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new.go
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package buildah
import (
"context"
"fmt"
"math/rand"
"strings"
"time"
"github.com/containers/buildah/util"
"github.com/containers/image/v5/image"
"github.com/containers/image/v5/manifest"
"github.com/containers/image/v5/pkg/sysregistriesv2"
is "github.com/containers/image/v5/storage"
"github.com/containers/image/v5/transports"
"github.com/containers/image/v5/transports/alltransports"
"github.com/containers/image/v5/types"
"github.com/containers/storage"
digest "github.com/opencontainers/go-digest"
"github.com/openshift/imagebuilder"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
const (
// BaseImageFakeName is the "name" of a source image which we interpret
// as "no image".
BaseImageFakeName = imagebuilder.NoBaseImageSpecifier
)
func pullAndFindImage(ctx context.Context, store storage.Store, srcRef types.ImageReference, options BuilderOptions, sc *types.SystemContext) (*storage.Image, types.ImageReference, error) {
pullOptions := PullOptions{
ReportWriter: options.ReportWriter,
Store: store,
SystemContext: options.SystemContext,
BlobDirectory: options.BlobDirectory,
MaxRetries: options.MaxPullRetries,
RetryDelay: options.PullRetryDelay,
OciDecryptConfig: options.OciDecryptConfig,
}
ref, err := pullImage(ctx, store, srcRef, pullOptions, sc)
if err != nil {
logrus.Debugf("error pulling image %q: %v", transports.ImageName(srcRef), err)
return nil, nil, err
}
img, err := is.Transport.GetStoreImage(store, ref)
if err != nil {
logrus.Debugf("error reading pulled image %q: %v", transports.ImageName(srcRef), err)
return nil, nil, errors.Wrapf(err, "error locating image %q in local storage", transports.ImageName(ref))
}
return img, ref, nil
}
func getImageName(name string, img *storage.Image) string {
imageName := name
if len(img.Names) > 0 {
imageName = img.Names[0]
// When the image used by the container is a tagged image
// the container name might be set to the original image instead of
// the image given in the "from" command line.
// This loop is supposed to fix this.
for _, n := range img.Names {
if strings.Contains(n, name) {
imageName = n
break
}
}
}
return imageName
}
func imageNamePrefix(imageName string) string {
prefix := imageName
s := strings.Split(prefix, ":")
if len(s) > 0 {
prefix = s[0]
}
s = strings.Split(prefix, "/")
if len(s) > 0 {
prefix = s[len(s)-1]
}
s = strings.Split(prefix, "@")
if len(s) > 0 {
prefix = s[0]
}
return prefix
}
func newContainerIDMappingOptions(idmapOptions *IDMappingOptions) storage.IDMappingOptions {
var options storage.IDMappingOptions
if idmapOptions != nil {
options.HostUIDMapping = idmapOptions.HostUIDMapping
options.HostGIDMapping = idmapOptions.HostGIDMapping
uidmap, gidmap := convertRuntimeIDMaps(idmapOptions.UIDMap, idmapOptions.GIDMap)
if len(uidmap) > 0 && len(gidmap) > 0 {
options.UIDMap = uidmap
options.GIDMap = gidmap
} else {
options.HostUIDMapping = true
options.HostGIDMapping = true
}
}
return options
}
func resolveImage(ctx context.Context, systemContext *types.SystemContext, store storage.Store, options BuilderOptions) (types.ImageReference, string, *storage.Image, error) {
type failure struct {
resolvedImageName string
err error
}
candidates, transport, searchRegistriesWereUsedButEmpty, err := util.ResolveName(options.FromImage, options.Registry, systemContext, store)
if err != nil {
return nil, "", nil, errors.Wrapf(err, "error parsing reference to image %q", options.FromImage)
}
failures := []failure{}
for _, image := range candidates {
if transport == "" {
img, err := store.Image(image)
if err != nil {
logrus.Debugf("error looking up known-local image %q: %v", image, err)
failures = append(failures, failure{resolvedImageName: image, err: err})
continue
}
ref, err := is.Transport.ParseStoreReference(store, img.ID)
if err != nil {
return nil, "", nil, errors.Wrapf(err, "error parsing reference to image %q", img.ID)
}
return ref, transport, img, nil
}
trans := transport
if transport != util.DefaultTransport {
trans = trans + ":"
}
srcRef, err := alltransports.ParseImageName(trans + image)
if err != nil {
logrus.Debugf("error parsing image name %q: %v", trans+image, err)
failures = append(failures, failure{
resolvedImageName: image,
err: errors.Wrapf(err, "error parsing attempted image name %q", trans+image),
})
continue
}
if options.PullPolicy == PullAlways {
pulledImg, pulledReference, err := pullAndFindImage(ctx, store, srcRef, options, systemContext)
if err != nil {
logrus.Debugf("unable to pull and read image %q: %v", image, err)
failures = append(failures, failure{resolvedImageName: image, err: err})
continue
}
return pulledReference, transport, pulledImg, nil
}
destImage, err := localImageNameForReference(ctx, store, srcRef)
if err != nil {
return nil, "", nil, errors.Wrapf(err, "error computing local image name for %q", transports.ImageName(srcRef))
}
if destImage == "" {
return nil, "", nil, errors.Errorf("error computing local image name for %q", transports.ImageName(srcRef))
}
ref, err := is.Transport.ParseStoreReference(store, destImage)
if err != nil {
return nil, "", nil, errors.Wrapf(err, "error parsing reference to image %q", destImage)
}
if options.PullPolicy == PullIfNewer {
img, err := is.Transport.GetStoreImage(store, ref)
if err == nil {
// Let's see if this image is on the repository and if it's there
// then note it's Created date.
