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
|
//go:build !windows
// +build !windows
package daemon // import "github.com/docker/docker/daemon"
import (
"bytes"
"context"
"fmt"
"os/exec"
"regexp"
"strconv"
"strings"
"github.com/docker/docker/api/types/container"
"github.com/docker/docker/errdefs"
libcontainerdtypes "github.com/docker/docker/libcontainerd/types"
"github.com/pkg/errors"
)
func validatePSArgs(psArgs string) error {
// NOTE: \\s does not detect unicode whitespaces.
// So we use fieldsASCII instead of strings.Fields in parsePSOutput.
// See https://github.com/docker/docker/pull/24358
//nolint: gosimple
re := regexp.MustCompile("\\s+([^\\s]*)=\\s*(PID[^\\s]*)")
for _, group := range re.FindAllStringSubmatch(psArgs, -1) {
if len(group) >= 3 {
k := group[1]
v := group[2]
if k != "pid" {
return fmt.Errorf("specifying \"%s=%s\" is not allowed", k, v)
}
}
}
return nil
}
// fieldsASCII is similar to strings.Fields but only allows ASCII whitespaces
func fieldsASCII(s string) []string {
fn := func(r rune) bool {
switch r {
case '\t', '\n', '\f', '\r', ' ':
return true
}
return false
}
return strings.FieldsFunc(s, fn)
}
func appendProcess2ProcList(procList *container.ContainerTopOKBody, fields []string) {
// Make sure number of fields equals number of header titles
// merging "overhanging" fields
process := fields[:len(procList.Titles)-1]
process = append(process, strings.Join(fields[len(procList.Titles)-1:], " "))
procList.Processes = append(procList.Processes, process)
}
func hasPid(procs []uint32, pid int) bool {
for _, p := range procs {
if int(p) == pid {
return true
}
}
return false
}
func parsePSOutput(output []byte, procs []uint32) (*container.ContainerTopOKBody, error) {
procList := &container.ContainerTopOKBody{}
lines := strings.Split(string(output), "\n")
procList.Titles = fieldsASCII(lines[0])
pidIndex := -1
for i, name := range procList.Titles {
if name == "PID" {
pidIndex = i
break
}
}
if pidIndex == -1 {
return nil, fmt.Errorf("Couldn't find PID field in ps output")
}
// loop through the output and extract the PID from each line
// fixing #30580, be able to display thread line also when "m" option used
// in "docker top" client command
preContainedPidFlag := false
for _, line := range lines[1:] {
if len(line) == 0 {
continue
}
fields := fieldsASCII(line)
var (
p int
err error
)
if fields[pidIndex] == "-" {
if preContainedPidFlag {
appendProcess2ProcList(procList, fields)
}
continue
}
p, err = strconv.Atoi(fields[pidIndex])
if err != nil {
return nil, fmt.Errorf("Unexpected pid '%s': %s", fields[pidIndex], err)
}
if hasPid(procs, p) {
preContainedPidFlag = true
appendProcess2ProcList(procList, fields)
continue
}
preContainedPidFlag = false
}
return procList, nil
}
// psPidsArg converts a slice of PIDs to a string consisting
// of comma-separated list of PIDs prepended by "-q".
// For example, psPidsArg([]uint32{1,2,3}) returns "-q1,2,3".
func psPidsArg(pids []uint32) string {
b := []byte{'-', 'q'}
for i, p := range pids {
b = strconv.AppendUint(b, uint64(p), 10)
if i < len(pids)-1 {
b = append(b, ',')
}
}
return string(b)
}
// ContainerTop lists the processes running inside of the given
// container by calling ps with the given args, or with the flags
// "-ef" if no args are given. An error is returned if the container
// is not found, or is not running, or if there are any problems
// running ps, or parsing the output.
func (daemon *Daemon) ContainerTop(name string, psArgs string) (*container.ContainerTopOKBody, error) {
if psArgs == "" {
psArgs = "-ef"
}
if err := validatePSArgs(psArgs); err != nil {
return nil, err
}
ctr, err := daemon.GetContainer(name)
if err != nil {
return nil, err
}
tsk, err := func() (libcontainerdtypes.Task, error) {
ctr.Lock()
defer ctr.Unlock()
tsk, err := ctr.GetRunningTask()
if err != nil {
return nil, err
}
if ctr.Restarting {
return nil, errContainerIsRestarting(ctr.ID)
}
return tsk, nil
}()
if err != nil {
return nil, err
}
infos, err := tsk.Pids(context.Background())
if err != nil {
return nil, err
}
procs := make([]uint32, len(infos))
for i, p := range infos {
procs[i] = p.Pid
}
args := strings.Split(psArgs, " ")
pids := psPidsArg(procs)
output, err := exec.Command("ps", append(args, pids)...).Output()
if err != nil {
// some ps options (such as f) can't be used together with q,
// so retry without it
output, err = exec.Command("ps", args...).Output()
if err != nil {
if ee, ok := err.(*exec.ExitError); ok {
// first line of stderr shows why ps failed
line := bytes.SplitN(ee.Stderr, []byte{'\n'}, 2)
if len(line) > 0 && len(line[0]) > 0 {
err = errors.New(string(line[0]))
}
}
return nil, errdefs.System(errors.Wrap(err, "ps"))
}
}
procList, err := parsePSOutput(output, procs)
if err != nil {
return nil, err
}
daemon.LogContainerEvent(ctr, "top")
return procList, nil
}
|
