containerd/shim/io.go

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package shim
import (
"context"
"fmt"
"io"
"sync"
"syscall"
runc "github.com/crosbymichael/go-runc"
"github.com/tonistiigi/fifo"
)
func copyConsole(ctx context.Context, console *runc.Console, stdin, stdout, stderr string, wg *sync.WaitGroup) error {
in, err := fifo.OpenFifo(ctx, stdin, syscall.O_RDONLY, 0)
if err != nil {
return err
}
go io.Copy(console, in)
outw, err := fifo.OpenFifo(ctx, stdout, syscall.O_WRONLY, 0)
if err != nil {
return err
}
outr, err := fifo.OpenFifo(ctx, stdout, syscall.O_RDONLY, 0)
if err != nil {
return err
}
wg.Add(1)
go func() {
io.Copy(outw, console)
console.Close()
outr.Close()
outw.Close()
wg.Done()
}()
return nil
}
func copyPipes(ctx context.Context, rio runc.IO, stdin, stdout, stderr string, wg *sync.WaitGroup) error {
for name, dest := range map[string]func(wc io.WriteCloser, rc io.Closer){
stdout: func(wc io.WriteCloser, rc io.Closer) {
wg.Add(1)
go func() {
io.Copy(wc, rio.Stdout())
wg.Done()
wc.Close()
rc.Close()
}()
},
stderr: func(wc io.WriteCloser, rc io.Closer) {
wg.Add(1)
go func() {
io.Copy(wc, rio.Stderr())
wg.Done()
wc.Close()
rc.Close()
}()
},
} {
fw, err := fifo.OpenFifo(ctx, name, syscall.O_WRONLY, 0)
if err != nil {
return fmt.Errorf("containerd-shim: opening %s failed: %s", name, err)
}
fr, err := fifo.OpenFifo(ctx, name, syscall.O_RDONLY, 0)
if err != nil {
return fmt.Errorf("containerd-shim: opening %s failed: %s", name, err)
}
dest(fw, fr)
}
f, err := fifo.OpenFifo(ctx, stdin, syscall.O_RDONLY, 0)
if err != nil {
return fmt.Errorf("containerd-shim: opening %s failed: %s", stdin, err)
}
go func() {
io.Copy(rio.Stdin(), f)
rio.Stdin().Close()
f.Close()
}()
return nil
}