Don't let the kernel parameters override the subvol for the snapshot (#85)

Previously, the kernel parameters came after the `rootflags=subvol=<snapshot>`
argument. This means that when the user's standard kernel parameters also
contain a `rootflags=subvol=<root>`, it will override the subvol flag of the
snapshot. So put the snapshot's subvol flag last.

10-update_grub.conf

@@ -1,7 +0,0 @@
-[Service]
-# Set the possible paths for `grub-mkconfig`
-Environment="PATH=/sbin:/bin:/usr/sbin:/usr/bin"
-# Load environment variables from the configuration
-EnvironmentFile=/etc/grub.d/41_snapshots-btrfs_config
-# Regenerate just '/boot/grub/grub-btrfs.cfg' if it exists, else regenerate the whole grub menu
-ExecStartPost=/bin/bash -c 'if [ -s "/boot/${GRUB_BTRFS_DIRNAME:-grub}/grub-btrfs.cfg" ]; then /etc/grub.d/41_snapshots-btrfs; else ${GRUB_BTRFS_MKCONFIG:-/usr/bin/grub-mkconfig} -o /boot/${GRUB_BTRFS_DIRNAME:-grub}/grub.cfg; fi'

41_snapshots-btrfs

@@ -6,30 +6,32 @@
 # BTC donation address: 1Lbvz244WA8xbpHek9W2Y12cakM6rDe5Rt
 # Github: https://github.com/Antynea/grub-btrfs
 #
-# Purpose: Include btrfs snapshots at boot options (grub-menu).
+# Purpose:
+#   Improves Grub by adding "btrfs snapshots" to the Grub menu.
+#   You can start your system on a "snapshot" from the Grub menu.
+#   Supports manual snapshots, snapper ...
+#   Warning : it isn't recommended to start on read-only snapshot
 #
 # What this script does:
-# Simple rollback using snapshots you made previously.
 # - Automatically List snapshots existing on root partition (btrfs).
 # - Automatically Detect if "/boot" is in separate partition.
 # - Automatically Detect kernel, initramfs and intel microcode in "/boot" directory on snapshots.
-# - Automatically Create corresponding "menuentry" in grub.cfg , which ensures a very easy rollback.
+# - Automatically Create corresponding "menuentry" in grub.cfg
 # - Automatically detect snapper and use snapper's snapshot description if available.
+# - Automatically generate grub.cfg if you use the provided systemd service.
 #
-# How to customize it:
-# - Refer 41_snapshots-btrfs_config for the list of available options and their default values.
-# - Place your configurations to either /etc/grub.d/41_snapshots-btrfs_config or /etc/default/grub.
+# Installation:
+# - Run `make install` or look into Makefile for instructions on where to put each file.
 #
-# - Generate grub.cfg (on Arch Linux use grub-mkconfig -o /boot/$grub_directory/grub.cfg)
+# Customization:
+#  Refer to config for the list of available options and their default values.
+#  Place your configurations to /etc/default/grub-btrfs/config.
 #
-# - grub-btrfs automatically generates snapshots entries.
-# - You will see it appear different entries (e.g : Snapshot: [2014-02-12 11:24:37] my snapshot name overkill)
-#
-# Automatically update grub
-#  If you would like grub to automatically update when Snapper timeline snapshots and cleanups occur, simply install 10-update_grub.conf in the following locations:
-# - /etc/systemd/system/snapper-timeline.service.d/
-# - /etc/systemd/system/snapper-cleanup.service.d/
-# Once the configuration files are in place, systemctl daemon-reload should be run to reload the units and make the changes active.
+# Automatically update Grub
+#  If you would like Grub to automatically update when a snapshots is made or deleted:
+# - Mount your subvolume which contains snapshots to /.snapshots
+# - Use systemctl start/enable grub-btrfs.path
+#  grub-btrfs.path will automatically (re)generate grub.cfg when a modification appear in /.snapshots
 #
 # Special thanks for assistance and contributions:
 # - My friends
@@ -43,15 +45,15 @@ prefix="/usr"
 exec_prefix="/usr"
 datarootdir="/usr/share"
 sysconfdir="/etc"
-grub_btrfs_config="${sysconfdir}/grub.d/41_snapshots-btrfs_config"
+grub_btrfs_config="${sysconfdir}/default/grub-btrfs/config"
 
