core/internal/containerd/main.go

// Copyright 2020 The Monogon Project Authors.
//
// SPDX-License-Identifier: Apache-2.0
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package containerd

import (
	"context"
	"fmt"
	"git.monogon.dev/source/nexantic.git/core/internal/common/supervisor"
	"os"
	"os/exec"

	"git.monogon.dev/source/nexantic.git/core/pkg/logbuffer"

	"golang.org/x/sys/unix"
)

type Service struct {
	Log *logbuffer.LogBuffer
}

func New() (*Service, error) {
	return &Service{Log: logbuffer.New(5000, 16384)}, nil
}

func (s *Service) Run() supervisor.Runnable {
	return func(ctx context.Context) error {
		cmd := exec.CommandContext(ctx, "/containerd/bin/containerd", "--config", "/containerd/conf/config.toml")
		cmd.Stdout = s.Log
		cmd.Stderr = s.Log
		cmd.Env = []string{"PATH=/containerd/bin", "TMPDIR=/containerd/run/tmp"}

		if err := unix.Mount("tmpfs", "/containerd/run", "tmpfs", 0, ""); err != nil {
			panic(err)
		}
		if err := os.MkdirAll("/containerd/run/tmp", 0755); err != nil {
			panic(err)
		}

		// TODO(lorenz): Healthcheck against CRI RuntimeService.Status() and SignalHealthy

		err := cmd.Run()
		fmt.Fprintf(s.Log, "containerd stopped: %v\n", err)
		return err
	}
}