Use buildah commit and bud in podman

Vendor in buildah and use as much of commit and bug as possible for podman
build and commit.

Resolves #586
Signed-off-by: baude <bbaude@redhat.com>

Closes: #681
Approved by: mheon

vendor/github.com/fsouza/go-dockerclient/auth.go

@@ -0,0 +1,185 @@
+// Copyright 2015 go-dockerclient authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package docker
+
+import (
+	"bytes"
+	"encoding/base64"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"os"
+	"path"
+	"strings"
+)
+
+// ErrCannotParseDockercfg is the error returned by NewAuthConfigurations when the dockercfg cannot be parsed.
+var ErrCannotParseDockercfg = errors.New("Failed to read authentication from dockercfg")
+
+// AuthConfiguration represents authentication options to use in the PushImage
+// method. It represents the authentication in the Docker index server.
+type AuthConfiguration struct {
+	Username      string `json:"username,omitempty"`
+	Password      string `json:"password,omitempty"`
+	Email         string `json:"email,omitempty"`
+	ServerAddress string `json:"serveraddress,omitempty"`
+}
+
+// AuthConfigurations represents authentication options to use for the
+// PushImage method accommodating the new X-Registry-Config header
+type AuthConfigurations struct {
+	Configs map[string]AuthConfiguration `json:"configs"`
+}
+
+// AuthConfigurations119 is used to serialize a set of AuthConfigurations
+// for Docker API >= 1.19.
+type AuthConfigurations119 map[string]AuthConfiguration
+
+// dockerConfig represents a registry authentation configuration from the
+// .dockercfg file.
+type dockerConfig struct {
+	Auth  string `json:"auth"`
+	Email string `json:"email"`
+}
+
+// NewAuthConfigurationsFromFile returns AuthConfigurations from a path containing JSON
+// in the same format as the .dockercfg file.
+func NewAuthConfigurationsFromFile(path string) (*AuthConfigurations, error) {
+	r, err := os.Open(path)
+	if err != nil {
+		return nil, err
+	}
+	return NewAuthConfigurations(r)
+}
+
+func cfgPaths(dockerConfigEnv string, homeEnv string) []string {
+	var paths []string
+	if dockerConfigEnv != "" {
+		paths = append(paths, path.Join(dockerConfigEnv, "config.json"))
+	}
+	if homeEnv != "" {
+		paths = append(paths, path.Join(homeEnv, ".docker", "config.json"))
+		paths = append(paths, path.Join(homeEnv, ".dockercfg"))
+	}
+	return paths
+}
+
+// NewAuthConfigurationsFromDockerCfg returns AuthConfigurations from
+// system config files. The following files are checked in the order listed:
+// - $DOCKER_CONFIG/config.json if DOCKER_CONFIG set in the environment,
+// - $HOME/.docker/config.json
+// - $HOME/.dockercfg
+func NewAuthConfigurationsFromDockerCfg() (*AuthConfigurations, error) {
+	err := fmt.Errorf("No docker configuration found")
+	var auths *AuthConfigurations
+
+	pathsToTry := cfgPaths(os.Getenv("DOCKER_CONFIG"), os.Getenv("HOME"))
+	for _, path := range pathsToTry {
+		auths, err = NewAuthConfigurationsFromFile(path)
+		if err == nil {
+			return auths, nil
+		}
+	}
+	return auths, err
+}
+
+// NewAuthConfigurations returns AuthConfigurations from a JSON encoded string in the
+// same format as the .dockercfg file.
+func NewAuthConfigurations(r io.Reader) (*AuthConfigurations, error) {
+	var auth *AuthConfigurations
+	confs, err := parseDockerConfig(r)
+	if err != nil {
+		return nil, err
+	}
+	auth, err = authConfigs(confs)
+	if err != nil {
+		return nil, err
+	}
+	return auth, nil
+}
+
+func parseDockerConfig(r io.Reader) (map[string]dockerConfig, error) {
+	buf := new(bytes.Buffer)
+	buf.ReadFrom(r)
+	byteData := buf.Bytes()
+
+	confsWrapper := struct {
+		Auths map[string]dockerConfig `json:"auths"`
+	}{}
+	if err := json.Unmarshal(byteData, &confsWrapper); err == nil {
+		if len(confsWrapper.Auths) > 0 {
+			return confsWrapper.Auths, nil
+		}
+	}
+
+	var confs map[string]dockerConfig
+	if err := json.Unmarshal(byteData, &confs); err != nil {
+		return nil, err
+	}
+	return confs, nil
+}
+
+// authConfigs converts a dockerConfigs map to a AuthConfigurations object.
+func authConfigs(confs map[string]dockerConfig) (*AuthConfigurations, error) {
+	c := &AuthConfigurations{
+		Configs: make(map[string]AuthConfiguration),
+	}
+	for reg, conf := range confs {
+		if conf.Auth == "" {
+			continue
+		}
+		data, err := base64.StdEncoding.DecodeString(conf.Auth)
+		if err != nil {
+			return nil, err
+		}
+		userpass := strings.SplitN(string(data), ":", 2)
+		if len(userpass) != 2 {
+			return nil, ErrCannotParseDockercfg
+		}
+		c.Configs[reg] = AuthConfiguration{
+			Email:         conf.Email,
+			Username:      userpass[0],
+			Password:      userpass[1],
+			ServerAddress: reg,
+		}
+	}
+	return c, nil
+}
+
+// AuthStatus returns the authentication status for Docker API versions >= 1.23.
+type AuthStatus struct {
+	Status        string `json:"Status,omitempty" yaml:"Status,omitempty" toml:"Status,omitempty"`
+	IdentityToken string `json:"IdentityToken,omitempty" yaml:"IdentityToken,omitempty" toml:"IdentityToken,omitempty"`
+}
+
+// AuthCheck validates the given credentials. It returns nil if successful.
+//
+// For Docker API versions >= 1.23, the AuthStatus struct will be populated, otherwise it will be empty.`
+//
+// See https://goo.gl/6nsZkH for more details.
+func (c *Client) AuthCheck(conf *AuthConfiguration) (AuthStatus, error) {
+	var authStatus AuthStatus
+	if conf == nil {
+		return authStatus, errors.New("conf is nil")
+	}
+	resp, err := c.do("POST", "/auth", doOptions{data: conf})
+	if err != nil {
+		return authStatus, err
+	}
+	defer resp.Body.Close()
+	data, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return authStatus, err
+	}
+	if len(data) == 0 {
+		return authStatus, nil
+	}
+	if err := json.Unmarshal(data, &authStatus); err != nil {
+		return authStatus, err
+	}
+	return authStatus, nil
+}