96 lines
2.4 KiB
Go
96 lines
2.4 KiB
Go
package helper
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import (
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"io"
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"os"
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"os/exec"
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"strconv"
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"syscall"
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"testing"
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)
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// InternalChildStub is an internal function but exported because it is cross-package;
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// it is part of the implementation of the helper stub.
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func InternalChildStub() {
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// this test mocks the helper process
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if os.Getenv(FortifyHelper) != "1" {
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return
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}
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// simulate args pipe behaviour
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func() {
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f := os.NewFile(3, "|0")
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if f == nil {
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panic("attempted to start helper without args pipe")
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}
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if _, err := io.Copy(os.Stdout, f); err != nil {
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panic("cannot read args: " + err.Error())
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}
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}()
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var wait chan struct{}
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// simulate status pipe behaviour
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if os.Getenv(FortifyStatus) == "1" {
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wait = make(chan struct{})
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go func() {
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f := os.NewFile(4, "|1")
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if f == nil {
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panic("attempted to start with status reporting without status pipe")
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}
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if _, err := f.Write([]byte{'x'}); err != nil {
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panic("cannot write to status pipe: " + err.Error())
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}
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// wait for status pipe close
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var epoll int
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if fd, err := syscall.EpollCreate1(0); err != nil {
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panic("cannot open epoll fd: " + err.Error())
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} else {
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defer func() {
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if err = syscall.Close(fd); err != nil {
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panic("cannot close epoll fd: " + err.Error())
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}
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}()
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epoll = fd
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}
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if err := syscall.EpollCtl(epoll, syscall.EPOLL_CTL_ADD, int(f.Fd()), &syscall.EpollEvent{}); err != nil {
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panic("cannot add status pipe to epoll: " + err.Error())
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}
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events := make([]syscall.EpollEvent, 1)
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if _, err := syscall.EpollWait(epoll, events, -1); err != nil {
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panic("cannot poll status pipe: " + err.Error())
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}
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if events[0].Events != syscall.EPOLLERR {
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panic(strconv.Itoa(int(events[0].Events)))
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}
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close(wait)
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}()
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}
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if wait != nil {
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<-wait
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}
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}
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// InternalReplaceExecCommand is an internal function but exported because it is cross-package;
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// it is part of the implementation of the helper stub.
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func InternalReplaceExecCommand(t *testing.T) {
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t.Cleanup(func() {
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execCommand = exec.Command
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})
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// replace execCommand to have the resulting *exec.Cmd launch TestHelperChildStub
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execCommand = func(name string, arg ...string) *exec.Cmd {
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// pass through nonexistent path
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if name == "/nonexistent" && len(arg) == 0 {
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return exec.Command(name)
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}
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return exec.Command(os.Args[0], append([]string{"-test.run=TestHelperChildStub", "--", name}, arg...)...)
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}
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}
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