-. "${sysconfdir}/default/grub"
 [[ -f "$grub_btrfs_config" ]] && . "$grub_btrfs_config"
 . "$datarootdir/grub/grub-mkconfig_lib"
+. "${sysconfdir}/default/grub"
 
-######################################
-### Variables in /etc/default/grub ###
-######################################
+###################################################
+### Variables in /etc/default/grub-btrfs/config ###
+###################################################
 ## Disable Grub-btrfs (default=active)
 grub_btrfs_disable=${GRUB_BTRFS_DISABLE:-"false"}
 [[ "${grub_btrfs_disable}" == "true" ]] && exit 0
@@ -98,18 +100,18 @@ export TEXTDOMAIN=grub-btrfs-git
 export TEXTDOMAINDIR="/usr/share/locale"
 ## Probe info "Boot partition"
 # Boot device
-boot_device=$(${grub_probe} --target=device "/boot")
+boot_device=$(${grub_probe} --target=device /boot)
 # hints string
-boot_hs=$(${grub_probe} --device "${boot_device}" --target="hints_string" 2>/dev/null)
+boot_hs=$(${grub_probe} --device ${boot_device} --target="hints_string" 2>/dev/null)
 # UUID of the boot partition
-boot_uuid=$(${grub_probe} --device "${boot_device}" --target="fs_uuid" 2>/dev/null)
+boot_uuid=$(${grub_probe} --device ${boot_device} --target="fs_uuid" 2>/dev/null)
 # Type filesystem of boot partition
-boot_fs=$(${grub_probe} --target="fs" "/boot" 2>/dev/null)
+boot_fs=$(${grub_probe} --target="fs" /boot 2>/dev/null)
 ## Probe info "Root partition"
 # Root device
-root_device=$(${grub_probe} --target=device "/")
+root_device=$(${grub_probe} --target=device /)
 # UUID of the root partition
-root_uuid=$(${grub_probe} --device "${root_device}" --target="fs_uuid" 2>/dev/null)
+root_uuid=$(${grub_probe} --device ${root_device} --target="fs_uuid" 2>/dev/null)
 ## Parameters passed to the kernel
 kernel_parameters="$GRUB_CMDLINE_LINUX $GRUB_CMDLINE_LINUX_DEFAULT"
 ## Mount point location
@@ -150,6 +152,7 @@ test_btrfs()
 	fi
 	set -e
 }
+
 ##############
 ### Script ###
 ##############
@@ -205,7 +208,7 @@ make_menu_entries()
 		fi
 		echo 'Loading Snapshot: "${snap_date_time}" "${snap_dir_name}"'
 		echo 'Loading Kernel: "${k}" ...'
-		linux \"${boot_dir_root_grub}/"${k}"\" root="${LINUX_ROOT_DEVICE}" rw rootflags=subvol=\""${snap_dir_name}"\" ${kernel_parameters}"
+		linux \"${boot_dir_root_grub}/"${k}"\" root="${LINUX_ROOT_DEVICE}" rw ${kernel_parameters} rootflags=subvol=\""${snap_dir_name}"\""
 				if [[ -f "${boot_dir}"/"${u}" && "${i}" != "${prefix_i}-${kversion}-${alt_suffix_i}" ]] ; then
 					entry "\
 		echo 'Loading Microcode & Initramfs: "${u}" "${i}" ...'
@@ -236,12 +239,17 @@ snapshot_list()
 {
 	# Query info from snapper if it is installed
 	type snapper >/dev/null 2>&1
-	if [[ $? -eq 0 ]]; then
-		local snapper_ids=($(snapper -t 0 -c "$snapper_config" list | tail -n +3 | cut -d'|' -f 2))
-		local snapper_types=($(snapper -t 0 -c "$snapper_config" list | tail -n +3 | cut -d'|' -f 1))
+	if [ $? -eq 0 ]; then
+		if [ -s "/etc/snapper/configs/$snapper_config" ]; then
+			printf "# Info: snapper detected, using config '$snapper_config'\n" >&2
+			local snapper_ids=($(snapper --no-dbus -t 0 -c "$snapper_config" list | tail -n +3 | cut -d'|' -f 1))
+			local snapper_types=($(snapper --no-dbus -t 0 -c "$snapper_config" list | tail -n +3 | cut -d'|' -f 2))
 
