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Linux問題情報分享（2）：grub-install工具不能處理/dev/xvda*路徑
如果你的係統盤是/dev/xvda，而你又需要重新安裝grub，你可能會遇到這樣的問題
[root@demo ~]# fdisk -l -u
Disk /dev/xvda: 42.9 GB, 42949672960 bytes
255 heads, 63 sectors/track, 5221 cylinders, total 83886080 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00021c72
Device Boot Start End Blocks Id System
/dev/xvda1 * 2048 83886079 41942016 83 Linux
[root@demo ~]# grub-install /dev/xvda
expr: non-numeric argument
expr: non-numeric argument
The file /boot/grub/stage1 not read correctly.
[root@demo ~]#
造成這個問題原因是因為grub-install中有類似如下sed語句
[root@demo ~]# grep shv /sbin/grub-install
sed -e 's%\([shv]d[a-z]\)[0-9]*$%\1%' \
sed -e 's%.*/[shv]d[a-z]\([0-9]*\)$%\1%' \
[root@demo ~]#
這兩條sed是解析磁盤和分區路徑的。很明顯類似/dev/xvda這樣的路徑是處理不了的。
知道了原因，調整起來就簡單了
cp /sbin/grub-install /sbin/grub-install.orig
sed -i -e 's/\[shv\]/[shxv]\\{1,2\\}/' /sbin/grub-install
修改完畢，看看效果
[root@demo ~]# sed -i -e 's/\[shv\]/[shxv]\\{1,2\\}/' /sbin/grub-install
[root@demo ~]# grub-install /dev/xvda
Installation finished. No error reported.
This is the contents of the device map /boot/grub/device.map.
Check if this is correct or not. If any of the lines is incorrect,
fix it and re-run the script `grub-install'.
# this device map was generated by anaconda
(hd0) /dev/xvda
[root@demo ~]#
最後，記的恢複grub-install，以避免升級或者更新遇到麻煩
cat /sbin/grub-install.orig > /sbin/grub-install
最後更新：2017-07-27 09:03:11