simplify shapshot naming

btv

@@ -8,6 +8,7 @@ import datetime
 import json
 import os
 import shlex
+import shutil
 import sys
 import time
 import socket
@@ -198,9 +199,9 @@ def serialize(snap, outdir, key, snap_from=None):
 	## prepare directories
 	##
 	if snap_from:
-		name = "%s diff from %s" %(snap.name, snap_from.name)
+		name = "%s to %s" %(snap_from.name, snap.name)
 	else:
-		name = "%s full" %(snap.name)
+		name = snap.name
 	
 	directory = os.path.join(outdir, name)
 	os.makedirs(directory)
@@ -246,14 +247,19 @@ def serialize(snap, outdir, key, snap_from=None):
 	## final touches
 	##
 	
-	## add a self-check executable
+	## add self-check and unpack executables
 	with open(os.path.join(directory, "check-integrity.sh"), "w") as f:
 		f.write("#! /bin/sh\n\nsha512sum --check manifest.sha512\n")
 		os.chmod(f.name, 0o500)
 	
+	unpack_path = os.path.join(directory, "unpack.sh")
+	shutil.copy("/usr/share/btv/unpack.sh", unpack_path)
+	os.chmod(unpack_path, 0o500)
+	
 	## fix permissions and ownership of created objects
 	outdir_stat = os.stat(outdir)
 	os.chown(directory, outdir_stat.st_uid, outdir_stat.st_gid)
+	os.chmod(directory, 0o700)
 	
 	for file in os.listdir(directory):
 		path = os.path.join(directory, file)

unpack.sh

@@ -0,0 +1,24 @@
+#! /bin/zsh
+
+TIMESTAMP=($(basename "$(pwd)"))
+OUTDIR="$1"
+KEYFILE="$2"
+
+function die {
+	>&2 echo "$2"
+	exit $1
+}
+
+[[ "$0" != "./unpack.sh" ]] && die 1 "This can only be executed from the snapshot directory itself."
+[[ ! -d "$OUTDIR" ]]       && die 1 "The first argument must be a directory to unpack subvolumes into."
+[[ ! -f "$KEYFILE" ]]      && die 1 "The second argument must be a readable keyfile."
+./check-integrity.sh       || die 2 "This snapshot failed integrity checks."
+
+### end of checks
+
+for ARCHIVE in *btrfs.zst.aes
+do
+	openssl enc -d -aes-256-cbc -pbkdf2 -salt -pass "file:$KEYFILE" < "$ARCHIVE" | zstd -d | btrfs receive "$OUTDIR" || die 3 "Failed to unpack subvolume."
+	SUBVOL_NAME=${ARCHIVE%%.btrfs.zst.aes}
+	mv "${OUTDIR}/${SUBVOL_NAME}" "${OUTDIR}/${SUBVOL_NAME}.${TIMESTAMP[1]}" || die 4 "Failed to rename subvolume."
+done