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- // 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.
- // Implements the environment JSON file handling for serializing the
- // environment variables that were used in soong_build so that soong_ui can
- // check whether they have changed
- package shared
- import (
- "encoding/json"
- "fmt"
- "io/ioutil"
- "sort"
- )
- type envFileEntry struct{ Key, Value string }
- type envFileData []envFileEntry
- // Serializes the given environment variable name/value map into JSON formatted bytes by converting
- // to envFileEntry values and marshaling them.
- //
- // e.g. OUT_DIR = "out"
- // is converted to:
- //
- // {
- // "Key": "OUT_DIR",
- // "Value": "out",
- // },
- func EnvFileContents(envDeps map[string]string) ([]byte, error) {
- contents := make(envFileData, 0, len(envDeps))
- for key, value := range envDeps {
- contents = append(contents, envFileEntry{key, value})
- }
- sort.Sort(contents)
- data, err := json.MarshalIndent(contents, "", " ")
- if err != nil {
- return nil, err
- }
- data = append(data, '\n')
- return data, nil
- }
- // Reads and deserializes a Soong environment file located at the given file path to determine its
- // staleness. If any environment variable values have changed, it prints them out and returns true.
- // Failing to read or parse the file also causes it to return true.
- func StaleEnvFile(filepath string, getenv func(string) string) (bool, error) {
- data, err := ioutil.ReadFile(filepath)
- if err != nil {
- return true, err
- }
- var contents envFileData
- err = json.Unmarshal(data, &contents)
- if err != nil {
- return true, err
- }
- var changed []string
- for _, entry := range contents {
- key := entry.Key
- old := entry.Value
- cur := getenv(key)
- if old != cur {
- changed = append(changed, fmt.Sprintf("%s (%q -> %q)", key, old, cur))
- }
- }
- if len(changed) > 0 {
- fmt.Printf("environment variables changed value:\n")
- for _, s := range changed {
- fmt.Printf(" %s\n", s)
- }
- return true, nil
- }
- return false, nil
- }
- // Deserializes and environment serialized by EnvFileContents() and returns it
- // as a map[string]string.
- func EnvFromFile(envFile string) (map[string]string, error) {
- result := make(map[string]string)
- data, err := ioutil.ReadFile(envFile)
- if err != nil {
- return result, err
- }
- var contents envFileData
- err = json.Unmarshal(data, &contents)
- if err != nil {
- return result, err
- }
- for _, entry := range contents {
- result[entry.Key] = entry.Value
- }
- return result, nil
- }
- // Implements sort.Interface so that we can use sort.Sort on envFileData arrays.
- func (e envFileData) Len() int {
- return len(e)
- }
- func (e envFileData) Less(i, j int) bool {
- return e[i].Key < e[j].Key
- }
- func (e envFileData) Swap(i, j int) {
- e[i], e[j] = e[j], e[i]
- }
- var _ sort.Interface = envFileData{}
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