// BuildConfig adds a graph node for the specific build config if it does not exist,
// and will link the build config to other nodes for the images and source repositories
// it depends on.
func BuildConfig(g MutableUniqueGraph, config *build.BuildConfig) graph.Node {
node, found := g.FindOrCreate(
UniqueName(fmt.Sprintf("%d|%s/%s", BuildConfigGraphKind, config.Namespace, config.Name)),
func(node Node) graph.Node {
return &BuildConfigNode{
Node: node,
BuildConfig: config,
}
},
)
if found {
return node
}
output := config.Parameters.Output
to := output.To
switch {
case to != nil && len(to.Name) > 0:
out := ImageStreamTag(g, defaultNamespace(to.Namespace, config.Namespace), to.Name, output.Tag)
g.AddEdge(node, out, BuildOutputGraphEdgeKind)
case len(output.DockerImageReference) > 0:
out := DockerRepository(g, output.DockerImageReference, output.Tag)
g.AddEdge(node, out, BuildOutputGraphEdgeKind)
}
if in, ok := SourceRepository(g, config.Parameters.Source); ok {
g.AddEdge(in, node, BuildInputGraphEdgeKind)
}
from := buildutil.GetImageStreamForStrategy(config.Parameters.Strategy)
if from != nil {
switch from.Kind {
case "DockerImage":
if ref, err := image.ParseDockerImageReference(from.Name); err == nil {
tag := ref.Tag
ref.Tag = ""
in := DockerRepository(g, ref.String(), tag)
g.AddEdge(in, node, BuildInputImageGraphEdgeKind)
}
case "ImageStream":
tag := image.DefaultImageTag
in := ImageStreamTag(g, defaultNamespace(from.Namespace, config.Namespace), from.Name, tag)
g.AddEdge(in, node, BuildInputImageGraphEdgeKind)
case "ImageStreamTag":
name, tag, _ := image.SplitImageStreamTag(from.Name)
in := ImageStreamTag(g, defaultNamespace(from.Namespace, config.Namespace), name, tag)
g.AddEdge(in, node, BuildInputImageGraphEdgeKind)
case "ImageStreamImage":
glog.V(4).Infof("Ignoring ImageStreamImage reference in BuildConfig %s/%s", config.Namespace, config.Name)
}
}
return node
}
// getStreams iterates over a given set of build configurations
// and extracts all the image streams which trigger a
// build when the image stream is updated
func getStreams(configs []buildapi.BuildConfig) map[string][]string {
glog.V(1).Infof("Scanning BuildConfigs")
avoidDuplicates := make(map[string][]string)
for _, cfg := range configs {
glog.V(1).Infof("Scanning BuildConfigs %v", cfg)
for _, tr := range cfg.Triggers {
glog.V(1).Infof("Scanning trigger %v", tr)
from := buildutil.GetImageStreamForStrategy(cfg.Parameters.Strategy)
glog.V(1).Infof("Strategy from= %v", from)
if tr.ImageChange != nil && from != nil && from.Name != "" {
glog.V(1).Infof("found ICT with from %s kind %s", from.Name, from.Kind)
var name, tag string
switch from.Kind {
case "ImageStreamTag":
bits := strings.Split(from.Name, ":")
name = bits[0]
tag = bits[1]
default:
// ImageStreamImage and DockerImage are never updated and so never
// trigger builds.
continue
}
var stream string
switch from.Namespace {
case "":
stream = join(cfg.Namespace, name)
default:
stream = join(from.Namespace, name)
}
uniqueTag := true
for _, prev := range avoidDuplicates[stream] {
if prev == tag {
uniqueTag = false
break
}
}
glog.V(1).Infof("checking unique tag %v %s", uniqueTag, tag)
if uniqueTag {
avoidDuplicates[stream] = append(avoidDuplicates[stream], tag)
}
}
}
}
return avoidDuplicates
}
// findStreamDeps accepts an image stream and a list of build
// configurations and returns the dependency tree of the specified
// image stream
func findStreamDeps(stream, tag string, buildConfigList []buildapi.BuildConfig) (*Node, error) {
root := &Node{
FullName: stream,
Tags: []string{tag},
}
namespace, name, err := split(stream)
if err != nil {
return nil, err
}
// Search all build configurations in order to find the image
// streams depending on the specified image stream
var childNamespace, childName, childTag string
for _, cfg := range buildConfigList {
for _, tr := range cfg.Triggers {
from := buildutil.GetImageStreamForStrategy(cfg.Parameters.Strategy)
if from == nil || from.Kind != "ImageStreamTag" || tr.ImageChange == nil {
continue
}
// Setup zeroed fields to their default values
if from.Namespace == "" {
from.Namespace = cfg.Namespace
}
fromTag := strings.Split(from.Name, ":")[1]
parentStream := namespace + "/" + name + ":" + tag
if buildutil.NameFromImageStream("", from, fromTag) == parentStream {
// Either To & Tag or DockerImageReference will be used as output
if cfg.Parameters.Output.To != nil && cfg.Parameters.Output.To.Name != "" {
childName = cfg.Parameters.Output.To.Name
childTag = cfg.Parameters.Output.Tag
if cfg.Parameters.Output.To.Namespace != "" {
childNamespace = cfg.Parameters.Output.To.Namespace
} else {
childNamespace = cfg.Namespace
}
} else {
ref, err := imageapi.ParseDockerImageReference(cfg.Parameters.Output.DockerImageReference)
if err != nil {
return nil, err
}
childName = ref.Name
childTag = ref.Tag
childNamespace = cfg.Namespace
}
childStream := join(childNamespace, childName)
// Build all children and their dependency trees recursively
child, err := findStreamDeps(childStream, childTag, buildConfigList)
if err != nil {
return nil, err
}
// Add edge between root and child
cfgFullName := join(cfg.Namespace, cfg.Name)
root.Edges = append(root.Edges, NewEdge(cfgFullName, child.FullName))
// If the child depends on root via more than one tag, we have to make sure
// that only one single instance of the child will make it into root.Children
cont := false
for _, stream := range root.Children {
if stream.FullName == child.FullName {
// Just pass the tag along and discard the current child
stream.Tags = append(stream.Tags, child.Tags...)
