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// Copyright 2017 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.
package build
import (
"bufio"
"fmt"
"io"
"os"
"strings"
)
// Environment adds a number of useful manipulation functions to the list of
// strings returned by os.Environ() and used in exec.Cmd.Env.
type Environment []string
// OsEnvironment wraps the current environment returned by os.Environ()
func OsEnvironment() *Environment {
env := Environment(os.Environ())
return &env
}
// Get returns the value associated with the key, and whether it exists.
// It's equivalent to the os.LookupEnv function, but with this copy of the
// Environment.
func (e *Environment) Get(key string) (string, bool) {
for _, env := range *e {
if k, v, ok := decodeKeyValue(env); ok && k == key {
return v, true
}
}
return "", false
}
// Set sets the value associated with the key, overwriting the current value
// if it exists.
func (e *Environment) Set(key, value string) {
e.Unset(key)
*e = append(*e, key+"="+value)
}
// Unset removes the specified keys from the Environment.
func (e *Environment) Unset(keys ...string) {
out := (*e)[:0]
for _, env := range *e {
if key, _, ok := decodeKeyValue(env); ok && inList(key, keys) {
continue
}
out = append(out, env)
}
*e = out
}
// UnsetWithPrefix removes all keys that start with prefix.
func (e *Environment) UnsetWithPrefix(prefix string) {
out := (*e)[:0]
for _, env := range *e {
if key, _, ok := decodeKeyValue(env); ok && strings.HasPrefix(key, prefix) {
continue
}
out = append(out, env)
}
*e = out
}
// Environ returns the []string required for exec.Cmd.Env
func (e *Environment) Environ() []string {
return []string(*e)
}
// Copy returns a copy of the Environment so that independent changes may be made.
func (e *Environment) Copy() *Environment {
ret := Environment(make([]string, len(*e)))
for i, v := range *e {
ret[i] = v
}
return &ret
}
// IsTrue returns whether an environment variable is set to a positive value (1,y,yes,on,true)
func (e *Environment) IsEnvTrue(key string) bool {
if value, ok := e.Get(key); ok {
return value == "1" || value == "y" || value == "yes" || value == "on" || value == "true"
}
return false
}
// IsFalse returns whether an environment variable is set to a negative value (0,n,no,off,false)
func (e *Environment) IsFalse(key string) bool {
if value, ok := e.Get(key); ok {
return value == "0" || value == "n" || value == "no" || value == "off" || value == "false"
}
return false
}
// AppendFromKati reads a shell script written by Kati that exports or unsets
// environment variables, and applies those to the local Environment.
func (e *Environment) AppendFromKati(filename string) error {
file, err := os.Open(filename)
if err != nil {
return err
}
defer file.Close()
return e.appendFromKati(file)
}
func (e *Environment) appendFromKati(reader io.Reader) error {
scanner := bufio.NewScanner(reader)
for scanner.Scan() {
text := strings.TrimSpace(scanner.Text())
if len(text) == 0 || text[0] == '#' {
continue
}
cmd := strings.SplitN(text, " ", 2)
if len(cmd) != 2 {
return fmt.Errorf("Unknown kati environment line: %q", text)
}
if cmd[0] == "unset" {
str, ok := singleUnquote(cmd[1])
if !ok {
return fmt.Errorf("Failed to unquote kati line: %q", text)
}
e.Unset(str)
} else if cmd[0] == "export" {
key, value, ok := decodeKeyValue(cmd[1])
if !ok {
return fmt.Errorf("Failed to parse export: %v", cmd)
}
key, ok = singleUnquote(key)
if !ok {
return fmt.Errorf("Failed to unquote kati line: %q", text)
}
value, ok = singleUnquote(value)
if !ok {
return fmt.Errorf("Failed to unquote kati line: %q", text)
}
e.Set(key, value)
} else {
return fmt.Errorf("Unknown kati environment command: %q", text)
}
}
if err := scanner.Err(); err != nil {
return err
}
return nil
}
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