[Mageia-dev] GRUB can't see HD from chroot unless parent /dev is bind-mounted in chroot ?

Wed Jan 16 22:17:46 CET 2013

'Twas brillig, and AL13N at 16/01/13 19:48 did gyre and gimble:
+> Op woensdag 16 januari 2013 11:30:27 schreef Liam R E Quin:
+>> On Wed, 2013-01-16 at 16:24 +0000, Colin Guthrie wrote:
+>>> 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.
+>>
+>> Knowing about this would have saved me several days after trying to
+>> install the mageia beta (I now have it running with the
+>> 3.6.5-tmb-desktop-3.mga3 kernel as the 3.8 one is broken without a fix
+>> to the recursive panic problem, which is fixed upstream). It's not
+>> obvious to people who don't do it often :-)
+>>
+>> Why not add a command to the rescue disk,
+>> bind-mount dir - mount /dev, /proc and /sys as /dir/dev etc for chroot
+>>
+>> Liam
+> 
+> because in fact, it's not really the correct solution (and there's multiple 
+> solutions for this too)
+> 
+> A) mount --bind solution (in fact, only /dev is required) ; mount /proc and 
+> /sys can be done inside.
+
+True. Tho' I've always favoured the bind mount for some unknown reason :)
+
+> B) in fact, udev people told us for a while now, you'd better just run udev 
+> inside the chroot, instead of mount --bind 'ing it.
+
+Really? I could swear Kay told me recently that it's only really
+sensible to run one udevd... Hmm, will ask him again when I see him
+online next.
+
+> C) of course, udev is not inside systemd, so it appears the new way is now to 
+> somehow spawn a systemd process inside the chroot (maybe systemd-nspawn?)
+
+Personally I think that's overkill.
+
+> oh well, rescuing is for advanced users, so i don't really see the need here. 
+> rescue should be as small as possible anyway.
+
+Indeedy :)
+
+Col
+
+
+-- 
+
+Colin Guthrie
+colin(at)mageia.org
+http://colin.guthr.ie/
+
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+  Tribalogic Limited http://www.tribalogic.net/
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+