added scripts

init-instance.sh

@@ -0,0 +1,62 @@
+#!/usr/bin/env bash
+#
+# setup-student.sh
+#
+# Usage:
+#   curl -sL URL_TO_THIS_SCRIPT | bash -s -- GITHUB_USERNAME
+#
+# This script must be run as the 'rocky' user (with passwordless sudo).
+# It takes one argument: the GitHub username of the student.
+# It will:
+#   1. Retrieve the student's public SSH keys from GitHub and install them
+#      so they can SSH in as 'rocky'.
+#   2. Install cowsay, screen, and tmux.
+#   3. Update /etc/motd to welcome the student via cowsay and point them
+#      at the tutorial repo.
+
+set -euo pipefail
+
+if [ "$#" -ne 1 ]; then
+  echo "Error: Missing GitHub username."
+  echo "Usage: $0 GITHUB_USERNAME"
+  exit 1
+fi
+
+GH_USER="$1"
+SSH_DIR="/home/rocky/.ssh"
+AUTHORIZED_KEYS="$SSH_DIR/authorized_keys"
+MOTD_FILE="/etc/motd"
+TUTORIAL_URL="https://github.com/OpenCHAMI/tutorial-2025"
+
+echo "→ Installing SSH keys for GitHub user '$GH_USER'..."
+
+# Create .ssh directory if needed
+sudo mkdir -p "$SSH_DIR"
+sudo chmod 700 "$SSH_DIR"
+
+# Fetch and install public keys
+KEYS=$(curl -fsSL "https://github.com/${GH_USER}.keys")
+if [ ! -z "${KEYS}" ]; then
+  echo "${KEYS}" | sudo tee "$AUTHORIZED_KEYS" >/dev/null
+  echo "   ✓ Retrieved keys from https://github.com/${GH_USER}.keys"
+else
+  echo "   ✗ Could not find keys for user '$GH_USER'; please check the username and that authorization SSH keys are present."
+  exit 2
+fi
+
+sudo chmod 600 "$AUTHORIZED_KEYS"
+sudo chown -R rocky:rocky "$SSH_DIR"
+
+echo "→ Installing packages: cowsay, screen, tmux..."
+sudo dnf install -y cowsay screen tmux
+
+echo "→ Updating MOTD in $MOTD_FILE..."
+
+# Generate motd with cowsay greeting and tutorial link
+sudo tee "$MOTD_FILE" >/dev/null <<EOF
+$(/usr/bin/cowsay "Welcome, ${GH_USER}!")
+To get started, see the tutorial at:
+${TUTORIAL_URL}
+EOF
+
+echo "✔ Setup complete. Student '$GH_USER' can now SSH in and will be greeted on login."