get-ssh-keys.sh

get-ssh-keys.sh

#!/bin/bash

# Exit immediately if a command exits with a non-zero status.
set -e

# The URL of the SSH keys to download.
KEYS_URL="https://github.com/kmf.keys"

# The directory where SSH keys are stored.
SSH_DIR="$HOME/.ssh"

# The file where authorized keys are stored.
AUTH_KEYS_FILE="$SSH_DIR/authorized_keys"

# --- Main Script ---

# 1. Check for `curl` and `wget`. `curl` is preferred.
if ! command -v curl &> /dev/null
then
    if ! command -v wget &> /dev/null
    then
        echo "Error: Neither 'curl' nor 'wget' could be found. Please install one of them."
        exit 1
    fi
fi

# 2. Create the .ssh directory if it doesn't exist and set permissions.
if [ ! -d "$SSH_DIR" ]; then
    mkdir -p "$SSH_DIR"
    echo "Created directory: $SSH_DIR"
fi

# Ensure the .ssh directory has secure permissions (700).
chmod 700 "$SSH_DIR"
echo "Set permissions for $SSH_DIR to 700."

# 3. Download the keys and append them to the authorized_keys file.
# Use `curl -s` for silent mode (no progress bar) or `wget -qO-` for quiet output to stdout.
if command -v curl &> /dev/null
then
    echo "Downloading keys from $KEYS_URL using curl..."
    curl -s "$KEYS_URL" >> "$AUTH_KEYS_FILE"
elif command -v wget &> /dev/null
then
    echo "Downloading keys from $KEYS_URL using wget..."
    wget -qO- "$KEYS_URL" >> "$AUTH_KEYS_FILE"
fi

# 4. Set secure permissions for the authorized_keys file.
chmod 600 "$AUTH_KEYS_FILE"
echo "Set permissions for $AUTH_KEYS_FILE to 600."

echo "✅ Script complete. SSH keys have been added to $AUTH_KEYS_FILE."