Move to vendor

Signed-off-by: Olivier Gambier <olivier@docker.com>

vendor/google.golang.org/cloud/bigtable/internal/cbtrc/cbtrc.go

@@ -0,0 +1,105 @@
+/*
+Copyright 2015 Google Inc. All Rights Reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// Package cbtrc encapsulates common code for reading .cbtrc files.
+package cbtrc
+
+import (
+	"bufio"
+	"bytes"
+	"flag"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+// Config represents a configuration.
+type Config struct {
+	Project, Zone, Cluster string // required
+	Creds                  string // optional
+}
+
+// RegisterFlags registers a set of standard flags for this config.
+// It should be called before flag.Parse.
+func (c *Config) RegisterFlags() {
+	flag.StringVar(&c.Project, "project", c.Project, "project ID")
+	flag.StringVar(&c.Zone, "zone", c.Zone, "CBT zone")
+	flag.StringVar(&c.Cluster, "cluster", c.Cluster, "CBT cluster")
+	flag.StringVar(&c.Creds, "creds", c.Creds, "if set, use application credentials in this file")
+}
+
+// CheckFlags checks that the required config values are set.
+func (c *Config) CheckFlags() error {
+	var missing []string
+	if c.Project == "" {
+		missing = append(missing, "-project")
+	}
+	if c.Zone == "" {
+		missing = append(missing, "-zone")
+	}
+	if c.Cluster == "" {
+		missing = append(missing, "-cluster")
+	}
+	if len(missing) > 0 {
+		return fmt.Errorf("Missing %s", strings.Join(missing, " and "))
+	}
+	return nil
+}
+
+// Filename returns the filename consulted for standard configuration.
+func Filename() string {
+	// TODO(dsymonds): Might need tweaking for Windows.
+	return filepath.Join(os.Getenv("HOME"), ".cbtrc")
+}
+
+// Load loads a .cbtrc file.
+// If the file is not present, an empty config is returned.
+func Load() (*Config, error) {
+	filename := Filename()
+	data, err := ioutil.ReadFile(filename)
+	if err != nil {
+		// silent fail if the file isn't there
+		if os.IsNotExist(err) {
+			return &Config{}, nil
+		}
+		return nil, fmt.Errorf("Reading %s: %v", filename, err)
+	}
+	c := new(Config)
+	s := bufio.NewScanner(bytes.NewReader(data))
+	for s.Scan() {
+		line := s.Text()
+		i := strings.Index(line, "=")
+		if i < 0 {
+			return nil, fmt.Errorf("Bad line in %s: %q", filename, line)
+		}
+		key, val := strings.TrimSpace(line[:i]), strings.TrimSpace(line[i+1:])
+		switch key {
+		default:
+			return nil, fmt.Errorf("Unknown key in %s: %q", filename, key)
+		case "project":
+			c.Project = val
+		case "zone":
+			c.Zone = val
+		case "cluster":
+			c.Cluster = val
+		case "creds":
+			c.Creds = val
+		}
+	}
+	return c, s.Err()
+}