Merge pull request #841 from baude/kpod_pull_name

libkpod/image/copy.go: Add pull by short-name

vendor/github.com/containers/image/pkg/sysregistries/system_registries.go

@@ -0,0 +1,86 @@
+package sysregistries
+
+import (
+	"github.com/BurntSushi/toml"
+	"github.com/containers/image/types"
+	"io/ioutil"
+	"path/filepath"
+)
+
+// systemRegistriesConfPath is the path to the system-wide registry configuration file
+// and is used to add/subtract potential registries for obtaining images.
+// You can override this at build time with
+// -ldflags '-X github.com/containers/image/sysregistries.systemRegistriesConfPath=$your_path'
+var systemRegistriesConfPath = builtinRegistriesConfPath
+
+// builtinRegistriesConfPath is the path to registry configuration file
+// DO NOT change this, instead see systemRegistriesConfPath above.
+const builtinRegistriesConfPath = "/etc/containers/registries.conf"
+
+type registries struct {
+	Registries []string `toml:"registries"`
+}
+
+type tomlConfig struct {
+	Registries struct {
+		Search   registries `toml:"search"`
+		Insecure registries `toml:"insecure"`
+		Block    registries `toml:"block"`
+	} `toml:"registries"`
+}
+
+// Reads the global registry file from the filesystem. Returns
+// a byte array
+func readRegistryConf(ctx *types.SystemContext) ([]byte, error) {
+	dirPath := systemRegistriesConfPath
+	if ctx != nil {
+		if ctx.SystemRegistriesConfPath != "" {
+			dirPath = ctx.SystemRegistriesConfPath
+		} else if ctx.RootForImplicitAbsolutePaths != "" {
+			dirPath = filepath.Join(ctx.RootForImplicitAbsolutePaths, systemRegistriesConfPath)
+		}
+	}
+	configBytes, err := ioutil.ReadFile(dirPath)
+	return configBytes, err
+}
+
+// For mocking in unittests
+var readConf = readRegistryConf
+
+// Loads the registry configuration file from the filesystem and
+// then unmarshals it.  Returns the unmarshalled object.
+func loadRegistryConf(ctx *types.SystemContext) (*tomlConfig, error) {
+	config := &tomlConfig{}
+
+	configBytes, err := readConf(ctx)
+	if err != nil {
+		return nil, err
+	}
+
+	err = toml.Unmarshal(configBytes, &config)
+	return config, err
+}
+
+// GetRegistries returns an array of strings that contain the names
+// of the registries as defined in the system-wide
+// registries file.  it returns an empty array if none are
+// defined
+func GetRegistries(ctx *types.SystemContext) ([]string, error) {
+	config, err := loadRegistryConf(ctx)
+	if err != nil {
+		return nil, err
+	}
+	return config.Registries.Search.Registries, nil
+}
+
+// GetInsecureRegistries returns an array of strings that contain the names
+// of the insecure registries as defined in the system-wide
+// registries file.  it returns an empty array if none are
+// defined
+func GetInsecureRegistries(ctx *types.SystemContext) ([]string, error) {
+	config, err := loadRegistryConf(ctx)
+	if err != nil {
+		return nil, err
+	}
+	return config.Registries.Insecure.Registries, nil
+}