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hymie

Member

Registered: 2011-02-25

Posts: 66

question about my bash backup script [SOLVED]

I have more than one computer with more than one OS installed on each and am trying to unify all my bash scripts putting them all in the "dropbox" folder and having just symlinks from everywhere pointing to the scripts. So when I change something, I don't have to edit 20 ;-) different files. Trying to make my backup script  being "universal" I have slight problem and that is finding out the drive label of the root ("/") partition.
What I have is this two possibilities of getting the label of any /dev/sdXN:

label=$(sudo blkid /dev/sda2 -o value -s LABEL)
label=$(sudo e2label /dev/sda2)
if [ -z "$label" ]
then
  echo "ERROR: root partition has no label!"
  exit 1
fi

dest="/media/Backup/$HOSTNAME/$label"
if [ ! -d "$dest" ]
then
  sudo mkdir -p "$dest"
fi
.....

What I'm too stupid to get is the /dev/sdXN of the root partition or maybe the label of the root partition directly. I know that I could set a variable on each system to distinguish, but I'd like not to bother about that and having it done automatically, just putting a error-message when the root partition has no label at all.

Last edited by hymie (2011-11-29 13:38:55)

hymie

Member

Registered: 2011-02-25

Posts: 66

Re: question about my bash backup script [SOLVED]

I found a solution through "mount -l". Maybe there is a more "elegant" one, but this seems to work...

label=$(mount -l | grep " / ")
label="${label##*[}"
label="${label%]*}"

hymie

Member

Registered: 2011-02-25

Posts: 66

Re: question about my bash backup script [SOLVED]

Here's the complete script, after having tested it a bit - maybe it can serve anybody else ;-)
It expects (or not) 3 files for "rsync" in the home folder (pretty self-explanatory):
backup-etc
backup-exclude-root
backup-exclude-home
If any of the files is not present, it will simply not backup the respective folder...

#!/bin/bash
if [ -z "$(mount | grep " /media/Backup ")" ] 
then
  echo "ERROR: /media/Backup not mounted!"
  exit 1
fi

label=$(mount -l | grep " / ")
if [ "$label" == "${label/[/}" ]
then
  label=""
else
  label="${label##*[}"
  label="${label%]*}"
fi
if [ -z "$label" ]
then
  echo "ERROR: root partition has no label!"
  exit 1
fi
dest="/media/Backup/$HOSTNAME/$label"

if [ -f "$HOME/backup-etc" ]
then
  echo "***"
  echo "*** BACKUP /etc to $dest/etc"
  echo "***************"
  if [ ! -d "$dest/etc" ]
  then
    sudo mkdir -p "$dest/etc"
  fi
  sudo rsync -a --progress --files-from="$HOME/backup-etc" /etc/ "$dest/etc/"
fi

if [ -f "$HOME/backup-exclude-root" ]
then
  echo "***"
  echo "*** BACKUP /root to $dest/root"
  echo "***************"
  if [ ! -d "$dest/root" ]
  then
    sudo mkdir -p "$dest/root"
  fi
  sudo rsync -a --delete --progress --exclude-from="$HOME/backup-exclude-root" /root/ "$dest/root/"
fi

if [ -f "$HOME/backup-exclude-home" ]
then
  echo "***"
  echo "*** BACKUP $HOME to $dest$HOME"
  echo "***************"
  if [ ! -d "$dest$HOME" ]
  then
    sudo mkdir -p "$dest$HOME"
    sudo chown $(id -un):$(id -gn) "$dest$HOME"
  fi
  rsync -a --delete --progress --exclude-from="$HOME/backup-exclude-home" $HOME/ "$dest$HOME/"
fi

Last edited by hymie (2011-11-30 00:49:54)