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spec_unix.go
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spec_unix.go
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// +build !windows
package containerd
import (
"context"
"encoding/json"
"fmt"
"strconv"
"strings"
"github.com/containerd/containerd/containers"
"github.com/containerd/containerd/images"
"github.com/containerd/containerd/typeurl"
"github.com/opencontainers/image-spec/specs-go/v1"
specs "github.com/opencontainers/runtime-spec/specs-go"
)
const (
rwm = "rwm"
defaultRootfsPath = "rootfs"
)
func defaltCaps() []string {
return []string{
"CAP_CHOWN",
"CAP_DAC_OVERRIDE",
"CAP_FSETID",
"CAP_FOWNER",
"CAP_MKNOD",
"CAP_NET_RAW",
"CAP_SETGID",
"CAP_SETUID",
"CAP_SETFCAP",
"CAP_SETPCAP",
"CAP_NET_BIND_SERVICE",
"CAP_SYS_CHROOT",
"CAP_KILL",
"CAP_AUDIT_WRITE",
}
}
func defaultNamespaces() []specs.LinuxNamespace {
return []specs.LinuxNamespace{
{
Type: specs.PIDNamespace,
},
{
Type: specs.IPCNamespace,
},
{
Type: specs.UTSNamespace,
},
{
Type: specs.MountNamespace,
},
{
Type: specs.NetworkNamespace,
},
}
}
func createDefaultSpec() (*specs.Spec, error) {
s := &specs.Spec{
Version: specs.Version,
Root: &specs.Root{
Path: defaultRootfsPath,
},
Process: &specs.Process{
Cwd: "/",
NoNewPrivileges: true,
User: specs.User{
UID: 0,
GID: 0,
},
Capabilities: &specs.LinuxCapabilities{
Bounding: defaltCaps(),
Permitted: defaltCaps(),
Inheritable: defaltCaps(),
Effective: defaltCaps(),
Ambient: defaltCaps(),
},
Rlimits: []specs.POSIXRlimit{
{
Type: "RLIMIT_NOFILE",
Hard: uint64(1024),
Soft: uint64(1024),
},
},
},
Mounts: []specs.Mount{
{
Destination: "/proc",
Type: "proc",
Source: "proc",
},
{
Destination: "/dev",
Type: "tmpfs",
Source: "tmpfs",
Options: []string{"nosuid", "strictatime", "mode=755", "size=65536k"},
},
{
Destination: "/dev/pts",
Type: "devpts",
Source: "devpts",
Options: []string{"nosuid", "noexec", "newinstance", "ptmxmode=0666", "mode=0620", "gid=5"},
},
{
Destination: "/dev/shm",
Type: "tmpfs",
Source: "shm",
Options: []string{"nosuid", "noexec", "nodev", "mode=1777", "size=65536k"},
},
{
Destination: "/dev/mqueue",
Type: "mqueue",
Source: "mqueue",
Options: []string{"nosuid", "noexec", "nodev"},
},
{
Destination: "/sys",
Type: "sysfs",
Source: "sysfs",
Options: []string{"nosuid", "noexec", "nodev", "ro"},
},
{
Destination: "/run",
Type: "tmpfs",
Source: "tmpfs",
Options: []string{"nosuid", "strictatime", "mode=755", "size=65536k"},
},
{
Destination: "/etc/resolv.conf",
Type: "bind",
Source: "/etc/resolv.conf",
Options: []string{"rbind", "ro"},
},
{
Destination: "/etc/hosts",
Type: "bind",
Source: "/etc/hosts",
Options: []string{"rbind", "ro"},
},
{
Destination: "/etc/localtime",
Type: "bind",
Source: "/etc/localtime",
Options: []string{"rbind", "ro"},
},
},
Linux: &specs.Linux{
// TODO (@crosbymichael) make sure we don't have have two containers in the same cgroup
Resources: &specs.LinuxResources{
Devices: []specs.LinuxDeviceCgroup{
{
Allow: false,
Access: rwm,
},
},
},
Namespaces: defaultNamespaces(),
},
}
return s, nil
}
func WithTTY(s *specs.Spec) error {
s.Process.Terminal = true
s.Process.Env = append(s.Process.Env, "TERM=xterm")
return nil
}
func WithHostNamespace(ns specs.LinuxNamespaceType) SpecOpts {
return func(s *specs.Spec) error {
for i, n := range s.Linux.Namespaces {
if n.Type == ns {
s.Linux.Namespaces = append(s.Linux.Namespaces[:i], s.Linux.Namespaces[i+1:]...)
return nil
}
}
return nil
}
}
// WithLinuxNamespace uses the passed in namespace for the spec. If a namespace of the same type already exists in the
// spec, the existing namespace is replaced by the one provided.
func WithLinuxNamespace(ns specs.LinuxNamespace) SpecOpts {
return func(s *specs.Spec) error {
for i, n := range s.Linux.Namespaces {
if n.Type == ns.Type {
before := s.Linux.Namespaces[:i]
after := s.Linux.Namespaces[i+1:]
s.Linux.Namespaces = append(before, ns)
s.Linux.Namespaces = append(s.Linux.Namespaces, after...)
return nil
}
}
s.Linux.Namespaces = append(s.Linux.Namespaces, ns)
return nil
}
}
func WithImageConfig(ctx context.Context, i Image) SpecOpts {
return func(s *specs.Spec) error {
var (
image = i.(*image)
store = image.client.ContentStore()
)
ic, err := image.i.Config(ctx, store)
if err != nil {
return err
}
var (
ociimage v1.Image
config v1.ImageConfig
)
switch ic.MediaType {
case v1.MediaTypeImageConfig, images.MediaTypeDockerSchema2Config:
r, err := store.Reader(ctx, ic.Digest)
if err != nil {
return err
}
if err := json.NewDecoder(r).Decode(&ociimage); err != nil {
r.Close()
return err
}
r.Close()
config = ociimage.Config
default:
return fmt.Errorf("unknown image config media type %s", ic.MediaType)
}
env := []string{
"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
}
s.Process.Env = append(env, config.Env...)
var (
uid, gid uint32
)
cmd := config.Cmd
s.Process.Args = append(config.Entrypoint, cmd...)
if config.User != "" {
parts := strings.Split(config.User, ":")
switch len(parts) {
case 1:
v, err := strconv.ParseUint(parts[0], 0, 10)
if err != nil {
return err
}
uid, gid = uint32(v), uint32(v)
case 2:
v, err := strconv.ParseUint(parts[0], 0, 10)
if err != nil {
return err
}
uid = uint32(v)
if v, err = strconv.ParseUint(parts[1], 0, 10); err != nil {
return err
}
gid = uint32(v)
default:
return fmt.Errorf("invalid USER value %s", config.User)
}
}
s.Process.User.UID, s.Process.User.GID = uid, gid
cwd := config.WorkingDir
if cwd == "" {
cwd = "/"
}
s.Process.Cwd = cwd
return nil
}
}
func WithSpec(spec *specs.Spec) NewContainerOpts {
return func(ctx context.Context, client *Client, c *containers.Container) error {
any, err := typeurl.MarshalAny(spec)
if err != nil {
return err
}
c.Spec = any
return nil
}
}
func WithResources(resources *specs.LinuxResources) UpdateTaskOpts {
return func(ctx context.Context, client *Client, r *UpdateTaskInfo) error {
r.Resources = resources
return nil
}
}