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// Tideland Go Library - Audit
//
// Copyright (C) 2013-2017 Frank Mueller / Tideland / Oldenburg / Germany
//
// All rights reserved. Use of this source code is governed
// by the new BSD license.
package audit
//--------------------
// IMPORTS
//--------------------
import (
"crypto/rand"
"fmt"
"os"
"path/filepath"
)
//--------------------
// TEMPDIR
//--------------------
// TempDir represents a temporary directory and possible subdirectories
// for testing purposes. It simply is created with
//
// assert := audit.NewTestingAssertion(t, false)
// td := audit.NewTempDir(assert)
// defer td.Restore()
//
// tdName := td.String()
// subName:= td.Mkdir("my", "sub", "directory")
//
// The deferred Restore() removes the temporary directory with all
// contents.
type TempDir struct {
assert Assertion
dir string
}
// NewTempDir creates a new temporary directory usable for direct
// usage or further subdirectories.
func NewTempDir(assert Assertion) *TempDir {
id := make([]byte, 8)
td := &TempDir{
assert: assert,
}
for i := 0; i < 256; i++ {
_, err := rand.Read(id[:])
td.assert.Nil(err)
dir := filepath.Join(os.TempDir(), fmt.Sprintf("gots-%x", id))
if err = os.Mkdir(dir, 0700); err == nil {
td.dir = dir
break
}
if td.dir == "" {
msg := fmt.Sprintf("cannot create temporary directory %q: %v", td.dir, err)
td.assert.Fail(msg)
return nil
}
}
return td
}
// Restore deletes the temporary directory and all contents.
func (td *TempDir) Restore() {
err := os.RemoveAll(td.dir)
if err != nil {
msg := fmt.Sprintf("cannot remove temporary directory %q: %v", td.dir, err)
td.assert.Fail(msg)
}
}
// Mkdir creates a potentially nested directory inside the
// temporary directory.
func (td *TempDir) Mkdir(name ...string) string {
innerName := filepath.Join(name...)
fullName := filepath.Join(td.dir, innerName)
if err := os.MkdirAll(fullName, 0700); err != nil {
msg := fmt.Sprintf("cannot create nested temporary directory %q: %v", fullName, err)
td.assert.Fail(msg)
}
return fullName
}
// String returns the temporary directory.
func (td *TempDir) String() string {
return td.dir
}
//--------------------
// ENVVARS
//--------------------
// EnvVars allows to change and restore environment variables. The
// same variable can be set multiple times. Simply do
//
// assert := audit.NewTestingAssertion(t, false)
// ev := audit.NewEnvVars(assert)
// defer ev.Restore()
//
// ev.Set("MY_VAR", myValue)
//
// ...
//
// ev.Set("MY_VAR", anotherValue)
//
// The deferred Restore() resets to the original values.
type EnvVars struct {
assert Assertion
vars map[string]string
}
// NewEnvVars creates
func NewEnvVars(assert Assertion) *EnvVars {
ev := &EnvVars{
assert: assert,
vars: make(map[string]string),
}
return ev
}
// Restore resets all changed environment variables
func (ev *EnvVars) Restore() {
for key, value := range ev.vars {
if err := os.Setenv(key, value); err != nil {
msg := fmt.Sprintf("cannot reset environment variable %q: %v", key, err)
ev.assert.Fail(msg)
}
}
}
// Set sets an environment variable to a new value.
func (ev *EnvVars) Set(key, value string) {
v := os.Getenv(key)
_, ok := ev.vars[key]
if !ok {
ev.vars[key] = v
}
if err := os.Setenv(key, value); err != nil {
msg := fmt.Sprintf("cannot set environment variable %q: %v", key, err)
ev.assert.Fail(msg)
}
}
// Unset unsets an environment variable.
func (ev *EnvVars) Unset(key string) {
v := os.Getenv(key)
_, ok := ev.vars[key]
if !ok {
ev.vars[key] = v
}
if err := os.Unsetenv(key); err != nil {
msg := fmt.Sprintf("cannot unset environment variable %q: %v", key, err)
ev.assert.Fail(msg)
}
}
// EOF
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