如何使用parted编写自动任务脚本（更新gpt表）

Question

我想编写 Debian 9.9 上现有分区扩展的脚本。

我可以简单地使用parted的交互模式来完成它，但我想自动化它。在下面的示例中，我只需要手动编写“修复”，但我想编写脚本。

root@localhost:~# parted -l
Model: Linux device-mapper (linear) (dm)
Disk /dev/mapper/backup: 38.9GB
Sector size (logical/physical): 512B/512B
Partition Table: loop
Disk Flags: 

Number  Start  End     Size    File system  Flags
 1      0.00B  38.9GB  38.9GB  xfs


Model: Linux device-mapper (linear) (dm)
Disk /dev/mapper/data: 38.9GB
Sector size (logical/physical): 512B/512B
Partition Table: loop
Disk Flags: 

Number  Start  End     Size    File system  Flags
 1      0.00B  38.9GB  38.9GB  xfs


Warning: Not all of the space available to /dev/vda appears to be used, you can
fix the GPT to use all of the space (an extra 20971520 blocks) or continue with
the current setting? 
Fix/Ignore?                    

我想知道当我输入“Fix”时执行哪个命令。据我了解，这可能只是 GPT 表的重新加载，所以我尝试执行命令partprobe：

root@localhost:~# partprobe 
Warning: Not all of the space available to /dev/vda appears to be used, you can fix the GPT to use all of the space (an extra 20971520 blocks) or continue with the current setting? 
root@localhost:~# 

但这里没有提出任何选择。我查看了parted的帮助，有一个“脚本模式”，我尝试了以下方法，但没有用：

root@localhost:~# parted -s /dev/vda print Fix
Warning: Not all of the space available to /dev/vda appears to be used, you can fix the GPT to use all of the space (an extra 20971520 blocks) or continue with the current setting? 
Model: Virtio Block Device (virtblk)
Disk /dev/vda: 118GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags: 

Number  Start   End     Size    File system  Name  Flags
 1      17.4kB  1018kB  1000kB                     bios_grub
 2      1018kB  451MB   450MB   ext3
 3      451MB   10.5GB  10.0GB  xfs
 8      29.6GB  107GB   77.8GB

Usage: parted [OPTION]... [DEVICE [COMMAND [PARAMETERS]...]...]
Apply COMMANDs with PARAMETERS to DEVICE.  If no COMMAND(s) are given, run in
interactive mode.

OPTIONs:
  -h, --help                      displays this help message
  -l, --list                      lists partition layout on all block devices
  -m, --machine                   displays machine parseable output
  -s, --script                    never prompts for user intervention
  -v, --version                   displays the version
  -a, --align=[none|cyl|min|opt]  alignment for new partitions

COMMANDs:
  align-check TYPE N                        check partition N for TYPE(min|opt) alignment
  help [COMMAND]                           print general help, or help on COMMAND
[...]

我也尝试过这个bash脚本：

#!/bin/bash
(echo Fix; echo print list; echo quit) | parted /dev/vda print free

但它没有用，我也尝试过这个，但它没有帮助：

**root@localhost:~# cat /tmp/2.sh** 

select /dev/vda
print 
Fix

然后将其通过管道输入到parted中：

parted < /tmp/2.sh

Answer 1

printf "fix\n" | parted ---pretend-input-tty /dev/vda print

Answer 2

我找到了一个解决方案，使用

sgdisk

代替

parted

，看起来编写脚本方便多了。就我而言，

sgdisk /dev/vda -e

成功了

Answer 3

我用了这个脚本

        rm -f /tmp/parted_info
        parted --script /dev/$block_device p 2>&1 | tee -a /tmp/parted_info
        # gpt warning
        if grep -Eq 'fix the GPT' /tmp/parted_info;then
            echo -e "OK\nFix\n" | parted ---pretend-input-tty /dev/$block_device print 1>/dev/null
            rm -f /tmp/parted_info
        fi