Support selecting snapper's config, default to 'root' (#41)

Update 41_snapshots-btrfs

10-update_grub.conf

@@ -0,0 +1,2 @@
+[Service]
+ExecStartPost=/usr/sbin/grub-mkconfig -o /boot/grub/grub.cfg

41_snapshots-btrfs

@@ -1,136 +1,493 @@
-#! /bin/sh
+#! /usr/bin/env bash
+#
+#
+#########################################################################################################################################################################
+# Written by: Antynea																			#
+# BTC donation address: 1Lbvz244WA8xbpHek9W2Y12cakM6rDe5Rt														#
+#																					#
+# Purpose: Include btrfs snapshots at boot options (grub-menu).														#
+#																					#
+# 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. (For custon name, see below.)						#
+# - Automatically Create corresponding "menuentry" in grub.cfg , which ensures a very easy rollback.									#
+# - Automatically detect snapper and use snapper's snapshot description if available.											#
+#																					#
+# How to use it:																			#
+# - Add this lines to /etc/default/grub:																#
+#																					#
+# * 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="100"																		#
+#	(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.)									#
+# * 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 or auto-detect failed.)												#
+# * GRUB_BTRFS_NINIT=("initramfs-linux.img" "initramfs-linux-fallback.img")												#
+#	(Use only if you have custom initramfs name or auto-detect failed.)												#
+# * GRUB_BTRFS_INTEL_UCODE=("intel-ucode.img") 																#
+#	(Use only if you have custom intel-ucode or auto-detect failed.)		    										#
+# * GRUB_BTRFS_IGNORE_SPECIFIC_PATH=("var/lib/docker" "nosnapshot")													#
+#	(Ignore specific path during run "grub-mkconfig")														#
+# * GRUB_BTRFS_CREATE_ONLY_HARMONIZED_ENTRIES="false"															#
+#	(Create entries with matching version number instead of all possible combinations of kernel and initramfs)							#
+# * GRUB_BTRFS_SNAPPER_CONFIG="root"															#
+#	(Snapper's config name to use)							#
+#																					#
+# - 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 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.					#
+#																					#
+#########################################################################################################################################################################
+
 set -e
 
-. /usr/share/grub/grub-mkconfig_lib
-. /etc/default/grub
+#prefix="/usr"
+#exec_prefix="${prefix}"
+datarootdir="/usr/share"
+#datadir="${datarootdir}"
+sysconfdir="/etc"
 
-### variables modifiable ###
-## fr: nom du sous-menu 
-## en: Name of the submenu
-submenuname="ArchLinux Snapshots"
-## fr: préfixe de l'entrée 
-## en: Prefix entry
-prefixentry="Snapshot"
-## fr: nom(s) du ou des kernel(s)
-## en: Name(s) of the kernel(s)
-nkernel=("vmlinuz-linux")
-## fr: nom(s) de(s) l'init
-## en: Name(s) of the init(s)
-ninit=("initramfs-linux.img" "initramfs-linux-fallback.img")
-## fr: nom du microcode intel
-## en: Name intel-ucode
-intel_ucode=("intel-ucode.img")
+. "${datarootdir}/grub/grub-mkconfig_lib"
+. "${sysconfdir}/default/grub"
+
+######################################
+### Variables in /etc/default/grub ###
+######################################
