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
204
205
206
207
208
209
210
|
// Copyright 2019 The gVisor 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 cmd
import (
"context"
"encoding/json"
"fmt"
"io/ioutil"
"log"
"os"
"path"
"github.com/google/subcommands"
"gvisor.dev/gvisor/runsc/flag"
)
// Install implements subcommands.Command.
type Install struct {
ConfigFile string
Runtime string
Experimental bool
}
// Name implements subcommands.Command.Name.
func (*Install) Name() string {
return "install"
}
// Synopsis implements subcommands.Command.Synopsis.
func (*Install) Synopsis() string {
return "adds a runtime to docker daemon configuration"
}
// Usage implements subcommands.Command.Usage.
func (*Install) Usage() string {
return `install [flags] <name> [-- [args...]] -- if provided, args are passed to the runtime
`
}
// SetFlags implements subcommands.Command.SetFlags.
func (i *Install) SetFlags(fs *flag.FlagSet) {
fs.StringVar(&i.ConfigFile, "config_file", "/etc/docker/daemon.json", "path to Docker daemon config file")
fs.StringVar(&i.Runtime, "runtime", "runsc", "runtime name")
fs.BoolVar(&i.Experimental, "experimental", false, "enable experimental features")
}
// Execute implements subcommands.Command.Execute.
func (i *Install) Execute(_ context.Context, f *flag.FlagSet, _ ...interface{}) subcommands.ExitStatus {
// Grab the name and arguments.
runtimeArgs := f.Args()
// Extract the executable.
path, err := os.Executable()
if err != nil {
log.Fatalf("Error reading current exectuable: %v", err)
}
// Load the configuration file.
c, err := readConfig(i.ConfigFile)
if err != nil {
log.Fatalf("Error reading config file %q: %v", i.ConfigFile, err)
}
// Add the given runtime.
var rts map[string]interface{}
if i, ok := c["runtimes"]; ok {
rts = i.(map[string]interface{})
} else {
rts = make(map[string]interface{})
c["runtimes"] = rts
}
rts[i.Runtime] = struct {
Path string `json:"path,omitempty"`
RuntimeArgs []string `json:"runtimeArgs,omitempty"`
}{
Path: path,
RuntimeArgs: runtimeArgs,
}
// Set experimental if required.
if i.Experimental {
c["experimental"] = true
}
// Write out the runtime.
if err := writeConfig(c, i.ConfigFile); err != nil {
log.Fatalf("Error writing config file %q: %v", i.ConfigFile, err)
}
// Success.
log.Printf("Added runtime %q with arguments %v to %q.", i.Runtime, runtimeArgs, i.ConfigFile)
return subcommands.ExitSuccess
}
// Uninstall implements subcommands.Command.
type Uninstall struct {
ConfigFile string
Runtime string
}
// Name implements subcommands.Command.Name.
func (*Uninstall) Name() string {
return "uninstall"
}
// Synopsis implements subcommands.Command.Synopsis.
func (*Uninstall) Synopsis() string {
return "removes a runtime from docker daemon configuration"
}
// Usage implements subcommands.Command.Usage.
func (*Uninstall) Usage() string {
return `uninstall [flags] <name>
`
}
// SetFlags implements subcommands.Command.SetFlags.
func (u *Uninstall) SetFlags(fs *flag.FlagSet) {
fs.StringVar(&u.ConfigFile, "config_file", "/etc/docker/daemon.json", "path to Docker daemon config file")
fs.StringVar(&u.Runtime, "runtime", "runsc", "runtime name")
}
// Execute implements subcommands.Command.Execute.
func (u *Uninstall) Execute(context.Context, *flag.FlagSet, ...interface{}) subcommands.ExitStatus {
log.Printf("Removing runtime %q from %q.", u.Runtime, u.ConfigFile)
c, err := readConfig(u.ConfigFile)
if err != nil {
log.Fatalf("Error reading config file %q: %v", u.ConfigFile, err)
}
var rts map[string]interface{}
if i, ok := c["runtimes"]; ok {
rts = i.(map[string]interface{})
} else {
log.Fatalf("runtime %q not found", u.Runtime)
}
if _, ok := rts[u.Runtime]; !ok {
log.Fatalf("runtime %q not found", u.Runtime)
}
delete(rts, u.Runtime)
if err := writeConfig(c, u.ConfigFile); err != nil {
log.Fatalf("Error writing config file %q: %v", u.ConfigFile, err)
}
return subcommands.ExitSuccess
}
func readConfig(path string) (map[string]interface{}, error) {
// Read the configuration data.
configBytes, err := ioutil.ReadFile(path)
if err != nil && !os.IsNotExist(err) {
return nil, err
}
// Unmarshal the configuration.
c := make(map[string]interface{})
if len(configBytes) > 0 {
if err := json.Unmarshal(configBytes, &c); err != nil {
return nil, err
}
}
return c, nil
}
func writeConfig(c map[string]interface{}, filename string) error {
// Marshal the configuration.
b, err := json.MarshalIndent(c, "", " ")
if err != nil {
return err
}
// Copy the old configuration.
old, err := ioutil.ReadFile(filename)
if err != nil {
if !os.IsNotExist(err) {
return fmt.Errorf("error reading config file %q: %v", filename, err)
}
} else {
if err := ioutil.WriteFile(filename+"~", old, 0644); err != nil {
return fmt.Errorf("error backing up config file %q: %v", filename, err)
}
}
// Make the necessary directories.
if err := os.MkdirAll(path.Dir(filename), 0755); err != nil {
return fmt.Errorf("error creating config directory for %q: %v", filename, err)
}
// Write the new configuration.
if err := ioutil.WriteFile(filename, b, 0644); err != nil {
return fmt.Errorf("error writing config file %q: %v", filename, err)
}
return nil
}
|
