Fix : GRUB_BTRFS_LIMIT (Limit the number of snapshots populated in the GRUB menu.)

Fix : When a value =< 0, script stop correctly
fix : When a value => 1, script stop when the value is reached

e.g :
 - GRUB_BTRFS_LIMIT="0"
   script doesn't detect snapshot

 - GRUB_BTRFS_LIMIT"1" or "2" "etc..."
   script will stop the snapshot detection when value is reached

41_snapshots-btrfs

@@ -16,19 +16,30 @@
 # - Add this lines to /etc/default/grub:													#
 #																		#
 # * GRUB_BTRFS_SUBMENUNAME="ArchLinux 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)													#
+#	(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 grub-menu, separator "/", custom order available)				#
+#	(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 $GRUB_BTRFS_LIMIT oldest subvolumes will populate the menu.)						#
+# * GRUB_BTRFS_SHOW_SNAPSHOTS_FOUND="true"													#
+#	(Show snapshots found during run "grub-mkconfig")											#
+# * GRUB_BTRFS_SHOW_TOTAL_SNAPSHOTS_FOUND="true"												#
+#	(Show Total of snapshots found during run "grub-mkconfig")										#
 # * GRUB_BTRFS_NKERNEL=("vmlinuz-linux") 		 											#
 #	(Use only if you have custom kernel name or auto-detect failed.)									#
 # * GRUB_BTRFS_NINIT=("initramfs-linux.img" "initramfs-linux-fallback.img")									#
 #	(Use only if you have custom initramfs name or auto-detect failed.)									#
 # * GRUB_BTRFS_INTEL_UCODE=("intel-ucode.img") 													#
-#	(Use only if you have custom intel-ucode or auto-detect failed.)									#
+#	(Use only if you have custom intel-ucode or auto-detect failed.)		    							#
+# * GRUB_BTRFS_IGNORE_SPECIFIC_PATH=("var/lib/docker" "nosapshot")										#
+#	(Ignore specific path during run "grub-mkconfig")											#
 #																		#
 # - Generate grub.cfg (on Archlinux use grub-mkconfig -o /boot/grub/grub.cfg)									#
 #																		#
@@ -37,7 +48,7 @@
 #																		#
 #																		#
 # To do:																	#
-#																		#													#
+#																		#
 #	* Display name of microcode in menuentry when available											#
 #																		#
 #################################################################################################################################################
@@ -56,8 +67,6 @@ sysconfdir="/etc"
 ######################################
 ### Variables in /etc/default/grub ###
 ######################################
-## Choice of method
-choise_of_method=${GRUB_BTRFS_METHOD:-"1"}
 ## Submenu name
 submenuname=${GRUB_BTRFS_SUBMENUNAME:-"ArchLinux Snapshots"}
 ## Prefix entry
@@ -72,14 +81,21 @@ nkernel=("${GRUB_BTRFS_NKERNEL[@]}")
 ninit=("${GRUB_BTRFS_NINIT[@]}")
 ## Microcode(s) name(s)
 microcode=("${GRUB_BTRFS_INTEL_UCODE[@]}")
-## Limit to show in menu
-limit=("${GRUB_BTRFS_LIMIT[@]:-100}")
-## How to sort
-subvolsort=${GRUB_BTRFS_SUBVOLUME_SORT:-"descending"}
-case "${subvolsort}" in
+## Limit to show in the Grub menu
+limit_snap_show="${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[@]}")
+
 
 ########################
 ### variables script ###
@@ -235,7 +251,6 @@ path_snapshot()
 	esac
 }
 
