commit 94710167395197879bb0004e0c05b5ca915c9eb7
Author: Willi Mutschler <willi@mutschler.eu>
Date:   Wed Apr 29 09:59:11 2020 +0200

    Initial fork of timeshift-autosnap
    
    Forked timeshift-autosnap to work in Ubuntu-based distros, updated README and LICENSE

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+
+\.directory
+
+aur/
diff --git a/80-timeshift-autosnap-apt b/80-timeshift-autosnap-apt
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+DPkg::Pre-Invoke {"/usr/bin/timeshift-autosnap-apt"; };
diff --git a/LICENSE b/LICENSE
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+MIT License
+
+Copyright (c) 2019 gobonja
+Copyright (c) 2020 Willi Mutschler (wmutschl, willi@mutschler.eu)
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/README.md b/README.md
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+# timeshift-autosnap-apt
+Timeshift auto-snapshot script which runs before `apt upgrade|install|remove` using a `DPkg::Pre-Invoke` hook in apt.
+
+## Features
+*  This scrips is a fork of [timeshift-autosnap](https://gitlab.com/gobonja/timeshift-autosnap) from the [AUR](https://aur.archlinux.org/cgit/aur.git/tree/PKGBUILD?h=timeshift-autosnap) for Arch and Arch based distros but adapted for usage in Debian based systems which use apt as their package manager.
+*  Creates [Timeshift](https://github.com/teejee2008/timeshift) snapshots with unique comment.
+*  Deletes old snapshots which are created using this script.
+*  Can be manually executed by running `sudo timeshift-autosnap-apt` command.
+*  Autosnaphot can be temporarily skipped by setting SKIP_AUTOSNAP environment variable (e.g. `sudo SKIP_AUTOSNAP= apt upgrade`)
+*  Supports both `BTRFS` and `RSYNC` mode.
+*  For a tutorial how to use this script in production to easily rollback your system, see [Pop!_OS 20.04 btrfs-luks disaster recovery and easy system rollback using Timeshift and timeshift-autosnap-apt](https://mutschler.eu/linux/install-guides/pop-os-btrfs-recovery/).
+
+## Installation
+If you haven't, first install Timeshift:
+```bash
+sudo apt install timeshift
+```
+Open Timeshift and configure it either using btrfs or rsync. I recommend using btrfs as a filesystem for this, see my [btrfs installation guides](https://mutschler.eu/linux/install-guides/) for Pop!_OS, Ubuntu, and Manjaro.
+
+Clone the repository and run the following commands to copy the hook, bash script and configuration file.
+```bash
+git clone https://github.com/wmutschl/timeshift-autosnap-apt.git
+cd timeshift-autosnap-apt
+sudo cp 80-timeshift-autosnap-apt /etc/apt/apt.conf.d/80-timeshift-autosnap-apt
+sudo chmod 644 /etc/apt/apt.conf.d/80-timeshift-autosnap-apt
+sudo cp timeshift-autosnap-apt /usr/bin/timeshift-autosnap-apt
+sudo chmod 755 /usr/bin/timeshift-autosnap-apt
+sudo cp timeshift-autosnap-apt.conf /etc/timeshift-autosnap-apt.conf
+sudo chmod 644 /etc/timeshift-autosnap-apt.conf
+```
+After this, optionally, make changes to the configuration file:
+```bash
+sudo nano /etc/timeshift-autosnap-apt.conf
+```
+
+## Configuration
+The configuration file is located in `/etc/timeshift-autosnap-apt.conf`. You can set the following options:
+*  `skipAutosnap`: If set to **true** script won't be executed. Default: **false**.
+*  `deleteSnapshots`: If set to **false** old snapshots won't be deleted. Default: **true**
+*  `maxSnapshots`: Defines **maximum** number of old snapshots to keep. Default: **3**
+*  `snapshotDescription` Defines **value** used to distinguish snapshots created using timeshift-autosnap-apt. Default: **{timeshift-autosnap-apt} {created before upgrade}**
+
+
+## Test functionality
+To test the functionality, try (re)installing some package `maxSnapshots` number of times, e.g.
