363 lines
12 KiB
Python
363 lines
12 KiB
Python
#!/usr/bin/env python3
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import os
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import socket
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import subprocess
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import uuid
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from flask import Flask, request, render_template_string, flash
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app = Flask(__name__)
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app.secret_key = os.environ.get("MICROCONTAINERS_SECRET_KEY", "dev-only-not-secret")
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# --- Config -----------------------------------------------------------------
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IMAGES = {
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"debian": {
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"docker_image": "micro-debian-dev:latest",
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"label": "Debian Dev Box (micro-debian-dev)"
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},
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"fedora": {
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"docker_image": "micro-fedora43-dev:latest",
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"label": "Fedora 43 Dev Box (micro-fedora43-dev)"
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},
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}
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DEFAULT_IMAGE_KEY = "debian"
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DATA_ROOT = "/srv/microcontainers" # per-tenant metadata + disk.img
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MOUNT_ROOT = "/mnt/microcontainers" # where disk.img files are mounted
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HOSTNAME = "arthur.lan" # or "mentalnet.xyz" if you prefer
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PORT_RANGE_START = 20000
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PORT_RANGE_END = 21000
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os.makedirs(DATA_ROOT, exist_ok=True)
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os.makedirs(MOUNT_ROOT, exist_ok=True)
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# --- Helpers ----------------------------------------------------------------
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def find_free_port(start=PORT_RANGE_START, end=PORT_RANGE_END):
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"""Find a free TCP port on the host in the given range."""
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for port in range(start, end):
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with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
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s.settimeout(0.2)
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try:
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s.bind(("", port))
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return port
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except OSError:
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continue
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raise RuntimeError("No free ports available in range")
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def validate_ssh_key(key: str) -> bool:
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"""Very basic SSH public key validation."""
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key = key.strip()
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if not key:
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return False
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allowed_prefixes = (
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"ssh-ed25519",
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"ssh-rsa",
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"ecdsa-sha2-",
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"sk-ssh-",
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)
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return any(key.startswith(p) for p in allowed_prefixes)
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def is_mounted(mount_point: str) -> bool:
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"""Check if a given mount point is already mounted."""
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try:
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with open("/proc/mounts", "r") as f:
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for line in f:
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parts = line.split()
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if len(parts) >= 2 and parts[1] == mount_point:
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return True
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except FileNotFoundError:
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pass
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return False
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def ensure_tenant_disk(container_name: str, ssh_key: str, size_gb: int = 3) -> str:
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"""
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Ensure a per-tenant disk.img exists, is formatted, mounted, and has
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.ssh/authorized_keys populated.
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Returns the host mount point path, which will be bind-mounted to /home/micro.
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"""
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tenant_root = os.path.join(DATA_ROOT, container_name)
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os.makedirs(tenant_root, exist_ok=True)
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disk_img = os.path.join(tenant_root, "disk.img")
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mount_point = os.path.join(MOUNT_ROOT, container_name)
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os.makedirs(mount_point, exist_ok=True)
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# 1) Create sparse disk.img if it doesn't exist
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if not os.path.exists(disk_img):
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subprocess.run(["fallocate", "-l", f"{size_gb}G", disk_img], check=True)
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subprocess.run(["mkfs.ext4", "-F", disk_img], check=True)
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# 2) Mount it if not already mounted
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if not is_mounted(mount_point):
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subprocess.run(["mount", "-o", "loop", disk_img, mount_point], check=True)
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# 3) Prepare /home/micro layout inside the filesystem
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# (we're mounting this whole thing as /home/micro in the container)
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ssh_dir = os.path.join(mount_point, ".ssh")
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os.makedirs(ssh_dir, exist_ok=True)
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auth_keys_path = os.path.join(ssh_dir, "authorized_keys")
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with open(auth_keys_path, "w") as f:
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f.write(ssh_key.strip() + "\n")
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# Proper perms for SSH
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os.chmod(ssh_dir, 0o700)
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os.chmod(auth_keys_path, 0o600)
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# Make everything in /home/micro look like micro:micro (uid/gid 1000)
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subprocess.run(["chown", "-R", "1000:1000", mount_point], check=True)
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return mount_point
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def run_docker_container(container_name: str, host_port: int, docker_image: str, home_mount: str):
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"""
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Start the tenant container:
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- Binds host_port -> container:22
