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pavelara
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Joined: 31 Jan 2010
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PostPosted: Sun Jan 31, 2010 3:00 pm    Post subject: df: cannot read table of mounted filesystems Reply with quote

I'm installing gentoo following the instructions in the handbook. After chrooting the output of the df command is

Code:
df: cannot read table of mounted filesystems: No such file or directory


This doesn't cause any troubles when I compile the kernel and so on, but at the end of the installation grub fails to install and displays the same output:

Code:
df: cannot read table of mounted filesystems: No such file or directory


As consequence, I can't boot my gentoo system. This happens on my desktop PC. The same on vmware. It's necessary to add that I successfully installed Gentoo several times. The fact is that I don't remember what version of stage 3 tarball I used then. Now I'm using the installation CD ant the stage 3 tarball of 20100126.

Any ideas? thx
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Mike Hunt
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PostPosted: Sun Jan 31, 2010 3:36 pm    Post subject: Reply with quote

Maybe you forgot to mount /proc before chrooting ?
Code:
livecd / # mount -t proc proc /mnt/gentoo/proc
livecd / # mount -o bind /dev /mnt/gentoo/dev
livecd / # cp -L /etc/resolv.conf /mnt/gentoo/etc/
livecd / # chroot /mnt/gentoo /bin/bash
livecd / # env-update && source /etc/profile


It is possible that the installCD you are using is defective.
The SystemRescueCd will also work.
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pavelara
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PostPosted: Sun Jan 31, 2010 4:01 pm    Post subject: Reply with quote

Mike Hunt wrote:
Maybe you forgot to mount /proc before chrooting ?
Code:
livecd / # mount -t proc proc /mnt/gentoo/proc
livecd / # mount -o bind /dev /mnt/gentoo/dev
livecd / # cp -L /etc/resolv.conf /mnt/gentoo/etc/
livecd / # chroot /mnt/gentoo /bin/bash
livecd / # env-update && source /etc/profile

I did exactly like you described.

Quote:
It is possible that the installCD you are using is defective.
The SystemRescueCd will also work.

I doubt it, I'm using an ISO image mounted at vmware. md5 checksum is correct. But I'll try the CD that you advised.
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NeddySeagoon
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PostPosted: Sun Jan 31, 2010 4:05 pm    Post subject: Reply with quote

pavelara,

Welcome to Gentoo.

Code:
df: cannot read table of mounted filesystems: No such file or directory
Is correct inside the chroot.
The command tries to read /etc/mtab, which is updated by mount as filesystems are mounted and unmounted, but its outside the chroot.

/proc/mounts contains the same information, so you can copy /proc/mounts to /etc/mtab then df works

If you install grub manually - not using grub install, then /etc/mtab is not consulted.
The manual install is documented in the handbook
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those that do backups
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pavelara
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PostPosted: Sun Jan 31, 2010 5:57 pm    Post subject: Reply with quote

NeddySeagoon, thank you very much, it helped:
Code:
# grep -v rootfs /proc/mounts > /etc/mtab

Then I installed grub without any problems.
And excuse me, I could have read the handbook with more attention. :)
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Mike Hunt
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PostPosted: Sun Jan 31, 2010 6:42 pm    Post subject: Reply with quote

That's a good one to remember. :)
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Maffblaster
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Joined: 01 May 2007
Posts: 65
Location: Spokane, Washington, USA

PostPosted: Thu Mar 03, 2016 1:19 am    Post subject: Reply with quote

Quote:
/proc/mounts contains the same information, so you can copy /proc/mounts to /etc/mtab then df works


I'll scan the handbook to see is this is still mentioned, but very help and good information, Neddy! I wrote a little entry on my blog because I learned how to resolve this issue today: http://maffblaster.github.io/2016/03/02/today-i-learned-mtab.html
Probably would be even better to symlink /proc/mounts to /etc/mtab:

Code:
ln -s /proc/mounts /etc/mtab


This way when /proc/mounts change, /etc/mtab changes along with it. :)
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krinn
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PostPosted: Thu Mar 03, 2016 8:08 am    Post subject: Reply with quote

It's not like openrc isn't telling you about it. https://560060.bugs.gentoo.org/attachment.cgi?id=414008


Make sure you also have set the use flag "libmount" with nfs-utils and update it with it or you'll be in trouble with nfs share.
With libmount nfs-utils will copy (to /run/mount) needed infos that are missing in /proc/self/mounts to handle user (remounting will fail, user will not be able to unmount...).

Everyone suggest to symlink with /proc/self/mounts, /proc/mounts is another symlink to it if you check it.
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