+```bash
+sudo apt install --reinstall rolldice
+sudo apt install --reinstall rolldice
+sudo apt install --reinstall rolldice
+```
+You should see output for BTRFS similar to
+```bash
+# Using system disk as snapshot device for creating snapshots in BTRFS mode
+#
+# /dev/dm-1 is mounted at: /run/timeshift/backup, options: rw,relatime,compress=zstd:3,ssd,space_cache,commit=120,subvolid=5,subvol=/
+#
+# Creating new backup...(BTRFS)
+# Saving to device: /dev/dm-1, mounted at path: /run/timeshift/backup
+# Created directory: /run/timeshift/backup/timeshift-btrfs/snapshots/2020-04-29_09-46-30
+# Created subvolume snapshot: /run/timeshift/backup/timeshift-btrfs/snapshots/2020-04-29_09-46-30/@
+# Created subvolume snapshot: /run/timeshift/backup/timeshift-btrfs/snapshots/2020-04-29_09-46-30/@home
+# Created control file: /run/timeshift/backup/timeshift-btrfs/snapshots/2020-04-29_09-46-30/info.json
+# BTRFS Snapshot saved successfully (0s)
+# Tagged snapshot '2020-04-29_09-46-30': ondemand
+# --------------------------------------------------------------------------
+```
+or for RSYNC similar to
+```bash
+# /dev/vdb1 is mounted at: /run/timeshift/backup, options: rw,relatime
+# ------------------------------------------------------------------------------
+# Creating new snapshot...(RSYNC)
+# Saving to device: /dev/vdb1, mounted at path: /run/timeshift/backup
+# Synching files with rsync...
+# Created control file: /run/timeshift/backup/timeshift/snapshots/2020-04-29_10-25-35/info.json
+# RSYNC Snapshot saved successfully (6s)
+# Tagged snapshot '2020-04-29_10-25-35': ondemand
+------------------------------------------------------------------------------
+```
+
+Open timeshift and see whether there are `maxSnapshots` packages:
+![Timeshift](timeshift-autosnap-apt.png)
+
+Close timeshift and reinstall the package another time and you should see that the first package is now deleted:
+```bash
+sudo apt install --reinstall rolldice
+#
+# Using system disk as snapshot device for creating snapshots in BTRFS mode
+# /dev/dm-1 is mounted at: /run/timeshift/backup, options: rw,relatime,compress=zstd:3,ssd,space_cache,commit=120,subvolid=5,subvol=/
+# Creating new backup...(BTRFS)
+# Saving to device: /dev/dm-1, mounted at path: /run/timeshift/backup
+# Created directory: /run/timeshift/backup/timeshift-btrfs/snapshots/2020-04-29_09-53-25
+# Created subvolume snapshot: /run/timeshift/backup/timeshift-btrfs/snapshots/2020-04-29_09-53-25/@
+# Created subvolume snapshot: /run/timeshift/backup/timeshift-btrfs/snapshots/2020-04-29_09-53-25/@home
+# Created control file: /run/timeshift/backup/timeshift-btrfs/snapshots/2020-04-29_09-53-25/info.json
+# BTRFS Snapshot saved successfully (0s)
+# Tagged snapshot '2020-04-29_09-53-25': ondemand
+# ------------------------------------------------------------------------------
+# 
+# /dev/dm-1 is mounted at: /run/timeshift/backup, options: rw,relatime,compress=zstd:3,ssd,space_cache,commit=120,subvolid=5,subvol=/
+# 
+# ------------------------------------------------------------------------------
+# Removing snapshot: 2020-04-29_09-46-30
+# Deleting subvolume: @home (Id:662)
+# Deleted subvolume: @home (Id:662)
+# 
+# Destroying qgroup: 0/662
+# Destroyed qgroup: 0/662
+# 
+# Deleting subvolume: @ (Id:661)
+# Deleted subvolume: @ (Id:661)
+# 
+# Destroying qgroup: 0/661
+# Destroyed qgroup: 0/661
+# 
+# Deleted directory: /run/timeshift/backup/timeshift-btrfs/snapshots/2020-04-29_09-46-30
+# Removed snapshot: 2020-04-29_09-46-30
+# ------------------------------------------------------------------------------
+```
+or for RSYNC:
+
+```bash
+# /dev/vdb1 is mounted at: /run/timeshift/backup, options: rw,relatime
+# 
+# ------------------------------------------------------------------------------
+# Creating new snapshot...(RSYNC)
+# Saving to device: /dev/vdb1, mounted at path: /run/timeshift/backup
+# Linking from snapshot: 2020-04-29_10-25-15
+# Synching files with rsync...
+# Created control file: /run/timeshift/backup/timeshift/snapshots/2020-04-29_10-25-35/info.json
+# RSYNC Snapshot saved successfully (6s)
+# Tagged snapshot '2020-04-29_10-25-35': ondemand
+# ------------------------------------------------------------------------------
+# 
+# /dev/vdb1 is mounted at: /run/timeshift/backup, options: rw,relatime
+# 
+# ------------------------------------------------------------------------------
+# Removing '2020-04-29_10-24-35'...
+# Removed '2020-04-29_10-24-35'                                                   
+# ------------------------------------------------------------------------------
+```
+
+## Ideas and contributions
+- [x] Ask to be included into official Timeshift package, [status pending](https://github.com/teejee2008/timeshift/issues/595).