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- Mounts per-tenant 3GB disk as /home/micro
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"""
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cmd = [
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"docker", "run", "-d",
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"--name", container_name,
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"--memory=512m",
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"--memory-swap=512m",
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"-p", f"{host_port}:22",
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"-v", f"{home_mount}:/home/micro",
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docker_image,
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]
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subprocess.run(cmd, check=True)
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# --- Template ---------------------------------------------------------------
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INDEX_TEMPLATE = """
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<!doctype html>
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<html>
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<head>
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<meta charset="utf-8">
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<title>MicroContainer Provisioning</title>
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<style>
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body {
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background: #111;
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color: #eee;
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font-family: system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
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max-width: 720px;
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margin: 40px auto;
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padding: 0 20px;
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}
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h1 { color: #66e0ff; }
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.box {
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background: #1a1a1a;
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border-radius: 8px;
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padding: 20px;
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margin-bottom: 20px;
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border: 1px solid #333;
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}
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label { display: block; margin-bottom: 8px; font-weight: 600; }
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textarea, input[type=text], select {
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width: 100%;
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box-sizing: border-box;
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background: #101010;
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border: 1px solid #444;
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border-radius: 4px;
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color: #eee;
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padding: 8px;
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font-family: monospace;
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font-size: 0.9rem;
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}
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button {
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background: #66e0ff;
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color: #000;
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padding: 8px 16px;
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border-radius: 4px;
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border: none;
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font-weight: 600;
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cursor: pointer;
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margin-top: 10px;
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}
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button:hover { background: #4bc1dd; }
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.message { color: #ff8080; margin-bottom: 10px; }
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.success { color: #9bff9b; }
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code { background: #000; padding: 2px 4px; border-radius: 3px; }
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</style>
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</head>
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<body>
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<h1>MicroContainer Provisioning (Prototype)</h1>
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<div class="box">
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<p>This prototype spins up a small Docker-based "micro VM" and wires in your SSH public key.</p>
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<ul>
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<li>Available base images:</li>
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<ul>
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{% for key, info in images.items() %}
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<li><code>{{ key }}</code>: {{ info.label }}</li>
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{% endfor %}
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</ul>
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<li>User: <code>micro</code></li>
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<li>Per-tenant /home size: <code>3 GB</code> (loopback ext4)</li>
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<li>SSH inside container: <code>port 22</code></li>
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<li>Host port: auto-assigned from <code>{{ port_start }}-{{ port_end }}</code></li>
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</ul>
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</div>
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{% with messages = get_flashed_messages() %}
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{% if messages %}
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<div class="message">
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{% for msg in messages %}
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{{ msg }}<br>
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{% endfor %}
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</div>
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{% endif %}
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{% endwith %}
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{% if result %}
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<div class="box">
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<h2 class="success">Container created!</h2>
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<p><strong>Image:</strong> <code>{{ result.image_key }}</code> — {{ images[result.image_key].label }}</p>
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<p><strong>Container name:</strong> <code>{{ result.name }}</code></p>
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<p><strong>Host port:</strong> <code>{{ result.port }}</code></p>
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<p><strong>SSH command:</strong></p>
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<pre><code>ssh micro@{{ hostname }} -p {{ result.port }}</code></pre>
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<p>You can change the password for <code>micro</code> after logging in with:</p>
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<pre><code>passwd</code></pre>
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</div>
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{% endif %}
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<div class="box">
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<form method="post">
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<label for="image">Base image</label>
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<select id="image" name="image">
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{% for key, info in images.items() %}
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<option value="{{ key }}" {% if key == selected_image %}selected{% endif %}>
