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
|
package argv
import (
"errors"
"io"
"os"
"os/exec"
)
func Cmds(args ...[]string) ([]*exec.Cmd, error) {
var cmds []*exec.Cmd
for _, argv := range args {
if len(argv) == 0 {
return nil, errors.New("invalid cmd")
}
cmds = append(cmds, exec.Command(argv[0], argv[1:]...))
}
return cmds, nil
}
func Pipe(stdin io.Reader, stdout, stderr io.Writer, cmds ...*exec.Cmd) error {
if stdin == nil {
stdin = os.Stdin
}
if stdout == nil {
stdout = os.Stdout
}
if stderr == nil {
stderr = os.Stderr
}
l := len(cmds)
if l == 0 {
return nil
}
var err error
for i := 0; i < l; i++ {
if i == 0 {
cmds[i].Stdin = stdin
} else {
cmds[i].Stdin, err = cmds[i-1].StdoutPipe()
if stderr != nil {
break
}
}
cmds[i].Stderr = stderr
if i == l-1 {
cmds[i].Stdout = stdout
}
}
if err != nil {
return err
}
for i := range cmds {
err = cmds[i].Start()
if err != nil {
return err
}
}
for i := range cmds {
err = cmds[i].Wait()
if err != nil {
return err
}
}
return nil
}
|
