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-rw-r--r--vendor/github.com/projectatomic/buildah/imagebuildah/build.go286
1 files changed, 270 insertions, 16 deletions
diff --git a/vendor/github.com/projectatomic/buildah/imagebuildah/build.go b/vendor/github.com/projectatomic/buildah/imagebuildah/build.go
index ce0734a2b..075e588ba 100644
--- a/vendor/github.com/projectatomic/buildah/imagebuildah/build.go
+++ b/vendor/github.com/projectatomic/buildah/imagebuildah/build.go
@@ -9,6 +9,7 @@ import (
"path/filepath"
"strconv"
"strings"
+ "time"
is "github.com/containers/image/storage"
"github.com/containers/image/transports"
@@ -20,6 +21,7 @@ import (
"github.com/containers/storage/pkg/stringid"
"github.com/docker/docker/builder/dockerfile/parser"
docker "github.com/fsouza/go-dockerclient"
+ "github.com/opencontainers/image-spec/specs-go/v1"
"github.com/opencontainers/runtime-spec/specs-go"
"github.com/openshift/imagebuilder"
"github.com/pkg/errors"
@@ -141,6 +143,11 @@ type BuildOptions struct {
Annotations []string
// OnBuild commands to be run by images based on this image
OnBuild []string
+ // Layers tells the builder to create a cache of images for each step in the Dockerfile
+ Layers bool
+ // NoCache tells the builder to build the image from scratch without checking for a cache.
+ // It creates a new set of cached images for the build.
+ NoCache bool
}
// Executor is a buildah-based implementation of the imagebuilder.Executor
@@ -187,6 +194,9 @@ type Executor struct {
labels []string
annotations []string
onbuild []string
+ layers bool
+ topLayers []string
+ noCache bool
}
// withName creates a new child executor that will be used whenever a COPY statement uses --from=NAME.
@@ -539,6 +549,8 @@ func NewExecutor(store storage.Store, options BuildOptions) (*Executor, error) {
squash: options.Squash,
labels: append([]string{}, options.Labels...),
annotations: append([]string{}, options.Annotations...),
+ layers: options.Layers,
+ noCache: options.NoCache,
}
if exec.err == nil {
exec.err = os.Stderr
@@ -646,6 +658,9 @@ func (b *Executor) Prepare(ctx context.Context, ib *imagebuilder.Builder, node *
}
b.mountPoint = mountPoint
b.builder = builder
+ // Add the top layer of this image to b.topLayers so we can keep track of them
+ // when building with cached images.
+ b.topLayers = append(b.topLayers, builder.TopLayer)
return nil
}
@@ -661,7 +676,9 @@ func (b *Executor) Delete() (err error) {
}
// Execute runs each of the steps in the parsed tree, in turn.
-func (b *Executor) Execute(ib *imagebuilder.Builder, node *parser.Node) error {
+func (b *Executor) Execute(ctx context.Context, ib *imagebuilder.Builder, node *parser.Node) error {
+ checkForLayers := true
+ children := node.Children
for i, node := range node.Children {
step := ib.Step()
if err := step.Resolve(node); err != nil {
@@ -675,42 +692,270 @@ func (b *Executor) Execute(ib *imagebuilder.Builder, node *parser.Node) error {
if i < len(node.Children)-1 {
requiresStart = ib.RequiresStart(&parser.Node{Children: node.Children[i+1:]})
}
- err := ib.Run(step, b, requiresStart)
- if err != nil {
- return errors.Wrapf(err, "error building at step %+v", *step)
+
+ if !b.layers && !b.noCache {
+ err := ib.Run(step, b, requiresStart)
+ if err != nil {
+ return errors.Wrapf(err, "error building at step %+v", *step)
+ }
+ continue
+ }
+
+ var (
+ cacheID string
+ err error
+ imgID string
+ )
+ // checkForLayers will be true if b.layers is true and a cached intermediate image is found.
+ // checkForLayers is set to false when either there is no cached image or a break occurs where
+ // the instructions in the Dockerfile change from a previous build.
+ // Don't check for cache if b.noCache is set to true.
