| // +build !windows |
| |
| package daemon |
| |
| import ( |
| "fmt" |
| "io/ioutil" |
| "os" |
| "os/exec" |
| "path/filepath" |
| "strings" |
| |
| "github.com/containerd/containerd/runtime/linux/runctypes" |
| v2runcoptions "github.com/containerd/containerd/runtime/v2/runc/options" |
| "github.com/docker/docker/api/types" |
| "github.com/docker/docker/daemon/config" |
| "github.com/docker/docker/pkg/ioutils" |
| "github.com/pkg/errors" |
| "github.com/sirupsen/logrus" |
| ) |
| |
| const ( |
| defaultRuntimeName = "runc" |
| |
| linuxShimV1 = "io.containerd.runtime.v1.linux" |
| linuxShimV2 = "io.containerd.runc.v2" |
| ) |
| |
| func configureRuntimes(conf *config.Config) { |
| if conf.DefaultRuntime == "" { |
| conf.DefaultRuntime = config.StockRuntimeName |
| } |
| if conf.Runtimes == nil { |
| conf.Runtimes = make(map[string]types.Runtime) |
| } |
| conf.Runtimes[config.LinuxV1RuntimeName] = types.Runtime{Path: defaultRuntimeName, Shim: defaultV1ShimConfig(conf, defaultRuntimeName)} |
| conf.Runtimes[config.LinuxV2RuntimeName] = types.Runtime{Path: defaultRuntimeName, Shim: defaultV2ShimConfig(conf, defaultRuntimeName)} |
| conf.Runtimes[config.StockRuntimeName] = conf.Runtimes[config.LinuxV2RuntimeName] |
| } |
| |
| func defaultV2ShimConfig(conf *config.Config, runtimePath string) *types.ShimConfig { |
| return &types.ShimConfig{ |
| Binary: linuxShimV2, |
| Opts: &v2runcoptions.Options{ |
| BinaryName: runtimePath, |
| Root: filepath.Join(conf.ExecRoot, "runtime-"+defaultRuntimeName), |
| SystemdCgroup: UsingSystemd(conf), |
| NoPivotRoot: os.Getenv("DOCKER_RAMDISK") != "", |
| }, |
| } |
| } |
| |
| func defaultV1ShimConfig(conf *config.Config, runtimePath string) *types.ShimConfig { |
| return &types.ShimConfig{ |
| Binary: linuxShimV1, |
| Opts: &runctypes.RuncOptions{ |
| Runtime: runtimePath, |
| RuntimeRoot: filepath.Join(conf.ExecRoot, "runtime-"+defaultRuntimeName), |
| SystemdCgroup: UsingSystemd(conf), |
| }, |
| } |
| } |
| |
| func (daemon *Daemon) loadRuntimes() error { |
| return daemon.initRuntimes(daemon.configStore.Runtimes) |
| } |
| |
| func (daemon *Daemon) initRuntimes(runtimes map[string]types.Runtime) (err error) { |
| runtimeDir := filepath.Join(daemon.configStore.Root, "runtimes") |
| // Remove old temp directory if any |
| os.RemoveAll(runtimeDir + "-old") |
| tmpDir, err := ioutils.TempDir(daemon.configStore.Root, "gen-runtimes") |
| if err != nil { |
| return errors.Wrap(err, "failed to get temp dir to generate runtime scripts") |
| } |
| defer func() { |
| if err != nil { |
| if err1 := os.RemoveAll(tmpDir); err1 != nil { |
| logrus.WithError(err1).WithField("dir", tmpDir). |
| Warn("failed to remove tmp dir") |
| } |
| return |
| } |
| |
| if err = os.Rename(runtimeDir, runtimeDir+"-old"); err != nil { |
| return |
| } |
| if err = os.Rename(tmpDir, runtimeDir); err != nil { |
| err = errors.Wrap(err, "failed to setup runtimes dir, new containers may not start") |
| return |
| } |
| if err = os.RemoveAll(runtimeDir + "-old"); err != nil { |
| logrus.WithError(err).WithField("dir", tmpDir). |
| Warn("failed to remove old runtimes dir") |
| } |
| }() |
| |
| for name, rt := range runtimes { |
| if len(rt.Args) == 0 { |
| continue |
| } |
| |
| script := filepath.Join(tmpDir, name) |
| content := fmt.Sprintf("#!/bin/sh\n%s %s $@\n", rt.Path, strings.Join(rt.Args, " ")) |
| if err := ioutil.WriteFile(script, []byte(content), 0700); err != nil { |
| return err |
| } |
| } |
| return nil |
| } |
| |
| // rewriteRuntimePath is used for runtimes which have custom arguments supplied. |
| // This is needed because the containerd API only calls the OCI runtime binary, there is no options for extra arguments. |
| // To support this case, the daemon wraps the specified runtime in a script that passes through those arguments. |
| func (daemon *Daemon) rewriteRuntimePath(name, p string, args []string) (string, error) { |
| if len(args) == 0 { |
| return p, nil |
| } |
| |
| // Check that the runtime path actually exists here so that we can return a well known error. |
| if _, err := exec.LookPath(p); err != nil { |
| return "", errors.Wrap(err, "error while looking up the specified runtime path") |
| } |
| |
| return filepath.Join(daemon.configStore.Root, "runtimes", name), nil |
| } |