mirror of https://github.com/nirenjan/dotfiles.git
Add backup script to copy folder contents
Folder contents can be either tarred and gzipped or saved to a git repository. The default configuration is to use git and tags every time the backup is made, even if there were no commits.master
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#!/bin/bash
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# Script to backup folders to either a tarball or a Git repository
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# Script expects to run at most on a daily basis. Any faster, and you risk
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# overwriting a previous backup.
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# Default environment variables used
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BACKUP_METHOD=git
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BACKUP_TS=$(date +%F)
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BACKUP_DEBUG=false
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BACKUP_SRC=''
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BACKUP_DST=''
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BACKUP_DB=''
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APP=$(basename $0)
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# Usage function will display the usage
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usage()
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{
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local backup=$APP
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local exit_code=$1
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[[ -z $exit_code ]] && exit_code=0
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echo "Usage: $backup [options] <source path>"
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echo "Options:"
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echo " -s tar Save to a tarball, format is backup-%Y-%m-%d.tar.gz"
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echo " This is the default."
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echo " -s git Save to a git repository and tag the commit"
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echo
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echo " -t <dst> Specify the path to save the backup to. If omitted,"
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echo " it defaults to ~/backups/\$(basename <src>)"
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echo
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echo " -d <db> Specify a MySQL database to backup in addition to"
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echo " the files in the source path. This requires you to"
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echo " save the MySQL root password in ~/.my.cnf"
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echo
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echo " -h Display this help message"
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exit $exit_code
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}
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# Die function will print the error message to stderr and abort the script
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die()
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{
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local exit_code=$1
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local backup=$APP
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shift
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for msg in "$@"
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do
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echo -e "$backup: $msg" >&2
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done
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exit $exit_code
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}
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# Sanity check
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backup_sanity()
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{
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if [[ -z $BACKUP_SRC ]]
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then
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die 1 "Need to specify a source"
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fi
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# Run basic sanity checks on env variables
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if [[ -z $BACKUP_DST ]]
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then
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BACKUP_DST=$HOME/backups/$(basename $BACKUP_SRC)
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fi
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mkdir -p $BACKUP_DST
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if [[ $? != 0 ]]
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then
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die 2 "Error creating backup folder"
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fi
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}
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# Retrieve data using rsync
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backup_data()
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{
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# Don't rsync if we are using tar as the backup method
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if [[ "$BACKUP_METHOD" != "tar" ]]
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then
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rsync -a $BACKUP_SRC $BACKUP_DST
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if [[ $? != 0 ]]
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then
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die 2 "Error syncing data from source $BACKUP_SRC"
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fi
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fi
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}
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# Backup the database
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backup_db()
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{
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if [[ ! -z $BACKUP_DB ]]
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then
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# Dump using mysqldump
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mysqldump -u root $BACKUP_DB >$BACKUP_DST/$BACKUP_DB.sql 2>/dev/null
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if [[ $? != 0 ]]
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then
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die 2 "Error dumping database $BACKUP_DB"
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fi
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fi
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}
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# Save the files to git repo or tarball
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backup_save()
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{
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if [[ "$BACKUP_METHOD" == "tar" ]]
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then
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cd $BACKUP_SRC
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local daily=$BACKUP_DST/backup-daily-$BACKUP_TS.tar.gz
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tar czf $daily .
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# Weekly tarballs every Sunday
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if [[ $(date +%w) == "0" ]]
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then
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local weekly=$BACKUP_DST/backup-weekly-$(date +%Y-%U).tar.gz
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ln $daily $weekly
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fi
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# Monthly tarballs on the first of every month
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if [[ $(date +%-d) == "1" ]]
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then
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local monthly=$BACKUP_DST/backup-monthly-$(date +%Y-%m).tar.gz
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ln $daily $monthly
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fi
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else
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cd $BACKUP_DST
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git init -q
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git config core.safecrlf false
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git add .
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git commit -m "Backup of $BACKUP_SRC on $BACKUP_TS"
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git tag -am "Daily ($BACKUP_TS) backup of $BACKUP_SRC" daily-$BACKUP_TS
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# Weekly tags every Sunday
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if [[ $(date +%w) == "0" ]]
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then
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local week=$(date +%Y-%U)
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git tag -am "Weekly ($week) backup of $BACKUP_SRC" weekly-$week
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fi
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# Monthly tags on the first of every month
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if [[ $(date +%-d) == "1" ]]
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then
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local month=$(date +%Y-%m)
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git tag -am "Monthly ($month) backup of $BACKUP_SRC" monthly-$month
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fi
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fi
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}
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while getopts :hs:t:d: OPTION
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do
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case $OPTION in
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h)
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# Help
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usage 0
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;;
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s)
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# Backup method
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if [[ "$OPTARG" == "git" || "$OPTARG" == "tar" ]]
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then
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BACKUP_METHOD=$OPTARG
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else
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die 1 "Backup method must be one of git or tar"
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fi
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;;
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t)
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# Target folder
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BACKUP_DST=$OPTARG
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;;
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d)
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# Database
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BACKUP_DB=$OPTARG
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;;
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:)
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# Missing required argument
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die 1 "Missing argument for option -$OPTARG"
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;;
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\?)
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# Invalid option
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die 1 "Invalid option: -$OPTARG"
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;;
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esac
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done
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# Shift away the options
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shift $(($OPTIND - 1))
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BACKUP_SRC=$1
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backup_sanity
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backup_data
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backup_db
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backup_save
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