-		IFS=$'\n'
-		local snapper_descriptions=($(snapper -t 0 -c "$snapper_config" list | tail -n +3 | cut -d'|' -f 7))
+			IFS=$'\n'
+			local snapper_descriptions=($(snapper --no-dbus -t 0 -c "$snapper_config" list | tail -n +3 | rev | cut -d'|' -f 2 | rev))
+		else
+			printf "# Warning: snapper detected but config '$snapper_config' does not exist\n" >&2
+		fi
 	fi
 
 	IFS=$'\n'
@@ -298,6 +306,10 @@ snapshot_list()
 		local entry="${entries[$i]}"
 		for j in "${!snapper_ids[@]}"; do
 			local snapper_id="${snapper_ids[$j]//[[:space:]]/}"
+			# remove other non numeric characters
+			snapper_id="${snapper_id//\*/}"
+			snapper_id="${snapper_id//\+/}"
+			snapper_id="${snapper_id//-/}"
 			if [[ "$snapper_id" == "$id" ]]; then
 				local snapper_type=$(trim "${snapper_types[$j]}")
 				local snapper_description=$(trim "${snapper_descriptions[$j]}")
@@ -517,11 +529,11 @@ check_uuid_required
 if [[ "$override_boot_partition_detection" == "true" ]]; then
 	printf "# Info: Override boot partition detection : enable \n" >&2 ;
 	boot_separate
-	else
+else
 	if [[ "$root_uuid" != "$boot_uuid" ]]; then
 		printf "# Info: Separate boot partition detected \n" >&2 ;
 		boot_separate
-		else
+	else
 		printf "# Info: Separate boot partition not detected \n" >&2 ;
 		boot_bounded
 	fi
@@ -543,7 +555,7 @@ root_grub="$(make_system_path_relative_to_its_root /boot/$grub_directory)"
 # Make a submenu in GRUB (grub.cfg)
 cat << EOF
 submenu '${submenuname}' {
-	configfile "${root_grub}/grub-btrfs.cfg"
+	configfile "\${prefix}/grub-btrfs.cfg"
 }
 EOF
 printf "###### - Grub-btrfs: Snapshot detection ended   - ######\n" >&2 ;

