1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
|
/*
Copyright The containerd Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package main
import (
"context"
"flag"
"fmt"
"os"
"strings"
"github.com/containers/common/pkg/hooks"
rspec "github.com/opencontainers/runtime-spec/specs-go"
"github.com/sirupsen/logrus"
"sigs.k8s.io/yaml"
"github.com/containerd/nri/pkg/api"
"github.com/containerd/nri/pkg/stub"
)
var (
log *logrus.Logger
verbose bool
)
type plugin struct {
stub stub.Stub
mgr *hooks.Manager
}
func (p *plugin) CreateContainer(_ context.Context, pod *api.PodSandbox, container *api.Container) (*api.ContainerAdjustment, []*api.ContainerUpdate, error) {
ctrName := containerName(pod, container)
if verbose {
dump("CreateContainer", "pod", pod, "container", container)
}
annotations := map[string]string{}
for k, v := range container.Annotations {
annotations[k] = v
}
for k, v := range pod.Annotations {
annotations[k] = v
}
hasBindMounts := len(container.Mounts) > 0
spec := &rspec.Spec{
Process: &rspec.Process{
Args: container.Args,
},
}
if verbose {
dump(ctrName, "OCI Spec", spec)
dump(ctrName, "Annotations", annotations)
}
if _, err := p.mgr.Hooks(spec, annotations, hasBindMounts); err != nil {
log.Errorf("%s: failed to generate hooks: %v", ctrName, err)
return nil, nil, fmt.Errorf("hook generation failed: %w", err)
}
if spec.Hooks == nil {
log.Infof("%s: no hooks to inject, ignoring", ctrName)
return nil, nil, nil
}
adjust := &api.ContainerAdjustment{}
adjust.AddHooks(api.FromOCIHooks(spec.Hooks))
if verbose {
dump(ctrName, "ContainerAdjustment", adjust)
} else {
log.Infof("%s: OCI hooks injected", ctrName)
}
return adjust, nil, nil
}
// Construct a container name for log messages.
func containerName(pod *api.PodSandbox, container *api.Container) string {
if pod != nil {
return pod.Name + "/" + container.Name
}
return container.Name
}
// Dump one or more objects, with an optional global prefix and per-object tags.
func dump(args ...interface{}) {
var (
prefix string
idx int
)
if len(args)&0x1 == 1 {
prefix = args[0].(string)
idx++
}
for ; idx < len(args)-1; idx += 2 {
tag, obj := args[idx], args[idx+1]
msg, err := yaml.Marshal(obj)
if err != nil {
log.Infof("%s: %s: failed to dump object: %v", prefix, tag, err)
continue
}
if prefix != "" {
log.Infof("%s: %s:", prefix, tag)
for _, line := range strings.Split(strings.TrimSpace(string(msg)), "\n") {
log.Infof("%s: %s", prefix, line)
}
} else {
log.Infof("%s:", tag)
for _, line := range strings.Split(strings.TrimSpace(string(msg)), "\n") {
log.Infof(" %s", line)
}
}
}
}
func main() {
var (
pluginName string
pluginIdx string
disableWatch bool
opts []stub.Option
mgr *hooks.Manager
err error
)
log = logrus.StandardLogger()
log.SetFormatter(&logrus.TextFormatter{
PadLevelText: true,
})
flag.StringVar(&pluginName, "name", "", "plugin name to register to NRI")
flag.StringVar(&pluginIdx, "idx", "", "plugin index to register to NRI")
flag.BoolVar(&verbose, "verbose", false, "enable (more) verbose logging")
flag.BoolVar(&disableWatch, "disableWatch", false, "disable watching hook directories for new hooks")
flag.Parse()
if pluginName != "" {
opts = append(opts, stub.WithPluginName(pluginName))
}
if pluginIdx != "" {
opts = append(opts, stub.WithPluginIdx(pluginIdx))
}
p := &plugin{}
if p.stub, err = stub.New(p, opts...); err != nil {
log.Errorf("failed to create plugin stub: %v", err)
os.Exit(1)
}
ctx := context.Background()
dirs := []string{hooks.DefaultDir, hooks.OverrideDir}
mgr, err = hooks.New(ctx, dirs, []string{})
if err != nil {
log.Errorf("failed to set up hook manager: %v", err)
os.Exit(1)
}
p.mgr = mgr
if !disableWatch {
for _, dir := range dirs {
if err = os.MkdirAll(dir, 0755); err != nil {
log.Errorf("failed to create directory %q: %v", dir, err)
os.Exit(1)
}
}
sync := make(chan error, 2)
go mgr.Monitor(ctx, sync)
err = <-sync
if err != nil {
log.Errorf("failed to monitor hook directories: %v", err)
os.Exit(1)
}
log.Infof("watching directories %q for new changes", strings.Join(dirs, " "))
}
err = p.stub.Run(ctx)
if err != nil {
log.Errorf("plugin exited with error %v", err)
os.Exit(1)
}
}
|
