github.com/mccv1r0/cni@v0.7.0-alpha1/pkg/invoke/raw_exec.go (about)

     1  // Copyright 2016 CNI authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package invoke
    16  
    17  import (
    18  	"bytes"
    19  	"encoding/json"
    20  	"fmt"
    21  	"io"
    22  	"os/exec"
    23  
    24  	"github.com/containernetworking/cni/pkg/types"
    25  )
    26  
    27  type RawExec struct {
    28  	Stderr io.Writer
    29  }
    30  
    31  func (e *RawExec) ExecPlugin(pluginPath string, stdinData []byte, environ []string) ([]byte, error) {
    32  	stdout := &bytes.Buffer{}
    33  
    34  	c := exec.Cmd{
    35  		Env:    environ,
    36  		Path:   pluginPath,
    37  		Args:   []string{pluginPath},
    38  		Stdin:  bytes.NewBuffer(stdinData),
    39  		Stdout: stdout,
    40  		Stderr: e.Stderr,
    41  	}
    42  	if err := c.Run(); err != nil {
    43  		return nil, pluginErr(err, stdout.Bytes())
    44  	}
    45  
    46  	return stdout.Bytes(), nil
    47  }
    48  
    49  func pluginErr(err error, output []byte) error {
    50  	if _, ok := err.(*exec.ExitError); ok {
    51  		emsg := types.Error{}
    52  		if perr := json.Unmarshal(output, &emsg); perr != nil {
    53  			emsg.Msg = fmt.Sprintf("netplugin failed but error parsing its diagnostic message %q: %v", string(output), perr)
    54  		}
    55  		return &emsg
    56  	}
    57  
    58  	return err
    59  }
    60  
    61  func (e *RawExec) FindInPath(plugin string, paths []string) (string, error) {
    62  	return FindInPath(plugin, paths)
    63  }