Why umount -A is a really bad idea

[Colin JN Breame]

Or even at a break with tradition; cygmappath and cygunmappath.


Doctor Bill wrote:

>It seems like there is endless confusions with cygwin mount's because
>the name of the command is the same as the Unix mount command, and
>some of the command line options are similar.  Has anyone given
>serious consideration to renaming the command to something like,
>cygmount?
>
>                                        Bill
>
>
>On Thu, 26 Aug 2004 12:48:38 +0200, Reini Urban <rurban@x-ray.at> wrote:
>  
>
>>Igor Pechtchanski schrieb:
>>    
>>
>>>On Wed, 25 Aug 2004, Mike wrote:
>>>      
>>>
>>>>On Wed, 25 Aug 2004, Colin JN Breame wrote:
>>>>        
>>>>
>>>>>I tried this once, just to see what would happen.  I then spent the
>>>>>next hour restoring the mount points.  I've learnt a valuable
>>>>>lesson...
>>>>>          
>>>>>
>>>>Why would a 'mount -a' not work after your 'umount -a' to restore the
>>>>mounts?
>>>>
>>>>Mike
>>>>        
>>>>
>>>Because Cygwin's mounts aren't the same as Unix mounts.  The mount and
>>>umount commands on Cygwin modify the mount table directly, so that a
>>>umount really is permanent.  However (and this concerns the OP, too), you
>>>can save the mount table as the output of "mount -m", which you can later
>>>use to restore the mounts.
>>>      
>>>
>>not really.
>>I used to do that quite often, but since /bin and /usr/bin are not known
>>to cygwin anymore after umount -a (and not in the path) I came with this
>>workaround.
>>
>>#!/bin/sh
>># save mounts
>>BIN=`cygpath -w /bin | sed 's|\\\\|/|g'`
>>mount -m | sed "s|^mount|$BIN/mount|" | tee savemounts
>>umount -a
>>
>># nano or $EDITOR will not work now to fix savemounts!
>>
>># restore
>>.. savemounts
>>
>>it will look like "f:/cygnus/bin/mount" now. This will be found, on NT
>>at least.
>>
>>
>>    
>>
>>>For those unfortunate enough to have done a "umount -a" without saving the
>>>mounts via "mount -m", the minimum necessary mounts for Cygwin to work are
>>>
>>>mount -sbc /cygdrive
>>>mount -fsb c:/cygwin /
>>>mount -fsb c:/cygwin/bin /usr/bin
>>>mount -fsb c:/cygwin/lib /usr/lib
>>>
>>>(that is provided that you installed Cygwin in c:/cygwin).
>>>      
>>>
>>--
>>Reini Urban
>>http://xarch.tu-graz.ac.at/home/rurban/
>>
>>
>>
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>>    
>>
>
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