145 lines
3.1 KiB
Go
145 lines
3.1 KiB
Go
/*
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Copyright The containerd Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package io
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import (
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"context"
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"io"
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"os"
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"path/filepath"
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"sync"
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"syscall"
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"github.com/containerd/containerd/cio"
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runtime "k8s.io/cri-api/pkg/apis/runtime/v1"
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)
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// AttachOptions specifies how to attach to a container.
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type AttachOptions struct {
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Stdin io.Reader
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Stdout io.WriteCloser
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Stderr io.WriteCloser
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Tty bool
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StdinOnce bool
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// CloseStdin is the function to close container stdin.
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CloseStdin func() error
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}
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// StreamType is the type of the stream, stdout/stderr.
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type StreamType string
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const (
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// Stdin stream type.
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Stdin StreamType = "stdin"
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// Stdout stream type.
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Stdout = StreamType(runtime.Stdout)
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// Stderr stream type.
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Stderr = StreamType(runtime.Stderr)
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)
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type wgCloser struct {
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ctx context.Context
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wg *sync.WaitGroup
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set []io.Closer
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cancel context.CancelFunc
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}
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func (g *wgCloser) Wait() {
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g.wg.Wait()
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}
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func (g *wgCloser) Close() {
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for _, f := range g.set {
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f.Close()
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}
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}
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func (g *wgCloser) Cancel() {
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g.cancel()
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}
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// newFifos creates fifos directory for a container.
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func newFifos(root, id string, tty, stdin bool) (*cio.FIFOSet, error) {
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root = filepath.Join(root, "io")
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if err := os.MkdirAll(root, 0700); err != nil {
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return nil, err
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}
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fifos, err := cio.NewFIFOSetInDir(root, id, tty)
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if err != nil {
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return nil, err
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}
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if !stdin {
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fifos.Stdin = ""
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}
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return fifos, nil
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}
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type stdioPipes struct {
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stdin io.WriteCloser
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stdout io.ReadCloser
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stderr io.ReadCloser
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}
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// newStdioPipes creates actual fifos for stdio.
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func newStdioPipes(fifos *cio.FIFOSet) (_ *stdioPipes, _ *wgCloser, err error) {
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var (
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f io.ReadWriteCloser
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set []io.Closer
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ctx, cancel = context.WithCancel(context.Background())
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p = &stdioPipes{}
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)
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defer func() {
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if err != nil {
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for _, f := range set {
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f.Close()
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}
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cancel()
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}
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}()
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if fifos.Stdin != "" {
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if f, err = openPipe(ctx, fifos.Stdin, syscall.O_WRONLY|syscall.O_CREAT|syscall.O_NONBLOCK, 0700); err != nil {
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return nil, nil, err
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}
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p.stdin = f
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set = append(set, f)
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}
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if fifos.Stdout != "" {
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if f, err = openPipe(ctx, fifos.Stdout, syscall.O_RDONLY|syscall.O_CREAT|syscall.O_NONBLOCK, 0700); err != nil {
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return nil, nil, err
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}
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p.stdout = f
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set = append(set, f)
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}
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if fifos.Stderr != "" {
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if f, err = openPipe(ctx, fifos.Stderr, syscall.O_RDONLY|syscall.O_CREAT|syscall.O_NONBLOCK, 0700); err != nil {
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return nil, nil, err
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}
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p.stderr = f
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set = append(set, f)
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}
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return p, &wgCloser{
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wg: &sync.WaitGroup{},
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set: set,
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ctx: ctx,
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cancel: cancel,
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}, nil
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}
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