On Tue, Mar 17, 2015 at 04:08:58PM +0100, Ruediger Meier wrote:
> Hi,
>
> I wonder what is the correct way to find a mount which is mounted to a
> certain target directory. findmnt --target will also find a mount if
> you specify a subdirectory of a mountpoint:
>
> $ mkdir /tmp/bla
> $ findmnt --target /tmp/bla
> TARGET SOURCE FSTYPE OPTIONS
> /tmp /dev/mapper/vg0-tmpdirs[/tmp] ext4 ....
>
> The man page let me think that --target should not find the parent
> directory.
No, it's expected behavior since:
commit b215d8e9a71ca8d22df6111ddc9d28bd896febb1
Author: Dave Reisner <dreisner@xxxxxxxxxxxxx>
Date: Wed Apr 25 20:30:52 2012 -0400
and the current git tree contains:
-T, --target path
Explicitly define the mount target (mountpoint
directory). If the path is not a mountpoint file
or directory than findmnt checks path elements in
reverse order for get the mountpoint (this
feature is supported only if search in kernel
files and unsupported for --fstab).
> $TS_CMD_MOUNT --move $DIR_A $DIR_B
>
> # check the move
> $TS_CMD_FINDMNT --kernel --target "$DIR_B" &> /dev/null
> [ "$?" == "0" ] || ts_die "Cannot find binded $DIR_B"
> [...]
>
> This findmnt line will never fail I guess.
Right, this is mistake, solution is to remove --target:
TS_CMD_FINDMNT --kernel "$DIR_B" &> /dev/null
The disadvantage is that without --source/target findmnt(8) tries
to use the path as source and then as target. It's bad in same cases.
Maybe we need a new option to disable the evaluation of the target
path elements. (--strict-target)
Karel
--
Karel Zak <kzak@xxxxxxxxxx>
http://karelzak.blogspot.com
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