From e589eff80a403bfe7831c040fe55a6bcf5ba038b Mon Sep 17 00:00:00 2001
From: Marc Vertes <mvertes@free.fr>
Date: Mon, 6 Dec 2021 15:02:31 +0100
Subject: update

---
 bin/backup | 55 +++++++++++++++++++++++++++++++++----------------------
 1 file changed, 33 insertions(+), 22 deletions(-)

(limited to 'bin/backup')

diff --git a/bin/backup b/bin/backup
index 72c69c3..3964927 100755
--- a/bin/backup
+++ b/bin/backup
@@ -1,36 +1,47 @@
 #!/bin/sh
-# Incremental backup using rsync(1).
 
-[ "$USER" = root ] || exec sudo "$0" "$@"
+usage() {
+	echo "Usage: $0 [-nv] [[[user@]host]:dir]
 
-backup() {
-	date=$(date +%Y%m%d_%H%M%S)
-	last=$(rsync --list-only "$dest/" 2>/dev/null | cut -b 47- | tail -1)
+Incremental backup using rsync(1). If run as root, a full system
+backup is performed. Otherwise, the user's home directory is backed.
 
-	case $last in
-	([12]*) opt_link=--link-dest=../$last;;
-	(*) opt_link=;;
-	esac
+Options:
+-n	dry-run
+-v	verbose
 
-	rsync -HSxa$optv --exclude-from=$ignore $opt_link / /boot "$dest/$date"
-}
+Files:
+- $HOME/.backupignore	exclude files from user backup (non root)
+- /etc/backupignore		exclude files from system backup (root)
 
-dest=/.history
-ignore=/etc/backup/ignore
+Environment:
+- BACKUP	backup directory"
+}
 
-while getopts :d:i:nv opt; do
+while getopts :nv opt; do
 	case $opt in
-	(d) dest="$OPTARG" ;;
-	(i) ignore="$OPTARG" ;;
 	(n|v) optv="$opt$optv" ;;
-	(*) echo "Usage: $0 [-nv] [-d [host:]dir] [clean|diff]"; exit 1 ;;
+	(*) usage; exit 1 ;;
 	esac
 done
 shift $((OPTIND - 1))
 
-[ "$1" ] && cmd=$1 && shift || cmd=""
-case $cmd in
-(""|save) backup ;;
-(clean) exec backup-clean ${optv+-$optv} "$dest";;
-(diff) exec diffdir "$@";;
+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=
+
+last=$(rsync --list-only "$BACKUP/" 2>/dev/null | awk '{r=$NF} END {print r}')
+case $last in
+([12]*) opt_link=--link-dest=../$last;;
+(*) opt_link=;;
 esac
+
+date=$(date +%Y-%m-%d-%H%M%S)
+
+[ "$optv" ] && echo "# Backup $volumes to $BACKUP/$date"
+
+exec rsync -HSxa$optv $ignore $opt_link $volumes "$BACKUP/$date"
-- 
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