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).
77 lines
1.7 KiB
Go
77 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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"os"
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"strings"
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)
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type CNIArgs interface {
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// For use with os/exec; i.e., return nil to inherit the
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// environment from this process
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AsEnv() []string
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}
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type inherited struct{}
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var inheritArgsFromEnv inherited
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func (_ *inherited) AsEnv() []string {
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return nil
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}
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func ArgsFromEnv() CNIArgs {
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return &inheritArgsFromEnv
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}
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type Args struct {
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Command string
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ContainerID string
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NetNS string
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PluginArgs [][2]string
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PluginArgsStr string
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IfName string
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Path string
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}
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func (args *Args) AsEnv() []string {
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env := os.Environ()
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pluginArgsStr := args.PluginArgsStr
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if pluginArgsStr == "" {
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pluginArgsStr = stringify(args.PluginArgs)
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}
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env = append(env,
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"CNI_COMMAND="+args.Command,
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"CNI_CONTAINERID="+args.ContainerID,
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"CNI_NETNS="+args.NetNS,
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"CNI_ARGS="+pluginArgsStr,
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"CNI_IFNAME="+args.IfName,
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"CNI_PATH="+args.Path)
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return env
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}
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// taken from rkt/networking/net_plugin.go
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func stringify(pluginArgs [][2]string) string {
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entries := make([]string, len(pluginArgs))
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for i, kv := range pluginArgs {
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entries[i] = strings.Join(kv[:], "=")
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}
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return strings.Join(entries, ";")
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}
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