
+echo -e "${blue}---------${reset}"
+
+# If possible, propose to copy the public key to the clipboard
+if [ -x "$(command -v pbcopy)" ] || [ -x "$(command -v xclip)" ] || [ -x "$(command -v xsel)" ]; then
+	read -n1 -p "${blue}Do you want to copy it to your clipboard? [${cyan}Y${blue}/n]${reset} " input
+	echo -e "\n"
+	if [ -n "$input" ] && [ "$input" = "y" ]; then
+		[ -x "$(command -v pbcopy)" ] && pbcopy < ~/.ssh/id_rsa.pub
+		[ -x "$(command -v xclip)" ] && xclip -selection clipboard < ~/.ssh/id_rsa.pub
+		[ -x "$(command -v xsel)" ] && xsel --clipboard < ~/.ssh/id_rsa.pub
+	fi
+fi
+
+# Show some help to add the key to intra.42.fr
+echo -e "${blue}Make sure that it's set in your intra settings (or github/gitlab/whatever): ${cyan}https://profile.intra.42.fr/gitlab_users\n${reset}"
+if [ ! -z ${key_already_exists+x} ]; then
+	fingerprint="$(ssh-keygen -E md5 -l -f ~/.ssh/id_rsa | cut -d: -f2- | cut -d' ' -f1)"
+	echo -e "${blue}To check if your key is already set, open the settings page and check if one of your keys has this fingerprint:\n${cyan}${fingerprint}\n${reset}"
+fi
+
+# If possible, open intra SSH settings page
+[ -x "$(command -v open)" ] && open 'https://profile.intra.42.fr/gitlab_users' &>/dev/null ;:
+[ -x "$(command -v xdg-open)" ] && xdg-open 'https://profile.intra.42.fr/gitlab_users' &>/dev/null ;: