func spawn(cmd *exec.Cmd, _ *garden.TTYSpec, stdout io.Writer, stderr io.Writer) (process, io.WriteCloser, error) {
ro, wo, err := os.Pipe()
if err != nil {
return nil, nil, fmt.Errorf("pipe failed: %s", err)
}
re, we, err := os.Pipe()
if err != nil {
return nil, nil, fmt.Errorf("pipe failed: %s", err)
}
ri, wi, err := os.Pipe()
if err != nil {
return nil, nil, fmt.Errorf("pipe failed: %s", err)
}
go io.Copy(stdout, ro)
go io.Copy(stderr, re)
attr := &syscall.ProcAttr{
Dir: cmd.Dir,
Env: cmd.Env,
Files: []uintptr{ri.Fd(), wo.Fd(), we.Fd()},
}
lookedUpPath, err := lookExtensions(cmd.Path, cmd.Dir)
if err != nil {
return nil, nil, fmt.Errorf("look extensions failed: %s", err)
}
// Acquire the fork lock so that no other threads
// create new fds that are not yet close-on-exec
// before we fork.
syscall.ForkLock.Lock()
defer syscall.ForkLock.Unlock()
p, _ := syscall.GetCurrentProcess()
fd := make([]syscall.Handle, len(attr.Files))
for i := range attr.Files {
if attr.Files[i] > 0 {
err := syscall.DuplicateHandle(p, syscall.Handle(attr.Files[i]), p, &fd[i], 0, true, syscall.DUPLICATE_SAME_ACCESS)
if err != nil {
return nil, nil, fmt.Errorf("duplicating handle failed: %s", err)
}
defer syscall.CloseHandle(syscall.Handle(fd[i]))
}
}
si := new(syscall.StartupInfo)
si.Cb = uint32(unsafe.Sizeof(*si))
si.Flags = syscall.STARTF_USESTDHANDLES
si.StdInput = fd[0]
si.StdOutput = fd[1]
si.StdErr = fd[2]
pi := new(syscall.ProcessInformation)
flags := uint32(syscall.CREATE_UNICODE_ENVIRONMENT)
flags |= win32.CREATE_SUSPENDED
flags |= win32.CREATE_BREAKAWAY_FROM_JOB
argvp0, err := syscall.UTF16PtrFromString(lookedUpPath)
if err != nil {
return nil, nil, fmt.Errorf("stringing failed: %s", err)
}
argvp0v0v0v0, err := syscall.UTF16PtrFromString(makeCmdLine(cmd.Args))
if err != nil {
return nil, nil, fmt.Errorf("stringing failed: %s", err)
}
dirp, err := syscall.UTF16PtrFromString(attr.Dir)
if err != nil {
return nil, nil, fmt.Errorf("stringing failed: %s", err)
}
err = syscall.CreateProcess(
argvp0,
argvp0v0v0v0,
nil,
nil,
true,
flags,
createEnvBlock(attr.Env),
dirp,
si,
pi,
)
if err != nil {
return nil, nil, fmt.Errorf("create process: %s", err)
}
ri.Close()
wo.Close()
we.Close()
jobName, err := syscall.UTF16PtrFromString(fmt.Sprintf("%d", time.Now().UnixNano()))
if err != nil {
return nil, nil, fmt.Errorf("stringing failed: %s", err)
}
jobHandle, err := win32.CreateJobObject(nil, jobName)
if err != nil {
return nil, nil, fmt.Errorf("create job failed: %s", err)
}
err = win32.AssignProcessToJobObject(jobHandle, pi.Process)
if err != nil {
return nil, nil, fmt.Errorf("assign failed: %s", err)
}
_, err = win32.ResumeThread(pi.Thread)
if err != nil {
return nil, nil, fmt.Errorf("resume failed: %s", err)
}
return &jobProcess{
jobHandle: jobHandle,
processHandle: pi.Process,
}, wi, nil
}
func startProcessAsUser(
argv0 string, argv []string,
username string, domain string, password string,
attr *syscall.ProcAttr,
) (pid int, handle uintptr, err error) {
if len(argv0) == 0 {
return 0, 0, syscall.EWINDOWS
}
if attr == nil {
attr = &zeroProcAttr
}
sys := attr.Sys
if sys == nil {
sys = &zeroSysProcAttr
}
if len(attr.Files) > 3 {
return 0, 0, syscall.EWINDOWS
}
if len(attr.Files) < 3 {
return 0, 0, syscall.EINVAL
}
if len(attr.Dir) != 0 {
// StartProcess assumes that argv0 is relative to attr.Dir,
// because it implies Chdir(attr.Dir) before executing argv0.
// Windows CreateProcess assumes the opposite: it looks for
// argv0 relative to the current directory, and, only once the new
// process is started, it does Chdir(attr.Dir). We are adjusting
// for that difference here by making argv0 absolute.
var err error
argv0, err = joinExeDirAndFName(attr.Dir, argv0)
if err != nil {
return 0, 0, err
}
}
argv0p, err := syscall.UTF16PtrFromString(argv0)
if err != nil {
return 0, 0, err
}
var cmdline string
// Windows CreateProcess takes the command line as a single string:
// use attr.CmdLine if set, else build the command line by escaping
// and joining each argument with spaces
if sys.CmdLine != "" {
cmdline = sys.CmdLine
} else {
cmdline = makeCmdLine(argv)
}
var argvp *uint16
if len(cmdline) != 0 {
argvp, err = syscall.UTF16PtrFromString(cmdline)
if err != nil {
return 0, 0, err
}
}
// Acquire the fork lock so that no other threads
// create new fds that are not yet close-on-exec
// before we fork.
syscall.ForkLock.Lock()
defer syscall.ForkLock.Unlock()
p, _ := syscall.GetCurrentProcess()
fd := make([]syscall.Handle, len(attr.Files))
for i := range attr.Files {
if attr.Files[i] > 0 {
err = syscall.DuplicateHandle(p, syscall.Handle(attr.Files[i]), p, &fd[i], 0, true, syscall.DUPLICATE_SAME_ACCESS)
if err != nil {
return 0, 0, errors.New("DuplicateHandle: " + err.Error())
}
defer syscall.CloseHandle(syscall.Handle(fd[i]))
}
}
si := new(syscall.StartupInfo)
si.Cb = uint32(unsafe.Sizeof(*si))
si.Flags = syscall.STARTF_USESTDHANDLES
if sys.HideWindow {
si.Flags |= syscall.STARTF_USESHOWWINDOW
si.ShowWindow = syscall.SW_HIDE
}
si.StdInput = fd[0]
si.StdOutput = fd[1]
si.StdErr = fd[2]
token, err := logonUser(username, domain, password, logon32LogonInteractive, logon32ProviderDefault)
if err != nil {
return 0, 0, errors.New("logonUser: "******"createEnvironmentBlock: " + err.Error())
}
env = &e[0]
} else {
env = createEnvBlock(attr.Env)
}
err = impersonateLoggedOnUser(token)
if err != nil {
return 0, 0, errors.New("impersonateLoggedOnUser: "******"createProcessAsUser: " + err.Error())
}
defer syscall.CloseHandle(syscall.Handle(pi.Thread))
return int(pi.ProcessId), uintptr(pi.Process), nil
}