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#!/bin/sh
# A backup a day keeps the doctor away.
usage() {
echo "Usage: $0 [-nv] [[[user@]host]:dir]
Incremental backup using rsync(1). If run as root, a full system
backup is performed. Otherwise, the user's home directory is backed.
Options:
-n dry-run
-v verbose
Files:
- $HOME/.backupignore exclude files from user backup (non root)
- /etc/backupignore exclude files from system backup (root)
Environment:
- BACKUP backup directory"
}
while getopts :nv opt; do
case $opt in
(n|v) optv="$opt$optv" ;;
(*) usage; exit 1 ;;
esac
done
shift $((OPTIND - 1))
BACKUP=${1:-$BACKUP}
[ "$BACKUP" ] || { usage; exit 1; }
[ "$USER" = root ] &&
ignore=/etc/backupignore volumes='/ /boot' ||
ignore="$HOME/.backupignore" volumes="$HOME"
[ -f "$ignore" ] && ignore="--exclude-from=$ignore" || ignore=
now=$(date +%F)
opt_link=''
past=$(rsync --list-only "$BACKUP/" 2>/dev/null | awk '{print $NF}' | sort -r)
for f in $past
do
case $f in
([0-9][0-9][0-9][0-9]-*) ;;
(*) continue ;;
esac
[ "$f" = "$now" ] && continue
opt_link="--link-dest=../$f"
break
done
echo "# Backup $volumes to $BACKUP/$now"
exec rsync -HSXxa$optv $ignore $opt_link $volumes "$BACKUP/$now"
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