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<H1>[Mageia-dev] GRUB can't see HD from chroot unless parent /dev is bind-mounted in chroot ?</H1>
<B>Colin Guthrie</B>
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TITLE="[Mageia-dev] GRUB can't see HD from chroot unless parent /dev is bind-mounted in chroot ?">mageia at colin.guthr.ie
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<I>Wed Jan 16 17:24:50 CET 2013</I>
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<PRE>'Twas brillig, and Frank Griffin at 16/01/13 16:03 did gyre and gimble:
><i> I've been re-running /boot/grub/install.sh from within chroots for years
</I>><i> with no problem. But today when I tried doing this, I consistently got
</I>><i> Error 21: no such device. After googling a bit, I noticed that if I
</I>><i> started grub in the rescue system and did "grub> geometry (hd0)", I got
</I>><i> a correct response, but when I did the same thing from a chroot, it got
</I>><i> Error 21.
</I>><i>
</I>><i> If I bind-mount the rescue system's /dev to the chroot's /dev, it works
</I>><i> fine.
</I>><i>
</I>><i> This makes perfect sense, except for the fact that I've never had to do
</I>><i> it before. Any idea what changed ? This has the potential to screw up
</I>><i> a lot of folks who were used to the old way.
</I>><i>
</I>><i> Maybe /dev/sdX entries are no longer static, and so don't exist on the
</I>><i> root partition unless it is the booted system ?
</I>
It's quite possible that the lack of static nodes is what's messing
things up.
Personally I've been bind mounting /dev, /proc and /sys for years
whenever doing any rescuecd etc. stuff. Partly because I have several
LVM volumes where a static /dev/ wouldn't help anyway...
But bind mounting /dev has just been part of my chroot routine for as
long as I remember.
Col
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Colin Guthrie
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