-
 ## Title format in grub-menu
 title_format()
 {
@@ -257,52 +272,77 @@ title_format()
 list_kernels_initramfs()
 {
 	IFS=$'\n'
-    c=0
+	count_limit_snap=0
 	for item in $(snapshot_list); do
+		### fix: limit_snap_show=0
+		[[ ${limit_snap_show} -le 0 ]] && break;
 		IFS=$oldIFS
 		item=($item)
 		snap_dir_name=${item[@]:2:${#item[@]}}
+		### ignore specific path during run "grub-mkconfig"
+		if [ ! -z "${ignore_specific_path}" ] ; then
+			for isp in ${ignore_specific_path[@]} ; do
+				[[ "${gbgmp}"/"${snap_dir_name}" == "${gbgmp}"/"${isp}"/* ]] && continue 2;
+			done
+		fi
+		### detect if /boot directory exist
 		[[ ! -d "$gbgmp/$snap_dir_name/boot" ]] && continue;
+		### show snapshot found during run "grub-mkconfig"
 		snap_date_time=${item[@]:0:2}
+		if [[ "${show_snap_found}" = "true" ]]; then
 		gettext_printf $"# Found Snapshot: %s\n" "${snap_date_time} ${snap_dir_name}" >&2 ;
+		fi
+		### Kernel (auto-detect + custom kernel)
 		unset list_kernel
 		detect_kernel
 		name_kernel=("${list_kernel[@]##*"/"}")
 		# echo "kernel = ${name_kernel[*]}"
+		### Initramfs (autodetect + custom initramfs)
 		unset list_initramfs
 		detect_initramfs
 		name_initramfs=("${list_initramfs[@]##*"/"}")
 		# echo "initramfs = ${name_initramfs[*]}"
+		### microcode (auto-detect + custom microcode)
 		unset list_ucode
 		detect_microcode
 		name_microcode=("${list_ucode[@]##*"/"}")
 		# echo "ucode = ${name_microcode[*]}"
+		### real path to boot
 		boot_dir_real_path="$(make_system_path_relative_to_its_root "$(boot_dir)")"
-		## Create menu entries
-		# name snpashot
+		### Create menu entries
+		## name snpashot
 		path_snapshot
-		# title menu custom
+		## title menu custom
 		title_format
 		# echo "${title_menu[*]}"
 		snapshots_entry
-        c=$((1+$c))
-        if [[ $c -gt $limit ]]; then
-            break;
-        fi
+		### Limit snapshots found during run "grub-mkconfig"
+	        count_limit_snap=$((1+$count_limit_snap))
+	        [[ $count_limit_snap -ge $limit_snap_show ]] && break;
 	done
 	IFS=$oldIFS
 }
 ### END auto detect ###
 
-### Choice of method ###
-if [ ${choise_of_method} = "1" ] ; then 
-	gettext_printf "###### - Grub-btrfs: Auto-detect - ######\n" >&2 ;
+### Start ###
+	gettext_printf "###### - Grub-btrfs: Auto-detect Start - ######\n" >&2 ;
+	### create mount point and mounts
 	[[ ! -d $gbgmp ]] && mkdir -p $gbgmp
 	mount -o subvolid=0 /dev/disk/by-uuid/$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 - ######\n" >&2 ;
-fi
-### End choice of method ###
+	gettext_printf "###### - Grub-btrfs: Auto-detect End   - ######\n" >&2 ;
+### End ###

README.md

@@ -17,7 +17,7 @@ Simple rollback using snapshots you made previously.
 
 * 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 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.
 
@@ -44,25 +44,40 @@ Add this lines to /etc/default/grub:
 
 * GRUB_BTRFS_NKERNEL=("vmlinuz-linux")
 
-	(Use only if you have custom kernel name or auto-detect failed.)
+	(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 custom initramfs name or auto-detect failed.)
+	(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")
+* 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")
 
-    (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.)
 
 Generate grub.cfg (on Archlinux use grub-mkconfig -o /boot/grub/grub.cfg )
 
@@ -76,6 +91,5 @@ You will see it appear differents entries (e.g : Snapshot: [2014-02-12 11:24:37]
 * Display name of microcode in menuentry when available
 
 
-
 ## discussion
 Pour les francophones : https://forums.archlinux.fr/viewtopic.php?f=18&t=17177