108 lines
4.1 KiB
Bash
108 lines
4.1 KiB
Bash
|
#!/usr/bin/bash
|
||
|
|
|
||
|
|
|
||
|
|
###############################################################################
|
||
|
|
# do-daily-backup.sh #
|
||
|
|
###############################################################################
|
||
|
|
# This script is my attempt at replicating the same function that timeshift #
|
||
|
|
# performs. This is a very simplified script to handle automated btrfs #
|
||
|
|
# snapshots via a daily cron entry. #
|
||
|
|
# #
|
||
|
|
# EX: #
|
||
|
|
# ``` #
|
||
|
|
# 0 0 * * * /path/to/script #
|
||
|
|
# ``` #
|
||
|
|
# #
|
||
|
|
# Afer putting it in your crontab it will automatically handle your making #
|
||
|
|
# snapshots for your system and will only make up to the limit you set with #
|
||
|
|
# LIMIT. #
|
||
|
|
# #
|
||
|
|
# You will also have to configure your own subvols in the array decleration #
|
||
|
|
# SUBVOLS following the same format in the comments above it. #
|
||
|
|
# #
|
||
|
|
###############################################################################
|
||
|
|
|
||
|
|
|
||
|
|
# BEGIN: Variables
|
||
|
|
|
||
|
|
## Reusable vars
|
||
|
|
DATE=`date +%Y-%m-%d`
|
||
|
|
### Getting the name of the script (as it will be the first thing passed to bash when executing)
|
||
|
|
SCRIPT=`basename $0`
|
||
|
|
BACKUP_DIR=/.backups
|
||
|
|
### Setting dir to house log files
|
||
|
|
LOG_DIR=/var/log/$SCRIPT
|
||
|
|
|
||
|
|
LOG_FILE=$LOG_DIR/$DATE.log
|
||
|
|
|
||
|
|
## The amount of backups that are allowed of each configured subvols
|
||
|
|
LIMIT=5
|
||
|
|
|
||
|
|
## Because cron fucks our env, and loading /etc/bashrc doesn't always fix it
|
||
|
|
alias btrfs='/usr/bin/btrfs'
|
||
|
|
|
||
|
|
## The subvols that we want to backup
|
||
|
|
### <actual-directory>:<name-of-backup-dir>
|
||
|
|
declare -a SUBVOLS=(
|
||
|
|
/:root
|
||
|
|
/home:home
|
||
|
|
)
|
||
|
|
|
||
|
|
## To use to seperate named manual backups from automatic ones
|
||
|
|
DATE_REGEX='[0-9]{4}-[0-9]{2}-[0-9]{2}'
|
||
|
|
# END: Variables
|
||
|
|
|
||
|
|
|
||
|
|
# BEGIN: Pre-Work Checks
|
||
|
|
|
||
|
|
## This will check to make sure that the log directory has been created, if not it will create it
|
||
|
|
[[ ! -d $LOG_DIR ]] && mkdir -p $LOG_DIR
|
||
|
|
## Setting up the script to direct all output to the log file for this snapshot session
|
||
|
|
exec > $LOG_FILE
|
||
|
|
|
||
|
|
|
||
|
|
# END: Pre-Work Checks
|
||
|
|
|
||
|
|
|
||
|
|
# BEGIN: Work
|
||
|
|
for SUBVOL_INFO in ${SUBVOLS[@]}; do
|
||
|
|
|
||
|
|
## Stripping the delemited info out of the subvol entry
|
||
|
|
OIFS=$IFS
|
||
|
|
IFS=':'
|
||
|
|
read DIR NAME <<< "$SUBVOL_INFO"
|
||
|
|
IFS=$OIFS
|
||
|
|
echo "Subvol : $DIR, Name: $NAME"
|
||
|
|
|
||
|
|
SUBVOL_BACKUP_DIR=$BACKUP_DIR/$NAME
|
||
|
|
|
||
|
|
## This will handle creating the backup directory as well as the specific snapshot directory as well
|
||
|
|
[[ ! -d $SUBVOL_BACKUP_DIR ]] && mkdir -p $SUBVOL_BACKUP_DIR
|
||
|
|
|
||
|
|
## Implemented it this way so that it's less complex to handle when there are more backups than we are
|
||
|
|
## configured to keep. Definately a rather stupid way to implement it, but it works and requires less logic to handle
|
||
|
|
while true; do
|
||
|
|
## So that any manual ones I do (named pre-upgrade, etc) will remain. And it will only delete the
|
||
|
|
## Automatic timestamped ones
|
||
|
|
declare -a backups=( $( ls -1 $SUBVOL_BACKUP_DIR | grep -Eo $DATE_REGEX ) )
|
||
|
|
echo "${#backups[@]} backups were found the backup dir $SUBVOL_BACKUP_DIR"
|
||
|
|
|
||
|
|
if [[ ${#backups[@]} -ge $LIMIT ]]; then
|
||
|
|
SNAPSHOT_PATH="$SUBVOL_BACKUP_DIR/${backups[0]}"
|
||
|
|
echo "${#backups[@]} was found to be equal to or greater than $LIMIT. Deleting $SNAPSHOT_PATH."
|
||
|
|
btrfs subvol del "$SUBVOL_BACKUP_DIR/${backups[0]}"
|
||
|
|
else
|
||
|
|
break
|
||
|
|
fi
|
||
|
|
|
||
|
|
## Unsetting the backups list so that it can be reloaded again
|
||
|
|
unset backups $SNAPSHOT_PATH
|
||
|
|
done
|
||
|
|
|
||
|
|
SNAPSHOT=$SUBVOL_BACKUP_DIR/$DATE
|
||
|
|
## If the snapshot doesn't already exist, then create a new read-only snapshot
|
||
|
|
[[ ! -d $SNAPSHOT ]] && btrfs subvol snapshot -r $DIR $SNAPSHOT
|
||
|
|
done
|
||
|
|
|
||
|
|
# END: Work
|