ae3ceedd69
When plugin is executed with a DEL command, it does not print result to stdout unless there is an error. Therefore it stdout bytes should not be passed to json.Unmarshal.
81 lines
2.0 KiB
Go
81 lines
2.0 KiB
Go
// Copyright 2015 CoreOS, Inc.
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package invoke
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"os"
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"os/exec"
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"path/filepath"
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"github.com/appc/cni/pkg/types"
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)
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func pluginErr(err error, output []byte) error {
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if _, ok := err.(*exec.ExitError); ok {
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emsg := types.Error{}
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if perr := json.Unmarshal(output, &emsg); perr != nil {
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return fmt.Errorf("netplugin failed but error parsing its diagnostic message %q: %v", string(output), perr)
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}
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details := ""
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if emsg.Details != "" {
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details = fmt.Sprintf("; %v", emsg.Details)
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}
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return fmt.Errorf("%v%v", emsg.Msg, details)
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}
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return err
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}
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func ExecPluginWithResult(pluginPath string, netconf []byte, args CNIArgs) (*types.Result, error) {
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stdoutBytes, err := execPlugin(pluginPath, netconf, args)
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if err != nil {
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return nil, err
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}
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res := &types.Result{}
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err = json.Unmarshal(stdoutBytes, res)
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return res, err
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}
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func ExecPluginWithoutResult(pluginPath string, netconf []byte, args CNIArgs) error {
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_, err := execPlugin(pluginPath, netconf, args)
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return err
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}
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func execPlugin(pluginPath string, netconf []byte, args CNIArgs) ([]byte, error) {
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if pluginPath == "" {
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return nil, fmt.Errorf("could not find %q plugin", filepath.Base(pluginPath))
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}
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stdout := &bytes.Buffer{}
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c := exec.Cmd{
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Env: args.AsEnv(),
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Path: pluginPath,
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Args: []string{pluginPath},
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Stdin: bytes.NewBuffer(netconf),
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Stdout: stdout,
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Stderr: os.Stderr,
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}
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if err := c.Run(); err != nil {
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return nil, pluginErr(err, stdout.Bytes())
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}
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return stdout.Bytes(), nil
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}
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