88 lines
1.8 KiB
Go
88 lines
1.8 KiB
Go
package main
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import (
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"flag"
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"os"
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"runtime"
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"github.com/genuinetools/binctr/container"
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"github.com/opencontainers/runc/libcontainer"
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_ "github.com/opencontainers/runc/libcontainer/nsenter"
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"github.com/sirupsen/logrus"
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)
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const (
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defaultRoot = "/tmp/binctr-busybox"
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defaultRootfsDir = "rootfs"
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)
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var (
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containerID string
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root string
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)
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func init() {
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// Parse flags
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flag.StringVar(&containerID, "id", "busybox", "container ID")
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flag.StringVar(&root, "root", defaultRoot, "root directory of container state, should be tmpfs")
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flag.Usage = func() {
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flag.PrintDefaults()
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}
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flag.Parse()
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}
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//go:generate go run generate.go
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func main() {
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if len(os.Args) > 1 && os.Args[1] == "init" {
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runInit()
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return
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}
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// Create a new container spec with the following options.
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opts := container.SpecOpts{
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Rootless: true,
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Terminal: true,
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}
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spec := container.Spec(opts)
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// Initialize the container object.
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c := &container.Container{
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ID: containerID,
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Spec: spec,
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Root: root,
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Rootless: true,
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}
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// Unpack the rootfs.
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if err := c.UnpackRootfs(defaultRootfsDir, Asset); err != nil {
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logrus.Fatal(err)
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}
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// Run the container.
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status, err := c.Run()
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if err != nil {
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logrus.Fatal(err)
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}
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// Remove the rootfs after the container has exited.
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if err := os.RemoveAll(defaultRootfsDir); err != nil {
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logrus.Warnf("removing rootfs failed: %v", err)
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}
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// Exit with the container's exit status.
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os.Exit(status)
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}
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func runInit() {
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runtime.GOMAXPROCS(1)
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runtime.LockOSThread()
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factory, _ := libcontainer.New("")
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if err := factory.StartInitialization(); err != nil {
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// as the error is sent back to the parent there is no need to log
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// or write it to stderr because the parent process will handle this
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os.Exit(1)
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}
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panic("libcontainer: container init failed to exec")
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}
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