41_snapshots-btrfs_config

@@ -1,19 +0,0 @@
-#!/usr/bin/env bash
-
-# GRUB_BTRFS_SUBMENUNAME="Arch Linux snapshots"                              # Name appearing in the Grub menu
-# GRUB_BTRFS_PREFIXENTRY="Snapshot:"                                         # Add a name ahead your snapshots entries in the Grub menu
-# GRUB_BTRFS_DISPLAY_PATH_SNAPSHOT="true"                                    # Show full path snapshot or only name in the Grub menu
-# GRUB_BTRFS_TITLE_FORMAT="p/d/n"                                            # Custom title, shows/hides p"prefix" d"date" n"name" in the Grub menu, separator "/", custom order available
-# GRUB_BTRFS_LIMIT="50"                                                      # Limit the number of snapshots populated in the GRUB menu
-# GRUB_BTRFS_SUBVOLUME_SORT="descending"                                     # Sort the found subvolumes by newest first ("descending") or oldest first ("ascending") and show $GRUB_BTRFS_LIMIT first entries.
-# GRUB_BTRFS_SHOW_SNAPSHOTS_FOUND="true"                                     # Show snapshots found during run "grub-mkconfig"
-# GRUB_BTRFS_SHOW_TOTAL_SNAPSHOTS_FOUND="true"                               # Show Total of snapshots found during run "grub-mkconfig"
-# GRUB_BTRFS_NKERNEL=("vmlinuz-linux")                                       # Use only if you have custom kernel name
-# GRUB_BTRFS_NINIT=("initramfs-linux.img" "initramfs-linux-fallback.img")    # Use only if you have custom initramfs name
-# GRUB_BTRFS_INTEL_UCODE=("intel-ucode.img")                                 # Use only if you have custom intel-ucode
-# GRUB_BTRFS_IGNORE_SPECIFIC_PATH=("var/lib/docker")                         # Ignore specific path during run "grub-mkconfig"
-# GRUB_BTRFS_SNAPPER_CONFIG="root"                                           # Snapper's config name to use
-# GRUB_BTRFS_DISABLE="false"                                                 # Disable Grub-btrfs
-# GRUB_BTRFS_DIRNAME=grub                                                    # Might be grub2 on some systems ex. /boot/grub2/...
-# GRUB_BTRFS_OVERRIDE_BOOT_PARTITION_DETECTION="false"                       # Change to "true" if you have a boot partition in a different subvolume
-# GRUB_BTRFS_MKCONFIG=grub-mkconfig                                          # Might be 'grub2-mkconfig' on some systems

Makefile

@@ -0,0 +1,14 @@
+PKGNAME ?= grub-btrfs
+PREFIX ?= /usr
+
+SHARE_DIR = $(DESTDIR)$(PREFIX)/share
+LIB_DIR = $(DESTDIR)$(PREFIX)/lib
+
+.PHONY: install
+
+install:
+	@install -Dm755 -t "$(DESTDIR)/etc/grub.d/" 41_snapshots-btrfs
+	@install -Dm644 -t "$(DESTDIR)/etc/default/grub-btrfs/" config
+	@install -Dm644 -t "$(LIB_DIR)/systemd/system/" grub-btrfs.service
+	@install -Dm644 -t "$(LIB_DIR)/systemd/system/" grub-btrfs.path
+	@install -Dm644 -t "$(SHARE_DIR)/licenses/$(PKGNAME)/" LICENSE

README.md

@@ -1,125 +1,143 @@
-[![GitHub release](https://img.shields.io/github/release/Antynea/grub-btrfs.svg)](https://github.com/Antynea/grub-btrfs)
-  
+[![GitHub release](https://img.shields.io/github/release/Antynea/grub-btrfs.svg)](https://github.com/Antynea/grub-btrfs/releases)
+![](https://img.shields.io/github/license/Antynea/grub-btrfs.svg)
+
 ## grub-btrfs
 
-This is a version 3.xx of grub-btrfs
-##### BTC donation address: 1Lbvz244WA8xbpHek9W2Y12cakM6rDe5Rt
+This is a version 4.xx of grub-btrfs
+##### BTC donation address: `1Lbvz244WA8xbpHek9W2Y12cakM6rDe5Rt`
 ##
 ### Description
+Improves Grub by adding "btrfs snapshots" to the Grub menu.
 
-grub-btrfs, Include btrfs snapshots at boot options. (grub menu)
+You can start your system on a "snapshot" from the Grub menu.
+
+Supports manual snapshots, snapper, timeshift ...
+
+##### Warning : it isn't recommended to start on read-only snapshot
 ##
-### What does grub-btrfs v3.xx do :
-
-Simple rollback using snapshots you made previously.
-
+### What does grub-btrfs v4.xx do :
 * Automatically List snapshots existing on root partition (btrfs).
-
 * Automatically Detect if "/boot" is in separate partition.
-
 * Automatically Detect kernel, initramfs and intel microcode in "/boot" directory on snapshots.
-
-* Automatically Create corresponding "menuentry" in grub.cfg , which ensures a very easy rollback.
-
+* Automatically Create corresponding "menuentry" in `grub.cfg`
 * Automatically detect snapper and use snapper's snapshot description if available.
+* Automatically generate `grub.cfg` if you use the provided systemd service.
 ##
-### How to customize it:
+### Installation :
+#### Arch Linux
 