+## Submenu name
+submenuname=${GRUB_BTRFS_SUBMENUNAME:-"Arch Linux snapshots"}
+## Prefix entry
+prefixentry=${GRUB_BTRFS_PREFIXENTRY:-"Snapshot:"}
+## Show full path snapshot or only name
+path_snapshot=${GRUB_BTRFS_DISPLAY_PATH_SNAPSHOT:-"true"}
+## Title format
+title_format=${GRUB_BTRFS_TITLE_FORMAT:-"p/d/n"}
+## Kernel(s) name(s)
+nkernel=("${GRUB_BTRFS_NKERNEL[@]}")
+## Initramfs name(s)
+ninit=("${GRUB_BTRFS_NINIT[@]}")
+## Microcode(s) name(s)
+microcode=("${GRUB_BTRFS_INTEL_UCODE[@]}")
+## Limit to show in the Grub menu
+limit_snap_show="${GRUB_BTRFS_LIMIT:-100}"
+## How to sort snapshots list
+snap_list_sort=${GRUB_BTRFS_SUBVOLUME_SORT:-"descending"}
+case "${snap_list_sort}" in
+    ascending)          btrfssubvolsort=("--sort=+rootid");;
+    *)                  btrfssubvolsort=("--sort=-rootid")
+esac
+## Show snapshots found during run "grub-mkconfig"
+show_snap_found=${GRUB_BTRFS_SHOW_SNAPSHOTS_FOUND:-"true"}
+## Show Total of snapshots found during run "grub-mkconfig"
+show_total_snap_found=${GRUB_BTRFS_SHOW_TOTAL_SNAPSHOTS_FOUND:-"true"}
+## Ignore specific path during run "grub-mkconfig"
+ignore_specific_path=("${GRUB_BTRFS_IGNORE_SPECIFIC_PATH[@]}")
+## create only entries with harmonized version numbers
+harmonized_entries=${GRUB_BTRFS_CREATE_ONLY_HARMONIZED_ENTRIES:-"false"}
+## snapper's config name
+snapper_config=${GRUB_BTRFS_SNAPPER_CONFIG:-"root"}
 
 
-###########################
-### fr: DÉBUT DU SCRIPT ###
-### en: NAME OF SCRIPT  ###
-### fr: NE PAS TOUCHER  ###
-### en: DO NOT TOUCH    ###
-###########################
-## fr: internationalisation
-## en: Internationalization
+########################
+### variables script ###
+########################
+## Internationalization (default : english)
 export TEXTDOMAIN=grub-btrfs-git
 export TEXTDOMAINDIR="/usr/share/locale"
-## fr: paramêtre des chaînes --hint
-## en: Parameter of the chains --hint (Translation unclear)
-pboot=$(${grub_probe} --target="hints_string" "/boot" 2>/dev/null)
-## fr: uuid de la partition root
-## en: UUID of the root partition
-uuid=$(${grub_probe} "/" --target="fs_uuid" 2>/dev/null)
-## fr: uuid de la partition boot
-## en: UUID of the boot partition
-buuid=$(${grub_probe} --target="fs_uuid" "/boot" 2>/dev/null)
-## fr: paramêtre passé au kernel
-## en: Parameters passed to the kernel
-params="$GRUB_CMDLINE_LINUX $GRUB_CMDLINE_LINUX_DEFAULT"
+## hints string
+hs_boot=$(${grub_probe} --target="hints_string" "/boot" 2>/dev/null)
+## UUID of the boot partition
+boot_uuid=$(${grub_probe} --target="fs_uuid" "/boot" 2>/dev/null)
+## Type filesystem of boot partition
+boot_fs=$(${grub_probe} --target="fs" "/boot" 2>/dev/null)
+## UUID of the root partition
+root_uuid=$(${grub_probe} "/" --target="fs_uuid" 2>/dev/null)
+## Parameters passed to the kernel
+kernel_parameters="$GRUB_CMDLINE_LINUX $GRUB_CMDLINE_LINUX_DEFAULT"
+## Mount point location
+gbgmp=$(mktemp -d)
+## Class for theme
+CLASS="--class snapshots --class gnu-linux --class gnu --class os"
+## save IFS
+oldIFS=$IFS
+## boot_dir (auto-detect if /boot is separate partition or not)
+boot_dir()
+{
+	boot_dir="$gbgmp/$snap_dir_name/boot"
+	[[ "$root_uuid" != "$boot_uuid" ]] && boot_dir="/boot"
+	echo "$boot_dir"
+}
 
 
-# fr: on affiche le menu
-# en: Display the menu
-echo "submenu '$submenuname' {"
+##############
+### Script ###
+##############
 
