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// +build linux
package libpod
import (
"context"
"strings"
"github.com/containers/common/pkg/config"
"github.com/containers/podman/v3/libpod/define"
"github.com/containers/podman/v3/pkg/rootless"
"github.com/containers/podman/v3/pkg/util"
v1 "github.com/opencontainers/image-spec/specs-go/v1"
spec "github.com/opencontainers/runtime-spec/specs-go"
"github.com/opencontainers/runtime-tools/generate"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
const (
// IDTruncLength is the length of the pod's id that will be used to make the
// infra container name
IDTruncLength = 12
)
func (r *Runtime) makeInfraContainer(ctx context.Context, p *Pod, imgName, rawImageName, imgID string, config *v1.ImageConfig) (*Container, error) {
// Set up generator for infra container defaults
g, err := generate.New("linux")
if err != nil {
return nil, err
}
// Set Pod hostname
g.Config.Hostname = p.config.Hostname
var options []CtrCreateOption
// Command: If user-specified, use that preferentially.
// If not set and the config file is set, fall back to that.
var infraCtrCommand []string
if p.config.InfraContainer.InfraCommand != nil {
logrus.Debugf("User-specified infra container entrypoint %v", p.config.InfraContainer.InfraCommand)
infraCtrCommand = p.config.InfraContainer.InfraCommand
} else if r.config.Engine.InfraCommand != "" {
logrus.Debugf("Config-specified infra container entrypoint %s", r.config.Engine.InfraCommand)
infraCtrCommand = []string{r.config.Engine.InfraCommand}
}
// Only if set by the user or containers.conf, we set entrypoint for the
// infra container.
// This is only used by commit, so it shouldn't matter... But someone
// may eventually want to commit an infra container?
// TODO: Should we actually do this if set by containers.conf?
if infraCtrCommand != nil {
// Need to duplicate the array - we are going to add Cmd later
// so the current array will be changed.
newArr := make([]string, 0, len(infraCtrCommand))
newArr = append(newArr, infraCtrCommand...)
options = append(options, WithEntrypoint(newArr))
}
isRootless := rootless.IsRootless()
// I've seen circumstances where config is being passed as nil.
// Let's err on the side of safety and make sure it's safe to use.
if config != nil {
if infraCtrCommand == nil {
// If we have no entrypoint and command from the image,
// we can't go on - the infra container has no command.
if len(config.Entrypoint) == 0 && len(config.Cmd) == 0 {
return nil, errors.Errorf("infra container has no command")
}
if len(config.Entrypoint) > 0 {
infraCtrCommand = config.Entrypoint
} else {
// Use the Docker default "/bin/sh -c"
// entrypoint, as we're overriding command.
// If an image doesn't want this, it can
// override entrypoint too.
infraCtrCommand = []string{"/bin/sh", "-c"}
}
}
if len(config.Cmd) > 0 {
infraCtrCommand = append(infraCtrCommand, config.Cmd...)
}
if len(config.Env) > 0 {
for _, nameValPair := range config.Env {
nameValSlice := strings.Split(nameValPair, "=")
if len(nameValSlice) < 2 {
return nil, errors.Errorf("Invalid environment variable structure in pause image")
}
g.AddProcessEnv(nameValSlice[0], nameValSlice[1])
}
}
switch {
case p.config.InfraContainer.HostNetwork:
if err := g.RemoveLinuxNamespace(string(spec.NetworkNamespace)); err != nil {
return nil, errors.Wrapf(err, "error removing network namespace from pod %s infra container", p.ID())
}
case p.config.InfraContainer.NoNetwork:
// Do nothing - we have a network namespace by default,
// but should not configure slirp.
default:
// Since user namespace sharing is not implemented, we only need to check if it's rootless
netmode := "bridge"
if p.config.InfraContainer.Slirp4netns {
netmode = "slirp4netns"
if len(p.config.InfraContainer.NetworkOptions) != 0 {
options = append(options, WithNetworkOptions(p.config.InfraContainer.NetworkOptions))
}
}
// PostConfigureNetNS should not be set since user namespace sharing is not implemented
// and rootless networking no longer supports post configuration setup
options = append(options, WithNetNS(p.config.InfraContainer.PortBindings, false, netmode, p.config.InfraContainer.Networks))
}
// For each option in InfraContainerConfig - if set, pass into
// the infra container we're creating with the appropriate
// With... option.
