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ImageTagTransformer.go
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ImageTagTransformer.go
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// Code generated by pluginator on ImageTagTransformer; DO NOT EDIT.
// pluginator {unknown 1970-01-01T00:00:00Z }
package builtins
import (
"fmt"
"regexp"
"strings"
"sigs.k8s.io/kustomize/api/filters/imagetag"
"sigs.k8s.io/kustomize/api/resmap"
"sigs.k8s.io/kustomize/api/types"
"sigs.k8s.io/kustomize/kyaml/filtersutil"
"sigs.k8s.io/yaml"
)
// Find matching image declarations and replace
// the name, tag and/or digest.
type ImageTagTransformerPlugin struct {
ImageTag types.Image `json:"imageTag,omitempty" yaml:"imageTag,omitempty"`
FieldSpecs []types.FieldSpec `json:"fieldSpecs,omitempty" yaml:"fieldSpecs,omitempty"`
}
func (p *ImageTagTransformerPlugin) Config(
_ *resmap.PluginHelpers, c []byte) (err error) {
p.ImageTag = types.Image{}
p.FieldSpecs = nil
return yaml.Unmarshal(c, p)
}
func (p *ImageTagTransformerPlugin) Transform(m resmap.ResMap) error {
for _, r := range m.Resources() {
// traverse all fields at first
err := filtersutil.ApplyToJSON(imagetag.LegacyFilter{
ImageTag: p.ImageTag,
}, r)
if err != nil {
return err
}
// then use user specified field specs
err = filtersutil.ApplyToJSON(imagetag.Filter{
ImageTag: p.ImageTag,
FsSlice: p.FieldSpecs,
}, r)
if err != nil {
return err
}
}
return nil
}
func (p *ImageTagTransformerPlugin) mutateImage(in interface{}) (interface{}, error) {
original, ok := in.(string)
if !ok {
return nil, fmt.Errorf("image path is not of type string but %T", in)
}
if !isImageMatched(original, p.ImageTag.Name) {
return original, nil
}
name, tag := split(original)
if p.ImageTag.NewName != "" {
name = p.ImageTag.NewName
}
if p.ImageTag.NewTag != "" {
tag = ":" + p.ImageTag.NewTag
}
if p.ImageTag.Digest != "" {
tag = "@" + p.ImageTag.Digest
}
return name + tag, nil
}
// findAndReplaceImage replaces the image name and
// tags inside one object.
// It searches the object for container session
// then loops though all images inside containers
// session, finds matched ones and update the
// image name and tag name
func (p *ImageTagTransformerPlugin) findAndReplaceImage(obj map[string]interface{}) error {
paths := []string{"containers", "initContainers"}
updated := false
for _, path := range paths {
containers, found := obj[path]
if found && containers != nil {
if _, err := p.updateContainers(containers); err != nil {
return err
}
updated = true
}
}
if !updated {
return p.findContainers(obj)
}
return nil
}
func (p *ImageTagTransformerPlugin) updateContainers(in interface{}) (interface{}, error) {
containers, ok := in.([]interface{})
if !ok {
return nil, fmt.Errorf(
"containers path is not of type []interface{} but %T", in)
}
for i := range containers {
container := containers[i].(map[string]interface{})
containerImage, found := container["image"]
if !found {
continue
}
imageName := containerImage.(string)
if isImageMatched(imageName, p.ImageTag.Name) {
newImage, err := p.mutateImage(imageName)
if err != nil {
return nil, err
}
container["image"] = newImage
}
}
return containers, nil
}
func (p *ImageTagTransformerPlugin) findContainers(obj map[string]interface{}) error {
for key := range obj {
switch typedV := obj[key].(type) {
case map[string]interface{}:
err := p.findAndReplaceImage(typedV)
if err != nil {
return err
}
case []interface{}:
for i := range typedV {
item := typedV[i]
typedItem, ok := item.(map[string]interface{})
if ok {
err := p.findAndReplaceImage(typedItem)
if err != nil {
return err
}
}
}
}
}
return nil
}
func isImageMatched(s, t string) bool {
// Tag values are limited to [a-zA-Z0-9_.{}-].
// Some tools like Bazel rules_k8s allow tag patterns with {} characters.
// More info: https://github.com/bazelbuild/rules_k8s/pull/423
pattern, _ := regexp.Compile("^" + t + "(@sha256)?(:[a-zA-Z0-9_.{}-]*)?$")
return pattern.MatchString(s)
}
// split separates and returns the name and tag parts
// from the image string using either colon `:` or at `@` separators.
// Note that the returned tag keeps its separator.
func split(imageName string) (name string, tag string) {
// check if image name contains a domain
// if domain is present, ignore domain and check for `:`
ic := -1
if slashIndex := strings.Index(imageName, "/"); slashIndex < 0 {
ic = strings.LastIndex(imageName, ":")
} else {
lastIc := strings.LastIndex(imageName[slashIndex:], ":")
// set ic only if `:` is present
if lastIc > 0 {
ic = slashIndex + lastIc
}
}
ia := strings.LastIndex(imageName, "@")
if ic < 0 && ia < 0 {
return imageName, ""
}
i := ic
if ia > 0 {
i = ia
}
name = imageName[:i]
tag = imageName[i:]
return
}
func NewImageTagTransformerPlugin() resmap.TransformerPlugin {
return &ImageTagTransformerPlugin{}
}