1// Copyright 2015 Google Inc. All rights reserved. 2// 3// Licensed under the Apache License, Version 2.0 (the "License"); 4// you may not use this file except in compliance with the License. 5// You may obtain a copy of the License at 6// 7// http://www.apache.org/licenses/LICENSE-2.0 8// 9// Unless required by applicable law or agreed to in writing, software 10// distributed under the License is distributed on an "AS IS" BASIS, 11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12// See the License for the specific language governing permissions and 13// limitations under the License. 14 15// env implements the environment JSON file handling for the soong_env command line tool run before 16// the builder and for the env writer in the builder. 17package env 18 19import ( 20 "encoding/json" 21 "fmt" 22 "io/ioutil" 23 "os" 24 "sort" 25) 26 27type envFileEntry struct{ Key, Value string } 28type envFileData []envFileEntry 29 30func WriteEnvFile(filename string, envDeps map[string]string) error { 31 contents := make(envFileData, 0, len(envDeps)) 32 for key, value := range envDeps { 33 contents = append(contents, envFileEntry{key, value}) 34 } 35 36 sort.Sort(contents) 37 38 data, err := json.MarshalIndent(contents, "", " ") 39 if err != nil { 40 return err 41 } 42 43 data = append(data, '\n') 44 45 err = ioutil.WriteFile(filename, data, 0664) 46 if err != nil { 47 return err 48 } 49 50 return nil 51} 52 53func StaleEnvFile(filename string) (bool, error) { 54 data, err := ioutil.ReadFile(filename) 55 if err != nil { 56 return true, err 57 } 58 59 var contents envFileData 60 61 err = json.Unmarshal(data, &contents) 62 if err != nil { 63 return true, err 64 } 65 66 var changed []string 67 for _, entry := range contents { 68 key := entry.Key 69 old := entry.Value 70 cur := os.Getenv(key) 71 if old != cur { 72 changed = append(changed, fmt.Sprintf("%s (%q -> %q)", key, old, cur)) 73 } 74 } 75 76 if len(changed) > 0 { 77 fmt.Printf("environment variables changed value:\n") 78 for _, s := range changed { 79 fmt.Printf(" %s\n", s) 80 } 81 return true, nil 82 } 83 84 return false, nil 85} 86 87func (e envFileData) Len() int { 88 return len(e) 89} 90 91func (e envFileData) Less(i, j int) bool { 92 return e[i].Key < e[j].Key 93} 94 95func (e envFileData) Swap(i, j int) { 96 e[i], e[j] = e[j], e[i] 97} 98