var repoImageCreated time.Time
repoImageFound := false
repoImage, err := srcRef.NewImage(ctx, systemContext)
if err == nil {
inspect, err := repoImage.Inspect(ctx)
if err == nil {
repoImageFound = true
repoImageCreated = *inspect.Created
}
repoImage.Close()
}
if !repoImageFound || repoImageCreated == img.Created {
// The image is only local or the same date is on the
// local and repo versions of the image, no need to pull.
return ref, transport, img, nil
}
}
} else {
// Get the image from the store if present for PullNever and PullIfMissing
img, err := is.Transport.GetStoreImage(store, ref)
if err == nil {
return ref, transport, img, nil
}
if errors.Cause(err) == storage.ErrImageUnknown && options.PullPolicy == PullNever {
logrus.Debugf("no such image %q: %v", transports.ImageName(ref), err)
failures = append(failures, failure{
resolvedImageName: image,
err: errors.Errorf("no such image %q", transports.ImageName(ref)),
})
continue
}
}
pulledImg, pulledReference, err := pullAndFindImage(ctx, store, srcRef, options, systemContext)
if err != nil {
logrus.Debugf("unable to pull and read image %q: %v", image, err)
failures = append(failures, failure{resolvedImageName: image, err: err})
continue
}
return pulledReference, transport, pulledImg, nil
}
if len(failures) != len(candidates) {
return nil, "", nil, errors.Errorf("internal error: %d candidates (%#v) vs. %d failures (%#v)", len(candidates), candidates, len(failures), failures)
}
registriesConfPath := sysregistriesv2.ConfigPath(systemContext)
switch len(failures) {
case 0:
if searchRegistriesWereUsedButEmpty {
return nil, "", nil, errors.Errorf("image name %q is a short name and no search registries are defined in %s.", options.FromImage, registriesConfPath)
}
return nil, "", nil, errors.Errorf("internal error: no pull candidates were available for %q for an unknown reason", options.FromImage)
case 1:
err := failures[0].err
if failures[0].resolvedImageName != options.FromImage {
err = errors.Wrapf(err, "while pulling %q as %q", options.FromImage, failures[0].resolvedImageName)
}
if searchRegistriesWereUsedButEmpty {
err = errors.Wrapf(err, "(image name %q is a short name and no search registries are defined in %s)", options.FromImage, registriesConfPath)
}
return nil, "", nil, err
default:
// NOTE: a multi-line error string:
e := fmt.Sprintf("The following failures happened while trying to pull image specified by %q based on search registries in %s:", options.FromImage, registriesConfPath)
for _, f := range failures {
e = e + fmt.Sprintf("\n* %q: %s", f.resolvedImageName, f.err.Error())
}
return nil, "", nil, errors.New(e)
}
}
func containerNameExist(name string, containers []storage.Container) bool {
for _, container := range containers {
for _, cname := range container.Names {
if cname == name {
return true
}
}
}
return false
}
func findUnusedContainer(name string, containers []storage.Container) string {
suffix := 1
tmpName := name
for containerNameExist(tmpName, containers) {
tmpName = fmt.Sprintf("%s-%d", name, suffix)
suffix++
}
return tmpName
}
func newBuilder(ctx context.Context, store storage.Store, options BuilderOptions) (*Builder, error) {
var (
ref types.ImageReference
img *storage.Image
err error
)
if options.FromImage == BaseImageFakeName {
options.FromImage = ""
}
systemContext := getSystemContext(store, options.SystemContext, options.SignaturePolicyPath)
if options.FromImage != "" && options.FromImage != "scratch" {
ref, _, img, err = resolveImage(ctx, systemContext, store, options)
if err != nil {
return nil, err
}
}
imageSpec := options.FromImage
imageID := ""
imageDigest := ""
topLayer := ""
if img != nil {
imageSpec = getImageName(imageNamePrefix(imageSpec), img)
imageID = img.ID
topLayer = img.TopLayer
}
var src types.Image
if ref != nil {
srcSrc, err := ref.NewImageSource(ctx, systemContext)
if err != nil {
