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https://github.com/rancher/plugins.git
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b88f173c43
This takes some of the machinery from CNI and from the rkt networking code, and turns it into a library that can be linked into go apps. Included is an example command-line application that uses the library, called `cnitool`. Other headline changes: * Plugin exec'ing is factored out The motivation here is to factor out the protocol for invoking plugins. To that end, a generalisation of the code from api.go and pkg/plugin/ipam.go goes into pkg/invoke/exec.go. * Move argument-handling and conf-loading into public API The fact that the arguments get turned into an environment for the plugin is incidental to the API; so, provide a way of supplying them as a struct or saying "just use the same arguments as I got" (the latter is for IPAM plugins).
67 lines
1.7 KiB
Go
67 lines
1.7 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 ExecPlugin(pluginPath string, netconf []byte, args CNIArgs) (*types.Result, 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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res := &types.Result{}
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err := json.Unmarshal(stdout.Bytes(), res)
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return res, err
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}
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