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package libpod
import (
"context"
"fmt"
"strings"
"github.com/containers/buildah"
"github.com/containers/common/libimage"
is "github.com/containers/image/v5/storage"
"github.com/containers/image/v5/types"
"github.com/containers/podman/v3/libpod/define"
"github.com/containers/podman/v3/libpod/events"
libpodutil "github.com/containers/podman/v3/pkg/util"
"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
IncludeVolumes bool
Author string
Message string
Changes []string
}
// 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) (*libimage.Image, error) {
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 == define.ContainerStateRunning && options.Pause {
if err := c.pause(); err != nil {
return nil, errors.Wrapf(err, "error pausing container %q to commit", c.ID())
}
defer func() {
if err := c.unpause(); err != nil {
logrus.Errorf("error unpausing container %q: %v", c.ID(), err)
}
}()
}
builderOptions := buildah.ImportOptions{
Container: c.ID(),
SignaturePolicyPath: options.SignaturePolicyPath,
}
commitOptions := buildah.CommitOptions{
SignaturePolicyPath: options.SignaturePolicyPath,
ReportWriter: options.ReportWriter,
SystemContext: c.runtime.imageContext,
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.SplitN(e, "=", 2)
importBuilder.SetEnv(splitEnv[0], splitEnv[1])
}
}
// Expose ports
for _, p := range c.config.PortMappings {
importBuilder.SetPort(fmt.Sprintf("%d/%s", p.ContainerPort, p.Protocol))
}
// Labels
for k, v := range c.Labels() {
importBuilder.SetLabel(k, v)
}
// No stop signal
// User
if c.config.User != "" {
importBuilder.SetUser(c.config.User)
}
// Volumes
if options.IncludeVolumes {
for _, v := range c.config.UserVolumes {
if v != "" {
importBuilder.AddVolume(v)
}
}
} else {
// Only include anonymous named volumes added by the user by
// default.
for _, v := range c.config.NamedVolumes {
include := false
for _, userVol := range c.config.UserVolumes {
if userVol == v.Dest {
include = true
break
}
}
if include {
vol, err := c.runtime.GetVolume(v.Name)
if err != nil {
return nil, errors.Wrapf(err, "volume %s used in container %s has been removed", v.Name, c.ID())
}
if vol.Anonymous() {
importBuilder.AddVolume(v.Dest)
}
}
}
}
// Workdir
importBuilder.SetWorkDir(c.config.Spec.Process.Cwd)
// Process user changes
newImageConfig, err := libpodutil.GetImageConfig(options.Changes)
if err != nil {
return nil, err
}
if newImageConfig.User != "" {
importBuilder.SetUser(newImageConfig.User)
}
// EXPOSE only appends
for port := range newImageConfig.ExposedPorts {
importBuilder.SetPort(port)
}
// ENV only appends
for _, env := range newImageConfig.Env {
splitEnv := strings.SplitN(env, "=", 2)
key := splitEnv[0]
value := ""
if len(splitEnv) == 2 {
value = splitEnv[1]
}
importBuilder.SetEnv(key, value)
}
if newImageConfig.Entrypoint != nil {
importBuilder.SetEntrypoint(newImageConfig.Entrypoint)
}
if newImageConfig.Cmd != nil {
importBuilder.SetCmd(newImageConfig.Cmd)
}
// VOLUME only appends
for vol := range newImageConfig.Volumes {
importBuilder.AddVolume(vol)
}
if newImageConfig.WorkingDir != "" {
importBuilder.SetWorkDir(newImageConfig.WorkingDir)
}
for k, v := range newImageConfig.Labels {
importBuilder.SetLabel(k, v)
}
if newImageConfig.StopSignal != "" {
importBuilder.SetStopSignal(newImageConfig.StopSignal)
}
for _, onbuild := range newImageConfig.OnBuild {
importBuilder.SetOnBuild(onbuild)
}
var commitRef types.ImageReference
if destImage != "" {
// Now resolve the name.
resolvedImageName, err := c.runtime.LibimageRuntime().ResolveName(destImage)
if err != nil {
return nil, err
}
imageRef, err := is.Transport.ParseStoreReference(c.runtime.store, resolvedImageName)
if err != nil {
return nil, errors.Wrapf(err, "error parsing target image name %q", destImage)
}
commitRef = imageRef
}
id, _, _, err := importBuilder.Commit(ctx, commitRef, commitOptions)
if err != nil {
return nil, err
}
defer c.newContainerEvent(events.Commit)
img, _, err := c.runtime.libimageRuntime.LookupImage(id, nil)
if err != nil {
return nil, err
}
return img, nil
}
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