mirror of https://github.com/minio/minio.git
48 lines
1.0 KiB
Go
48 lines
1.0 KiB
Go
package utils
|
|
|
|
import (
|
|
"bytes"
|
|
"errors"
|
|
"io"
|
|
"os/exec"
|
|
)
|
|
|
|
// A simple ExecPipe() pipes exec.Cmd together - somewhat similar to how bash pipes "|" behave.
|
|
// Each command's standard output is connected to the standard input of the next command
|
|
// and the output of the final command is returned
|
|
|
|
func ExecPipe(cmds ...*exec.Cmd) (pipeLineOutput io.Reader, pipeLineError error) {
|
|
// Require at least one command
|
|
if len(cmds) < 1 {
|
|
return nil, errors.New("Invalid argument")
|
|
}
|
|
|
|
// Collect the output from the command(s)
|
|
var output bytes.Buffer
|
|
|
|
lastIndex := len(cmds) - 1
|
|
for i, cmd := range cmds[:lastIndex] {
|
|
cmds[i+1].Stdin, _ = cmd.StdoutPipe()
|
|
}
|
|
|
|
// Final ---> output buffer
|
|
cmds[lastIndex].Stdout = &output
|
|
|
|
// Start each command
|
|
for _, cmd := range cmds {
|
|
if err := cmd.Start(); err != nil {
|
|
return &output, err
|
|
}
|
|
}
|
|
|
|
// We should Wait() for each command to complete
|
|
for _, cmd := range cmds {
|
|
if err := cmd.Wait(); err != nil {
|
|
return &output, err
|
|
}
|
|
}
|
|
|
|
// Return the output
|
|
return &output, nil
|
|
}
|