+ if checkForLayers && !b.noCache {
+ cacheID, err = b.layerExists(ctx, node, children[:i])
+ if err != nil {
+ return errors.Wrap(err, "error checking if cached image exists from a previous build")
+ }
+ }
+ if cacheID == "" || !checkForLayers {
+ checkForLayers = false
+ err := ib.Run(step, b, requiresStart)
+ if err != nil {
+ return errors.Wrapf(err, "error building at step %+v", *step)
+ }
+ } else {
+ b.log("Using cache %s", cacheID)
+ }
+ // Commit if at the last step of the Dockerfile and a cached image is found.
+ // Also commit steps if no cache is found.
+ if (cacheID != "" && i == len(children)-1) || cacheID == "" {
+ imgID, err = b.Commit(ctx, ib, getCreatedBy(node))
+ if err != nil {
+ return errors.Wrapf(err, "error committing container for step %+v", *step)
+ }
+ if i == len(children)-1 {
+ b.log("COMMIT %s", b.output)
+ }
+ } else {
+ // Cache is found, assign imgID the id of the cached image so
+ // it is used to create the container for the next step.
+ imgID = cacheID
+ }
+ // Delete the intermediate container.
+ if err := b.Delete(); err != nil {
+ return errors.Wrap(err, "error deleting intermediate container")
+ }
+ // Prepare for the next step with imgID as the new base image.
+ if i != len(children)-1 {
+ if err := b.Prepare(ctx, ib, node, imgID); err != nil {
+ return errors.Wrap(err, "error preparing container for next step")
+ }
}
}
return nil
}
+// layerExists returns true if an intermediate image of currNode exists in the image store from a previous build.
+// It verifies tihis by checking the parent of the top layer of the image and the history.
+func (b *Executor) layerExists(ctx context.Context, currNode *parser.Node, children []*parser.Node) (string, error) {
+ // Get the list of images available in the image store
+ images, err := b.store.Images()
+ if err != nil {
+ return "", errors.Wrap(err, "error getting image list from store")
+ }
+ for _, image := range images {
+ layer, err := b.store.Layer(image.TopLayer)
+ if err != nil {
+ return "", errors.Wrapf(err, "error getting top layer info")
+ }
+ // If the parent of the top layer of an image is equal to the last entry in b.topLayers
+ // it means that this image is potentially a cached intermediate image from a previous
+ // build. Next we double check that the history of this image is equivalent to the previous
+ // lines in the Dockerfile up till the point we are at in the build.
+ if layer.Parent == b.topLayers[len(b.topLayers)-1] {
+ history, err := b.getImageHistory(ctx, image.ID)
+ if err != nil {
+ return "", errors.Wrapf(err, "error getting history of %q", image.ID)
+ }
+ // children + currNode is the point of the Dockerfile we are currently at.
+ if historyMatches(append(children, currNode), history) {
+ // This checks if the files copied during build have been changed if the node is
+ // a COPY or ADD command.
+ filesMatch, err := b.copiedFilesMatch(currNode, history[len(history)-1].Created)
+ if err != nil {
+ return "", errors.Wrapf(err, "error checking if copied files match")
+ }
+ if filesMatch {
+ return image.ID, nil
+ }
+ }
+ }
+ }
+ return "", nil
+}
+
+// getImageHistory returns the history of imageID.
+func (b *Executor) getImageHistory(ctx context.Context, imageID string) ([]v1.History, error) {
+ imageRef, err := is.Transport.ParseStoreReference(b.store, "@"+imageID)
+ if err != nil {
+ return nil, errors.Wrapf(err, "error getting image reference %q", imageID)
+ }
+ ref, err := imageRef.NewImage(ctx, nil)
+ if err != nil {
+ return nil, errors.Wrap(err, "error creating new image from reference")
+ }
+ oci, err := ref.OCIConfig(ctx)
+ if err != nil {
+ return nil, errors.Wrapf(err, "error getting oci config of image %q", imageID)
+ }
+ return oci.History, nil
+}
+
+// getCreatedBy returns the command the image at node will be created by.
