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/
environment.go
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/
environment.go
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// Copyright 2016 The rkt Authors
//
// 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 common
import (
"bufio"
"bytes"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"github.com/rkt/rkt/pkg/user"
"github.com/appc/spec/schema/types"
)
const DefaultPath = "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
var defaultEnv = map[string]string{
"PATH": DefaultPath,
"SHELL": "/bin/sh",
"USER": "root",
"LOGNAME": "root",
"HOME": "/root",
}
// WriteEnvFile creates an environment file for given app name. To
// ensure the minimum required environment variables by the appc spec
// are set to sensible defaults, env should be the result of calling
// ComposeEnviron. The containing directory and its ancestors will be
// created if necessary.
func WriteEnvFile(env []string, uidRange *user.UidRange, envFilePath string) error {
ef := bytes.Buffer{}
for _, v := range env {
fmt.Fprintf(&ef, "%s\n", v)
}
if err := os.MkdirAll(filepath.Dir(envFilePath), 0755); err != nil {
return err
}
if err := ioutil.WriteFile(envFilePath, ef.Bytes(), 0644); err != nil {
return err
}
if err := user.ShiftFiles([]string{envFilePath}, uidRange); err != nil {
return err
}
return nil
}
// ReadEnvFileRaw reads the environment file, returning it as a
// slice of strings, each expected but not checked to be of the form
// "key=value". (The suffix leaves room for a function which parallels
// WriteEnvFile, which splits each string and has a return type of
// types.Environment.)
func ReadEnvFileRaw(envFilePath string) ([]string, error) {
var env []string
var envFile *os.File
var err error
if envFile, err = os.Open(envFilePath); err != nil {
return nil, err
}
defer envFile.Close()
scanner := bufio.NewScanner(envFile)
for scanner.Scan() {
env = append(env, scanner.Text())
}
if err = scanner.Err(); err != nil {
return nil, err
}
return env, nil
}
// ComposeEnviron formats the environment into a slice of strings,
// each of the form "key=value". The minimum required environment
// variables by the appc spec will be set to sensible defaults here if
// they're not provided by env.
func ComposeEnviron(env types.Environment) []string {
var composed []string
for dk, dv := range defaultEnv {
if _, exists := env.Get(dk); !exists {
composed = append(composed, fmt.Sprintf("%s=%s", dk, dv))
}
}
for _, e := range env {
composed = append(composed, fmt.Sprintf("%s=%s", e.Name, e.Value))
}
return composed
}