зеркало из https://github.com/microsoft/docker.git
108 строки
2.3 KiB
Go
108 строки
2.3 KiB
Go
package libcontainerd
|
|
|
|
import (
|
|
"fmt"
|
|
"io"
|
|
"os"
|
|
"path/filepath"
|
|
"syscall"
|
|
|
|
containerd "github.com/docker/containerd/api/grpc/types"
|
|
"github.com/docker/docker/pkg/ioutils"
|
|
"golang.org/x/net/context"
|
|
)
|
|
|
|
var fdNames = map[int]string{
|
|
syscall.Stdin: "stdin",
|
|
syscall.Stdout: "stdout",
|
|
syscall.Stderr: "stderr",
|
|
}
|
|
|
|
// process keeps the state for both main container process and exec process.
|
|
type process struct {
|
|
processCommon
|
|
|
|
// Platform specific fields are below here.
|
|
dir string
|
|
}
|
|
|
|
func (p *process) openFifos(terminal bool) (*IOPipe, error) {
|
|
bundleDir := p.dir
|
|
if err := os.MkdirAll(bundleDir, 0700); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
for i := 0; i < 3; i++ {
|
|
f := p.fifo(i)
|
|
if err := syscall.Mkfifo(f, 0700); err != nil && !os.IsExist(err) {
|
|
return nil, fmt.Errorf("mkfifo: %s %v", f, err)
|
|
}
|
|
}
|
|
|
|
io := &IOPipe{}
|
|
stdinf, err := os.OpenFile(p.fifo(syscall.Stdin), syscall.O_RDWR, 0)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
io.Stdout = openReaderFromFifo(p.fifo(syscall.Stdout))
|
|
if !terminal {
|
|
io.Stderr = openReaderFromFifo(p.fifo(syscall.Stderr))
|
|
} else {
|
|
io.Stderr = emptyReader{}
|
|
}
|
|
|
|
io.Stdin = ioutils.NewWriteCloserWrapper(stdinf, func() error {
|
|
stdinf.Close()
|
|
_, err := p.client.remote.apiClient.UpdateProcess(context.Background(), &containerd.UpdateProcessRequest{
|
|
Id: p.containerID,
|
|
Pid: p.friendlyName,
|
|
CloseStdin: true,
|
|
})
|
|
return err
|
|
})
|
|
|
|
return io, nil
|
|
}
|
|
|
|
func (p *process) closeFifos(io *IOPipe) {
|
|
io.Stdin.Close()
|
|
closeReaderFifo(p.fifo(syscall.Stdout))
|
|
closeReaderFifo(p.fifo(syscall.Stderr))
|
|
}
|
|
|
|
type emptyReader struct{}
|
|
|
|
func (r emptyReader) Read(b []byte) (int, error) {
|
|
return 0, io.EOF
|
|
}
|
|
|
|
func openReaderFromFifo(fn string) io.Reader {
|
|
r, w := io.Pipe()
|
|
go func() {
|
|
stdoutf, err := os.OpenFile(fn, syscall.O_RDONLY, 0)
|
|
if err != nil {
|
|
r.CloseWithError(err)
|
|
}
|
|
if _, err := io.Copy(w, stdoutf); err != nil {
|
|
r.CloseWithError(err)
|
|
}
|
|
w.Close()
|
|
stdoutf.Close()
|
|
}()
|
|
return r
|
|
}
|
|
|
|
// closeReaderFifo closes fifo that may be blocked on open by opening the write side.
|
|
func closeReaderFifo(fn string) {
|
|
f, err := os.OpenFile(fn, syscall.O_WRONLY|syscall.O_NONBLOCK, 0)
|
|
if err != nil {
|
|
return
|
|
}
|
|
f.Close()
|
|
}
|
|
|
|
func (p *process) fifo(index int) string {
|
|
return filepath.Join(p.dir, p.friendlyName+"-"+fdNames[index])
|
|
}
|