-# fr: on traite la variable kernel
-# en: Treat the kernel variables (Translation unclear)
-for kernel in ${nkernel[@]}; do
-	# fr: on test si le(s) nom(s) du(des) kernel existe(nt), autrement on affiche une erreur et on sort
-	# en: Check the specified kernel(s) exist, if it/they don't, display an error and exit
-	if [ ! -f /boot/$kernel ]; then gettext_printf $"Error: /boot/$kernel, kernel does not exist" >&2; exit 1; fi
-	# fr: on vérifie le nombre de kernel présent, si >1 on crée un menu
-	# en: If there are >1 kernels, create a menu
-	if [ ${#nkernel[*]} != 1 ]; then echo "	submenu '$kernel' {
-		submenu '---> Kernel: $kernel <---' { echo }"; fi
-	
-	# fr: On liste les snapshots présent sur le système de fichier
-	# en: List filesystem snapshots
-	for item in $($bindir/btrfs subvolume list -s / --sort=-ogen | $bindir/awk '{print $NF}'); do
-		# fr: On écarte les snapshots avec un statut de suppression
-		# en: Discard deleted snapshots
-		if [ $item = "DELETED" ]; then continue; fi
-		# fr: affiche la liste des snapshots trouvés
-		# en: Output name of snapshot
-		gettext_printf $"Found Snapshot: %s\n" "$item" >&2
-		# fr: on crée un menu pour chaque snapshot présent (nom + date de création)
-		# en: Create a menu for remaining snapshots (name + creation date)
-		date_time=$($bindir/btrfs subvolume list -s / | $bindir/grep $item | $bindir/cut -d" " -f 11-12)
-		echo "		submenu '$prefixentry $item [$date_time]' {"
-		# fr: si plusieurs kernel on été trouvé, on affiche un titre indicatif
-		# en: if more than one kernel is found, create a menu
-		if [ ${#nkernel[*]} != 1 ]; then echo "			submenu '---> Kernel: $kernel <---' { echo }"; fi
-		# fr: on traite la variable de l'initramfs
-		# en: Treat the initramfs variables (Translation unclear)
-		for init in ${ninit[@]}; do
-			# fr: on test si le(s) nom(s) du(des) initramfs existe(nt), autrement on affiche une erreur et on sort
-			# en: Check the specified initramfs(es) exist, if it/they don't, display an error and exit
-			if [ ! -f /boot/$init ]; then gettext_printf $"Error: /boot/$init, initramfs does not exist" >&2; exit 1; fi
-			# fr: on traite chaque entrée des snapshots avec leurs kernel et initramfs respectifs
-			# en: Specify a kernel and initramfs for every snapshot
-			echo "\
-			menuentry '$item $init' --class arch --class gnu-linux --class gnu --class os "\$menuentry_id_option" 'gnulinux-snapshots-$uuid'{
-				load_video
-				set gfxpayload=$GRUB_GFXPAYLOAD_LINUX
-				if [ x"\$feature_platform_search_hint" = xy ]; then
-					search --no-floppy --fs-uuid --set=root $pboot $buuid
-				else
-					search --no-floppy --fs-uuid --set=root $buuid
-				fi
-				echo	'Loading Linux snapshot ...'"
-				# fr: on vérifie l'emplacement de la partition /boot
-				# en: Check the location of the /boot partition
-				if [ $uuid = $buuid ]; then
-					echo "\
-				linux	/$item/boot/$kernel root=UUID=$uuid rw rootflags=subvol=$item $params
-				echo    'Loading initial ramdisk ...'"
-				# fr: on vérifie la présence du microcode intel
-				# en: Check intel microcode exist
-					if [ -f /boot/$intel_ucode ]; then
-						echo "\
-				initrd	/$item/boot/$intel_ucode /$item/boot/$init"
-					else
-						echo "\
-				initrd	/$item/boot/$init"
-					fi
-				else
-					echo "\
-				linux	/$kernel root=UUID=$uuid rw rootflags=subvol=$item $params
-				echo    'Loading initial ramdisk ...'"
