added basic snapshot management....

Signed-off-by: Alex A. Naanou <alex.nanou@gmail.com>

Archive/media/img/my/work/sync-flash.sh

@@ -21,12 +21,14 @@ COPYFLAGS=$RSYNCFLAGS
 # XXX need to test if this exists...
 VERIFY=jdupes
 VERIFYFLAGS="-r -u -I"
-DO_VERIFY=1
+DO_VERIFY=
 
 
 COMPRESS=./compress-archive.sh
 DO_COMPRESS=1
 
+SNAPSHOT=../../../../snapshot.sh 
+
 
 # Config file to contain all the default settings...
 # XXX not sure if this is a good idea...
@@ -352,6 +354,11 @@ if [[ $DO_COMPRESS ]] ; then
 	echo "Compressing archive: done."
 fi
 
+##if ! [ -z "$SNAPSHOT" ] \
+##		&& [ -e "$SNAPSHOT" ] ; then
+##	"$SNAPSHOT"
+##fi
+
 # XXX add report...
 # XXX
 

Archive/snapshot.sh

@@ -19,6 +19,7 @@
 
 SNAPSHOT_DIR=.snapshots
 SUBVOLUME_DIR=media
+SNAPSHOT_COUNT=5
 
 
 # run in script dir (not cwd)...
@@ -29,13 +30,11 @@ fi
 
 # check if on btrfs filesystem...
 # XXX also check if btrfs command is available...
-if ! btrfs filesystem usage . > /dev/null ; then
+if ! btrfs filesystem usage . > /dev/null 2>&1 ; then
 	exit
 fi
 
 
-#SNAPSHOT_COUNT=
-
 
 # create ./media...
 # XXX check if not a directory...
@@ -44,7 +43,7 @@ if ! [ -e "$SUBVOLUME_DIR" ] ; then
 	# XXX build tree -- ImageGrid
 
 # convert ./media to a subvolume...
-elif [ "$(stat --format=%i "$SUBVOLUME_DIR")" == 256 ] ; then
+elif ! [ "$(stat --format=%i "$SUBVOLUME_DIR")" == 256 ] ; then
 	mkdir bak
 	mv "$SUBVOLUME_DIR" bak/
 	btrfs subvolume create "$SUBVOLUME_DIR"
@@ -58,12 +57,30 @@ mkdir -p "$SNAPSHOT_DIR"
 # XXX should this be more human readable???
 # 	...a date + number maybe???
 SNAPSHOT=$(( 
-	$( ls "$SNAPSHOT_DIR" \
+	$( ls "$SNAPSHOT_DIR/" \
 		| sort -n \
 		| tail -n 1 ) \
 	+ 1 ))
 
-btrfs subvolume snapshot -r "$SUBVOLUME_DIR" "${SNAPSHOT_DIR}/${SNAPSHOT}"
+#btrfs subvolume snapshot -r "$SUBVOLUME_DIR" "${SNAPSHOT_DIR}/${SNAPSHOT}"
+btrfs subvolume snapshot "$SUBVOLUME_DIR" "${SNAPSHOT_DIR}/${SNAPSHOT}"
+
+
+if [[ $SNAPSHOT_COUNT =~ [0-9]* ]] \
+		&& [ "$SNAPSHOT_COUNT" != 0 ] ; then
+	SNAPSHOTS=($(\
+		ls "$SNAPSHOT_DIR/" \
+			| sort -n ))
+	remove=$(( ${#SNAPSHOTS[@]} - $SNAPSHOT_COUNT - 1 ))
+	while (( $remove >= 0 )) ; do
+		# XXX can we avoid sudo here???
+		# XXX is 'btrfs subvolume delete ...' the same as 'rm -rf ..'
+		#sudo btrfs subvolume delete -c ${SNAPSHOT_DIR}/${SNAPSHOTS[$remove]}
+		echo Removing snapshot: ${SNAPSHOT_DIR}/${SNAPSHOTS[$remove]}
+		rm -rf ${SNAPSHOT_DIR}/${SNAPSHOTS[$remove]}
+		remove=$(( $remove - 1 ))
+	done
+fi