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util.go
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util.go
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package main
import (
"errors"
"fmt"
"os"
"os/exec"
"time"
)
func getFilesystemType(dev string) (string, error) {
out, err := exec.Command("blkid", "-s", "TYPE", "-o", "value", dev).CombinedOutput()
if err != nil {
if len(out) == 0 {
return "", nil
}
return "", errors.New(string(out))
}
return string(out), nil
}
func formatFilesystem(dev string, label string) error {
out, err := exec.Command("mkfs.ext4", "-L", label, dev).CombinedOutput()
if err != nil {
return errors.New(string(out))
}
return nil
}
func waitForDevice(dev string) error {
_, err := os.Stat(dev)
if err != nil {
if !os.IsNotExist(err) {
return err
}
} else {
return nil
}
for i := 1; i <= 10; i++ {
time.Sleep(500 * time.Millisecond)
if _, err = os.Stat(dev); err != nil {
if !os.IsNotExist(err) {
return err
}
} else {
return nil
}
}
return fmt.Errorf("Timeout waiting for file: %s", dev)
}
func isDirectoryPresent(path string) (bool, error) {
stat, err := os.Stat(path)
if os.IsNotExist(err) {
return false, nil
} else if err != nil {
return false, err
} else {
return stat.IsDir(), nil
}
}