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