mirror of https://gitee.com/extrame/dget.git
410 lines
13 KiB
Go
410 lines
13 KiB
Go
package dget
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import (
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"archive/tar"
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"bytes"
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"compress/gzip"
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"crypto/sha256"
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"encoding/hex"
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"encoding/json"
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"errors"
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"fmt"
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"io"
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"io/ioutil"
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"net/http"
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"os"
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"path/filepath"
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"strings"
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"time"
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"github.com/docker/distribution/manifest/manifestlist"
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"github.com/opencontainers/go-digest"
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"github.com/sirupsen/logrus"
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)
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const _registry = "registry-1.docker.io"
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const _authUrl = "https://auth.docker.io/token"
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const _regService = "registry.docker.io"
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type LayerInfo struct {
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Id string `json:"id"`
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Parent string `json:"parent"`
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Created time.Time `json:"created"`
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ContainerConfig struct {
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Hostname string
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Domainname string
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User string
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AttachStdin bool
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AttachStdout bool
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AttachStderr bool
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Tty bool
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OpenStdin bool
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StdinOnce bool
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Env []string
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CMd []string
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Image string
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Volumes map[string]interface{}
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WorkingDir string
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Entrypoint []string
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OnBuild []string
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Labels map[string]interface{}
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} `json:"container_config"`
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}
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type Layer struct {
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Digest string
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Urls []string
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}
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type Info struct {
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Layers []Layer `json:"layers"`
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Config struct {
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Digest digest.Digest `json:"digest,omitempty"`
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} `json:"config"`
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}
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type PackageConfig struct {
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Config string
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RepoTags []string
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Layers []string
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}
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func Install(d, tag string, arch string, printInfo bool) (err error) {
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var authUrl = _authUrl
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var regService = _regService
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resp, err := http.Get(fmt.Sprintf("https://%s/v2/", _registry))
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if err == nil {
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if !strings.Contains(d, "/") {
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d = "library/" + d
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}
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if resp.StatusCode == 401 {
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//Bearer realm="https://auth.docker.io/token",service="registry.docker.io"
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var hAuths = strings.Split(resp.Header.Get("Www-Authenticate"), "\"")
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if len(hAuths) > 1 {
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authUrl = hAuths[1]
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}
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if len(hAuths) > 3 {
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regService = hAuths[3]
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} else {
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regService = ""
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}
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}
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resp.Body.Close()
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var accessToken string
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logrus.Debugln("reg_service", regService)
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accessToken, err = getAuthHead("application/vnd.docker.distribution.manifest.v2+json", authUrl, regService, d)
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if err == nil {
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var req *http.Request
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var url = fmt.Sprintf("https://%s/v2/%s/manifests/%s", _registry, d, tag)
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req, err = http.NewRequest("GET", url, nil)
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logrus.Infoln("获取manifests信息", url)
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if err == nil {
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logrus.Debugln("Authorization by", accessToken)
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req.Header.Add("Authorization", "Bearer "+accessToken)
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req.Header.Add("Accept", "application/vnd.docker.distribution.manifest.list.v2+json")
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var authHeader = req.Header
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resp, err = http.DefaultClient.Do(req)
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if resp.StatusCode != 200 {
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bts, er := ioutil.ReadAll(resp.Body)
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resp.Body.Close()
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logrus.Debugln(string(bts), er)
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switch resp.StatusCode {
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case 401:
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logrus.Errorf("[-] Cannot fetch manifest for %s [HTTP %d] with error access_token", d, resp.StatusCode)
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case 404:
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logrus.Errorf("[-] Cannot fetch manifest for %s [HTTP %d] with url %s", d, resp.StatusCode, url)
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resp.Body.Close()
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req.Header.Set("Accept", "application/vnd.docker.distribution.manifest.list.v2+json")
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resp, err = http.DefaultClient.Do(req)
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bts, er := ioutil.ReadAll(resp.Body)
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fmt.Println(string(bts), er)
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}
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//TODO
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os.Exit(1)
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} else {
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var info manifestlist.ManifestList
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var bts []byte
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bts, err = io.ReadAll(resp.Body)
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if err == nil {
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err = json.Unmarshal(bts, &info)
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if err == nil {
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resp.Body.Close()
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logrus.Infof("获得%d个架构信息:", len(info.Manifests))
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var selectedManifest *manifestlist.ManifestDescriptor
