165 lines
3.3 KiB
Go
165 lines
3.3 KiB
Go
//go:build !windows
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/*
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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 diff
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import (
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"bytes"
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"context"
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"errors"
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"fmt"
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"io"
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"os"
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"os/exec"
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"sync"
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"github.com/containerd/containerd/v2/pkg/protobuf/proto"
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"github.com/containerd/typeurl/v2"
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)
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// NewBinaryProcessor returns a binary processor for use with processing content streams
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func NewBinaryProcessor(ctx context.Context, imt, rmt string, stream StreamProcessor, name string, args, env []string, payload typeurl.Any) (StreamProcessor, error) {
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cmd := exec.CommandContext(ctx, name, args...)
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cmd.Env = os.Environ()
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cmd.Env = append(cmd.Env, env...)
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var payloadC io.Closer
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if payload != nil {
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pb := typeurl.MarshalProto(payload)
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data, err := proto.Marshal(pb)
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if err != nil {
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return nil, err
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}
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r, w, err := os.Pipe()
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if err != nil {
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return nil, err
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}
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go func() {
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io.Copy(w, bytes.NewReader(data))
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w.Close()
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}()
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cmd.ExtraFiles = append(cmd.ExtraFiles, r)
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payloadC = r
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}
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cmd.Env = append(cmd.Env, fmt.Sprintf("%s=%s", mediaTypeEnvVar, imt))
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var (
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stdin io.Reader
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closer func() error
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err error
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)
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if f, ok := stream.(RawProcessor); ok {
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stdin = f.File()
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closer = f.File().Close
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} else {
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stdin = stream
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}
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cmd.Stdin = stdin
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r, w, err := os.Pipe()
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if err != nil {
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return nil, err
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}
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cmd.Stdout = w
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stderr := bytes.NewBuffer(nil)
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cmd.Stderr = stderr
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if err := cmd.Start(); err != nil {
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return nil, err
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}
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p := &binaryProcessor{
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cmd: cmd,
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r: r,
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mt: rmt,
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stderr: stderr,
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done: make(chan struct{}),
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}
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go p.wait()
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// close after start and dup
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w.Close()
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if closer != nil {
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closer()
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}
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if payloadC != nil {
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payloadC.Close()
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}
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return p, nil
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}
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type binaryProcessor struct {
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cmd *exec.Cmd
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r *os.File
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mt string
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stderr *bytes.Buffer
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mu sync.Mutex
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err error
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// There is a race condition between waiting on c.cmd.Wait() and setting c.err within
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// c.wait(), and reading that value from c.Err().
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// Use done to wait for the returned error to be captured and set.
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done chan struct{}
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}
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func (c *binaryProcessor) Err() error {
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c.mu.Lock()
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defer c.mu.Unlock()
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return c.err
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}
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func (c *binaryProcessor) wait() {
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if err := c.cmd.Wait(); err != nil {
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if _, ok := err.(*exec.ExitError); ok {
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c.mu.Lock()
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c.err = errors.New(c.stderr.String())
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c.mu.Unlock()
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}
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}
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close(c.done)
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}
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func (c *binaryProcessor) Wait(ctx context.Context) error {
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select {
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case <-c.done:
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return c.Err()
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case <-ctx.Done():
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return ctx.Err()
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}
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}
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func (c *binaryProcessor) File() *os.File {
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return c.r
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}
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func (c *binaryProcessor) MediaType() string {
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return c.mt
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}
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func (c *binaryProcessor) Read(p []byte) (int, error) {
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return c.r.Read(p)
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}
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func (c *binaryProcessor) Close() error {
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err := c.r.Close()
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if kerr := c.cmd.Process.Kill(); err == nil {
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err = kerr
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}
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return err
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}
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