Generates an ssh key an automatically adds it to your bashrc

generate-ssh-key.sh

#!/bin/bash

#----- CONFIG -----
ssh_key_name=key_name

#if using with Unity, this should be left blank
password=""

# if using with unity, the host_alias should be substituted for the base remote URL in the package manager
host_alias="alias"
host="github.com"
ssh_path=C:/Windows/System32/OpenSSH

# true, false, append.
# true if you have never done this before
# append if you have and don't have your ssh-agent in the command.
# false if you're already set
overwrite_bashrc=true
bits=4096
protocol=ed25519
keygen_exec_path="$ssh_path/ssh-keygen.exe"

# Bash profile contents
bash_profile_contents="#!/bin/bash\nif [ -f ~/.bashrc ]\nthen\n~/.bashrc\nfi"

git config --global core.sshCommand "$ssh_path/ssh.exe"

#------ END CONFIG -----

cd ~ #just in case bash is launched from elsewhere


if [ $(ps ax | grep [s]sh-agent | wc -l) -gt 0 ] ; then
    echo "ssh-agent is already running"
else
    eval "$(ssh-agent)"
    # uncomment to prompt the user to generate a default SSH key
    # if [ "$(ssh-add -l)" == "The agent has no identities." ] ; then
    #     ssh-add ~/.ssh/id_rsa
    # fi
fi

if [ $overwrite_bashrc = true ] ; then
    echo '#!/bin/bash' > .bashrc
    echo 'eval $(ssh-agent -s)' > .bashrc
    echo -e "$bash_profile_contents" > .bash_profile
    
elif [ $overwrite_bashrc = append ] ; then
    echo 'eval $(ssh-agent -s)' >> .bashrc
fi

$keygen_exec_path -t $protocol -b $bits -N "$password" -f $ssh_key_name

existing_key=$(ssh-add -l | grep -q "$ssh_key_name")
if [ -z "$existing_key" ] ; then
    ssh-add -d ~/$ssh_key_name
    echo "key already added. Replacing"
fi

HOST_INFO="\nHost $host_alias\n  Hostname $host\n  AddKeysToAgent yes\n  IdentityFile ~/$ssh_key_name"
#Example output:
#Host fc
#  Hostname github.com
#  AddKeysToAgent yes
#  IdentityFile ~/key_name

CONFIG_FILE_PATH=$HOME/.ssh/config
touch "$CONFIG_FILE_PATH"

echo "Pausing for touch to finalize"
sleep 5s

if grep -q "$host_alias" "$CONFIG_FILE_PATH" ; then
    echo "Host alias already exists - not overwriting. This may cause problems, consider a different alias or deleting the old one."
else
    echo "Appending alias to $CONFIG_FILE_PATH"
    echo -e "\n$HOST_INFO" >> "$CONFIG_FILE_PATH"
fi
echo "ssh-add ${ssh_key_name}" >> .bashrc

ssh-add $ssh_key_name