-You have the possibility to modify many parameters.
-Add this lines to /etc/default/grub:
+```
+pacman -S grub-btrfs
+```
+
+### Manual
+
+* Run `make install` or look into Makefile for instructions on where to put each file.
+
+NOTE: Generate your Grub menu after installation for the changes to take effect.
+
+On Arch Linux use `grub-mkconfig -o /boot/grub/grub.cfg`.
+
+##
+### Customization:
+
+You have the possibility to modify many parameters in `/etc/default/grub-btrfs/config`.
 
 * GRUB_BTRFS_SUBMENUNAME="Arch Linux Snapshots"
 
-	(Name menu appearing in grub.)
+	Name appearing in the Grub menu.
 
 * GRUB_BTRFS_PREFIXENTRY="Snapshot:"
 
-	(Add a name ahead your snapshots entries.)
+	Add a name ahead your snapshots entries in the Grub menu.
 	
 * GRUB_BTRFS_DISPLAY_PATH_SNAPSHOT="true"
 	
-	(Show full path snapshot or only name, weird reaction with snapper)
+	Show full path snapshot or only name in the Grub menu, weird reaction with snapper.
 	
 * GRUB_BTRFS_TITLE_FORMAT="p/d/n"
 
- 	(Custom title, shows/hides p"prefix" d"date" n"name" in grub-menu, separator "/", custom order available)
-
-* GRUB_BTRFS_NKERNEL=("kernel-custom")
-
-	(Use it only if you have a custom kernel name)
-
-* GRUB_BTRFS_NINIT=("initramfs-custom.img" "initrd.img-custom")
-
-	(Use it only if you have a custom initramfs name)
-
-* GRUB_BTRFS_INTEL_UCODE=("intel-ucode.img")
-
-	(Use it only if you have custom intel-ucode)
+ 	Custom title, shows/hides p"prefix" d"date" n"name" in the Grub menu, separator "/", custom order available.
 
 * GRUB_BTRFS_LIMIT="50"
 
-	(Limit the number of snapshots populated in the GRUB menu.)
+	Limit the number of snapshots populated in the GRUB menu.
 
 * GRUB_BTRFS_SUBVOLUME_SORT="descending"
 
-	(Sort the found subvolumes by newest first ("descending") or oldest first ("ascending"). 
-	If "ascending" is chosen then the $GRUB_BTRFS_LIMIT oldest
-	subvolumes will populate the menu.)
+	Sort the found subvolumes by newest first ("descending") or oldest first ("ascending"). 
+	
+	If "ascending" is chosen then 
+	
+	the $GRUB_BTRFS_LIMIT oldest subvolumes will populate the menu.
 
 * GRUB_BTRFS_SHOW_SNAPSHOTS_FOUND="true"
 	
-	(Show snapshots found during run "grub-mkconfig") 
+	Show snapshots found during run "grub-mkconfig".
 	
 * GRUB_BTRFS_SHOW_TOTAL_SNAPSHOTS_FOUND="true"
 	
-	(Show Total number of snapshots found during run "grub-mkconfig")
+	Show Total number of snapshots found during run "grub-mkconfig".
+
+* GRUB_BTRFS_NKERNEL=("kernel-custom")
+
+	Use it only if you have a custom kernel name
+
+* GRUB_BTRFS_NINIT=("initramfs-custom.img" "initrd.img-custom")
+
+	Use it only if you have a custom initramfs name.
+
+* GRUB_BTRFS_INTEL_UCODE=("intel-ucode.img")
+
+	Use it only if you have custom intel-ucode.
 
