Karel Zak wrote:
> On Wed, Jan 08, 2014 at 06:55:41PM +0100, Stanislav Brabec wrote:
> > Attempting to mount of already mounted devices is a common situation in
> > many scripts.
>
> What about to fix the scripts? :-)
>
> All you need is to call
>
> findmnt --source <dev> --target <mountpoint>
Yes, it is an option.
The new behavior could simplify common situation and also prevent a
race:
if the device is not yet mounted
mount it
do the work
> > Would be acceptable a patch that adds "already mounted" to "nofail"?
>
> Maybe.
Well, It could be a straightforward solution (~2 lines change). But it
could break following script (theoretical, a bit dumb and fragile, but
still depending only on documented behavior):
... do some actions that will initiate delayed $DEVICE creation ...
while mount -o nofail $DEVICE /opt ; do
if test -d /opt/myvendor ; then
break
fi
sleep 1
done
Now imagine, that somebody previously called:
mount $DEVICE /opt
What will happen with the current mount?
The script will fail as expected.
What will happen after such patch?
The script will enter to a dead loop.
> > - Make possible to use "-a" with further arguments.
>
> mount -a /foo /bar [...]
>
> Right?
Well, it sounds interesting as well, but I was thinking about
(conflicting):
mount -a /dev/device /mountpoint
It can be done both:
mount -a /foo /bar [...]
mount -A /dev/device /mountpoint
-A Do not report errors if the mount point is already used or device is
already mounted.
--
Best Regards / S pozdravem,
Stanislav Brabec
software developer
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