This is the mail archive of the cygwin mailing list for the Cygwin project.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Re: Why umount -A is a really bad idea


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/

--
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple
Problem reports:       http://cygwin.com/problems.html
Documentation:         http://cygwin.com/docs.html
FAQ:                   http://cygwin.com/faq/


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]