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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.
// env implements the environment JSON file handling for the soong_env command line tool run before
// the builder and for the env writer in the builder.
package env
import (
"encoding/json"
"fmt"
"io/ioutil"
"os"
"sort"
)
type envFileEntry struct{ Key, Value string }
type envFileData []envFileEntry
func WriteEnvFile(filename string, envDeps map[string]string) 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 err
}
data = append(data, '\n')
err = ioutil.WriteFile(filename, data, 0664)
if err != nil {
return err
}
return nil
}
func StaleEnvFile(filename string) (bool, error) {
data, err := ioutil.ReadFile(filename)
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 := os.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
}
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]
}
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