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. 17 package env 18 19 import ( 20 "encoding/json" 21 "fmt" 22 "io/ioutil" 23 "os" 24 "sort" 25 ) 26 27 type envFileEntry struct{ Key, Value string } 28 type envFileData []envFileEntry 29 30 func 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 53 func 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 87 func (e envFileData) Len() int { 88 return len(e) 89 } 90 91 func (e envFileData) Less(i, j int) bool { 92 return e[i].Key < e[j].Key 93 } 94 95 func (e envFileData) Swap(i, j int) { 96 e[i], e[j] = e[j], e[i] 97 } 98