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for i := 0; i < len(info.Manifests); i++ {
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var m = info.Manifests[i]
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logrus.Infof("[%d]架构:%s,OS:%s", i+1, m.Platform.Architecture, m.Platform.OS)
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if m.Platform.OS+"/"+m.Platform.Architecture == arch {
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logrus.Infoln("找到匹配的架构,开始下载")
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selectedManifest = &m
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}
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}
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if printInfo {
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fmt.Println(string(bts))
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os.Exit(0)
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}
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if selectedManifest == nil {
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return errors.New("未找到匹配的架构:" + arch)
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}
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req.Header.Set("Accept", selectedManifest.MediaType)
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resp, err = http.DefaultClient.Do(req)
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var info Info
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err = json.NewDecoder(resp.Body).Decode(&info)
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if err == nil {
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resp.Body.Close()
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logrus.Infof("获得Manifest信息，共%d层需要下载", len(info.Layers))
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var tmpDir = fmt.Sprintf("tmp_%s_%s", d, tag)
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err = os.MkdirAll(tmpDir, 0777)
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if err == nil {
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if _, e := os.Stat(filepath.Join(tmpDir, "repositories")); e == nil {
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logrus.Info(tmpDir, "is downloaded,use dir as cache")
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} else {
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req, err = http.NewRequest("GET", fmt.Sprintf("https://%s/v2/%s/blobs/%s", _registry, d, info.Config.Digest), nil)
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if err == nil {
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req.Header = authHeader
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resp, err = http.DefaultClient.Do(req)
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if err == nil {
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var dest *os.File
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dest, err = os.OpenFile(filepath.Join(tmpDir, info.Config.Digest.Encoded()+".json"), os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0666)
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if err == nil {
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var bts []byte
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bts, err = ioutil.ReadAll(resp.Body)
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var lastLayerInfo LayerInfo
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err = json.Unmarshal(bts, &lastLayerInfo)
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resp.Body.Close()
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var config []PackageConfig
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config = append(config, PackageConfig{
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Config: info.Config.Digest.Encoded() + ".json",
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RepoTags: []string{d + ":" + tag},
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})
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if err == nil {
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_, err = io.Copy(dest, bytes.NewReader(bts))
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dest.Close()
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if err == nil {
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parentid := ""
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var fakeLayerId string
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for n, layer := range info.Layers {
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namer := sha256.New()
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namer.Write([]byte(parentid + "\n" + layer.Digest + "\n"))
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fakeLayerId = hex.EncodeToString(namer.Sum(nil))
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logrus.Infoln("handle layer", n, fakeLayerId, layer.Urls)
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layerDirName := filepath.Join(tmpDir, fakeLayerId)
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err = os.Mkdir(layerDirName, 0777)
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if _, er := os.Stat(filepath.Join(layerDirName, "layer.tar")); er == nil {
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logrus.Infoln("layer", fakeLayerId, "is existed, continue")
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config[0].Layers = append(config[0].Layers, fakeLayerId+"/layer.tar")
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parentid = fakeLayerId
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continue
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}
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if err == nil || os.IsExist(err) {
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err = ioutil.WriteFile(filepath.Join(layerDirName, "VERSION"), []byte("1.0"), 0666)
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if err == nil {
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req, err = http.NewRequest("GET", fmt.Sprintf("https://%s/v2/%s/blobs/%s", _registry, d, layer.Digest), nil)
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if err == nil {
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req.Header = authHeader
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req.Header.Set("Accept", "application/vnd.docker.distribution.manifest.v2+json")
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resp, err = http.DefaultClient.Do(req)
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if err == nil {
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if resp.StatusCode != 200 {
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defer resp.Body.Close()
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if len(layer.Urls) > 0 {
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req, err = http.NewRequest("GET", layer.Urls[0], nil)
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if err == nil {
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req.Header = authHeader
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req.Header.Set("Accept", "application/vnd.docker.distribution.manifest.v2+json")
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resp, err = http.DefaultClient.Do(req)
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if err == nil {
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if resp.StatusCode != 200 {
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err = fmt.Errorf("download from customized url fail for layer[%d]", n)
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goto response
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}
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}
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}
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} else {
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bts, _ := ioutil.ReadAll(resp.Body)
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logrus.Fatalln("下载失败", string(bts))
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}
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}
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}
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if err != nil {
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logrus.Errorf("请求第%d/%d层失败:%v", n+1, len(info.Layers), err)
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} else {
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logrus.Infof("请求第%d/%d层成功", n+1, len(info.Layers))
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}
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var dst *os.File
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dst, err = os.OpenFile(filepath.Join(layerDirName, "layer.tar.part"), os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0666)
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if err == nil {
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var greader *gzip.Reader
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greader, err = gzip.NewReader(resp.Body)
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if err == nil {
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_, err = io.Copy(dst, greader)
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if err == nil {
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dst.Close()
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var layerInfo LayerInfo
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if n == len(info.Layers)-1 {
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layerInfo = lastLayerInfo
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}
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layerInfo.Id = fakeLayerId
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if parentid != "" {
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layerInfo.Parent = parentid
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}
