Function createPartition

pkg/extend/extend.go:187–229

(d string, partition Partition)

}

func createPartition(d string, partition Partition) error {
	if err := exec.Command("sfdisk", "-q", "--delete", d).Run(); err != nil {
		return fmt.Errorf("Error erasing partition table: %v", err.Error())
	}

	createCmd := exec.Command("sfdisk", "-q", d)
	createCmd.Stdin = strings.NewReader(fmt.Sprintf("%d,,%s;", partition.Start, partition.Type))
	if err := createCmd.Run(); err != nil {
		return fmt.Errorf("Error creating partition table: %v", err)
	}

	if err := exec.Command("sfdisk", "-A", d, "1").Run(); err != nil {
		return fmt.Errorf("Error making %s bootable: %v", d, err)
	}

	// update status
	if err := rereadPartitions(d); err != nil {
		return fmt.Errorf("Error re-reading partition using ioctl: %v", err)
	}

	exec.Command("mdev", "-s").Run()

	// wait for device
	var done bool
	for i := 0; i < timeout; i++ {
		stat, err := os.Stat(partition.Node)
		if err == nil {
			mode := stat.Sys().(*syscall.Stat_t).Mode
			if (mode & syscall.S_IFMT) == syscall.S_IFBLK {
				done = true
				break
			}
		}
		time.Sleep(100 * time.Millisecond)
		exec.Command("mdev", "-s").Run()
	}
	if !done {
		return fmt.Errorf("Error waiting for device %s", partition.Node)
	}
	// even after the device appears we still have a race
	time.Sleep(1 * time.Second)
	return nil
}

func deviceSize(device string) (int64, error) {
	file, err := os.Open(device)