mirror of https://github.com/docker/cli.git
119 lines
3.0 KiB
Go
119 lines
3.0 KiB
Go
/*Package env provides functions to test code that read environment variables
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or the current working directory.
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*/
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package env // import "gotest.tools/v3/env"
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import (
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"os"
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"strings"
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"gotest.tools/v3/assert"
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"gotest.tools/v3/internal/cleanup"
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)
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type helperT interface {
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Helper()
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}
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// Patch changes the value of an environment variable, and returns a
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// function which will reset the the value of that variable back to the
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// previous state.
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//
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// When used with Go 1.14+ the unpatch function will be called automatically
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// when the test ends, unless the TEST_NOCLEANUP env var is set to true.
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func Patch(t assert.TestingT, key, value string) func() {
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if ht, ok := t.(helperT); ok {
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ht.Helper()
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}
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oldValue, envVarExists := os.LookupEnv(key)
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assert.NilError(t, os.Setenv(key, value))
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clean := func() {
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if ht, ok := t.(helperT); ok {
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ht.Helper()
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}
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if !envVarExists {
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assert.NilError(t, os.Unsetenv(key))
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return
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}
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assert.NilError(t, os.Setenv(key, oldValue))
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}
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cleanup.Cleanup(t, clean)
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return clean
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}
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// PatchAll sets the environment to env, and returns a function which will
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// reset the environment back to the previous state.
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//
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// When used with Go 1.14+ the unpatch function will be called automatically
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// when the test ends, unless the TEST_NOCLEANUP env var is set to true.
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func PatchAll(t assert.TestingT, env map[string]string) func() {
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if ht, ok := t.(helperT); ok {
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ht.Helper()
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}
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oldEnv := os.Environ()
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os.Clearenv()
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for key, value := range env {
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assert.NilError(t, os.Setenv(key, value), "setenv %s=%s", key, value)
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}
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clean := func() {
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if ht, ok := t.(helperT); ok {
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ht.Helper()
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}
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os.Clearenv()
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for key, oldVal := range ToMap(oldEnv) {
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assert.NilError(t, os.Setenv(key, oldVal), "setenv %s=%s", key, oldVal)
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}
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}
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cleanup.Cleanup(t, clean)
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return clean
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}
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// ToMap takes a list of strings in the format returned by os.Environ() and
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// returns a mapping of keys to values.
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func ToMap(env []string) map[string]string {
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result := map[string]string{}
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for _, raw := range env {
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key, value := getParts(raw)
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result[key] = value
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}
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return result
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}
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func getParts(raw string) (string, string) {
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if raw == "" {
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return "", ""
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}
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// Environment variables on windows can begin with =
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// http://blogs.msdn.com/b/oldnewthing/archive/2010/05/06/10008132.aspx
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parts := strings.SplitN(raw[1:], "=", 2)
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key := raw[:1] + parts[0]
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if len(parts) == 1 {
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return key, ""
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}
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return key, parts[1]
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}
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// ChangeWorkingDir to the directory, and return a function which restores the
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// previous working directory.
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//
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// When used with Go 1.14+ the previous working directory will be restored
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// automatically when the test ends, unless the TEST_NOCLEANUP env var is set to
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// true.
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func ChangeWorkingDir(t assert.TestingT, dir string) func() {
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if ht, ok := t.(helperT); ok {
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ht.Helper()
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}
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cwd, err := os.Getwd()
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assert.NilError(t, err)
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assert.NilError(t, os.Chdir(dir))
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clean := func() {
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if ht, ok := t.(helperT); ok {
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ht.Helper()
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}
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assert.NilError(t, os.Chdir(cwd))
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}
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cleanup.Cleanup(t, clean)
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return clean
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}
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