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feat: replace Skopeo with Crane (#5692)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,189 @@ | ||
| package imageinspector | ||
|
|
||
| import ( | ||
| "context" | ||
| "encoding/base64" | ||
| "encoding/json" | ||
| "fmt" | ||
| "regexp" | ||
| "strconv" | ||
| "strings" | ||
| "time" | ||
|
|
||
| "github.com/google/go-containerregistry/pkg/authn" | ||
| "github.com/google/go-containerregistry/pkg/crane" | ||
| corev1 "k8s.io/api/core/v1" | ||
|
|
||
| "github.com/kubeshop/testkube/pkg/utils" | ||
| ) | ||
|
|
||
| type craneFetcher struct { | ||
| } | ||
|
|
||
| func NewCraneFetcher() InfoFetcher { | ||
| return &craneFetcher{} | ||
| } | ||
|
|
||
| func (c *craneFetcher) Fetch(ctx context.Context, registry, image string, pullSecrets []corev1.Secret) (*Info, error) { | ||
| // If registry is not provided, extract it from the image name | ||
| if registry == "" { | ||
| registry = extractRegistry(image) | ||
| } | ||
|
|
||
| // If registry is provided via config and the image does not start with the registry, prepend it | ||
| if registry != "" && registry != utils.DefaultDockerRegistry && !strings.HasPrefix(image, registry+"/") { | ||
| image = registry + "/" + image | ||
| } | ||
|
|
||
| // Support pull secrets | ||
| authConfigs, err := ParseSecretData(pullSecrets, registry) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| // Select the auth | ||
| craneOptions := []crane.Option{crane.WithContext(ctx)} | ||
| if len(authConfigs) > 0 { | ||
| craneOptions = append(craneOptions, crane.WithAuth(authn.FromConfig(authConfigs[0]))) | ||
| } | ||
|
|
||
| // Fetch the image configuration | ||
| fetchedAt := time.Now() | ||
| serializedImageConfig, err := crane.Config(image, craneOptions...) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| var imageConfig DockerImage | ||
| if err = json.Unmarshal(serializedImageConfig, &imageConfig); err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| // Build the required image information | ||
| user, group := determineUserGroupPair(imageConfig.Config.User) | ||
| result := &Info{ | ||
| FetchedAt: fetchedAt, | ||
| Entrypoint: imageConfig.Config.Entrypoint, | ||
| Cmd: imageConfig.Config.Cmd, | ||
| WorkingDir: imageConfig.Config.WorkingDir, | ||
| User: user, | ||
| Group: group, | ||
| } | ||
|
|
||
| // Try to detect optional shell information | ||
| for i := len(imageConfig.History); i > 0; i-- { | ||
| command := imageConfig.History[i-1].CreatedBy | ||
| re, err := regexp.Compile(`/bin/([a-z]*)sh`) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| result.Shell = re.FindString(command) | ||
| if result.Shell != "" { | ||
| break | ||
| } | ||
| } | ||
|
|
||
| return result, nil | ||
| } | ||
|
|
||
| // DockerImage contains definition of docker image | ||
| type DockerImage struct { | ||
| Config struct { | ||
| User string `json:"User"` | ||
| Entrypoint []string `json:"Entrypoint"` | ||
| Cmd []string `json:"Cmd"` | ||
| WorkingDir string `json:"WorkingDir"` | ||
| } `json:"config"` | ||
| History []struct { | ||
| Created time.Time `json:"created"` | ||
| CreatedBy string `json:"created_by"` | ||
| } `json:"history"` | ||
| } | ||
|
|
||
| // extractRegistry takes a container image string and returns the registry part. | ||
| // It defaults to "docker.io" if no registry is specified. | ||
| func extractRegistry(image string) string { | ||
| parts := strings.Split(image, "/") | ||
| // If the image is just a name, return the default registry. | ||
| if len(parts) == 1 { | ||
| return utils.DefaultDockerRegistry | ||
| } | ||
| // If the first part contains '.' or ':', it's likely a registry. | ||
| if strings.Contains(parts[0], ".") || strings.Contains(parts[0], ":") { | ||
| return parts[0] | ||
| } | ||
| return utils.DefaultDockerRegistry | ||
| } | ||
|
|
||
| func determineUserGroupPair(userGroupStr string) (int64, int64) { | ||
| if userGroupStr == "" { | ||
| userGroupStr = "0" | ||
| } | ||
| userStr, groupStr, _ := strings.Cut(userGroupStr, ":") | ||
| if groupStr == "" { | ||
| groupStr = "0" | ||
| } | ||
| user, _ := strconv.Atoi(userStr) | ||
| group, _ := strconv.Atoi(groupStr) | ||
| return int64(user), int64(group) | ||
| } | ||
|
|
||
| // DockerAuths contains an embedded DockerAuthConfigs | ||
| type DockerAuths struct { | ||
| Auths map[string]authn.AuthConfig `json:"auths"` | ||
| } | ||
|
|
||
| // ParseSecretData parses secret data for docker auth config | ||
| func ParseSecretData(imageSecrets []corev1.Secret, registry string) ([]authn.AuthConfig, error) { | ||
| var results []authn.AuthConfig | ||
| for _, imageSecret := range imageSecrets { | ||
| auths := DockerAuths{} | ||
| if jsonData, ok := imageSecret.Data[".dockerconfigjson"]; ok { | ||
| if err := json.Unmarshal(jsonData, &auths); err != nil { | ||
| return nil, err | ||
| } | ||
| } else if configData, ok := imageSecret.Data[".dockercfg"]; ok { | ||
| if err := json.Unmarshal(configData, &auths.Auths); err != nil { | ||
| return nil, err | ||
| } | ||
| } else { | ||
| return nil, fmt.Errorf("imagePullSecret %s contains neither .dockercfg nor .dockerconfigjson", imageSecret.Name) | ||
| } | ||
|
|
||
| // Determine if there is a secret for the specified registry | ||
| if creds, ok := auths.Auths[registry]; ok { | ||
| username, password, err := extractRegistryCredentials(creds) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| results = append(results, authn.AuthConfig{Username: username, Password: password}) | ||
| } | ||
| } | ||
|
|
||
| return results, nil | ||
| } | ||
|
|
||
| func extractRegistryCredentials(creds authn.AuthConfig) (username, password string, err error) { | ||
| if creds.Auth == "" { | ||
| return creds.Username, creds.Password, nil | ||
| } | ||
|
|
||
| decoder := base64.StdEncoding | ||
| if !strings.HasSuffix(strings.TrimSpace(creds.Auth), "=") { | ||
| // Modify the decoder to be raw if no padding is present | ||
| decoder = decoder.WithPadding(base64.NoPadding) | ||
| } | ||
|
|
||
| base64Decoded, err := decoder.DecodeString(creds.Auth) | ||
| if err != nil { | ||
| return "", "", err | ||
| } | ||
|
|
||
| splitted := strings.SplitN(string(base64Decoded), ":", 2) | ||
| if len(splitted) != 2 { | ||
| return creds.Username, creds.Password, nil | ||
| } | ||
|
|
||
| return splitted[0], splitted[1], nil | ||
| } |
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