129 lines
3.1 KiB
Go
129 lines
3.1 KiB
Go
// Copyright 2015 CNI authors
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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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"fmt"
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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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// For use in delegation; inherit the environment from this
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// process and allow overrides
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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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// Args implements the CNIArgs interface
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var _ CNIArgs = &Args{}
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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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// Duplicated values which come first will be overridden, so we must put the
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// custom values in the end to avoid being overridden by the process environments.
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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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)
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return dedupEnv(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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// DelegateArgs implements the CNIArgs interface
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// used for delegation to inherit from environments
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// and allow some overrides like CNI_COMMAND
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var _ CNIArgs = &DelegateArgs{}
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type DelegateArgs struct {
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Command string
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}
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func (d *DelegateArgs) AsEnv() []string {
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env := os.Environ()
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// The custom values should come in the end to override the existing
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// process environment of the same key.
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env = append(env,
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"CNI_COMMAND="+d.Command,
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)
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return dedupEnv(env)
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}
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// dedupEnv returns a copy of env with any duplicates removed, in favor of later values.
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// Items not of the normal environment "key=value" form are preserved unchanged.
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func dedupEnv(env []string) []string {
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out := make([]string, 0, len(env))
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envMap := map[string]string{}
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for _, kv := range env {
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// find the first "=" in environment, if not, just keep it
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eq := strings.Index(kv, "=")
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if eq < 0 {
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out = append(out, kv)
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continue
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}
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envMap[kv[:eq]] = kv[eq+1:]
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}
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for k, v := range envMap {
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out = append(out, fmt.Sprintf("%s=%s", k, v))
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}
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return out
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}
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