1917ca5f79
Add support for an 'env' field to the StreamProcessor configuration and append the environment variables found there to the os.Environ() array. The env field takes environment variables in the form of key=value. Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
148 lines
2.9 KiB
Go
148 lines
2.9 KiB
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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"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/gogo/protobuf/proto"
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"github.com/gogo/protobuf/types"
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"github.com/pkg/errors"
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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 *types.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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data, err := proto.Marshal(payload)
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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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}
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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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}
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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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}
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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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