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package trust
import (
"fmt"
"io/ioutil"
"os"
"path/filepath"
"strings"
"github.com/containers/image/v5/types"
"github.com/docker/docker/pkg/homedir"
"github.com/ghodss/yaml"
)
// registryConfiguration is one of the files in registriesDirPath configuring lookaside locations, or the result of merging them all.
// NOTE: Keep this in sync with docs/registries.d.md!
type registryConfiguration struct {
DefaultDocker *registryNamespace `json:"default-docker"`
// The key is a namespace, using fully-expanded Docker reference format or parent namespaces (per dockerReference.PolicyConfiguration*),
Docker map[string]registryNamespace `json:"docker"`
}
// registryNamespace defines lookaside locations for a single namespace.
type registryNamespace struct {
Lookaside string `json:"lookaside"` // For reading, and if LookasideStaging is not present, for writing.
LookasideStaging string `json:"lookaside-staging"` // For writing only.
SigStore string `json:"sigstore"` // For reading, and if SigStoreStaging is not present, for writing.
SigStoreStaging string `json:"sigstore-staging"` // For writing only.
}
// systemRegistriesDirPath is the path to registries.d.
const systemRegistriesDirPath = "/etc/containers/registries.d"
// userRegistriesDir is the path to the per user registries.d.
var userRegistriesDir = filepath.FromSlash(".config/containers/registries.d")
// RegistriesDirPath returns a path to registries.d
func RegistriesDirPath(sys *types.SystemContext) string {
if sys != nil && sys.RegistriesDirPath != "" {
return sys.RegistriesDirPath
}
userRegistriesDirPath := filepath.Join(homedir.Get(), userRegistriesDir)
if _, err := os.Stat(userRegistriesDirPath); err == nil {
return userRegistriesDirPath
}
if sys != nil && sys.RootForImplicitAbsolutePaths != "" {
return filepath.Join(sys.RootForImplicitAbsolutePaths, systemRegistriesDirPath)
}
return systemRegistriesDirPath
}
// loadAndMergeConfig loads registries.d configuration files in dirPath
func loadAndMergeConfig(dirPath string) (*registryConfiguration, error) {
mergedConfig := registryConfiguration{Docker: map[string]registryNamespace{}}
dockerDefaultMergedFrom := ""
nsMergedFrom := map[string]string{}
dir, err := os.Open(dirPath)
if err != nil {
if os.IsNotExist(err) {
return &mergedConfig, nil
}
return nil, err
}
configNames, err := dir.Readdirnames(0)
if err != nil {
return nil, err
}
for _, configName := range configNames {
if !strings.HasSuffix(configName, ".yaml") {
continue
}
configPath := filepath.Join(dirPath, configName)
configBytes, err := ioutil.ReadFile(configPath)
if err != nil {
return nil, err
}
var config registryConfiguration
err = yaml.Unmarshal(configBytes, &config)
if err != nil {
return nil, fmt.Errorf("parsing %s: %w", configPath, err)
}
if config.DefaultDocker != nil {
if mergedConfig.DefaultDocker != nil {
return nil, fmt.Errorf(`error parsing signature storage configuration: "default-docker" defined both in "%s" and "%s"`,
dockerDefaultMergedFrom, configPath)
}
mergedConfig.DefaultDocker = config.DefaultDocker
dockerDefaultMergedFrom = configPath
}
for nsName, nsConfig := range config.Docker { // includes config.Docker == nil
if _, ok := mergedConfig.Docker[nsName]; ok {
return nil, fmt.Errorf(`error parsing signature storage configuration: "docker" namespace "%s" defined both in "%s" and "%s"`,
nsName, nsMergedFrom[nsName], configPath)
}
mergedConfig.Docker[nsName] = nsConfig
nsMergedFrom[nsName] = configPath
}
}
return &mergedConfig, nil
}
// registriesDConfigurationForScope returns registries.d configuration for the provided scope.
// scope can be "" to return only the global default configuration entry.
func registriesDConfigurationForScope(registryConfigs *registryConfiguration, scope string) *registryNamespace {
searchScope := scope
if searchScope != "" {
if !strings.Contains(searchScope, "/") {
val, exists := registryConfigs.Docker[searchScope]
if exists {
return &val
}
}
for range strings.Split(scope, "/") {
val, exists := registryConfigs.Docker[searchScope]
if exists {
return &val
}
if strings.Contains(searchScope, "/") {
searchScope = searchScope[:strings.LastIndex(searchScope, "/")]
}
}
}
return registryConfigs.DefaultDocker
}
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