+func getCreatedBy(node *parser.Node) string {
+ if node.Value == "run" {
+ return "/bin/sh -c " + node.Original[4:]
+ }
+ return "/bin/sh -c #(nop) " + node.Original
+}
+
+// historyMatches returns true if the history of the image matches the lines
+// in the Dockerfile till the point of build we are at.
+// Used to verify whether a cache of the intermediate image exists and whether
+// to run the build again.
+func historyMatches(children []*parser.Node, history []v1.History) bool {
+ i := len(history) - 1
+ for j := len(children) - 1; j >= 0; j-- {
+ instruction := children[j].Original
+ if children[j].Value == "run" {
+ instruction = instruction[4:]
+ }
+ if !strings.Contains(history[i].CreatedBy, instruction) {
+ return false
+ }
+ i--
+ }
+ return true
+}
+
+// getFilesToCopy goes through node to get all the src files that are copied, added or downloaded.
+// It is possible for the Dockerfile to have src as hom*, which means all files that have hom as a prefix.
+// Another format is hom?.txt, which means all files that have that name format with the ? replaced by another character.
+func (b *Executor) getFilesToCopy(node *parser.Node) ([]string, error) {
+ currNode := node.Next
+ var src []string
+ for currNode.Next != nil {
+ if currNode.Next == nil {
+ break
+ }
+ if strings.HasPrefix(currNode.Value, "http://") || strings.HasPrefix(currNode.Value, "https://") {
+ src = append(src, currNode.Value)
+ continue
+ }
+ matches, err := filepath.Glob(filepath.Join(b.contextDir, currNode.Value))
+ if err != nil {
+ return nil, errors.Wrapf(err, "error finding match for pattern %q", currNode.Value)
+ }
+ src = append(src, matches...)
+ currNode = currNode.Next
+ }
+ return src, nil
+}
+
+// copiedFilesMatch checks to see if the node instruction is a COPY or ADD.
+// If it is either of those two it checks the timestamps on all the files copied/added
+// by the dockerfile. If the host version has a time stamp greater than the time stamp
+// of the build, the build will not use the cached version and will rebuild.
+func (b *Executor) copiedFilesMatch(node *parser.Node, historyTime *time.Time) (bool, error) {
+ if node.Value != "add" && node.Value != "copy" {
+ return true, nil
+ }
+
+ src, err := b.getFilesToCopy(node)
+ if err != nil {
+ return false, err
+ }
+ for _, item := range src {
+ // for urls, check the Last-Modified field in the header.
+ if strings.HasPrefix(item, "http://") || strings.HasPrefix(item, "https://") {
+ urlContentNew, err := urlContentModified(item, historyTime)
+ if err != nil {
+ return false, err
+ }
+ if urlContentNew {
+ return false, nil
+ }
+ continue
+ }
+ // For local files, walk the file tree and check the time stamps.
+ timeIsGreater := false
+ err := filepath.Walk(item, func(path string, info os.FileInfo, err error) error {
+ if info.ModTime().After(*historyTime) {
+ timeIsGreater = true
+ return nil
+ }
+ return nil
+ })
+ if err != nil {
+ return false, errors.Wrapf(err, "error walking file tree %q", item)
+ }
+ if timeIsGreater {
+ return false, nil
+ }
+ }
+ return true, nil
+}
+
+// urlContentModified sends a get request to the url and checks if the header has a value in
+// Last-Modified, and if it does compares the time stamp to that of the history of the cached image.
+// returns true if there is no Last-Modified value in the header.
+func urlContentModified(url string, historyTime *time.Time) (bool, error) {
+ resp, err := http.Get(url)
+ if err != nil {
+ return false, errors.Wrapf(err, "error getting %q", url)
+ }
+ if lastModified := resp.Header.Get("Last-Modified"); lastModified != "" {
+ lastModifiedTime, err := time.Parse(time.RFC1123, lastModified)
+ if err != nil {
+ return false, errors.Wrapf(err, "error parsing time for %q", url)
+ }
+ return lastModifiedTime.After(*historyTime), nil
+ }
+ logrus.Debugf("Response header did not have Last-Modified %q, will rebuild.", url)
+ return true, nil
+}
+
// Commit writes the container's contents to an image, using a passed-in tag as
// the name if there is one, generating a unique ID-based one otherwise.