-				# fr: on vérifie la présence du microcode intel
-				# en: Check intel microcode exist
-				if [ -f /boot/$intel_ucode ]; then
-						echo "\
-				initrd	/$intel_ucode /$init"
-					else
-						echo "\
-				initrd  /$init"
-					fi
-				fi
+### BEGIN auto detect ###
+
+## menu entries
+snapshots_entry()
+{
+## \" required for snap,kernels,init,microcode with space in their name
+	echo "	submenu '$title_menu' {
+		submenu '---> $title_menu <---' { echo }
+	"
+	for k in "${name_kernel[@]}"; do
+		for i in "${name_initramfs[@]}"; do
+			for u in "${name_microcode[@]}"; do
+			if [ -f "$(boot_dir)"/"${u}" ] ; then
 				echo "\
-			}"
-		done
+		menuentry '"${k}" & "${i}" & "${u}"' ${CLASS} "\$menuentry_id_option" 'gnulinux-snapshots-$boot_uuid'{"
+			else 
+				echo "\
+		menuentry '"${k}" & "${i}"' ${CLASS} "\$menuentry_id_option" 'gnulinux-snapshots-$boot_uuid'{"
+			fi
+			echo "\
+			$(save_default_entry)
+			if [ x\$feature_all_video_module = xy ]; then
+				insmod all_video
+			fi
+			set gfxpayload=keep
+			insmod ${boot_fs}
+			if [ x\$feature_platform_search_hint = xy ]; then
+				search --no-floppy --fs-uuid  --set=root ${hs_boot} ${boot_uuid}
+			else
+				search --no-floppy --fs-uuid  --set=root ${boot_uuid}
+			fi
+			echo 'Loading Snapshot: "${snap_date_time}" "${snap_dir_name}"'
+			echo 'Loading Kernel: "${k}" ...'
+			linux \"${boot_dir_real_path}/"${k}"\" root=UUID=${root_uuid} rw rootflags=subvol=\""${snap_dir_name}"\" ${kernel_parameters}"
+			if [ -f "$(boot_dir)"/"${u}" ] ; then
+				echo "\
+			echo 'Loading Microcode & Initramfs: "${u}" "${i}" ...'
+			initrd \"${boot_dir_real_path}/"${u}"\" \"${boot_dir_real_path}/"${i}"\""
+			else
+				echo "\
+			echo 'Loading Initramfs: "${i}" ...'
+			initrd \"${boot_dir_real_path}/"${i}"\""
+			fi
 		echo "		}"
+			done
+		done
 	done
-	# fr: on oubli pas de fermer le menu si plusieurs kernels ont été trouvé
-	# en: Don't forget to close menus if more than one kernel is found
-	if [ ${#nkernel[*]} != 1 ]; then echo "	}"; fi
-done
-echo "}"
+	echo "	}"
+}
+
+harmonized_snapshots_entry()
+{
+## \" required for snap,kernels,init,microcode with space in their name
+	echo "	submenu '$title_menu' {
+		submenu '---> $title_menu <---' { echo }
+	"
+	for k in "${name_kernel[@]}"; do
+		version=${k#vmlinuz-}
+		i=""
+		if [ -f "$(boot_dir)"/initramfs-"${version}".img ]; then
+			i=initramfs-${version}.img
+		else
+			if [ -f "$(boot_dir)"/initrd.img-"${version}" ]; then
+				i=initrd.img-${version}
+			fi
+		fi
+		for u in "${name_microcode[@]}"; do
+			if [ -f "$(boot_dir)"/"${u}" ] ; then
+				echo "\
+		menuentry '"${k}" & "${i}" & "${u}"' ${CLASS} "\$menuentry_id_option" 'gnulinux-snapshots-$boot_uuid'{"
+			else 
+				echo "\
+		menuentry '"${k}" & "${i}"' ${CLASS} "\$menuentry_id_option" 'gnulinux-snapshots-$boot_uuid'{"
+			fi
+			echo "\
+			$(save_default_entry)
+			if [ x\$feature_all_video_module = xy ]; then
+				insmod all_video
+			fi
+			set gfxpayload=keep
+			insmod ${boot_fs}
+			if [ x\$feature_platform_search_hint = xy ]; then
+				search --no-floppy --fs-uuid  --set=root ${hs_boot} ${boot_uuid}
+			else
+				search --no-floppy --fs-uuid  --set=root ${boot_uuid}
+			fi
+			echo 'Loading Snapshot: "${snap_date_time}" "${snap_dir_name}"'
+			echo 'Loading Kernel: "${k}" ...'
