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draje.go
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draje.go
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package main
import (
"encoding/base64"
"encoding/json"
"fmt"
"github.com/urfave/cli"
"io/ioutil"
"net/http"
"os"
"strings"
)
type TagResponse struct {
Name string `json: "name"`
Tags []string `json: "tags"`
}
func basicAuth(username, password string) string {
auth := username + ":" + password
return base64.StdEncoding.EncodeToString([]byte(auth))
}
func getTagResponse(body []byte) (*TagResponse, error) {
s := new(TagResponse)
err := json.Unmarshal(body, &s)
if err != nil {
fmt.Println(err)
}
return s, err
}
func getTagListFromRegisty(host, image, token string) []string {
url := host + "/v2/" + image + "/tags/list"
req, _ := http.NewRequest("GET", url, nil)
req.Header.Add("Authorization", "Basic "+token)
res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, err := ioutil.ReadAll(res.Body)
if err != nil {
panic(err.Error())
}
s, _ := getTagResponse([]byte(body))
return s.Tags
}
func removeTagFromRegistry(host, image, token, tag string) {
url_tag := host + "/v2/" + image + "/manifests/" + tag
req_tag, _ := http.NewRequest("GET", url_tag, nil)
req_tag.Header.Add("Authorization", "Basic "+token)
req_tag.Header.Add("Accept", "application/vnd.docker.distribution.manifest.v2+json")
res_tag, _ := http.DefaultClient.Do(req_tag)
defer res_tag.Body.Close()
if res_tag.StatusCode != 200 {
fmt.Println("image: " + image + " tag: " + tag + " could not get content digest, failed!")
body, _ := ioutil.ReadAll(res_tag.Body)
fmt.Println(string(body))
return
}
digest := res_tag.Header.Get("Docker-Content-Digest")
url_remove := host + "/v2/" + image + "/manifests/" + digest
req_remove, _ := http.NewRequest("DELETE", url_remove, nil)
req_remove.Header.Add("Authorization", "Basic "+token)
req_remove.Header.Add("Accept", "application/vnd.docker.distribution.manifest.v2+json")
res_remove, _ := http.DefaultClient.Do(req_remove)
if res_remove.StatusCode != 202 {
fmt.Println("image: " + image + " tag: " + tag + " could not removed")
body, _ := ioutil.ReadAll(res_tag.Body)
fmt.Println(string(body))
return
}
fmt.Println("image: " + image + " tag: " + tag + " removed!")
defer res_remove.Body.Close()
}
func main() {
app := cli.NewApp()
app.Name = "draje - docker registry api from jenkins"
app.Description = "uses docker registy v2 api for deleting images from docker registry"
app.Version = "0.0.1"
app.Authors = []cli.Author{
cli.Author{
Name: "Ahmet Oz",
Email: "[email protected]",
},
}
app.Flags = []cli.Flag{
cli.StringFlag{
Name: "host",
Value: "",
Usage: "host address of docker registry",
},
cli.StringFlag{
Name: "image",
Value: "",
Usage: "name of the image",
},
cli.StringFlag{
Name: "excluded_tags",
Value: "latest",
Usage: "name of the image tag which will be excluded",
},
cli.StringFlag{
Name: "username",
Value: "",
Usage: "registry user name",
},
cli.StringFlag{
Name: "password",
Value: "",
Usage: "registry user password",
},
cli.IntFlag{
Name: "exclude_last",
Value: 1,
Usage: "exclude last n images",
},
}
app.Action = func(c *cli.Context) error {
if c.String("host") == "" {
return cli.NewExitError("host is required", 86)
}
if c.String("image") == "" {
return cli.NewExitError("image is required", 86)
}
if c.String("username") == "" {
return cli.NewExitError("user name is required", 86)
}
if c.String("password") == "" {
return cli.NewExitError("password is required", 86)
}
token := basicAuth(c.String("username"), c.String("password"))
host := c.String("host")
image := c.String("image")
tags := getTagListFromRegisty(host, image, token)
excluded_tags := strings.Split(c.String("excluded_tags"), ",")
included_tags := tags[:len(tags)-c.Int("exclude_last")]
for _, tag := range included_tags {
exclude := false
for _, excluded_tag := range excluded_tags {
if string(tag) == string(excluded_tag) {
exclude = true
break
}
}
if !exclude {
removeTagFromRegistry(host, image, token, tag)
}
}
fmt.Println("Completed.")
return nil
}
app.Run(os.Args)
}