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Gentree
Watchman
Joined: 01 Jul 2003
Posts: 5350
Location: France, Old Europe
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 Posted: Thu Jul 07, 2005 4:02 pm Post subject: getting rooted by chroot |
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Very strange behaviour from chroot.
A few months back I started to set up a ~x86 system on a separte partition. I got it bootable but udev was not functional and I only got /dev/hda.... etc from mount
I dropped it for a while , in the mean time I changed my hard disks to one large one.
My main system has been migrated no probs from the old /dev/hdc .... to /dev/hda...
Stable for months full udev.
| Code: | bash-3.00#mount
/dev/hda5 on / type reiserfs (rw,noatime,notail)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
udev on /dev type tmpfs (rw,nosuid)
devpts on /dev/pts type devpts (rw)
/dev/hda8 on /suse type reiserfs (rw,notail)
/dev/hda3 on /boot type ext3 (rw,noatime)
/dev/hda11 on /wine type ext3 (rw)
/dev/hda12 on /home type ext3 (rw)
/dev/hda14 on /iso type reiserfs (rw,noatime)
/dev/hda15 on /tmpd type reiser4 (rw,noatime)
/dev/hda16 on /rar type ext3 (rw)
/dev/hda18 on /dvclone type reiserfs (rw,notail)
/dev/hda10 on /devsys type reiser4 (rw,noatime)
/dev/hda6 on /usr/portage type reiser4 (rw,noatime)
/usr/portage on /devsys/usr/portage type none (rw,bind)
none on /dev/shm type tmpfs (rw)
usbfs on /proc/bus/usb type usbfs (rw)
ls /dev/hd*
/dev/hda /dev/hda11 /dev/hda14 /dev/hda17 /dev/hda3 /dev/hda6 /dev/hda9
/dev/hda1 /dev/hda12 /dev/hda15 /dev/hda18 /dev/hda4 /dev/hda7 /dev/hdd
/dev/hda10 /dev/hda13 /dev/hda16 /dev/hda2 /dev/hda5 /dev/hda8
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Now I am rebulding /devsys using gcc4. OK most of it builds no probs.
Now if I chroot /devsys and do mount :
| Code: | bash-3.00#mount
/dev/hdc11 on / type reiser4 (rw,noatime)
proc on /proc type proc (rw,nodiratime)
sysfs on /sys type sysfs (rw)
udev on /dev type tmpfs (rw,nosuid)
devpts on /dev/pts type devpts (rw)
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Bullshit !
/dev/hdc does not even exist any more . It IDE and power cables are pulled out !
Now let's look at /devsys/etc/fstab
| Code: | bash-3.00#grep hdc /devsys/etc/fstab
#hdc13:
#hdc15:
#/dev/hdc3 /boot ext3 noatime 0 2
#hdc12:
#hdc10,5,6,7.8.9
#hdc14: |
So any ref to /dev/hdc is in the form of comments: there are no partitions set to dev/hdcx
now what IS defined and should be used on chroot.
| Code: |
bash-3.00#grep hda /devsys/etc/fstab
/dev/hda10 / reiser4 noatime 0 0
/dev/hda5 /newsys reiserfs
.... |
Now it seems to be dredging up some historical fstab from somewhere
/devsys/etc/conf.d/rc has RC_TARBALL="no"
Can anyone see what is evading me?
TIA Gentree. 
_________________
Linux, because I'd rather own a free OS than steal one that's not worth paying for.
Gentoo because I'm a masochist
AthlonXP-M on A7N8X. Portage ~x86 |
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Nil_Spaar
Apprentice
Joined: 10 Jul 2004
Posts: 179
Location: Berlin, Germany
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| Posted: Thu Jul 07, 2005 5:50 pm Post subject: |
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During the installation one has to copy some file from /proc to /etc/mtab. And before doing this mount shows strange stuff while chrooted.
It's a wild guess but could that be related? |
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GenTimJS
Guru
Joined: 03 May 2003
Posts: 406
Location: NH, USA
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| Posted: Thu Jul 07, 2005 7:27 pm Post subject: |
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not using any ide cable select sillyness i hope?
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-Tim Smith |
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widan
Veteran
Joined: 07 Jun 2005
Posts: 1512
Location: Paris, France
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| Posted: Thu Jul 07, 2005 7:41 pm Post subject: |
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| Nil_Spaar wrote: | During the installation one has to copy some file from /proc to /etc/mtab. And before doing this mount shows strange stuff while chrooted.
It's a wild guess but could that be related? |
It probably is...
| Code: | melanie ~ # echo "/dev/somedevice /mnt/somewhere gentoofs rw 0 0" >> /etc/mtab
melanie ~ # mount | grep gentoofs
/dev/somedevice on /mnt/somewhere type gentoofs (rw)
(remove the line)
melanie ~ # mount | grep gentoofs
melanie ~ # |
/devsys/etc/mtab is probably an old version, as mtab is updated only when (u)mount is run. And probably the last time it was updated was the last time you ran the ~x86 system (EDIT: not in a chroot). |
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Gentree
Watchman
Joined: 01 Jul 2003
Posts: 5350
Location: France, Old Europe
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| Posted: Fri Jul 08, 2005 6:08 am Post subject: |
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That was indeed the problem , a dead old bit if mtab lying around from when I last booted on the other disk. Significantly this was also messing up booting to that partition directly.
I though /etc/mtab got created clean on each boot , it appears not !
I may file a bug on this since I see no functional reason why stale info should be left in mtab
As you said , it seems it is only mount/umount that modifies it so it looks like the last shutdown on the old disk was not clean and left some entried in mtab.
I deleted the file rebooted directly and all is well now.
Thanks for your suggestions in clearing this up.
_________________
Linux, because I'd rather own a free OS than steal one that's not worth paying for.
Gentoo because I'm a masochist
AthlonXP-M on A7N8X. Portage ~x86 |
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