forked from thecodeteam/libstorage
/
s3fs_executor_linux.go
128 lines (115 loc) · 2.08 KB
/
s3fs_executor_linux.go
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
// +build linux
package executor
import (
"fmt"
"io/ioutil"
"os"
"path"
"regexp"
"runtime"
"strings"
"sync"
"github.com/codedellemc/libstorage/api/types"
)
func getMountedBuckets(
ctx types.Context,
s3fsBinName string) (map[string]string, error) {
s3fsBinRX := regexp.MustCompile(fmt.Sprintf(`^.*%s$`, s3fsBinName))
infc, errc, err := walkProc(ctx)
if err != nil {
return nil, err
}
var (
wg sync.WaitGroup
argc = make(chan []string)
numInspectors = runtime.NumCPU() + 1
)
wg.Add(numInspectors)
for i := 0; i < numInspectors; i++ {
go func() {
inspect(ctx, infc, argc)
wg.Done()
}()
}
go func() {
wg.Wait()
close(argc)
}()
m := map[string]string{}
for args := range argc {
if len(args) < 3 {
continue
}
if !s3fsBinRX.MatchString(args[0]) {
continue
}
m[args[1]] = args[2]
}
if err := <-errc; err != nil {
return nil, err
}
return m, nil
}
func walkProc(ctx types.Context) (<-chan os.FileInfo, <-chan error, error) {
proc, err := os.Open("/proc")
if err != nil {
return nil, nil, err
}
defer proc.Close()
infos, err := proc.Readdir(-1)
if err != nil {
return nil, nil, err
}
var (
infc = make(chan os.FileInfo)
errc = make(chan error, 1)
)
go func() {
defer close(infc)
errc <- func() error {
for _, i := range infos {
select {
case infc <- i:
case <-ctx.Done():
return ctx.Err()
}
}
return nil
}()
}()
return infc, errc, nil
}
var pidDirRX = regexp.MustCompile(`^\d+$`)
func inspect(
ctx types.Context,
infc <-chan os.FileInfo,
c chan<- []string) {
for i := range infc {
if !i.IsDir() {
continue
}
if !pidDirRX.MatchString(i.Name()) {
continue
}
func() {
cmdLineFile, err := os.Open(path.Join("/proc", i.Name(), "cmdline"))
if err != nil {
fmt.Fprintln(os.Stderr, err)
return
}
defer cmdLineFile.Close()
buf, err := ioutil.ReadAll(cmdLineFile)
if err != nil {
return
}
if len(buf) == 0 {
return
}
select {
case c <- strings.Split(string(buf), "\x00"):
case <-ctx.Done():
return
}
}()
}
}