forked from kubernetes-sigs/kustomize
/
setimage.go
201 lines (167 loc) · 4.53 KB
/
setimage.go
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/*
Copyright 2019 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package set
import (
"errors"
"regexp"
"sort"
"strings"
"github.com/spf13/cobra"
"sigs.k8s.io/kustomize/pkg/commands/kustfile"
"sigs.k8s.io/kustomize/pkg/fs"
"sigs.k8s.io/kustomize/pkg/image"
)
type setImageOptions struct {
imageMap map[string]image.Image
}
var pattern = regexp.MustCompile("^(.*):([a-zA-Z0-9._-]*)$")
// errors
var (
errImageNoArgs = errors.New("no image specified")
errImageInvalidArgs = errors.New(`invalid format of image, use one of the following options:
- <image>=<newimage>:<newtag>
- <image>=<newimage>@<newtag>
- <image>=<newimage>
- <image>:<newtag>
- <image>@<digest>`)
)
const separator = "="
// newCmdSetImage sets the new names, tags or digests for images in the kustomization.
func newCmdSetImage(fsys fs.FileSystem) *cobra.Command {
var o setImageOptions
cmd := &cobra.Command{
Use: "image",
Short: `Sets images and their new names, new tags or digests in the kustomization file`,
Example: `
The command
set image postgres=eu.gcr.io/my-project/postgres:latest my-app=my-registry/my-app@sha256:24a0c4b4a4c0eb97a1aabb8e29f18e917d05abfe1b7a7c07857230879ce7d3d3
will add
image:
- name: postgres
newName: eu.gcr.io/my-project/postgres
newTag: latest
- digest: sha256:24a0c4b4a4c0eb97a1aabb8e29f18e917d05abfe1b7a7c07857230879ce7d3d3
name: my-app
newName: my-registry/my-app
to the kustomization file if it doesn't exist,
and overwrite the previous ones if the image name exists.
The command
set image node:8.15.0 mysql=mariadb alpine@sha256:24a0c4b4a4c0eb97a1aabb8e29f18e917d05abfe1b7a7c07857230879ce7d3d3
will add
image:
- name: node
newTag: 8.15.0
- name: mysql
newName: mariadb
- digest: sha256:24a0c4b4a4c0eb97a1aabb8e29f18e917d05abfe1b7a7c07857230879ce7d3d3
name: alpine
to the kustomization file if it doesn't exist,
and overwrite the previous ones if the image name exists.
`,
RunE: func(cmd *cobra.Command, args []string) error {
err := o.Validate(args)
if err != nil {
return err
}
return o.RunSetImage(fsys)
},
}
return cmd
}
type overwrite struct {
name string
digest string
tag string
}
// Validate validates setImage command.
func (o *setImageOptions) Validate(args []string) error {
if len(args) == 0 {
return errImageNoArgs
}
o.imageMap = make(map[string]image.Image)
for _, arg := range args {
img, err := parse(arg)
if err != nil {
return err
}
o.imageMap[img.Name] = img
}
return nil
}
// RunSetImage runs setImage command.
func (o *setImageOptions) RunSetImage(fSys fs.FileSystem) error {
mf, err := kustfile.NewKustomizationFile(fSys)
if err != nil {
return err
}
m, err := mf.Read()
if err != nil {
return err
}
// append only new images from ksutomize file
for _, im := range m.Images {
if _, ok := o.imageMap[im.Name]; ok {
continue
}
o.imageMap[im.Name] = im
}
var images []image.Image
for _, v := range o.imageMap {
images = append(images, v)
}
sort.Slice(images, func(i, j int) bool {
return images[i].Name < images[j].Name
})
m.Images = images
return mf.Write(m)
}
func parse(arg string) (image.Image, error) {
// matches if there is an image name to overwrite
// <image>=<new-image><:|@><new-tag>
if s := strings.Split(arg, separator); len(s) == 2 {
p, err := parseOverwrite(s[1])
return image.Image{
Name: s[0],
NewName: p.name,
NewTag: p.tag,
Digest: p.digest,
}, err
}
// matches only for <tag|digest> overwrites
// <image><:|@><new-tag>
p, err := parseOverwrite(arg)
return image.Image{
Name: p.name,
NewTag: p.tag,
Digest: p.digest,
}, err
}
// parseOverwrite parses the overwrite parameters
// from the given arg into a struct
func parseOverwrite(arg string) (overwrite, error) {
// match <image>@<digest>
if d := strings.Split(arg, "@"); len(d) > 1 {
return overwrite{
name: d[0],
digest: d[1],
}, nil
}
// match <image>:<tag>
if t := pattern.FindStringSubmatch(arg); len(t) == 3 {
return overwrite{
name: t[1],
tag: t[2],
}, nil
}
return overwrite{}, errImageInvalidArgs
}