containerd/cmd/ctr/utils_unix.go

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// +build !windows
package main
import (
"fmt"
"io"
"io/ioutil"
"log"
"net"
"os"
"sync"
"syscall"
"time"
gocontext "context"
"github.com/pkg/errors"
"github.com/tonistiigi/fifo"
"github.com/urfave/cli"
"google.golang.org/grpc"
"google.golang.org/grpc/grpclog"
)
func prepareStdio(stdin, stdout, stderr string, console bool) (*sync.WaitGroup, error) {
var wg sync.WaitGroup
ctx := gocontext.Background()
f, err := fifo.OpenFifo(ctx, stdin, syscall.O_WRONLY|syscall.O_CREAT|syscall.O_NONBLOCK, 0700)
if err != nil {
return nil, err
}
defer func(c io.Closer) {
if err != nil {
c.Close()
}
}(f)
go func(w io.WriteCloser) {
io.Copy(w, os.Stdin)
w.Close()
}(f)
f, err = fifo.OpenFifo(ctx, stdout, syscall.O_RDONLY|syscall.O_CREAT|syscall.O_NONBLOCK, 0700)
if err != nil {
return nil, err
}
defer func(c io.Closer) {
if err != nil {
c.Close()
}
}(f)
wg.Add(1)
go func(r io.ReadCloser) {
io.Copy(os.Stdout, r)
r.Close()
wg.Done()
}(f)
f, err = fifo.OpenFifo(ctx, stderr, syscall.O_RDONLY|syscall.O_CREAT|syscall.O_NONBLOCK, 0700)
if err != nil {
return nil, err
}
defer func(c io.Closer) {
if err != nil {
c.Close()
}
}(f)
if !console {
wg.Add(1)
go func(r io.ReadCloser) {
io.Copy(os.Stderr, r)
r.Close()
wg.Done()
}(f)
}
return &wg, nil
}
func getGRPCConnection(context *cli.Context) (*grpc.ClientConn, error) {
if grpcConn != nil {
return grpcConn, nil
}
bindSocket := context.GlobalString("address")
// reset the logger for grpc to log to dev/null so that it does not mess with our stdio
grpclog.SetLogger(log.New(ioutil.Discard, "", log.LstdFlags))
dialOpts := []grpc.DialOption{grpc.WithInsecure(), grpc.WithTimeout(100 * time.Second)}
dialOpts = append(dialOpts,
grpc.WithDialer(func(addr string, timeout time.Duration) (net.Conn, error) {
return net.DialTimeout("unix", bindSocket, timeout)
},
))
conn, err := grpc.Dial(fmt.Sprintf("unix://%s", bindSocket), dialOpts...)
if err != nil {
return nil, errors.Wrapf(err, "failed to dial %q", bindSocket)
}
grpcConn = conn
return grpcConn, nil
}