Script to unmount and mount by UUID Post: 302887565

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Top Forums Shell Programming and Scripting Script to unmount and mount by UUID Post 302887565 by gtr33m on Saturday 8th of February 2014 10:17:26 PM

02-08-2014

Registered User

Script to unmount and mount by UUID

Hi,

Need a bit of help on this one as I am a scripting noob.

I have a linux based NAS that mounts USB hard drives in an inconsistent location and to make matters worse, seems to lose the mount for an unknown reason and doesn't remount automatically unless the drive is removed and re-inserted.

I'd like to make a script with that checks for a mounted drive by UUID, then checks it's mounted location and if not mounted in the location I want, unmounts then remounts in the correct location

What I have been able to figure out so far is that I can use

Code:

usbuuid=917086e7-9115-44fe-b176-b1a79f04e739
blkid|grep $usbuuid

to find it's /dev/xxx location, but I still need to parse the results to get rid of the extra info, and I'd like to then put the parsed info into a variable say usbdev.

I want to then used that variable with

Code:

mount|grep $usbdev

Again I need to parse the result to find the mount location, if any

If mounted, but not mounted in my desired location, I want to unmount it and remount it in the correct location. If not mounted, mount. If mounted correctly, do nothing. Then keep checking routinely in case the mount is lost.

I should point out that I can't change fstab. It's protected and even if I change it reverts on reboot.

I can schedule a cron job, or a startup script.

The other would be to dynamically create or change a dynamic link to which ever location the system mounts the USB, but I would still need a script to check if it's mounted and re-mount if necessary, and I have a problem that samble does not follow symbolic links and this setting can't be changed.

Any help would be appreciated.

Mark

gtr33m

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mount

MOUNT(2)							System Calls Manual							  MOUNT(2)

NAME

       mount, umount - mount or umount a file system

SYNOPSIS

       #include <unistd.h>
       #include <sys/mount.h>

       int mount(char *special, char *name, int flag)
       int umount(char *name)

DESCRIPTION

       Mount()	tells the system that the file system special is to be mounted on the file name, effectively overlaying name with the file tree on
       special.  Name may of any type, except that if the root of special is a directory, then name must also be a directory.  Special must  be  a
       block  special file, except for loopback mounts.  For loopback mounts a normal file or directory is used for special, which must be seen as
       the root of a virtual device.  Flag is 0 for a read-write mount, 1 for read-only.

       Umount() removes the connection between a device and a mount point, name may refer to either of them.  If more than one device  is  mounted
       on  the	same  mount  point  then unmounting at the mount point removes the last mounted device, unmounting a device removes precisely that
       device.	The unmount will only succeed if none of the files on the device are in use.

       Both calls may only be executed by the super-user.

SEE ALSO

       mount(1), umount(1).

AUTHOR

       Kees J. Bot (kjb@cs.vu.nl)

																	  MOUNT(2)