+			linux \"${boot_dir_real_path}/"${k}"\" root=UUID=${root_uuid} rw rootflags=subvol=\""${snap_dir_name}"\" ${kernel_parameters}"
+			if [ -f "$(boot_dir)"/"${i}" ] ; then
+				if [ -f "$(boot_dir)"/"${u}" ] ; then
+					echo "\
+			echo 'Loading Microcode & Initramfs: "${u}" "${i}" ...'
+			initrd \"${boot_dir_real_path}/"${u}"\" \"${boot_dir_real_path}/"${i}"\""
+				else
+					echo "\
+			echo 'Loading Initramfs: "${i}" ...'
+			initrd \"${boot_dir_real_path}/"${i}"\""
+				fi
+			fi
+			echo "		}"
+		done
+	done
+	echo "	}"
+}
+
+## Trim a string from leading and trailing whitespaces
+trim() {
+	local var="$*"
+	var="${var#"${var%%[![:space:]]*}"}"
+	var="${var%"${var##*[![:space:]]}"}"
+	echo -n "$var"
+}
+
+## List of snapshots on filesystem
+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 "$snapper_config" list | tail -n +3 | cut -d'|' -f 1))
+
+		IFS=$'\n'
+		local snapper_descriptions=($(snapper -t 0 -c "$snapper_config" list | tail -n +3 | cut -d'|' -f 7))
+	fi
+
+	IFS=$'\n'
+
+	# Parse btrfs snapshots
+	local entries=()
+	local ids=()
+	local max_entry_length=0
+	for snap in $(btrfs subvolume list -sa "${btrfssubvolsort}" /); do
+		IFS=$oldIFS
+		snap=($snap)
+		local snap_path_name=${snap[@]:13:${#snap[@]}}
+		# Discard deleted snapshots
+		if [ "$snap_path_name" = "DELETED" ]; then continue; fi
+		[[ ${snap_path_name%%"/"*} == "<FS_TREE>" ]] && snap_path_name=${snap_path_name#*"/"}
+
+		local id="${snap_path_name//[!0-9]}" # brutal way to get id: remove everything non-numeric
+		ids+=("$id")
+
+		local entry="${snap[@]:10:2} | ${snap_path_name}"
+		entries+=("$entry")
+
+		# Find max length of a snapshot entry, needed for pretty formatting
+		local length="${#entry}"
+		[[ "$length" -gt "$max_entry_length" ]] && max_entry_length=$length
+	done
+
+	# Find max length of a snapshot type, needed for pretty formatting
+	local max_type_length=0
+	for id in "${ids[@]}"; do
+		for j in "${!snapper_ids[@]}"; do
+			local snapper_id="${snapper_ids[$j]//[[:space:]]/}"
+			if [[ "$snapper_id" == "$id" ]]; then
+				local snapper_type=$(trim "${snapper_types[$j]}")
+				local length="${#snapper_type}"
+				[[ "$length" -gt "$max_type_length" ]] && max_type_length=$length
+			fi
+		done
+	done
+
+	for i in "${!entries[@]}"; do
+		local id="${ids[$i]}"
+		local entry="${entries[$i]}"
+		for j in "${!snapper_ids[@]}"; do
+			local snapper_id="${snapper_ids[$j]//[[:space:]]/}"
+			if [[ "$snapper_id" == "$id" ]]; then
+				local snapper_type=$(trim "${snapper_types[$j]}")
+				local snapper_description=$(trim "${snapper_descriptions[$j]}")
+				printf -v entry "%-${max_entry_length}s | %-${max_type_length}s | %s" "$entry" "$snapper_type" "$snapper_description"
+				break
+			fi
+		done
+		echo "$entry"
+	done
+
+	IFS=$oldIFS
+}
+
+## Detect kernels in "/boot"
+detect_kernel()
+{
+	## Arch original kernel (auto-detect)
