[SOLVED] Check if drive is present

Fixit7 · 02-17-2016, 10:58 PM

I use this script to backup files.

What can I use to check whether the drives are plugged in, so I know that the copy failed ?

I would like to use gxmessage to let me know if the drives are not plugged in or mounted.

Quote:

cd /etc
zip -u fstab_Puppy_6.3.0.zip fstab
cp -u fstab_Puppy_6.3.0.zip /mnt/sdb1/Linux_Files
cp -u fstab_Puppy_6.3.0.zip /mnt/sdc2/Linux_Files

TenTenths · 02-18-2016, 02:51 AM

Not familiar with puppy but you could achieve this with bash scripting.

Create a file ".backupdrive" in the Linux_Files folders with your drives mounted.

In a bash script you can loop through the mount points and detect if that file exists, if it does then you're good and can back up to the mount point.

Code:

#!/bin/bash

# Clear our exit value, we'll set this later if we get an issue.
EXITWITH=0

# Loop through a list of mountpoints (yes, we could make this a variable but we'll keep it simple for now)
for MOUNTPOINT in sdb1 sdc2 ; do

  # Test for the non-existence of our identifying file in the relevant mount point/folder
  if [[ ! -f mnt/${MOUNTPOINT}/Linux_Files/.backupdrive ]] ; then

    # Display an error message
    echo "/mnt/${MOUNTPOINT} Drive not mounted or wrong drive."

    # Override the EXITWITH value as we're going to exit when we get out the loop
    EXITWITH=1

  fi

done

# Now when we get here we will have set our EXITWITH to 1 if there was a problem.
# So now we just test this and if it's not equal to 0 then we exit the script.
if [ ${EXITWITH} -ne 0 ] ; then
  exit ${EXITWITH}
fi

# Regular Script Continues Here

The above will check ALL the supplied mountpoints and will report which (if any) are missing.

If you want a simpler script that will just exit with an error if any of the mountpoints are missing you can use:

Code:

#!/bin/bash

for MOUNTPOINT in sdb1 sdc2 ; do
  if [[ ! -f mnt/${MOUNTPOINT}/Linux_Files/.backupdrive ]] ; then
    echo "/mnt/${MOUNTPOINT} Drive not mounted or wrong drive."
    exit 1
  fi
done

# Regular Script Continues Here

Replace the "echo" with whatever notification mechanism you'd prefer.

Hope this gives you a starting point.

Fixit7 · 02-18-2016, 07:15 AM

Thanks ten tenths.

TenTenths · 02-18-2016, 07:29 AM

You're welcome, let me know if it works out for you.

Fixit7 · 02-18-2016, 03:52 PM

I used your script with this one addition.

Quote:

gxmessage -timeout 2 "DRIVE /MNT/${MOUNTPOINT} NOT MOUNTED OR WRONG DRIVE."

Fixit7 · 02-18-2016, 04:11 PM

This worked last night, but now it says mnt/sdb1 not mounted when it is ??

Quote:

#
for MOUNTPOINT in sdb1 sdc2 ; do
if [[ ! -f mnt/${MOUNTPOINT}/Linux_Files/.backupdrive ]] ; then
gxmessage -timeout 2 "DRIVE /MNT/${MOUNTPOINT} NOT MOUNTED OR WRONG DRIVE."
exit 1
fi
done
gxmessage -timeout 2 "Got past drive check."

smallpond · 02-18-2016, 04:23 PM

I've stopped leaving my backup drive mounted due to the encrypting ransomware. My backup script checks for known strings in a set of canary files before mounting the drive and starting the backup. It umounts the drive when done.

Fixit7 · 02-18-2016, 10:45 PM

What are canary files ?

What are the names of ransom ware programs ?

I have never had a problem with malware in Linux, not the case in Win XP.

TenTenths · 02-19-2016, 04:32 AM

Quote:

Originally Posted by Fixit7

This worked last night, but now it says mnt/sdb1 not mounted when it is ??

check that whatever process you have didn't blank the .backupdrive file, or ensure that whatever user your script runs as has access to that file. For example, if you created that file as "root" you may want to chmod 644 it.

michaelk · 02-19-2016, 06:19 AM

Code:

if [[ ! -f mnt/${MOUNTPOINT}/Linux_Files/.backupdrive ]] ; then

I would think it should be:

Code:

if [[ ! -f /mnt/${MOUNTPOINT}/Linux_Files/.backupdrive ]] ; then

TenTenths · 02-19-2016, 06:22 AM

Quote:

Originally Posted by michaelk

Code:

if [[ ! -f mnt/${MOUNTPOINT}/Linux_Files/.backupdrive ]] ; then

I would think it should be:

Code:

if [[ ! -f /mnt/${MOUNTPOINT}/Linux_Files/.backupdrive ]] ; then

Yeah, you're probably right, when I was writing the script I was in a folder and faking mnt under it.

Fixit7 · 02-19-2016, 03:53 PM

Quote:

Originally Posted by michaelk

Code:

if [[ ! -f mnt/${MOUNTPOINT}/Linux_Files/.backupdrive ]] ; then

I would think it should be:

Code:

if [[ ! -f /mnt/${MOUNTPOINT}/Linux_Files/.backupdrive ]] ; then

I do not see any difference.

michaelk · 02-19-2016, 03:57 PM

mnt/${MOUNTPOINT}/Linux_Files/.backupdrive
vs
/mnt/${MOUNTPOINT}/Linux_Files/.backupdrive

Without the leading / mnt/${MOUNTPOINT}/Linux_Files/ becomes a relative path. If you run the script without being in /(root} directory the conditional will always be true.

Fixit7 · 02-19-2016, 03:59 PM

Thanks.

michaelk · 02-19-2016, 04:01 PM

I actually meant to say you will always get the drive not mounted message.