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{{ key }} - {{ info.label }}
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</option>
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{% endfor %}
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</select>
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<label for="ssh_key">SSH public key</label>
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<textarea id="ssh_key" name="ssh_key" rows="6" placeholder="ssh-ed25519 AAAAC3Nz... user@host" required>{{ ssh_key or "" }}</textarea>
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<label for="note">Optional note / label (will be part of container name)</label>
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<input type="text" id="note" name="note" placeholder="e.g. debian-dev-01">
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<button type="submit">Provision MicroContainer</button>
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</form>
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</div>
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</body>
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</html>
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"""
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# --- Routes -----------------------------------------------------------------
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@app.route("/", methods=["GET", "POST"])
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def index():
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if request.method == "GET":
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return render_template_string(
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INDEX_TEMPLATE,
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images=IMAGES,
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port_start=PORT_RANGE_START,
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port_end=PORT_RANGE_END,
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result=None,
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ssh_key="",
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hostname=HOSTNAME,
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selected_image=DEFAULT_IMAGE_KEY,
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)
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# POST: handle provisioning
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ssh_key = (request.form.get("ssh_key") or "").strip()
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note = (request.form.get("note") or "").strip()
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image_key = (request.form.get("image") or DEFAULT_IMAGE_KEY).strip()
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if image_key not in IMAGES:
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image_key = DEFAULT_IMAGE_KEY
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docker_image = IMAGES[image_key]["docker_image"]
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if not validate_ssh_key(ssh_key):
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flash("Invalid SSH public key format. Please paste a standard OpenSSH public key line.")
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return render_template_string(
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INDEX_TEMPLATE,
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images=IMAGES,
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port_start=PORT_RANGE_START,
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port_end=PORT_RANGE_END,
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result=None,
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ssh_key=ssh_key,
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hostname=HOSTNAME,
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selected_image=image_key,
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)
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# Generate a container name
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suffix = uuid.uuid4().hex[:6]
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base_name = f"mc-{image_key}"
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if note:
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safe_note = "".join(c for c in note.lower().replace(" ", "-") if c.isalnum() or c in "-_")
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base_name = f"mc-{image_key}-{safe_note}"
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container_name = f"{base_name}-{suffix}"
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# Ensure per-tenant disk (3 GB ext4) and authorized_keys
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try:
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home_mount = ensure_tenant_disk(container_name, ssh_key, size_gb=3)
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except subprocess.CalledProcessError as e:
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flash(f"Error preparing tenant disk: {e}")
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return render_template_string(
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INDEX_TEMPLATE,
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images=IMAGES,
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port_start=PORT_RANGE_START,
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port_end=PORT_RANGE_END,
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result=None,
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ssh_key=ssh_key,
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hostname=HOSTNAME,
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selected_image=image_key,
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)
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# Choose a free port and start container
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host_port = find_free_port()
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try:
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run_docker_container(container_name, host_port, docker_image, home_mount)
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except subprocess.CalledProcessError as e:
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flash(f"Error starting container: {e}")
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return render_template_string(
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INDEX_TEMPLATE,
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images=IMAGES,
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port_start=PORT_RANGE_START,
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port_end=PORT_RANGE_END,
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result=None,
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ssh_key=ssh_key,
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hostname=HOSTNAME,
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selected_image=image_key,
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)
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class Result:
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def __init__(self, name, port, image_key):
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self.name = name
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self.port = port
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self.image_key = image_key
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result = Result(container_name, host_port, image_key)
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return render_template_string(
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INDEX_TEMPLATE,
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images=IMAGES,
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port_start=PORT_RANGE_START,
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port_end=PORT_RANGE_END,
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result=result,
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ssh_key="",
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hostname=HOSTNAME,
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selected_image=image_key,
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)
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if __name__ == "__main__":
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# For dev/testing only
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app.run(host="0.0.0.0", port=5000, debug=True)
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