+	for akernel in "$(boot_dir)"/vmlinuz-* ; do 
+		list_kernel+=("$akernel")
+	done
+
+	## Custom name kernel in GRUB_BTRFS_NKERNEL
+	if [ ! -z "${nkernel}" ] ; then
+		for ckernel in "${nkernel[@]}" ; do
+			[[ ! -f /"$(boot_dir)"/"${ckernel}" ]] && continue;
+			list_kernel+=("$ckernel")
+		done
+	fi
+}
+
+## Detect initramfs in "/boot"
+detect_initramfs()
+{
+	## Arch original initramfs (auto-detect)
+	for ainitramfs in "$(boot_dir)"/initramfs-* ; do 
+		list_initramfs+=("$ainitramfs")
+	done
+	
+	## Custom name initramfs in GRUB_BTRFS_NINIT
+	if [ ! -z "$ninit" ] ; then
+		for cinitramfs in "${ninit[@]}" ; do
+			[[ ! -f /"$(boot_dir)"/"${cinitramfs}" ]] && continue;
+			list_initramfs+=("$cinitramfs")
+		done
+	fi
+}
+
+## Detect microcode in "/boot"
+detect_microcode()
+{
+	## Arch original intel microcode
+	for aucode in "$(boot_dir)"/intel-ucode.img ; do
+		list_ucode+=("$aucode")
+	done
+
+	## Custom name microcode in GRUB_BTRFS_INTEL_UCODE
+	if [ ! -z "$microcode" ] ; then
+		for cucode in "${microcode[@]}" ; do
+			[[ ! -f /"$(boot_dir)"/"${cucode}" ]] && continue
+			list_ucode+=("$cucode")
+		done
+	fi
+}
+
+## Show full path snapshot or only name
+path_snapshot()
+{
+	case "${path_snapshot}" in
+		true) name_snapshot=("${snap_full_name}");;
+		*) name_snapshot=("${snap_full_name#*"/"}")
+	esac
+}
+
+## Title format in grub-menu
+title_format()
+{
+	case "${title_format}" in
+		p/d/n) 	title_menu="${prefixentry} ${snap_date_time} ${name_snapshot}";;
+		p/n/d) 	title_menu="${prefixentry} ${name_snapshot} ${snap_date_time}";;
+		p/d) 	title_menu="${prefixentry} ${snap_date_time}";;
+		p/n) 	title_menu="${prefixentry} ${name_snapshot}";;
+		d/n) 	title_menu="${snap_date_time} ${name_snapshot}";;
+		n/d) 	title_menu="${name_snapshot} ${snap_date_time}";;
+		p) 	title_menu="${prefixentry}";;
+		d)	title_menu="${snap_date_time}";;
+		n)	title_menu="${name_snapshot}";;
+		*)	gettext_printf $"# Warning: GRUB_BTRFS_TITLE_FORMAT=${title_format}, syntax error \n" >&2
+	esac
+}
+
+## List of kernels, initramfs and microcode in snapshots
+list_kernels_initramfs()
+{
+	IFS=$'\n'
+	count_limit_snap=0
+	for item in $(snapshot_list); do
+		### fix: limit_snap_show=0
+		[[ ${limit_snap_show} -le 0 ]] && break;
+		IFS=$oldIFS
+		snap_full_name="$(echo "$item" | cut -d'|' -f2-)" # do not trim it to keep nice formatting
+		snap_dir_name="$(echo "$item" | cut -d'|' -f2)"
+		snap_dir_name="$(trim "$snap_dir_name")"
+
+		### ignore specific path during run "grub-mkconfig"
+		if [ ! -z "${ignore_specific_path}" ] ; then
+			for isp in ${ignore_specific_path[@]} ; do
+				[[ "${gbgmp}"/"${snap_dir_name}" == "${gbgmp}"/"${isp}"/* ]] && continue 2;
+			done
+		fi
+		### detect if /boot directory exists
+		[[ ! -d "$gbgmp/$snap_dir_name/boot" ]] && continue;
+		### show snapshot found during run "grub-mkconfig"