 * GRUB_BTRFS_IGNORE_SPECIFIC_PATH=("var/lib/docker")
 
-	(Ignore specific path during run "grub-mkconfig")
+	Ignore specific path during run "grub-mkconfig".
+	
+	For example: 
+	
+	If path is a directory `# Found Snapshot: 2016-03-31 10:24:41` **var/lib/docker/btrfs/subvolumes/...**
+	
+	use : `GRUB_BTRFS_IGNORE_SPECIFIC_PATH=("var/lib/docker")`
+	
+	If path is a subvolume : `# Found Snapshot: 2016-03-31 10:24:41` **@var/lib/docker/btrfs/subvolumes/...**
+	
+	use : `GRUB_BTRFS_IGNORE_SPECIFIC_PATH=("@var/lib/docker")`
+	
+	You can combine them
+	
+	use : `GRUB_BTRFS_IGNORE_SPECIFIC_PATH=("@var/lib/docker" "var/lib/docker")`
+
 
 * GRUB_BTRFS_SNAPPER_CONFIG="root"													
 
-	(Snapper's config name to use)
+	Snapper's config name to use.
 
-* GRUB_BTRFS_DISABLE="true"
+* GRUB_BTRFS_DISABLE="false"
 
-	(Disable grub-btrfs)
+	Disable grub-btrfs.
 
 * GRUB_BTRFS_DIRNAME="grub"
 
-	(Name of the grub folder on /boot/)
+	Name of the grub folder in `/boot/`, might be grub2 on some distributions.
 
 * GRUB_BTRFS_OVERRIDE_BOOT_PARTITION_DETECTION="false"
-	(Change to "true" if you have a boot partition in a different subvolume)
+
+	Change to "true" if you have a boot partition in a different subvolume.
 
 * GRUB_BTRFS_MKCONFIG=grub-mkconfig
 
-    (Name or path of the 'grub-mkconfig' executable; this is 'grub2-mkconfig' on some systems)
-
-Generate grub.cfg (on Arch linux use grub-mkconfig -o /boot/grub/grub.cfg )
-
-grub-btrfs automatically generates snapshots entries.
-
-You will see it appear differents entries (e.g : Snapshot: 2018-01-03 15:08:41  @test1 )
+	Name or path of the 'grub-mkconfig' executable; might be 'grub2-mkconfig' on some distributions.
+	
 ##
 ### Automatically update grub
-
-If you would like grub to automatically update when Snapper timeline snapshots and cleanups occur, simply install `10-update_grub.conf` in the following locations:
-
-- `/etc/systemd/system/snapper-timeline.service.d/`
-- `/etc/systemd/system/snapper-cleanup.service.d/`
-
-Or copy `grub-btrfs.path` and `grub-btrfs.service` to `/etc/systemd/system/`
-
-Once the configuration files are in place, `systemctl daemon-reload` should be run to reload the units and make the changes active.
-
-##
-### Discussion
-Pour les francophones : https://forums.archlinux.fr/viewtopic.php?f=18&t=17177
+If you would like Grub to automatically update when a snapshot is made or deleted:
+* Mount your subvolume which contains snapshots to `/.snapshots`
+* Use `systemctl start/enable grub-btrfs.path`
+* `grub-btrfs.path` automatically (re)generates `grub.cfg` when a modification appears in `/.snapshots`
 ##
 ### Special thanks for assistance and contributions
-
 * [maximbaz](https://github.com/maximbaz)
 * [crossroads1112](https://github.com/crossroads1112)
 * [penetal](https://github.com/penetal)

