From caa179efa440ab647607f487d481a8b09d0df813 Mon Sep 17 00:00:00 2001
From: Vincent Riquer <v.riquer@b2f-concept.com>
Date: Sat, 8 Oct 2011 03:42:59 +0200
Subject: [PATCH] use f00king functions! use ALL and EVERY backup (daily.1 to
 daily.$$MAX_ROTATE) for --link-dest

---
 remote-backup | 126 +++++++++++++++++++++++++++++++++-----------------
 1 file changed, 83 insertions(+), 43 deletions(-)

diff --git a/remote-backup b/remote-backup
index 5dea4f7..d839be1 100755
--- a/remote-backup
+++ b/remote-backup
@@ -60,8 +60,20 @@ then
 fi
 ###END: generic tool checker
 
-for config in /etc/remote-backup/*/config
+while getopts 'e:h' opt
 do
+	case $opt in
+		e)
+			EMERG="$OPTARG"
+		;;
+		h)
+			help
+		;;
+	esac
+done
+
+doBackup() {
+	config="$1"
 	if [ ! -e "$config" ]
 	then
 		echo "No backups defined, dying." >&2
@@ -70,16 +82,7 @@ do
 	source /etc/remote-backup/defaults.conf
 	source "$config"
 
-	echo "Debut de backup de ${REMOTE_LOCATION} vers ${SNAPSHOT_RW}/${NAME}/ a $(date)"
-
-# ------------- the script itself --------------------------------------
-
-# make sure we're running as root
-	if [ ! $UID -eq 0 ]
-	then
-		echo "Sorry, must be root.  Exiting..."
-		exit
-	fi
+	echo "Debut de backup de ${REMOTE_LOCATION} vers ${SNAPSHOT_RW}/${NAME}/ a $(date +"%H:%M, le %d/%m/%Y")"
 
 	if [[ "$REMOUNT" == "true" ]]
 	then
@@ -87,8 +90,8 @@ do
 		$MOUNT -o remount,rw "$MOUNT_DEVICE" "$SNAPSHOT_RW" ;
 		if (( $? ))
 		then
-			echo "snapshot: could not remount $SNAPSHOT_RW readwrite"
-			exit
+			echo "snapshot: could not remount $SNAPSHOT_RW readwrite" >&2
+			return 1
 		fi
 	fi
 
@@ -97,8 +100,31 @@ do
 		mkdir -p "$SNAPSHOT_RW/$NAME"
 	fi
 
-# rotating snapshots of /home (fixme: this should be more general)
+	if [[ "$2" == emerg ]]
+	then
+		runBackup emerg.$(date +%Y%m%d%H%M)
+	else
+		rotateBackup
+		runBackup daily.0
+	fi
 
+# now remount the RW snapshot mountpoint as readonly
+	if [[ "$REMOUNT" == "true" ]]
+	then
+		$MOUNT -o remount,ro "$MOUNT_DEVICE" "$SNAPSHOT_RW"
+		if (( $? ))
+		then
+			echo "snapshot: could not remount $SNAPSHOT_RW readonly"
+			exit
+		fi
+	fi
+
+	echo "Fin de backup de ${REMOTE_LOCATION} vers ${SNAPSHOT_RW}/${NAME}/ a $(date +"%H:%M, le %d/%m/%Y")"
+	echo '-----------------------------------------------------------------------'
+}
+
+rotateBackup() {
+# rotating snapshots
 	if [ -f "$SNAPSHOT_RW/$NAME/daily.0" ]
 	then
 		echo "Previous backup failed, skipping rotation."
@@ -120,42 +146,56 @@ do
 			fi
 		done
 	fi
+}
 
+runBackup() {
 # step 3: rsync from the system, linking to latest snapshot if files are
 # identical.
-	RSYNC_OPTS="-a \
-				--delete \
-				--delete-excluded \
-				--exclude-from=$EXCLUDES \
-				--bwlimit=$BWLIMIT"
+	RSYNC_OPTS="-a					\
+		--exclude-from=$EXCLUDES	\
+		--bwlimit=$BWLIMIT"
 	
-	if [ -d "$SNAPSHOT_RW/$NAME/daily.1/" ]
-	then
-		RSYNC_OPTS="$RSYNC_OPTS \
-					--link-dest=$SNAPSHOT_RW/$NAME/daily.1/"
-	fi
+	for((backup_num=0;backup_num <= MAX_ROTATE;backup_num++))
+	do
+		if [ -d "$SNAPSHOT_RW/$NAME/daily.$backup_num" ]
+		then
+			RSYNC_OPTS="$RSYNC_OPTS									\
+				--link-dest=$SNAPSHOT_RW/$NAME/daily.$backup_num"
+		fi
+	done
+	for old_backup in "$SNAPSHOT_RW/$NAME/emerg".*
+	do
+		if [ -d "$old_backup" ]
+		then
+			RSYNC_OPTS="$RSYNC_OPTS		\
+				--link-dest=$old_backup"
+		fi
+	done
 
-	$RSYNC \
-		$RSYNC_OPTS \
-		"${REMOTE_LOCATION}" \
-		"$SNAPSHOT_RW/$NAME/daily.0"
+	$RSYNC							\
+		$RSYNC_OPTS					\
+		"${REMOTE_LOCATION}"		\
+		"$SNAPSHOT_RW/$NAME/$1"
 
 # step 5: update the mtime of daily.0 to reflect the snapshot time
-	$TOUCH "$SNAPSHOT_RW/$NAME/daily.0"
+	$TOUCH "$SNAPSHOT_RW/$NAME/$1"
 
-# and thats it for home.
+# and thats it
+}
 
-# now remount the RW snapshot mountpoint as readonly
-	if [[ "$REMOUNT" == "true" ]]
-	then
-		$MOUNT -o remount,ro "$MOUNT_DEVICE" "$SNAPSHOT_RW"
-		if (( $? ))
-		then
-			echo "snapshot: could not remount $SNAPSHOT_RW readonly"
-			exit
-		fi
-	fi
+# make sure we're running as root
+if [ ! $UID -eq 0 ]
+then
+	echo "Sorry, must be root.  Exiting..."
+	exit
+fi
 
-	echo "Fin de backup de ${REMOTE_LOCATION} vers ${SNAPSHOT_RW}/${NAME}/ a $(date)"
-	echo '-----------------------------------------------------------------------'
-done
+if [ -n "$EMERG" ]
+then
+	doBackup /etc/remote-backup/"${EMERG//\//_}"/config emerg
+else
+	for config in /etc/remote-backup/*/config
+	do
+		doBackup "$config"
+	done
+fi