return nil, errors.Wrapf(err, "error instantiating image for %q", transports.ImageName(ref))
}
defer srcSrc.Close()
manifestBytes, manifestType, err := srcSrc.GetManifest(ctx, nil)
if err != nil {
return nil, errors.Wrapf(err, "error loading image manifest for %q", transports.ImageName(ref))
}
if manifestDigest, err := manifest.Digest(manifestBytes); err == nil {
imageDigest = manifestDigest.String()
}
var instanceDigest *digest.Digest
if manifest.MIMETypeIsMultiImage(manifestType) {
list, err := manifest.ListFromBlob(manifestBytes, manifestType)
if err != nil {
return nil, errors.Wrapf(err, "error parsing image manifest for %q as list", transports.ImageName(ref))
}
instance, err := list.ChooseInstance(systemContext)
if err != nil {
return nil, errors.Wrapf(err, "error finding an appropriate image in manifest list %q", transports.ImageName(ref))
}
instanceDigest = &instance
}
src, err = image.FromUnparsedImage(ctx, systemContext, image.UnparsedInstance(srcSrc, instanceDigest))
if err != nil {
return nil, errors.Wrapf(err, "error instantiating image for %q instance %q", transports.ImageName(ref), instanceDigest)
}
}
name := "working-container"
if options.Container != "" {
name = options.Container
} else {
if imageSpec != "" {
name = imageNamePrefix(imageSpec) + "-" + name
}
}
var container *storage.Container
tmpName := name
if options.Container == "" {
containers, err := store.Containers()
if err != nil {
return nil, errors.Wrapf(err, "unable to check for container names")
}
tmpName = findUnusedContainer(tmpName, containers)
}
conflict := 100
for {
coptions := storage.ContainerOptions{
LabelOpts: options.CommonBuildOpts.LabelOpts,
IDMappingOptions: newContainerIDMappingOptions(options.IDMappingOptions),
}
container, err = store.CreateContainer("", []string{tmpName}, imageID, "", "", &coptions)
if err == nil {
name = tmpName
break
}
if errors.Cause(err) != storage.ErrDuplicateName || options.Container != "" {
return nil, errors.Wrapf(err, "error creating container")
}
tmpName = fmt.Sprintf("%s-%d", name, rand.Int()%conflict)
conflict = conflict * 10
}
defer func() {
if err != nil {
if err2 := store.DeleteContainer(container.ID); err2 != nil {
logrus.Errorf("error deleting container %q: %v", container.ID, err2)
}
}
}()
uidmap, gidmap := convertStorageIDMaps(container.UIDMap, container.GIDMap)
defaultNamespaceOptions, err := DefaultNamespaceOptions()
if err != nil {
return nil, err
}
namespaceOptions := defaultNamespaceOptions
namespaceOptions.AddOrReplace(options.NamespaceOptions...)
builder := &Builder{
store: store,
Type: containerType,
FromImage: imageSpec,
FromImageID: imageID,
FromImageDigest: imageDigest,
Container: name,
ContainerID: container.ID,
ImageAnnotations: map[string]string{},
ImageCreatedBy: "",
ProcessLabel: container.ProcessLabel(),
MountLabel: container.MountLabel(),
DefaultMountsFilePath: options.DefaultMountsFilePath,
Isolation: options.Isolation,
NamespaceOptions: namespaceOptions,
ConfigureNetwork: options.ConfigureNetwork,
CNIPluginPath: options.CNIPluginPath,
CNIConfigDir: options.CNIConfigDir,
IDMappingOptions: IDMappingOptions{
HostUIDMapping: len(uidmap) == 0,
HostGIDMapping: len(uidmap) == 0,
UIDMap: uidmap,
GIDMap: gidmap,
},
Capabilities: copyStringSlice(options.Capabilities),
CommonBuildOpts: options.CommonBuildOpts,
TopLayer: topLayer,
Args: options.Args,
Format: options.Format,
TempVolumes: map[string]bool{},
Devices: options.Devices,
}
if options.Mount {
_, err = builder.Mount(container.MountLabel())
if err != nil {
return nil, errors.Wrapf(err, "error mounting build container %q", builder.ContainerID)
}
}
if err := builder.initConfig(ctx, src); err != nil {
return nil, errors.Wrapf(err, "error preparing image configuration")
}
err = builder.Save()
if err != nil {
return nil, errors.Wrapf(err, "error saving builder state for container %q", builder.ContainerID)
}
return builder, nil
}