+- [ ] Add systemd-boot entry to boot into automatically generated snapshots (test on Pop!_OS)
+- [ ] Add grub boot entry to boot into automatically generated snapshots, similar to ARCH package [grub-btrfs](https://github.com/Antynea/grub-btrfs) (test on Ubuntu)
+
+**All new ideas and contributors are welcomed, just open an issue for that!**
+
diff --git a/timeshift-autosnap-apt b/timeshift-autosnap-apt
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+#!/bin/bash
+#original author: gobonja
+#adapted for apt by Willi Mutschler (wmutschl)
+
+[ $(findmnt / -no fstype) == "overlay" ] && { echo "==> skipping timeshift-autosnap because system is booted in Live CD mode..."; exit 0; }
+
+[[ -v SKIP_AUTOSNAP ]] && { echo "==> skipping timeshift-autosnap due SKIP_AUTOSNAP environment variable being set."; exit 0; }
+
+readonly CONF_FILE=/etc/timeshift-autosnap-apt.conf
+readonly SNAPSHOTS_TO_DELETE=$(mktemp -u --tmpdir ${0##*/}.XXXXXXXX)
+
+readonly SNAPSHOT_NAME_DATE_PATTERN="[0-9]\{4\}-[0-9]\{2\}-[0-9]\{2\}_[0-9]\{2\}-[0-9]\{2\}-[0-9]\{2\}"
+
+get_property() {
+    if [ ! -f $CONF_FILE ]; then
+        echo "$CONF_FILE not found! Using $1=$3" >&2;
+        param_value=$3
+    else
+        param_value=`sed '/^\#/d' $CONF_FILE | grep $1 | tail -n 1 |\
+        cut -d "=" -f2- | sed 's/^[[:space:]]*//;s/[[:space:]]*$//'`
+
+        if ([ "$2" == "boolean" ] && [ "$param_value" != true ] && [ "$param_value" != false ]) || \
+           ([ "$2" == "integer" ] && [[ ! "$param_value" =~ ^[-+]?([1-9][[:digit:]]*|1)$ ]]) || \
+           ([ "$2" == "string" ] && [ "$param_value" == "" ]) ; then
+            echo "Wrong paramater in $CONF_FILE. Using $1=$3" >&2
+            param_value=$3
+        fi
+    fi
+
+    echo $param_value
+}
+
+if $(get_property "skipAutosnap" "boolean" "false") ; then
+    echo "==> skipping timeshift-autosnap-apt due skipAutosnap in $CONF_FILE set to TRUE." >&2; exit 0;
+fi
+
+readonly SNAPSHOT_DESCRIPTION=$(get_property "snapshotDescription" "string" "{timeshift-autosnap-apt} {created before upgrade}")
+
+timeshift --create --comments "$SNAPSHOT_DESCRIPTION" || { echo "Unable to run timeshift-autosnap-apt! Please close Timeshift and try again. Script will now exit..." >&2; exit 1; }
+
+if $(get_property "deleteSnapshots" "boolean" "true") ; then
+    timeshift --list > $SNAPSHOTS_TO_DELETE
+    sed -ni "/$SNAPSHOT_DESCRIPTION/p" $SNAPSHOTS_TO_DELETE
+    sed -ni "s/.*\($SNAPSHOT_NAME_DATE_PATTERN\).*/\1/p" $SNAPSHOTS_TO_DELETE
+
+    count=$(($(sed -n '$=' $SNAPSHOTS_TO_DELETE)-$(get_property "maxSnapshots" "integer" "3")))
+
+    if [ "$count" -gt 0 ] ; then
+        sed -i $(($count))q $SNAPSHOTS_TO_DELETE
+        
+        for snapshot in $(cat $SNAPSHOTS_TO_DELETE); do
+            timeshift --delete --snapshot $snapshot
+        done
+    fi
+fi;
+
+exit 0
diff --git a/timeshift-autosnap-apt.conf b/timeshift-autosnap-apt.conf
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+#
+# /etc/timeshift-autosnap.conf
+#
+
+# skipAutosnap defines if timeshift-autosnap execution should be skipped.
+# Default value is false.
+skipAutosnap=false
+
+# deleteSnapshots defines if old snapshots should be deleted.
+# Default value is true.
+deleteSnapshots=true
+
+# maxSnapshots defines how much old snapshots script should left.
+# Only positive whole numbers can be used.
+# Default value is 3.
+maxSnapshots=3
+
+# snapshotDescription defines value used to distinguish snapshots created using timeshift-autosnap
+# Default value is "{timeshift-autosnap} {created before upgrade}".
+snapshotDescription={timeshift-autosnap-apt} {created before upgrade}
diff --git a/timeshift-autosnap-apt.png b/timeshift-autosnap-apt.png
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