Migrate Sirupsen to sirupsen.

vendor/github.com/docker/docker-credential-helpers/pass/pass_linux.go

@@ -0,0 +1,239 @@
+// A `pass` based credential helper. Passwords are stored as arguments to pass
+// of the form: "$PASS_FOLDER/base64-url(serverURL)/username". We base64-url
+// encode the serverURL, because under the hood pass uses files and folders, so
+// /s will get translated into additional folders.
+package pass
+
+import (
+	"encoding/base64"
+	"errors"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"os/exec"
+	"path"
+	"strings"
+
+	"github.com/docker/docker-credential-helpers/credentials"
+)
+
+const PASS_FOLDER = "docker-credential-helpers"
+
+var (
+	PassInitialized bool
+)
+
+func init() {
+	// In principle, we could just run `pass init`. However, pass has a bug
+	// where if gpg fails, it doesn't always exit 1. Additionally, pass
+	// uses gpg2, but gpg is the default, which may be confusing. So let's
+	// just explictily check that pass actually can store and retreive a
+	// password.
+	password := "pass is initialized"
+	name := path.Join(PASS_FOLDER, "docker-pass-initialized-check")
+
+	_, err := runPass(password, "insert", "-f", "-m", name)
+	if err != nil {
+		return
+	}
+
+	stored, err := runPass("", "show", name)
+	PassInitialized = err == nil && stored == password
+
+	if PassInitialized {
+		runPass("", "rm", "-rf", name)
+	}
+}
+
+func runPass(stdinContent string, args ...string) (string, error) {
+	cmd := exec.Command("pass", args...)
+
+	stdin, err := cmd.StdinPipe()
+	if err != nil {
+		return "", err
+	}
+	defer stdin.Close()
+
+	stderr, err := cmd.StderrPipe()
+	if err != nil {
+		return "", err
+	}
+	defer stderr.Close()
+
+	stdout, err := cmd.StdoutPipe()
+	if err != nil {
+		return "", err
+	}
+	defer stdout.Close()
+
+	err = cmd.Start()
+	if err != nil {
+		return "", err
+	}
+
+	_, err = stdin.Write([]byte(stdinContent))
+	if err != nil {
+		return "", err
+	}
+	stdin.Close()
+
+	errContent, err := ioutil.ReadAll(stderr)
+	if err != nil {
+		return "", fmt.Errorf("error reading stderr: %s", err)
+	}
+
+	result, err := ioutil.ReadAll(stdout)
+	if err != nil {
+		return "", fmt.Errorf("Error reading stdout: %s", err)
+	}
+
+	cmdErr := cmd.Wait()
+	if cmdErr != nil {
+		return "", fmt.Errorf("%s: %s", cmdErr, errContent)
+	}
+
+	return string(result), nil
+}
+
+// Pass handles secrets using Linux secret-service as a store.
+type Pass struct{}
+
+// Add adds new credentials to the keychain.
+func (h Pass) Add(creds *credentials.Credentials) error {
+	if !PassInitialized {
+		return errors.New("pass store is uninitialized")
+	}
+
+	if creds == nil {
+		return errors.New("missing credentials")
+	}
+
+	encoded := base64.URLEncoding.EncodeToString([]byte(creds.ServerURL))
+
+	_, err := runPass(creds.Secret, "insert", "-f", "-m", path.Join(PASS_FOLDER, encoded, creds.Username))
+	return err
+}
+
+// Delete removes credentials from the store.
+func (h Pass) Delete(serverURL string) error {
+	if !PassInitialized {
+		return errors.New("pass store is uninitialized")
+	}
+
+	if serverURL == "" {
+		return errors.New("missing server url")
+	}
+
+	encoded := base64.URLEncoding.EncodeToString([]byte(serverURL))
+	_, err := runPass("", "rm", "-rf", path.Join(PASS_FOLDER, encoded))
+	return err
+}
+
+func getPassDir() string {
+	passDir := os.ExpandEnv("$HOME/.password-store")
+	for _, e := range os.Environ() {
+		parts := strings.SplitN(e, "=", 2)
+		if len(parts) < 2 {
+			continue
+		}
+
+		if parts[0] != "PASSWORD_STORE_DIR" {
+			continue
+		}
+
+		passDir = parts[1]
+		break
+	}
+
+	return passDir
+}
+
+// listPassDir lists all the contents of a directory in the password store.
+// Pass uses fancy unicode to emit stuff to stdout, so rather than try
+// and parse this, let's just look at the directory structure instead.
+func listPassDir(args ...string) ([]os.FileInfo, error) {
+	passDir := getPassDir()
+	p := path.Join(append([]string{passDir, PASS_FOLDER}, args...)...)
+	contents, err := ioutil.ReadDir(p)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return []os.FileInfo{}, nil
+		}
+
+		return nil, err
+	}
+
+	return contents, nil
+}
+
+// Get returns the username and secret to use for a given registry server URL.
+func (h Pass) Get(serverURL string) (string, string, error) {
+	if !PassInitialized {
+		return "", "", errors.New("pass store is uninitialized")
+	}
+
+	if serverURL == "" {
+		return "", "", errors.New("missing server url")
+	}
+
+	encoded := base64.URLEncoding.EncodeToString([]byte(serverURL))
+
+	if _, err := os.Stat(path.Join(getPassDir(), PASS_FOLDER, encoded)); err != nil {
+		if os.IsNotExist(err) {
+			return "", "", nil;
+		}
+
+		return "", "", err
+	}
+
+	usernames, err := listPassDir(encoded)
+	if err != nil {
+		return "", "", err
+	}
+
+	if len(usernames) < 1 {
+		return "", "", fmt.Errorf("no usernames for %s", serverURL)
+	}
+
+	actual := strings.TrimSuffix(usernames[0].Name(), ".gpg")
+	secret, err := runPass("", "show", path.Join(PASS_FOLDER, encoded, actual))
+	return actual, secret, err
+}
+
+// List returns the stored URLs and corresponding usernames for a given credentials label
+func (h Pass) List() (map[string]string, error) {
+	if !PassInitialized {
+		return nil, errors.New("pass store is uninitialized")
+	}
+
+	servers, err := listPassDir()
+	if err != nil {
+		return nil, err
+	}
+
+	resp := map[string]string{}
+
+	for _, server := range servers {
+		if !server.IsDir() {
+			continue
+		}
+
+		serverURL, err := base64.URLEncoding.DecodeString(server.Name())
+		if err != nil {
+			return nil, err
+		}
+
+		usernames, err := listPassDir(server.Name())
+		if err != nil {
+			return nil, err
+		}
+
+		if len(usernames) < 1 {
+			return nil, fmt.Errorf("no usernames for %s", serverURL)
+		}
+
+		resp[string(serverURL)] = strings.TrimSuffix(usernames[0].Name(), ".gpg")
+	}
+
+	return resp, nil
+}