WIP, rewrite in Python

btv.zsh

@@ -0,0 +1,105 @@
+#! /bin/zsh
+
+setopt extendedglob
+
+function die() {
+	echo "!!! $1"
+	exit 1
+}
+
+### read the config file
+source /etc/btv/config
+
+### verify keyfile sanity
+if [[ ! -a "${KEYFILE}" ]]; then
+	echo "The keyfile (${KEYFILE}) does not exist."
+	exit 2
+fi
+
+KEYFILE_OWNER=$(stat -c "%u" $KEYFILE)
+KEYFILE_ACCESS=$(stat -c "%a" $KEYFILE)
+
+if [[ ${KEYFILE_OWNER} -ne 0 ]]; then
+	echo "The keyfile (${KEYFILE}) is owned by UID ${KEYFILE_OWNER}, it should be 0 (root)."
+	exit 2
+fi
+
+if [[ ${KEYFILE_ACCESS} -ne 600 ]]; then
+	echo "The keyfile (${KEYFILE}) has permissions ${KEYFILE_ACCESS}, it should be 600 (rw-------)."
+	exit 2
+fi
+
+VERB="$1"
+shift
+
+function drop_snap {
+	SNAP="${1}"
+	
+	for S in "${SNAP}/"*
+	do
+		btrfs subvolume delete "$S"
+	done
+	
+	rmdir "${SNAP}"
+}
+
+case "$VERB" in
+	(snap*)
+		T="$(date +%Y-%m-%d.%H%M%S)"
+		SNAP="${SNAP_DIR}/${T}"
+		echo "Creating snapshot ${SNAP}"
+		mkdir "${SNAP}" || die "failed to mkdir ${SNAP}"
+		
+		cd "${SUBVOL_DIR}" || die "failed to cd ${SUBVOL_DIR}"
+		
+		for SUB in ^${SUBVOL_IGNORE_PREFIX}*
+		do
+			btrfs subvolume snapshot -r "${SUB}" "${SNAP}/${SUB}" || die "failed to btrfs snap ${SUB}"
+		done
+		
+		;;
+	
+	(list)
+		cd "${SNAP_DIR}"
+		
+		for SNAP in *
+		do
+			if [[ -f "${SNAP}/streamed" ]]; then
+				printf "S"
+			else
+				printf " "
+			fi
+		done
+		
+		echo
+		echo "S = streamed to storage"
+		echo "R = scheduled for removal"
+		
+		;;
+	
+	(drop)
+		SNAP="${SNAP_DIR}/${1}"
+		
+		if [[ ! -d ${SNAP} ]]; then
+			echo "Snapshot ${1} does not exist"
+			exit 3
+		fi
+		
+		echo "Dropping $SNAP"
+		drop_snap "$SNAP"
+		;;
+	
+	(clean*)
+		echo ">>> gc"
+		;;
+	
+	(stream)
+		echo ">>> stream $1"
+		;;
+	
+	(*)
+		echo "Unknown verb: ${VERB}"
+		exit 3
+		;;
+esac
+