+		snap_date_time="$(echo "$item" | cut -d' ' -f1-2)"
+		snap_date_time="$(trim "$snap_date_time")"
+		if [[ "${show_snap_found}" = "true" ]]; then
+		gettext_printf $"# Found snapshot: %s\n" "$item" >&2 ;
+		fi
+		### Kernel (auto-detect + custom kernel)
+		unset list_kernel
+		detect_kernel
+		name_kernel=("${list_kernel[@]##*"/"}")
+		# echo "kernel = ${name_kernel[*]}"
+		if [[ "${harmonized_entries}" != "true" ]]; then
+			### Initramfs (autodetect + custom initramfs)
+			unset list_initramfs
+			detect_initramfs
+			name_initramfs=("${list_initramfs[@]##*"/"}")
+			# echo "initramfs = ${name_initramfs[*]}"
+		fi
+		### microcode (auto-detect + custom microcode)
+		unset list_ucode
+		detect_microcode
+		name_microcode=("${list_ucode[@]##*"/"}")
+		# echo "ucode = ${name_microcode[*]}"
+		### real path to boot
+		boot_dir_real_path="$(make_system_path_relative_to_its_root "$(boot_dir)")"
+		### Create menu entries
+		## name snapshot
+		path_snapshot
+		## title menu custom
+		title_format
+		# echo "${title_menu}"
+		if [[ "${harmonized_entries}" = "false" ]]; then
+			snapshots_entry
+		else
+			harmonized_snapshots_entry
+		fi
+		### Limit snapshots found during run "grub-mkconfig"
+	        count_limit_snap=$((1+$count_limit_snap))
+	        [[ $count_limit_snap -ge $limit_snap_show ]] && break;
+	done
+	IFS=$oldIFS
+}
+### END auto detect ###
+
+### Start ###
+	gettext_printf "###### - Grub-btrfs: Auto-detect Start - ######\n" >&2 ;
+	### create mount point and mounts
+	[[ ! -d $gbgmp ]] && mkdir -p $gbgmp
+	mount -o subvolid=5 /dev/disk/by-uuid/$root_uuid $gbgmp/
+	### Create a menu in grub
+	echo "submenu '${submenuname}' {"
+	list_kernels_initramfs ;
+	## show total found snapshots
+	if [[ "${show_total_snap_found}" = "true" ]]; then
+	gettext_printf "# Found ${count_limit_snap} snapshot(s)\n" >&2 ;
+	fi
+	## if no snapshot found, show a warning 
+	if [[ "${count_limit_snap}" = "0" ]]; then
+		echo " submenu '---> "No snapshot found : Press ESC to return previous menu" <---' { echo } ";
+		gettext_printf "# No snapshot found \n# make sure you have at least one snapshot \n# or please file a bug report at \"https://github.com/Antynea/grub-btrfs\"\n" >&2 ;
+	fi
+	echo "}"
+	## unmount mount point
+	umount $gbgmp
+	gettext_printf "###### - Grub-btrfs: Auto-detect End   - ######\n" >&2 ;
+### End ###

README.md

@@ -1,34 +1,115 @@
-### grub-btrfs
+[![GitHub release](https://img.shields.io/github/release/Antynea/grub-btrfs.svg)](https://github.com/Antynea/grub-btrfs)
+  
+## grub-btrfs
+
+This is a version 2.xx of grub-btrfs
+##### BTC donation address: 1Lbvz244WA8xbpHek9W2Y12cakM6rDe5Rt
+##
+### Description
+
+grub-btrfs, Include btrfs snapshots at boot options. (grub menu)
+##
+### What does grub-btrfs v2.xx do :
+
+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. (For custom name, see below.)
