github.com/containerd/nerdctl@v1.7.7/pkg/consoleutil/consoleutil_unix.go (about)

     1  //go:build !windows
     2  
     3  /*
     4     Copyright The containerd Authors.
     5  
     6     Licensed under the Apache License, Version 2.0 (the "License");
     7     you may not use this file except in compliance with the License.
     8     You may obtain a copy of the License at
     9  
    10         http://www.apache.org/licenses/LICENSE-2.0
    11  
    12     Unless required by applicable law or agreed to in writing, software
    13     distributed under the License is distributed on an "AS IS" BASIS,
    14     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    15     See the License for the specific language governing permissions and
    16     limitations under the License.
    17  */
    18  
    19  package consoleutil
    20  
    21  import (
    22  	gocontext "context"
    23  	"os"
    24  	"os/signal"
    25  
    26  	"github.com/containerd/console"
    27  	"github.com/containerd/log"
    28  	"golang.org/x/sys/unix"
    29  )
    30  
    31  // HandleConsoleResize resizes the console.
    32  // From https://github.com/containerd/containerd/blob/v1.7.0-rc.2/cmd/ctr/commands/tasks/tasks_unix.go#L43-L68
    33  func HandleConsoleResize(ctx gocontext.Context, task resizer, con console.Console) error {
    34  	// do an initial resize of the console
    35  	size, err := con.Size()
    36  	if err != nil {
    37  		return err
    38  	}
    39  	if err := task.Resize(ctx, uint32(size.Width), uint32(size.Height)); err != nil {
    40  		log.G(ctx).WithError(err).Error("resize pty")
    41  	}
    42  	s := make(chan os.Signal, 16)
    43  	signal.Notify(s, unix.SIGWINCH)
    44  	go func() {
    45  		for range s {
    46  			size, err := con.Size()
    47  			if err != nil {
    48  				log.G(ctx).WithError(err).Error("get pty size")
    49  				continue
    50  			}
    51  			if err := task.Resize(ctx, uint32(size.Width), uint32(size.Height)); err != nil {
    52  				log.G(ctx).WithError(err).Error("resize pty")
    53  			}
    54  		}
    55  	}()
    56  	return nil
    57  }