From 99e0e079f76be0b4a3180c3d6bce2e348a2d9122 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Karel=20Ko=C4=8D=C3=AD?= <cynerd@email.cz>
Date: Tue, 24 Jan 2017 17:05:04 +0100
Subject: Reimplement backup so it uses BTRFS now

rsync-backup is no longer required.
---
 local/bin/system-backup | 47 ++++++++++++++++++++++++++++++++---------------
 1 file changed, 32 insertions(+), 15 deletions(-)

(limited to 'local/bin/system-backup')

diff --git a/local/bin/system-backup b/local/bin/system-backup
index 956ba31..fde63c4 100755
--- a/local/bin/system-backup
+++ b/local/bin/system-backup
@@ -4,10 +4,14 @@
 DIRS="/etc
 /home
 /home_hdd"
+# Name of the machine used in backup subvolumes
+MNAME=asus
 # Path where backup will be mounted
-MPATH=/media/backup-hdd
+MPATH=/media/backup
 # UUID of disk
 UUID=b162ea95-38bb-42c6-b36a-1be98c65392c
+# Mount additional arguments
+MARGS="-o compress=lzo"
 # If disk is encrypted
 CRYPT=true
 ####################################################################
@@ -25,28 +29,41 @@ if [ -z "$PART" ]; then
 	exit -1
 fi
 if $CRYPT; then
-	cryptsetup open "$PART" backup_enc || (echo Decryption failed && exit 1)
-	PART=/dev/mapper/backup_enc
+	echo -e "\e[1;33mDecrypting filesystem\e[0m"
+	# TODO what if already opened
+	cryptsetup open "$PART" backup || (echo Decryption failed && exit -2)
+	PART=/dev/mapper/backup
+	echo $PART
 fi
+echo -e "\e[1;33mMounting\e[0m"
 mkdir -p "$MPATH"
-mount "$PART" "$MPATH" || (echo Mount failed && exit 2)
+mount $MARGS "$PART" "$MPATH" || (echo Mount failed && exit -3)
+
+[ -d "$MPATH"/@"$MNAME" ] || (echo There seems to be no subvolume $MNAME && exit -4)
 
 # Do backup
 while read -r DIR; do
-	echo Backing up: $DIR
-	rdiff-backup -b --exclude-device-files --exclude-fifos --exclude-sockets \
-		--terminal-verbosity=5 --print-statistics --exclude-other-filesystems \
-		"$DIR" "$MPATH/$(basename $DIR)/"
-	rdiff-backup --remove-older-than 100D --force \
-		--terminal-verbosity=5 --print-statistics \
-		"$MPATH/$(basename $DIR)/"
+	echo -e "\e[1;33mBacking up: $DIR\e[0m"
+	rsync -a --progress "$DIR" "$MPATH"/@"$MNAME"/
 done <<< "$DIRS"
 
+# Do snapshot (read only)
+(cd "$MPATH"; btrfs subvolume snapshot -r @asus @asus-$(date -u +%y%m%d))
+
+# Remove snapshots older than 2 months
+# TODO ensure that at least five stays
+(cd "$MPATH"
+for s in @"$MNAME"-*; do
+	if [ $(expr $(date +%s) - $(stat -c %Y "$s")) -gt 5529600 ]; then
+		btrfs subvolume delete "$s"
+	fi
+done)
+
 # Unmount disk
-sync
-umount "$MPATH" || (echo Unmount failed. Unmount by hand. && exit 3)
+sync -f "$MPATH"/@"$MNAME"
+umount "$MPATH" || (echo Unmount failed. Unmount by hand. && exit -5)
 if $CRYPT; then
-	cryptsetup close backup_enc
+	cryptsetup close backup_enc || (echo Encryption close failed. Do by hand. && exit -6)
 fi
 
 # Store when we did last backup and update i3blocks status
@@ -54,4 +71,4 @@ date +"%s" > /home/cynerd/.backup_date
 pkill -RTMIN+13 i3blocks
 
 echo
-echo Backup finished
+echo -e "\e[1;34mBackup finished\e[0m"
-- 
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