146 lines
3.3 KiB
Go
146 lines
3.3 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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"io"
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"sync"
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"github.com/containerd/containerd/cio"
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"github.com/containerd/containerd/log"
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cioutil "github.com/containerd/containerd/pkg/ioutil"
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)
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// ExecIO holds the exec io.
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type ExecIO struct {
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id string
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fifos *cio.FIFOSet
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*stdioPipes
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closer *wgCloser
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}
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var _ cio.IO = &ExecIO{}
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// NewExecIO creates exec io.
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func NewExecIO(id, root string, tty, stdin bool) (*ExecIO, error) {
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fifos, err := newFifos(root, id, tty, stdin)
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if err != nil {
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return nil, err
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}
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stdio, closer, err := newStdioPipes(fifos)
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if err != nil {
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return nil, err
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}
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return &ExecIO{
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id: id,
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fifos: fifos,
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stdioPipes: stdio,
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closer: closer,
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}, nil
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}
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// Config returns io config.
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func (e *ExecIO) Config() cio.Config {
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return e.fifos.Config
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}
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// Attach attaches exec stdio. The logic is similar with container io attach.
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func (e *ExecIO) Attach(opts AttachOptions) <-chan struct{} {
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var wg sync.WaitGroup
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var stdinStreamRC io.ReadCloser
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if e.stdin != nil && opts.Stdin != nil {
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stdinStreamRC = cioutil.NewWrapReadCloser(opts.Stdin)
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wg.Add(1)
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go func() {
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if _, err := io.Copy(e.stdin, stdinStreamRC); err != nil {
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log.L.WithError(err).Errorf("Failed to redirect stdin for container exec %q", e.id)
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}
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log.L.Infof("Container exec %q stdin closed", e.id)
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if opts.StdinOnce && !opts.Tty {
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e.stdin.Close()
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if err := opts.CloseStdin(); err != nil {
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log.L.WithError(err).Errorf("Failed to close stdin for container exec %q", e.id)
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}
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} else {
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if e.stdout != nil {
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e.stdout.Close()
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}
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if e.stderr != nil {
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e.stderr.Close()
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}
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}
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wg.Done()
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}()
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}
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attachOutput := func(t StreamType, stream io.WriteCloser, out io.ReadCloser) {
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if _, err := io.Copy(stream, out); err != nil {
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log.L.WithError(err).Errorf("Failed to pipe %q for container exec %q", t, e.id)
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}
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out.Close()
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stream.Close()
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if stdinStreamRC != nil {
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stdinStreamRC.Close()
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}
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e.closer.wg.Done()
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wg.Done()
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log.L.Debugf("Finish piping %q of container exec %q", t, e.id)
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}
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if opts.Stdout != nil {
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wg.Add(1)
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// Closer should wait for this routine to be over.
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e.closer.wg.Add(1)
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go attachOutput(Stdout, opts.Stdout, e.stdout)
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}
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if !opts.Tty && opts.Stderr != nil {
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wg.Add(1)
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// Closer should wait for this routine to be over.
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e.closer.wg.Add(1)
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go attachOutput(Stderr, opts.Stderr, e.stderr)
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}
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done := make(chan struct{})
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go func() {
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wg.Wait()
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close(done)
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}()
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return done
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}
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// Cancel cancels exec io.
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func (e *ExecIO) Cancel() {
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e.closer.Cancel()
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}
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// Wait waits exec io to finish.
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func (e *ExecIO) Wait() {
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e.closer.Wait()
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}
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// Close closes all FIFOs.
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func (e *ExecIO) Close() error {
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if e.closer != nil {
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e.closer.Close()
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}
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if e.fifos != nil {
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return e.fifos.Close()
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}
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return nil
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}
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