if p.config.InfraContainer.StaticIP != nil {
options = append(options, WithStaticIP(p.config.InfraContainer.StaticIP))
}
if p.config.InfraContainer.StaticMAC != nil {
options = append(options, WithStaticMAC(p.config.InfraContainer.StaticMAC))
}
if p.config.InfraContainer.UseImageResolvConf {
options = append(options, WithUseImageResolvConf())
}
if len(p.config.InfraContainer.DNSServer) > 0 {
options = append(options, WithDNS(p.config.InfraContainer.DNSServer))
}
if len(p.config.InfraContainer.DNSSearch) > 0 {
options = append(options, WithDNSSearch(p.config.InfraContainer.DNSSearch))
}
if len(p.config.InfraContainer.DNSOption) > 0 {
options = append(options, WithDNSOption(p.config.InfraContainer.DNSOption))
}
if p.config.InfraContainer.UseImageHosts {
options = append(options, WithUseImageHosts())
}
if len(p.config.InfraContainer.HostAdd) > 0 {
options = append(options, WithHosts(p.config.InfraContainer.HostAdd))
}
if len(p.config.InfraContainer.ExitCommand) > 0 {
options = append(options, WithExitCommand(p.config.InfraContainer.ExitCommand))
}
}
g.SetRootReadonly(true)
g.SetProcessArgs(infraCtrCommand)
logrus.Debugf("Using %q as infra container command", infraCtrCommand)
g.RemoveMount("/dev/shm")
if isRootless {
g.RemoveMount("/dev/pts")
devPts := spec.Mount{
Destination: "/dev/pts",
Type: "devpts",
Source: "devpts",
Options: []string{"private", "nosuid", "noexec", "newinstance", "ptmxmode=0666", "mode=0620"},
}
g.AddMount(devPts)
}
// Add default sysctls from containers.conf
defaultSysctls, err := util.ValidateSysctls(r.config.Sysctls())
if err != nil {
return nil, err
}
for sysctlKey, sysctlVal := range defaultSysctls {
// Ignore mqueue sysctls if not sharing IPC
if !p.config.UsePodIPC && strings.HasPrefix(sysctlKey, "fs.mqueue.") {
logrus.Infof("Sysctl %s=%s ignored in containers.conf, since IPC Namespace for pod is unused", sysctlKey, sysctlVal)
continue
}
// Ignore net sysctls if host network or not sharing network
if (p.config.InfraContainer.HostNetwork || !p.config.UsePodNet) && strings.HasPrefix(sysctlKey, "net.") {
logrus.Infof("Sysctl %s=%s ignored in containers.conf, since Network Namespace for pod is unused", sysctlKey, sysctlVal)
continue
}
// Ignore uts sysctls if not sharing UTS
if !p.config.UsePodUTS && (strings.HasPrefix(sysctlKey, "kernel.domainname") || strings.HasPrefix(sysctlKey, "kernel.hostname")) {
logrus.Infof("Sysctl %s=%s ignored in containers.conf, since UTS Namespace for pod is unused", sysctlKey, sysctlVal)
continue
}
g.AddLinuxSysctl(sysctlKey, sysctlVal)
}
containerName := p.ID()[:IDTruncLength] + "-infra"
options = append(options, r.WithPod(p))
options = append(options, WithRootFSFromImage(imgID, imgName, rawImageName))
options = append(options, WithName(containerName))
options = append(options, withIsInfra())
if len(p.config.InfraContainer.ConmonPidFile) > 0 {
options = append(options, WithConmonPidFile(p.config.InfraContainer.ConmonPidFile))
}
return r.newContainer(ctx, g.Config, options...)
}
// createInfraContainer wrap creates an infra container for a pod.
// An infra container becomes the basis for kernel namespace sharing between
// containers in the pod.
func (r *Runtime) createInfraContainer(ctx context.Context, p *Pod) (*Container, error) {
if !r.valid {
return nil, define.ErrRuntimeStopped
}
imageName := p.config.InfraContainer.InfraImage
if imageName == "" {
imageName = r.config.Engine.InfraImage
}
pulledImages, err := r.LibimageRuntime().Pull(ctx, imageName, config.PullPolicyMissing, nil)
if err != nil {
return nil, errors.Wrap(err, "error pulling infra-container image")
}
newImage := pulledImages[0]
data, err := newImage.Inspect(ctx, false)
if err != nil {
return nil, err
}
imageName = "none"
if len(newImage.Names()) > 0 {
imageName = newImage.Names()[0]
}
imageID := data.ID
return r.makeInfraContainer(ctx, p, imageName, r.config.Engine.InfraImage, imageID, data.Config)
}
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