config

@@ -0,0 +1,76 @@
+#!/usr/bin/env bash
+
+# Name appearing in the Grub menu
+# Default: "Arch Linux snapshots"
+#GRUB_BTRFS_SUBMENUNAME="Arch Linux snapshots"
+
+# Add a name ahead your snapshots entries in the Grub menu
+# Default: "Snapshot:"
+#GRUB_BTRFS_PREFIXENTRY="Snapshot:"
+
+# Show full path snapshot or only name in the Grub menu
+# Default: "true"
+#GRUB_BTRFS_DISPLAY_PATH_SNAPSHOT="true"
+
+# Custom title
+# shows/hides p"prefix" d"date" n"name" in the Grub menu, separator "/", custom order available
+# Default: "p/d/n"
+#GRUB_BTRFS_TITLE_FORMAT="p/d/n"
+
+# Limit the number of snapshots populated in the GRUB menu
+# Default: "50"
+#GRUB_BTRFS_LIMIT="50"
+
+# Sort the found subvolumes by newest first ("descending") or oldest first ("ascending") and show $GRUB_BTRFS_LIMIT first entries.
+# Default: "descending"
+#GRUB_BTRFS_SUBVOLUME_SORT="descending"
+
+# Show snapshots found during run "grub-mkconfig"
+# Default: "true"
+#GRUB_BTRFS_SHOW_SNAPSHOTS_FOUND="true"
+
+# Show Total of snapshots found during run "grub-mkconfig"
+# Default: "true"
+#GRUB_BTRFS_SHOW_TOTAL_SNAPSHOTS_FOUND="true"
+
+# Use only if you have custom kernel name
+# Default:
+#GRUB_BTRFS_NKERNEL=("vmlinuz-linux")
+
+# Use only if you have custom initramfs name
+# Default:
+#GRUB_BTRFS_NINIT=("initramfs-linux.img" "initramfs-linux-fallback.img")
+
+# Use only if you have custom intel-ucode
+# Default:
+#GRUB_BTRFS_INTEL_UCODE=("intel-ucode.img")
+
+# Ignore specific path during run "grub-mkconfig".
+# If path is a directory, # Found Snapshot: 2016-03-31 10:24:41 var/lib/docker/btrfs/subvolumes/...
+# use : GRUB_BTRFS_IGNORE_SPECIFIC_PATH=("var/lib/docker");
+# If path is a subvolume, # Found Snapshot: 2016-03-31 10:24:41 @var/lib/docker/btrfs/subvolumes/...
+# use : GRUB_BTRFS_IGNORE_SPECIFIC_PATH=("@var/lib/docker");
+# You can combine them
+# use : GRUB_BTRFS_IGNORE_SPECIFIC_PATH=("@var/lib/docker" "var/lib/docker")
+# Default: 
+GRUB_BTRFS_IGNORE_SPECIFIC_PATH=("var/lib/docker" "@var/lib/docker")
+
+# Snapper's config name to use
+# Default: "root"
+#GRUB_BTRFS_SNAPPER_CONFIG="root"
+
+# Disable Grub-btrfs
+# Default: "false"
+#GRUB_BTRFS_DISABLE="false"
+
+# Change to "true" if you have a boot partition in a different subvolume
+# Default: "false"
+#GRUB_BTRFS_OVERRIDE_BOOT_PARTITION_DETECTION="false"
+
+# Might be grub2 on some systems ex. /boot/grub2/...
+# Default: "grub"
+#GRUB_BTRFS_DIRNAME="grub"
+
+# Might be 'grub2-mkconfig' on some systems
+# Default: /usr/bin/grub-mkconfig
+#GRUB_BTRFS_MKCONFIG=/usr/bin/grub2-mkconfig

grub-btrfs.service

@@ -6,6 +6,6 @@ Type=oneshot
 # Set the possible paths for `grub-mkconfig`
 Environment="PATH=/sbin:/bin:/usr/sbin:/usr/bin"
 # Load environment variables from the configuration
-EnvironmentFile=/etc/grub.d/41_snapshots-btrfs_config
+EnvironmentFile=/etc/default/grub-btrfs/config
 # Regenerate just '/boot/grub/grub-btrfs.cfg' if it exists and is not empty, else regenerate the whole grub menu
 ExecStart=/bin/bash -c 'if [ -s "/boot/${GRUB_BTRFS_DIRNAME:-grub}/grub-btrfs.cfg" ]; then /etc/grub.d/41_snapshots-btrfs; else ${GRUB_BTRFS_MKCONFIG:-/usr/bin/grub-mkconfig} -o /boot/${GRUB_BTRFS_DIRNAME:-grub}/grub.cfg; fi'