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io_unix.go
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/
io_unix.go
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// +build !windows
package containerd
import (
"context"
"io"
"io/ioutil"
"os"
"path/filepath"
"sync"
"syscall"
"github.com/containerd/fifo"
)
// NewFifos returns a new set of fifos for the task
func NewFifos(id string) (*FIFOSet, error) {
root := filepath.Join(os.TempDir(), "containerd")
if err := os.MkdirAll(root, 0700); err != nil {
return nil, err
}
dir, err := ioutil.TempDir(root, "")
if err != nil {
return nil, err
}
return &FIFOSet{
Dir: dir,
In: filepath.Join(dir, id+"-stdin"),
Out: filepath.Join(dir, id+"-stdout"),
Err: filepath.Join(dir, id+"-stderr"),
}, nil
}
func copyIO(fifos *FIFOSet, ioset *ioSet, tty bool) (_ *wgCloser, err error) {
var (
f io.ReadWriteCloser
set []io.Closer
cwg sync.WaitGroup
ctx, cancel = context.WithCancel(context.Background())
wg = &sync.WaitGroup{}
)
defer func() {
if err != nil {
for _, f := range set {
f.Close()
}
cancel()
}
}()
if f, err = fifo.OpenFifo(ctx, fifos.In, syscall.O_WRONLY|syscall.O_CREAT|syscall.O_NONBLOCK, 0700); err != nil {
return nil, err
}
set = append(set, f)
cwg.Add(1)
wg.Add(1)
go func(w io.WriteCloser) {
cwg.Done()
io.Copy(w, ioset.in)
w.Close()
wg.Done()
}(f)
if f, err = fifo.OpenFifo(ctx, fifos.Out, syscall.O_RDONLY|syscall.O_CREAT|syscall.O_NONBLOCK, 0700); err != nil {
return nil, err
}
set = append(set, f)
wg.Add(1)
cwg.Add(1)
go func(r io.ReadCloser) {
cwg.Done()
io.Copy(ioset.out, r)
r.Close()
wg.Done()
}(f)
if f, err = fifo.OpenFifo(ctx, fifos.Err, syscall.O_RDONLY|syscall.O_CREAT|syscall.O_NONBLOCK, 0700); err != nil {
return nil, err
}
set = append(set, f)
if !tty {
wg.Add(1)
cwg.Add(1)
go func(r io.ReadCloser) {
cwg.Done()
io.Copy(ioset.err, r)
r.Close()
wg.Done()
}(f)
}
cwg.Wait()
return &wgCloser{
wg: wg,
dir: fifos.Dir,
set: set,
cancel: cancel,
}, nil
}