6f79600e73
last CNI library release is 0.7.1 from Jun 11, 2019. Since then, there was introduced new feature and bugfixes. Currently, this library is only being used by dockershim, the other CRI plugins are vendoring it directly However, this will help also to mitigate some of the issues with the CI jobs that are still using dockershim. Signed-off-by: Antonio Ojea <antonio.ojea.garcia@gmail.com>
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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