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Automatically enter root password when FSCK fails

Posted on 2006-06-28
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Last Modified: 2008-01-09
Does anyone know how to automatically enter the root password when FSCK fails @ the following prompt?  I want it to automatically enter the root password or bypass this to bring me to the shell automatically.  Woudl I have to edit any of the rc start-up scripts?  Thanks for any help.


enter root password or <CTRL> D
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Question by:techie411
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Expert Comment

by:pjedmond
ID: 17004651
I presume that this is during startup?

There is a good reason for asking for the root prompt, as you have access to the whole file system. In order to avoid this, you need to make the system boot into single mode *unless* you fancy patching the code? Assuming that this was during startup, then someone else may come up with a way of doing this automatically, but at the moment I'm afraid I can't think of any 'obvious' solution.
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Duncan Roe earned 672 total points
ID: 17005366
You may be able to find that text ("enter root password ...") in the rc script that runs fsck; or you may find an invocation of sulogin. My copy of sulogin prompts as follows:
Type control-d to proceed with normal startup,
(or give root password for system maintenance):

is that the message you see?
If so, ypu could replace sulogin with bash in the script: that will give you a root shell prompt and no password asked for.
Otherwise, you should find the commands that generate the prompt in the fsck-runnung script (grep for fsck in your rc script directory) - they will be invoked in the case of a serious failure. Again, replace with a simple invocation of bash.
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by:pjedmond
pjedmond earned 664 total points
ID: 17007249
OK - Found it - on a Redhat system it's in:

/etc/rc.d/rc.sysinit

search for sulogin and comment out ot replace as appropriate.


Thanks to duncan_roe for the inspiration:

find /etc | awk {'print "echo " $0";cat " $0 " | grep sulogin"'} | /bin/bash > output.txt

gives all scripts and files containing the command sulogin in the /etc dir.

(   (()
(`-' _\
 ''  ''
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LVL 43

Assisted Solution

by:ravenpl
ravenpl earned 664 total points
ID: 17007453
If it's RH or FC, my sollution was to force fsck not to fail. But it may fail for other filesystem than ext2/ext3 - never tested
echo "-y" > /fsckoptions # answer yes to all questions
chattr +i /fsckoptions # prevent from deleting
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by:techie411
ID: 17011338
How do I split points?  I'd like to give them to all 3 of you.  Thanks for your answers!  Much appreciated!! =)
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by:pjedmond
ID: 17011498
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