cont = true
break
}
}
if cont {
// Do not append this child in root.Children. It's already in there
continue
}
root.Children = append(root.Children, child)
}
}
}
return root, nil
}
// HandleImageRepo processes the next ImageStream event.
func (c *ImageChangeController) HandleImageRepo(repo *imageapi.ImageStream) error {
glog.V(4).Infof("Build image change controller detected ImageStream change %s", repo.Status.DockerImageRepository)
// Loop through all build configurations and record if there was an error
// instead of breaking the loop. The error will be returned in the end, so the
// retry controller can retry. Any BuildConfigs that were processed successfully
// should have had their LastTriggeredImageID updated, so the retry should result
// in a no-op for them.
hasError := false
// TODO: this is inefficient
for _, bc := range c.BuildConfigStore.List() {
config := bc.(*buildapi.BuildConfig)
from := buildutil.GetImageStreamForStrategy(config.Parameters.Strategy)
if from == nil || from.Kind != "ImageStreamTag" {
continue
}
shouldBuild := false
triggeredImage := ""
// For every ImageChange trigger find the latest tagged image from the image repository and replace that value
// throughout the build strategies. A new build is triggered only if the latest tagged image id or pull spec
// differs from the last triggered build recorded on the build config.
for _, trigger := range config.Triggers {
if trigger.Type != buildapi.ImageChangeBuildTriggerType {
continue
}
fromStreamName := getImageStreamNameFromReference(from)
fromNamespace := from.Namespace
if len(fromNamespace) == 0 {
fromNamespace = config.Namespace
}
// only trigger a build if this image repo matches the name and namespace of the ref in the build trigger
// also do not trigger if the imagerepo does not have a valid DockerImageRepository value for us to pull
// the image from
if len(repo.Status.DockerImageRepository) == 0 || fromStreamName != repo.Name || fromNamespace != repo.Namespace {
continue
}
// This split is safe because ImageStreamTag names always have the form
// name:tag.
tag := strings.Split(from.Name, ":")[1]
latest := imageapi.LatestTaggedImage(repo, tag)
if latest == nil {
glog.V(4).Infof("unable to find tagged image: no image recorded for %s/%s:%s", repo.Namespace, repo.Name, tag)
continue
}
glog.V(4).Infof("Found ImageStream %s/%s with tag %s", repo.Namespace, repo.Name, tag)
// (must be different) to trigger a build
last := trigger.ImageChange.LastTriggeredImageID
next := latest.DockerImageReference
if len(last) == 0 || (len(next) > 0 && next != last) {
triggeredImage = next
shouldBuild = true
// it doesn't really make sense to have multiple image change triggers any more,
// so just exit the loop now
break
}
}
if shouldBuild {
glog.V(4).Infof("Running build for BuildConfig %s/%s", config.Namespace, config.Name)
// instantiate new build
request := &buildapi.BuildRequest{
ObjectMeta: kapi.ObjectMeta{
Name: config.Name,
Namespace: config.Namespace,
},
TriggeredByImage: &kapi.ObjectReference{
Kind: "DockerImage",
Name: triggeredImage,
},
}
if _, err := c.BuildConfigInstantiator.Instantiate(config.Namespace, request); err != nil {
if kerrors.IsConflict(err) {
util.HandleError(fmt.Errorf("unable to instantiate Build for BuildConfig %s/%s due to a conflicting update: %v", config.Namespace, config.Name, err))
} else {
util.HandleError(fmt.Errorf("error instantiating Build from BuildConfig %s/%s: %v", config.Namespace, config.Name, err))
}
hasError = true
continue
}
}
}
if hasError {
return fmt.Errorf("an error occurred processing 1 or more build configurations; the image change trigger for image stream %s will be retried", repo.Status.DockerImageRepository)
}
return nil
}
