#1 2017-03-25 18:52:20

Luki

Member

Registered: 2016-11-16

Posts: 16

*Solved* Changing mount point gives me headache.

So, I came up with the wondrous idea of using rsync and cronjob to back up some files. for this purpose i use an SD card. with Gparted I named the card as "BU". What happens is that after a day or two (restart) it changes alone to "BU1".

What is this all about?

My Rsync command is as follows:

rsync --exclude-from '/home/pc/MEGA/Scripts/exclude.txt' -av --delete /home/pc /media/pc/BU/

Im hoping somebody can help me

Last edited by Luki (2017-03-25 19:31:55)

nobody

The Great

Registered: 2015-08-10

Posts: 3,655

Re: *Solved* Changing mount point gives me headache.

Easy solution: find the mount point of the SD card by its UUID instead of its filesystem label, which is best way to identify a filesystem really.

First, find the UUID:

lsblk -no NAME,UUID

A UUID might look like this: c37e0113-989a-4619-9972-c92a2b8a98b5 for Linux-native filesystems (ext, xfs) or short like: 63E8-13ED for FAT.

Then, use the following script to back up your stuff after replacing the value of NEEDLE with your UUID:

#!/bin/bash

readonly NEEDLE=877d3f4d-8290-41f8-9212-51844c5a168a

die() {
  echo "$@"
  exit 1
}

find_mountpoint() {
  local NAME UUID MOUNTPOINT
  lsblk -P -no NAME,UUID,MOUNTPOINT | while read LINE; do
    eval "$LINE"
    if [[ $UUID = $NEEDLE ]]; then
      if [[ -n "$MOUNTPOINT" ]]; then
        echo "$MOUNTPOINT"
        return 0
      else
        return 1
      fi
    fi
  done
  return 1
}

readonly MOUNTPOINT=$(find_mountpoint) || die "Backup file system is not mounted."

echo "Found backup file system at $MOUNTPOINT, starting backup."
rsync  --progress --human-readable --exclude-from '/home/pc/MEGA/Scripts/exclude.txt' -av --delete /home/pc "$MOUNTPOINT"/

This will continue to work even if the FS label changes, for whatever reason (I have no idea why this might happen without doing it manually; it could be because of the auto mounting tool/routine having a bug that mounts the fs with the unchanged label at another mount point with the '1' appended).

Luki

Member

Registered: 2016-11-16

Posts: 16

Re: *Solved* Changing mount point gives me headache.

....

Thanks! Looks like it's working.