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|
package exec
import (
"bytes"
"context"
"fmt"
"os"
"runtime"
"strings"
"testing"
"time"
rspec "github.com/opencontainers/runtime-spec/specs-go"
"github.com/stretchr/testify/assert"
)
// path is the path to an example hook executable.
var path string
// unavoidableEnvironmentKeys may be injected even if the hook
// executable is executed with a requested empty environment.
var unavoidableEnvironmentKeys []string
func TestRun(t *testing.T) {
ctx := context.Background()
hook := &rspec.Hook{
Path: path,
Args: []string{"sh", "-c", "cat"},
}
var stderr, stdout bytes.Buffer
hookErr, err := Run(ctx, hook, []byte("{}"), &stdout, &stderr, DefaultPostKillTimeout)
if err != nil {
t.Fatal(err)
}
if hookErr != nil {
t.Fatal(hookErr)
}
assert.Equal(t, "{}", stdout.String())
assert.Equal(t, "", stderr.String())
}
func TestRunIgnoreOutput(t *testing.T) {
ctx := context.Background()
hook := &rspec.Hook{
Path: path,
Args: []string{"sh", "-c", "cat"},
}
hookErr, err := Run(ctx, hook, []byte("{}"), nil, nil, DefaultPostKillTimeout)
if err != nil {
t.Fatal(err)
}
if hookErr != nil {
t.Fatal(hookErr)
}
}
func TestRunFailedStart(t *testing.T) {
ctx := context.Background()
hook := &rspec.Hook{
Path: "/does/not/exist",
}
hookErr, err := Run(ctx, hook, []byte("{}"), nil, nil, DefaultPostKillTimeout)
if err == nil {
t.Fatal("unexpected success")
}
if !os.IsNotExist(err) {
t.Fatal(err)
}
assert.Equal(t, err, hookErr)
}
func parseEnvironment(input string) (env map[string]string, err error) {
env = map[string]string{}
lines := strings.Split(input, "\n")
for i, line := range lines {
if line == "" && i == len(lines)-1 {
continue // no content after the terminal newline
}
keyValue := strings.SplitN(line, "=", 2)
if len(keyValue) < 2 {
return env, fmt.Errorf("no = in environment line: %q", line)
}
env[keyValue[0]] = keyValue[1]
}
for _, key := range unavoidableEnvironmentKeys {
delete(env, key)
}
return env, nil
}
func TestRunEnvironment(t *testing.T) {
ctx := context.Background()
hook := &rspec.Hook{
Path: path,
Args: []string{"sh", "-c", "env"},
}
for _, test := range []struct {
name string
env []string
expected map[string]string
}{
{
name: "unset",
expected: map[string]string{},
},
{
name: "set empty",
env: []string{},
expected: map[string]string{},
},
{
name: "set",
env: []string{
"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
"TERM=xterm",
},
expected: map[string]string{
"PATH": "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
"TERM": "xterm",
},
},
} {
t.Run(test.name, func(t *testing.T) {
var stderr, stdout bytes.Buffer
hook.Env = test.env
hookErr, err := Run(ctx, hook, []byte("{}"), &stdout, &stderr, DefaultPostKillTimeout)
if err != nil {
t.Fatal(err)
}
if hookErr != nil {
t.Fatal(hookErr)
}
assert.Equal(t, "", stderr.String())
env, err := parseEnvironment(stdout.String())
if err != nil {
t.Fatal(err)
}
assert.Equal(t, test.expected, env)
})
}
}
func TestRunCancel(t *testing.T) {
hook := &rspec.Hook{
Path: path,
Args: []string{"sh", "-c", "echo waiting; sleep 2; echo done"},
}
one := 1
for _, test := range []struct {
name string
contextTimeout time.Duration
hookTimeout *int
expectedHookError string
expectedRunError error
expectedStdout string
}{
{
name: "no timeouts",
expectedStdout: "waiting\ndone\n",
},
{
name: "context timeout",
contextTimeout: time.Duration(1) * time.Second,
expectedStdout: "waiting\n",
expectedHookError: "^signal: killed$",
expectedRunError: context.DeadlineExceeded,
},
{
name: "hook timeout",
hookTimeout: &one,
expectedStdout: "waiting\n",
expectedHookError: "^signal: killed$",
expectedRunError: context.DeadlineExceeded,
},
} {
t.Run(test.name, func(t *testing.T) {
ctx := context.Background()
var stderr, stdout bytes.Buffer
if test.contextTimeout > 0 {
var cancel context.CancelFunc
ctx, cancel = context.WithTimeout(ctx, test.contextTimeout)
defer cancel()
}
hook.Timeout = test.hookTimeout
hookErr, err := Run(ctx, hook, []byte("{}"), &stdout, &stderr, DefaultPostKillTimeout)
assert.Equal(t, test.expectedRunError, err)
if test.expectedHookError == "" {
if hookErr != nil {
t.Fatal(hookErr)
}
} else {
assert.Regexp(t, test.expectedHookError, hookErr.Error())
}
assert.Equal(t, "", stderr.String())
assert.Equal(t, test.expectedStdout, stdout.String())
})
}
}
func TestRunKillTimeout(t *testing.T) {
ctx, cancel := context.WithTimeout(context.Background(), time.Duration(500)*time.Millisecond)
defer cancel()
hook := &rspec.Hook{
Path: path,
Args: []string{"sh", "-c", "sleep 1"},
}
hookErr, err := Run(ctx, hook, []byte("{}"), nil, nil, time.Duration(0))
assert.Equal(t, context.DeadlineExceeded, err)
assert.Regexp(t, "^failed to reap process within 0s of the kill signal$", hookErr)
}
func init() {
if runtime.GOOS != "windows" {
path = "/bin/sh"
unavoidableEnvironmentKeys = []string{"PWD", "SHLVL", "_"}
} else {
panic("we need a reliable executable path on Windows")
}
}
|