+
+* Automatically Create corresponding "menuentry" in grub.cfg , which ensures a very easy rollback.
+
+* Automatically detect snapper and use snapper's snapshot description if available.
+##
+### How to use it:
+
+Add this lines to /etc/default/grub:
+
+* GRUB_BTRFS_SUBMENUNAME="Arch Linux Snapshots"
+
+	(Name menu appearing in grub.)
+
+* GRUB_BTRFS_PREFIXENTRY="Snapshot:"
+
+	(Add a name ahead your snapshots entries.)
+	
+* GRUB_BTRFS_DISPLAY_PATH_SNAPSHOT="true"
+	
+	(Show full path snapshot or only name, 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=("vmlinuz-linux")
+
+	(Use only if you have a custom kernel name or auto-detect failed.)
+
+* GRUB_BTRFS_NINIT=("initramfs-linux.img" "initramfs-linux-fallback.img")
+
+	(Use only if you have a custom initramfs name or auto-detect failed.)
+
+* GRUB_BTRFS_INTEL_UCODE=("intel-ucode.img")
+
+	(Use only if you have custom intel-ucode or auto-detect failed.)
+
+* GRUB_BTRFS_LIMIT="100"
+
+	(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.)
+
+* GRUB_BTRFS_SHOW_SNAPSHOTS_FOUND="true"
+	
+	(Show snapshots found during run "grub-mkconfig") 
+	
+* GRUB_BTRFS_SHOW_TOTAL_SNAPSHOTS_FOUND="true"
+	
+	(Show Total number of snapshots found during run "grub-mkconfig")
+
+* GRUB_BTRFS_IGNORE_SPECIFIC_PATH=("var/lib/docker" "nosnapshot")
+
+	(Ignore specific path during run "grub-mkconfig")
+
+* GRUB_BTRFS_CREATE_ONLY_HARMONIZED_ENTRIES="false"
+
+	(Create entries with matching version number instead of all possible combinations of kernel and initramfs, very useful with debian-like distributions)
 
 
-This is a version 0.xx of grub-btrfs :
 
-#### Desciption
-
-grub-btrfs, add support for btrfs snapshots into grub menu
-
-#### What does grub-btrfs v0.xx do :
-
-Simple rollback using snapshots you made previous.
-
-Makes a list of all snapshots, kernels, initramfs present on the filesystem and then creates a corresponding entered with name and date of snapshots in grub.cfg, which ensures a very easy rollback.
-
-#### How to use it :
-
-1. Edit 41_snapshots-btrfs file :
-
-	* submenuname = name menu appear in grub ( e.g: submenuname="ArchLinux Snapshots" )
-
-	* prefixentry = add a name ahead your snapshots entries ( e.g: prefixentry="Snapshot" )
-
-	* nkernel= name kernel you use it ( e.g: nkernel=("vmlinuz-linux") )
-
-	* ninit= name initramfs (ramdisk) you use it ( e.g: ninit=("initramfs-linux.img" "initramfs-linux-fallback.img") )
-
-	* intel_ucode= name intel microcode you use it ( e.g: intel_ucode=("intel-ucode.img") )
-
-2. Generate grub.cfg (on Archlinux is grub-mkconfig -o /boot/grub/grub.cfg )
+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 different entries, e.g : Prefixentry name of snapshot [2013-02-11 04:00:00]
+You will see it appear differents entries (e.g : Snapshot: 2018-01-03 15:08:41  @test1 )
+##
+### 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.
+
+##
+### Discussion
+Pour les francophones : https://forums.archlinux.fr/viewtopic.php?f=18&t=17177
+##
+### Special thanks for assistance and contributions
+
+* [maximbaz](https://github.com/maximbaz)
+* [crossroads1112](https://github.com/crossroads1112)
+* [penetal](https://github.com/penetal)
+* [wesbarnett](https://github.com/wesbarnett)
+* [Psykar](https://github.com/Psykar)
+* [anyc](https://github.com/anyc)
+* [daftaupe](https://github.com/daftaupe)
+* [N-Parsons](https://github.com/N-Parsons)
+##