Add CLI installers for Tea, Borg, and Git Credential Manager, and enhance setup script with improved authentication

credential-manager-demo.sh

@@ -0,0 +1,57 @@
+#!/bin/bash
+
+# Demo: Git Credential Manager in Console Mode
+# This script demonstrates how credential managers work without GUI
+
+echo "=== Git Credential Manager Console Demo ==="
+echo
+
+# Check available credential managers
+echo "1. Checking available credential managers..."
+if command -v git-credential-manager >/dev/null 2>&1; then
+    echo "✓ Git Credential Manager (GCM) found: $(git-credential-manager --version)"
+else
+    echo "✗ Git Credential Manager not found"
+fi
+
+if [[ "$OSTYPE" == "darwin"* ]]; then
+    if git config --global --get credential.helper 2>/dev/null | grep -q "osxkeychain"; then
+        echo "✓ macOS Keychain helper configured"
+    fi
+elif [[ "$OSTYPE" == "linux-gnu"* ]]; then
+    if command -v gnome-keyring-daemon >/dev/null 2>&1; then
+        echo "✓ GNOME Keyring available"
+    fi
+fi
+
+echo
+echo "2. Current Git credential configuration:"
+git config --global --show-origin --get credential.helper 2>/dev/null || echo "No global credential helper configured"
+
+echo
+echo "3. Testing credential storage (console mode)..."
+echo "This demonstrates how credentials are stored/retrieved without GUI"
+
+# Create a test credential input
+cat << 'EOF' | git credential-manager get 2>/dev/null || echo "Credential manager ready for input"
+protocol=https
+host=example.com
+username=testuser
+EOF
+
+echo
+echo "4. How it works in console:"
+echo "   - First 'git push/pull' prompts for username/token"
+echo "   - Credential manager stores them securely"
+echo "   - Subsequent operations use stored credentials automatically"
+echo "   - No GUI required - all terminal-based"
+
+echo
+echo "5. Available commands (all console-based):"
+echo "   git credential-manager configure   # Configure settings"
+echo "   git credential-manager erase       # Remove stored credentials"
+echo "   git credential-manager approve      # Approve credential storage"
+echo "   git credential-manager reject      # Reject credential storage"
+
+echo
+echo "=== Demo Complete ==="