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95 lines
3.5 KiB
Python
95 lines
3.5 KiB
Python
"""Experimental rootless Docker bootstrap for Apple-container bottles.
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The daemon and every child remain inside the existing per-bottle VM. This
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module deliberately refuses to compensate for missing prerequisites with
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outer capabilities, a privileged container, or a host Docker socket.
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"""
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from __future__ import annotations
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import shlex
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import shutil
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import tempfile
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import time
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from pathlib import Path
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from typing import Callable
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from ...log import die, info
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_INIT = "/usr/local/libexec/bot-bottle/rootless-docker-init"
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_RUNTIME_DIR = "/tmp/bot-bottle-docker-run"
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_SOCKET = f"{_RUNTIME_DIR}/docker.sock"
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READY_RETRIES = 30
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def build_image(
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base_image: str,
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build: Callable[..., None],
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) -> str:
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"""Layer spike-only tooling on an already-built provider image."""
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image = f"{base_image}-rootless-docker"
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init_script = Path(__file__).with_name("rootless-docker-init.sh")
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with tempfile.TemporaryDirectory(prefix="bot-bottle-rootless-docker.") as tmp:
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context = Path(tmp)
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shutil.copy2(init_script, context / "rootless-docker-init.sh")
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(context / "Dockerfile").write_text(
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"FROM docker:28-cli AS docker_cli\n"
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f"FROM {base_image}\n"
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"USER root\n"
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"COPY --from=docker_cli /usr/local/libexec/docker/cli-plugins/"
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"docker-compose /usr/local/libexec/docker/cli-plugins/docker-compose\n"
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"RUN apt-get update \\\n"
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" && apt-get install -y --no-install-recommends docker.io uidmap "
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"rootlesskit slirp4netns fuse-overlayfs \\\n"
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" && rm -rf /var/lib/apt/lists/* \\\n"
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" && sed -i '/^node:/d' /etc/subuid /etc/subgid \\\n"
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" && printf 'node:100000:65536\\n' >> /etc/subuid \\\n"
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" && printf 'node:100000:65536\\n' >> /etc/subgid \\\n"
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" && ln -s /usr/share/docker.io/contrib/dockerd-rootless.sh "
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"/usr/local/bin/dockerd-rootless.sh\n"
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"COPY rootless-docker-init.sh "
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"/usr/local/libexec/bot-bottle/rootless-docker-init\n"
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"RUN chmod 0755 /usr/local/libexec/bot-bottle/rootless-docker-init\n"
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"USER node\n",
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encoding="utf-8",
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)
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build(image, str(context), dockerfile=str(context / "Dockerfile"))
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return image
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def guest_env(enabled: bool) -> dict[str, str]:
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"""Environment consumed by the Docker CLI inside an enabled bottle."""
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if not enabled:
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return {}
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return {
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"DOCKER_HOST": f"unix://{_SOCKET}",
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"XDG_RUNTIME_DIR": _RUNTIME_DIR,
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}
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def start(bottle: object) -> None:
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"""Start and verify the unprivileged daemon through the bottle exec API."""
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info("starting experimental rootless Docker daemon")
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result = bottle.exec(shlex.quote(_INIT)) # type: ignore[attr-defined]
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if result.returncode != 0:
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detail = (result.stderr or result.stdout or "").strip()
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die(f"rootless Docker bootstrap failed: {detail or '<no output>'}")
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for _ in range(READY_RETRIES):
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result = bottle.exec("docker info >/dev/null 2>&1") # type: ignore[attr-defined]
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if result.returncode == 0:
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info("rootless Docker daemon is ready")
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return
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time.sleep(0.2)
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logs = bottle.exec( # type: ignore[attr-defined]
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"tail -n 80 /tmp/bot-bottle-rootless-docker.log 2>/dev/null || true"
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)
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die(
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"rootless Docker did not become ready without additional outer "
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f"privileges:\n{(logs.stdout or logs.stderr or '<no log>').strip()}"
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)
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__all__ = ["build_image", "guest_env", "start"]
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