I can't edit /etc/fstab from this Shell

[James J Catchpole <james_j_catchpole@xxxxxxxxx>]

I have had this problem before and it turned out
to be that even though FSTAB was on a R/W
File System that VI was also attempting
to write to the /TMP directory, which is
not writable, instead of the /mnt/sysimage/tmp
directory. I don't remember how I got around
it.

im

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----------------------------------------------------------------------

Message: 1
Date: Tue, 22 Apr 2008 09:12:13 -0400
From: Todd Denniston <Todd.Denniston@xxxxxxxxxxxxxxxxxx>
Subject: Re: F9: fsck gotcha on booting
To: For testers of Fedora Core development releases
	<fedora-test-list@xxxxxxxxxx>
Message-ID: <480DE42D.6000507@xxxxxxxxxxxxxxxxxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

Patrick O'Callaghan wrote, On 04/21/2008 11:35 PM:
  

On Mon, 2008-04-21 at 20:32 -0700, Andrew Farris wrote:
    

Patrick O'Callaghan wrote:
      

My fstab contains the line:

LABEL=/xtra             /xtra                   ext3    defaults        1 2

which worked fine on F8. Now with F9-Preview the boot process halts with
the following error (I'm working form memory here):

	Fsck: cannot resolve "LABEL=/xtra"

and drops me to a Shell to fix the problem. Two things:

1) From the Shell I can happily "mount /xtra" with no problems, so what
gives?

2) I can't edit /etc/fstab from this Shell. "mount" claims that the
system disk is mounted rw. but when I try to edit fstab "vi" tells me
it's read-only, and in fact "> foo" from the Shell gives the same error.
So I feel I have to ask why is the emergency Shell set up to not let me
edit anything?
        

Did you try editing then using w! to save it?  That may have worked.
      

Of course. It didn't. w! is fine if it's just a write-protected file.
This was a read-only filesystem.

poc

    

when in faulted file system mode, trust /proc/mounts instead of /etc/mtab 
(which is what mount returns data from).

a trick for when you need to write to these file systems:
mount -oremount,rw /mountpoint
i.e., for the root file system
mount-oremount,rw /

  

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