-func (b *Executor) Commit(ctx context.Context, ib *imagebuilder.Builder) (err error) {
- var imageRef types.ImageReference
+func (b *Executor) Commit(ctx context.Context, ib *imagebuilder.Builder, createdBy string) (string, error) {
+ var (
+ imageRef types.ImageReference
+ err error
+ )
if b.output != "" {
imageRef, err = alltransports.ParseImageName(b.output)
if err != nil {
candidates := util.ResolveName(b.output, "", b.systemContext, b.store)
if len(candidates) == 0 {
- return errors.Errorf("error parsing target image name %q", b.output)
+ return "", errors.Errorf("error parsing target image name %q", b.output)
}
imageRef2, err2 := is.Transport.ParseStoreReference(b.store, candidates[0])
if err2 != nil {
- return errors.Wrapf(err, "error parsing target image name %q", b.output)
+ return "", errors.Wrapf(err, "error parsing target image name %q", b.output)
}
imageRef = imageRef2
}
} else {
imageRef, err = is.Transport.ParseStoreReference(b.store, "@"+stringid.GenerateRandomID())
if err != nil {
- return errors.Wrapf(err, "error parsing reference for image to be written")
+ return "", errors.Wrapf(err, "error parsing reference for image to be written")
}
}
if ib.Author != "" {
b.builder.SetMaintainer(ib.Author)
}
config := ib.Config()
+ b.builder.SetCreatedBy(createdBy)
b.builder.SetHostname(config.Hostname)
b.builder.SetDomainname(config.Domainname)
b.builder.SetUser(config.User)
@@ -758,32 +1003,37 @@ func (b *Executor) Commit(ctx context.Context, ib *imagebuilder.Builder) (err er
if imageRef != nil {
logName := transports.ImageName(imageRef)
logrus.Debugf("COMMIT %q", logName)
- if !b.quiet {
+ if !b.quiet && !b.layers && !b.noCache {
b.log("COMMIT %s", logName)
}
} else {
logrus.Debugf("COMMIT")
- if !b.quiet {
+ if !b.quiet && !b.layers && !b.noCache {
b.log("COMMIT")
}
}
+ writer := b.reportWriter
+ if b.layers || b.noCache {
+ writer = nil
+ }
options := buildah.CommitOptions{
Compression: b.compression,
SignaturePolicyPath: b.signaturePolicyPath,
AdditionalTags: b.additionalTags,
- ReportWriter: b.reportWriter,
+ ReportWriter: writer,
PreferredManifestType: b.outputFormat,
IIDFile: b.iidfile,
Squash: b.squash,
+ Parent: b.builder.FromImageID,
}
imgID, err := b.builder.Commit(ctx, imageRef, options)
if err != nil {
- return err
+ return "", err
}
if options.IIDFile == "" && imgID != "" {
fmt.Fprintf(b.out, "%s\n", imgID)
}
- return nil
+ return imgID, nil
}
// Build takes care of the details of running Prepare/Execute/Commit/Delete
@@ -799,11 +1049,15 @@ func (b *Executor) Build(ctx context.Context, stages imagebuilder.Stages) error
return err
}
defer stageExecutor.Delete()
- if err := stageExecutor.Execute(stage.Builder, stage.Node); err != nil {
+ if err := stageExecutor.Execute(ctx, stage.Builder, stage.Node); err != nil {
return err
}
}
- return stageExecutor.Commit(ctx, stages[len(stages)-1].Builder)
+ if b.layers || b.noCache {
+ return nil
+ }
+ _, err := stageExecutor.Commit(ctx, stages[len(stages)-1].Builder, "")
+ return err
}
// BuildDockerfiles parses a set of one or more Dockerfiles (which may be
generated by cgit v1.2.3-54-g00ecf (git 2.39.0) at 2024-12-27 07:55:49 +0000