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parentid = fakeLayerId
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var jsonFile *os.File
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jsonFile, err = os.OpenFile(filepath.Join(layerDirName, "json"), os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0666)
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if err == nil {
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err = json.NewEncoder(jsonFile).Encode(&layerInfo)
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if err == nil {
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jsonFile.Close()
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err = os.Rename(filepath.Join(layerDirName, "layer.tar.part"), filepath.Join(layerDirName, "layer.tar"))
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}
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}
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}
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}
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}
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if err != nil {
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logrus.Errorf("保存第%d/%d层失败,%v", n+1, len(info.Layers), err)
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} else {
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logrus.Infof("保存第%d/%d层成功", n+1, len(info.Layers))
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}
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if err != nil {
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goto response
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} else {
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config[0].Layers = append(config[0].Layers, fakeLayerId+"/layer.tar")
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}
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}
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}
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}
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}
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var manifest *os.File
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manifest, err = os.OpenFile(filepath.Join(tmpDir, "manifest.json"), os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0666)
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if err == nil {
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err = json.NewEncoder(manifest).Encode(&config)
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if err == nil {
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manifest.Close()
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var repositories = make(map[string]interface{})
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repositories[d] = map[string]string{
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tag: fakeLayerId,
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}
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var rFile *os.File
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rFile, err = os.OpenFile(filepath.Join(tmpDir, "repositories"), os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0666)
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if err == nil {
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err = json.NewEncoder(rFile).Encode(&repositories)
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goto maketar
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}
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}
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}
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}
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}
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}
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}
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}
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}
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maketar:
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if err == nil {
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err = writeDirToTarGz(tmpDir, tmpDir+"-img.tar.gz")
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if err == nil {
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fmt.Println("write tar success", tmpDir+"-img.tar.gz")
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}
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}
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}
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}
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}
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}
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}
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}
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}
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}
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response:
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return
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}
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func getAuthHead(u, a, r, d string) (string, error) {
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resp, err := http.Get(fmt.Sprintf("%s?service=%s&scope=repository:%s:pull", a, r, d))
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defer resp.Body.Close()
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if err == nil {
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var results map[string]interface{}
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err = json.NewDecoder(resp.Body).Decode(&results)
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logrus.Debug(results)
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if err == nil {
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return results["access_token"].(string), nil
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}
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}
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return "", err
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}
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func writeDirToTarGz(sourcedir, destinationfile string) error {
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// create tar file
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gzFile, err := os.Create(destinationfile)
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gf := gzip.NewWriter(gzFile)
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tw := tar.NewWriter(gf)
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if err == nil {
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defer func() {
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tw.Close()
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gf.Close()
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gzFile.Close()
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}()
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// get list of files
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return filepath.Walk(sourcedir, func(path string, info os.FileInfo, err error) error {
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if err != nil {
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return err
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}
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relPath, err := filepath.Rel(sourcedir, path)
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if err == nil && relPath != "." {
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header, err := tar.FileInfoHeader(info, path)
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if err != nil {
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return err
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}
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// must provide real name
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// (see https://golang.org/src/archive/tar/common.go?#L626)
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header.Name = filepath.ToSlash(relPath)
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// write header
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if err := tw.WriteHeader(header); err != nil {
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return err
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}
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// if not a dir, write file content
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if !info.IsDir() {
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data, err := os.Open(path)
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if err != nil {
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return err
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}
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if _, err := io.Copy(tw, data); err != nil {
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return err
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}
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}
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return nil
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}
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return err
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})
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}
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return err
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}
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func SetLogLevel(lvl logrus.Level) {
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logrus.SetLevel(lvl)
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logrus.Debugln("设置日志级别为", lvl)
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}
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