UPD btrfs-snapshot script

btrfs-snapshot/btrfs-snapshot

@@ -0,0 +1,151 @@
+#!/bin/bash
+# By Thomas KUSCHEL <oe1tkt@gmail.com>
+# MIT License 2015
+VERSION="v6.15"
+set -o errexit # to make script exit when a command fails / a.k.a. set -e
+# then add "|| true" to commands that you allow to fail.
+set -o nounset # to exit when script tries to use undeclared variables / set -u
+# set -o xtrace  # to trace when gets executed for debugging / a.k.a. set -x
+set -o pipefail
+SCRIPTNAME=${0##*/}
+SCRIPTPATH=$(dirname "$0")
+# echo $SCRIPTNAME
+# where the btrfs is found (use command: which btrfs)
+WHICH="/usr/bin/which"
+BTRFS_ALT="/sbin/btrfs"
+BTRFS="/usr/local/bin/btrfs"
+# Function to install this script:
+installation() {
+# you have to switch to administrator
+#`${WHICH} ${PATHINSTALL}`
+PATHINSTALL="/usr/local/bin"
+SNAPSYSTEMDCFG="/etc/systemd/system/"
+SCRIPTPATH=$(dirname "$0")
+# echo "Installation of ${SCRIPTNAME} to ${PATHINSTALL} and create systemd timer/service examples in ${SNAPSYSTEMDCFG}"
+read -n 1 -p "Install ${SCRIPTNAME} to ${PATHINSTALL}? [Y/n] " reply;
+ if [ "$reply" != "" ]; then echo; fi
+ if [ "$reply" = "${reply#[Nn]}" ]; then
+  sudo cp $0 ${PATHINSTALL}/${SCRIPTNAME}
+ fi
+ read -n 1 -p "Do you want to create systemd timer/service examples in ${SNAPSYSTEMDCFG}? [Y/n] " reply;
+ if [ "$reply" != "" ]; then echo; fi
+ if [ "$reply" = "${reply#[Nn]}" ]; then
+  sudo cp -a ${SCRIPTPATH}/system/. ${SNAPSYSTEMDCFG}.
+  path=`$WHICH $SCRIPTNAME`
+ fi
+}
+
+deinstallation() {
+PATHINSTALL="/usr/local/bin"
+read -n 1 -p "Do you want to remove (deinstallation) of ${SCRIPTNAME} in ${PATHINSTALL}? [Y/n] " reply;
+ if [ "$reply" != "" ]; then echo; fi
+ if [ "$reply" = "${reply#[Nn]}" ]; then
+  sudo rm -f ${PATHINSTALL}/${SCRIPTNAME}
+ fi
+}
+
+# Function to display usage:
+usage() {
+path=`${WHICH} ${SCRIPTNAME}` || installation
+if [ -z "${path}" ] ; then
+	path="/usr/local/bin/"
+	echo "Please install $SCRIPTNAME to \"$path\""
+	path="${path}${SCRIPTNAME}"
+fi
+cat <<EOF
+$SCRIPTNAME: Take and rotate snapshots on a btrfs file system
+
+usage: $SCRIPTNAME [--version] source target snap_name count [-q]
+  source:    path to make snaphots of
+  target:    snapshot directory
+  snap_name: Base name for snapshots, to be appended to
+             date "+%F-%H%M"
+  count:     Number of snapshots in the timestamp-@snap_name format to
+             keep at one time for a given snap_name.
+  [-q]:      Be quiet.
+  --install: Force a new installation of this script.
+  --version: Print the version of this script,
+             additionally the version of btrfs-progs.
+
+Example for crontab:
+15,30,45 * * * *  root $0 /home /snap quarterly 4 -q
+0        * * * *  root $0 /home /snap hourly 8 -q
+
+Example for anacrontab:
+1        15 daily_snap   $0 /home /snap daily 8
+7        17 weekly_snap  $0 /home /snap weekly 5
+@monthly 19 monthly_snap $0 /home /snap monthly 3
+
+NEW: If you are using systemd on your linux system, see http://f0x.at/btrfs
+EOF
+ exit
+}
+if [ ! -f "$BTRFS" ] ; then
+	if [ -f "$BTRFS_ALT" ] ; then
+		# fallback
+		BTRFS="$BTRFS_ALT"
+	else
+		echo "$BTRFS system file not found,"
+		echo "please install btrfs-progs:"
+		echo "Arch Linux:    # sudo pacman -S btrfs-progs"
+		echo "Debian/Ubuntu: # sudo apt-get install btrfs-tools"
+		exit
+	fi
+fi
+# Basic argument checks:
+if [ $# -gt 0 ] && [ "x$1" == "x--version" ] ; then
+	echo "$SCRIPTNAME $VERSION"
+	echo `$BTRFS --version`
+	exit
+fi
+if [ $# -gt 0 ] && [ "x$1" == "x--install" ] ; then
+	installation
+	exit
+fi
+if [ $# -gt 0 ] && [ "x$1" == "x--deinstall" ] ; then
+	deinstallation
+	exit
+fi
+
+# Check count of arguments
+if [ "$#" -ge 4 ]; then
+	SOURCE=$1
+	TARGET=$2
+	SNAP=$3
+	COUNT=$4
+	QUIET=""
+	if [ "$#" -gt 4 ]; then
+		QUIET=$5
+	fi
+else
+	echo "You need some arguments."
+	usage
+fi
+if [ $# -gt 5 ] ; then
+    echo "Too many parameters."
+    usage
+fi
+if [ -n "$QUIET" ] && [ "x$QUIET" != "x-q"  ] ; then
+    echo "Parameter 4 is either -q or empty. Given: \"$QUIET\""
+    usage
+fi
+# $max_snap is the highest number of snapshots that will be kept for $SNAP.
+max_snap=$(($COUNT -1))
+
+# Check if $TARGET already exists - if NOT then create subdir
+[ -d $TARGET ] || mkdir $TARGET
+
+# Clean up older snapshots:
+for i in `ls $TARGET|sort |grep @${SNAP}|head -n -${max_snap}`; do
+	cmd="$BTRFS subvolume delete $TARGET/$i"
+	if [ -z $QUIET ]; then
+		echo $cmd
+	fi
+	$cmd >/dev/null
+done
+# Create new snapshot:
+cmd="$BTRFS subvolume snapshot -r $SOURCE $TARGET/`date "+%F-%H%M-@${SNAP}"`"
+if [ -z $QUIET ]; then
+	echo $cmd
+fi
+$cmd >/dev/null

btrfs-snapshot/system/snapshot_home_user_daily.service

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+[Unit]
+Description=rolling snapshot for /home/user
+[Service]
+Type=oneshot
+Nice=19
+IOSchedulingClass=best-effort
+IOSchedulingPriority=7
+ExecStart=/usr/local/bin/btrfs-snapshot /home/user /home/snap/user daily 4

btrfs-snapshot/system/snapshot_home_user_daily.timer

@@ -0,0 +1,9 @@
+[Unit]
+Description=daily snapshot
+[Timer]
+# see systemd.time(7) manual page for other scheduling options
+OnCalendar=01:00
+# run immediately if we missed a backup for some reason
+Persistent=true
+[Install]
+WantedBy=timers.target