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package libpod
import (
"context"
"fmt"
"strings"
"github.com/containers/buildah"
"github.com/containers/buildah/util"
is "github.com/containers/image/storage"
"github.com/containers/libpod/libpod/image"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
// ContainerCommitOptions is a struct used to commit a container to an image
// It uses buildah's CommitOptions as a base. Long-term we might wish to
// add these to the buildah struct once buildah is more integrated with
//libpod
type ContainerCommitOptions struct {
buildah.CommitOptions
Pause bool
Author string
Message string
Changes []string
}
// ChangeCmds is the list of valid Changes commands to passed to the Commit call
var ChangeCmds = []string{"CMD", "ENTRYPOINT", "ENV", "EXPOSE", "LABEL", "ONBUILD", "STOPSIGNAL", "USER", "VOLUME", "WORKDIR"}
// Commit commits the changes between a container and its image, creating a new
// image
func (c *Container) Commit(ctx context.Context, destImage string, options ContainerCommitOptions) (*image.Image, error) {
var (
isEnvCleared, isLabelCleared, isExposeCleared, isVolumeCleared bool
)
if c.config.Rootfs != "" {
return nil, errors.Errorf("cannot commit a container that uses an exploded rootfs")
}
if !c.batched {
c.lock.Lock()
defer c.lock.Unlock()
if err := c.syncContainer(); err != nil {
return nil, err
}
}
if c.state.State == ContainerStateRunning && options.Pause {
if err := c.runtime.ociRuntime.pauseContainer(c); err != nil {
return nil, errors.Wrapf(err, "error pausing container %q", c.ID())
}
defer func() {
if err := c.runtime.ociRuntime.unpauseContainer(c); err != nil {
logrus.Errorf("error unpausing container %q: %v", c.ID(), err)
}
}()
}
sc := image.GetSystemContext(options.SignaturePolicyPath, "", false)
builderOptions := buildah.ImportOptions{
Container: c.ID(),
SignaturePolicyPath: options.SignaturePolicyPath,
}
commitOptions := buildah.CommitOptions{
SignaturePolicyPath: options.SignaturePolicyPath,
ReportWriter: options.ReportWriter,
SystemContext: sc,
PreferredManifestType: options.PreferredManifestType,
}
importBuilder, err := buildah.ImportBuilder(ctx, c.runtime.store, builderOptions)
if err != nil {
return nil, err
}
if options.Author != "" {
importBuilder.SetMaintainer(options.Author)
}
if options.Message != "" {
importBuilder.SetComment(options.Message)
}
// We need to take meta we find in the current container and
// add it to the resulting image.
// Entrypoint - always set this first or cmd will get wiped out
importBuilder.SetEntrypoint(c.config.Entrypoint)
// Cmd
importBuilder.SetCmd(c.config.Command)
// Env
// TODO - this includes all the default environment vars as well
// Should we store the ENV we actually want in the spec separately?
if c.config.Spec.Process != nil {
for _, e := range c.config.Spec.Process.Env {
splitEnv := strings.Split(e, "=")
importBuilder.SetEnv(splitEnv[0], splitEnv[1])
}
}
// Expose ports
for _, p := range c.config.PortMappings {
importBuilder.SetPort(fmt.Sprintf("%d", p.ContainerPort))
}
// Labels
for k, v := range c.Labels() {
importBuilder.SetLabel(k, v)
}
// No stop signal
// User
importBuilder.SetUser(c.User())
// Volumes
for _, v := range c.config.UserVolumes {
if v != "" {
importBuilder.AddVolume(v)
}
}
// Workdir
importBuilder.SetWorkDir(c.Spec().Process.Cwd)
// Process user changes
for _, change := range options.Changes {
splitChange := strings.Split(change, "=")
switch strings.ToUpper(splitChange[0]) {
case "CMD":
importBuilder.SetCmd(splitChange[1:])
case "ENTRYPOINT":
importBuilder.SetEntrypoint(splitChange[1:])
case "ENV":
if !isEnvCleared { // Multiple values are valid, only clear once.
importBuilder.ClearEnv()
isEnvCleared = true
}
importBuilder.SetEnv(splitChange[1], splitChange[2])
case "EXPOSE":
if !isExposeCleared { // Multiple values are valid, only clear once
importBuilder.ClearPorts()
isExposeCleared = true
}
importBuilder.SetPort(splitChange[1])
case "LABEL":
if !isLabelCleared { // multiple values are valid, only clear once
importBuilder.ClearLabels()
isLabelCleared = true
}
importBuilder.SetLabel(splitChange[1], splitChange[2])
case "ONBUILD":
importBuilder.SetOnBuild(splitChange[1])
case "STOPSIGNAL":
// No Set StopSignal
case "USER":
importBuilder.SetUser(splitChange[1])
case "VOLUME":
if !isVolumeCleared { // multiple values are valid, only clear once
importBuilder.ClearVolumes()
isVolumeCleared = true
}
importBuilder.AddVolume(splitChange[1])
case "WORKDIR":
importBuilder.SetWorkDir(splitChange[1])
}
}
candidates, _, _, err := util.ResolveName(destImage, "", sc, c.runtime.store)
if err != nil {
return nil, errors.Wrapf(err, "error resolving name %q", destImage)
}
if len(candidates) == 0 {
return nil, errors.Errorf("error parsing target image name %q", destImage)
}
imageRef, err := is.Transport.ParseStoreReference(c.runtime.store, candidates[0])
if err != nil {
return nil, errors.Wrapf(err, "error parsing target image name %q", destImage)
}
id, _, _, err := importBuilder.Commit(ctx, imageRef, commitOptions)
if err != nil {
return nil, err
}
return c.runtime.imageRuntime.NewFromLocal(id)
}
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