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
|
/*
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 tasks
import (
"errors"
"io"
"net/url"
"os"
"github.com/containerd/console"
"github.com/containerd/containerd"
"github.com/containerd/containerd/cio"
"github.com/containerd/containerd/cmd/ctr/commands"
"github.com/sirupsen/logrus"
"github.com/urfave/cli"
)
//TODO:(jessvalarezo) exec-id is optional here, update to required arg
var execCommand = cli.Command{
Name: "exec",
Usage: "execute additional processes in an existing container",
ArgsUsage: "[flags] CONTAINER CMD [ARG...]",
SkipArgReorder: true,
Flags: []cli.Flag{
cli.StringFlag{
Name: "cwd",
Usage: "working directory of the new process",
},
cli.BoolFlag{
Name: "tty,t",
Usage: "allocate a TTY for the container",
},
cli.BoolFlag{
Name: "detach,d",
Usage: "detach from the task after it has started execution",
},
cli.StringFlag{
Name: "exec-id",
Usage: "exec specific id for the process",
},
cli.StringFlag{
Name: "fifo-dir",
Usage: "directory used for storing IO FIFOs",
},
cli.StringFlag{
Name: "log-uri",
Usage: "log uri for custom shim logging",
},
},
Action: func(context *cli.Context) error {
var (
id = context.Args().First()
args = context.Args().Tail()
tty = context.Bool("tty")
detach = context.Bool("detach")
)
if id == "" {
return errors.New("container id must be provided")
}
client, ctx, cancel, err := commands.NewClient(context)
if err != nil {
return err
}
defer cancel()
container, err := client.LoadContainer(ctx, id)
if err != nil {
return err
}
spec, err := container.Spec(ctx)
if err != nil {
return err
}
task, err := container.Task(ctx, nil)
if err != nil {
return err
}
pspec := spec.Process
pspec.Terminal = tty
pspec.Args = args
var (
ioCreator cio.Creator
stdinC = &stdinCloser{
stdin: os.Stdin,
}
)
if logURI := context.String("log-uri"); logURI != "" {
uri, err := url.Parse(logURI)
if err != nil {
return err
}
if dir := context.String("fifo-dir"); dir != "" {
return errors.New("can't use log-uri with fifo-dir")
}
if tty {
return errors.New("can't use log-uri with tty")
}
ioCreator = cio.LogURI(uri)
} else {
cioOpts := []cio.Opt{cio.WithStreams(stdinC, os.Stdout, os.Stderr), cio.WithFIFODir(context.String("fifo-dir"))}
if tty {
cioOpts = append(cioOpts, cio.WithTerminal)
}
ioCreator = cio.NewCreator(cioOpts...)
}
process, err := task.Exec(ctx, context.String("exec-id"), pspec, ioCreator)
if err != nil {
return err
}
stdinC.closer = func() {
process.CloseIO(ctx, containerd.WithStdinCloser)
}
// if detach, we should not call this defer
if !detach {
defer process.Delete(ctx)
}
statusC, err := process.Wait(ctx)
if err != nil {
return err
}
var con console.Console
if tty {
con = console.Current()
defer con.Reset()
if err := con.SetRaw(); err != nil {
return err
}
}
if !detach {
if tty {
if err := HandleConsoleResize(ctx, process, con); err != nil {
logrus.WithError(err).Error("console resize")
}
} else {
sigc := commands.ForwardAllSignals(ctx, process)
defer commands.StopCatch(sigc)
}
}
if err := process.Start(ctx); err != nil {
return err
}
if detach {
return nil
}
status := <-statusC
code, _, err := status.Result()
if err != nil {
return err
}
if code != 0 {
return cli.NewExitError("", int(code))
}
return nil
},
}
type stdinCloser struct {
stdin *os.File
closer func()
}
func (s *stdinCloser) Read(p []byte) (int, error) {
n, err := s.stdin.Read(p)
if err == io.EOF {
if s.closer != nil {
s.closer()
}
}
return n, err
}
|
