From 4ac7221c5309a31246b26bb4495b0f86061d42e6 Mon Sep 17 00:00:00 2001
From: Jonathan Bauer
Date: Wed, 27 Feb 2019 11:03:46 +0100
Subject: improvements & bug fixes

---
 slx-tools | 41 ++++++++++++++++++++++++++++++-----------
 1 file changed, 30 insertions(+), 11 deletions(-)

diff --git a/slx-tools b/slx-tools
index cce30a2..02703de 100644
--- a/slx-tools
+++ b/slx-tools
@@ -4,14 +4,22 @@
 ################################################################################
 export PATH=$PATH:/opt/openslx/bin:/opt/openslx/sbin
 
-declare -rg dmstate="/run/openslx/dmsetup.state"
+dmstate="/run/openslx/dmsetup.state"
+readonly dmstate
 
-get_backing_part() {
-	local _dev _mp
-	read -r _dev _mp _rest <<< \
-		"$(df -P "$1" 2>&1 | awk '$1 ~ /^\/dev\// {print $1" "$6}')"
+df_dev_only() {
+	df -P "$1" 2>&1 | awk '$1 ~ /^\/dev\// {print $0}'
+}
+
+get_backing_dev() {
+	local _dev="$(df_dev_only "$1" | awk '{print $1}' )"
 	[ -b "$_dev" ] || return 1
-	echo $_dev
+	echo "$_dev"
+}
+get_backing_dev_mp() {
+	local _mp="$(df_dev_only "$1" | awk '{print $6}')"
+	[ -d "$_mp" ] || return 1
+	echo "$_mp"
 }
 # Helper to check whether given directory resides in RAM, either
 # by being mounted as tmpfs or not mounted at all in which case
@@ -19,8 +27,11 @@ get_backing_part() {
 # 2 when errors occur.
 is_volatile() {
 	[ -z "$1" ] && return 2
-	local _dev="$(get_backing_part $1)"
+	local _dev="$(get_backing_dev "$1")"
+	[ -z "$_dev" ] && return 0
 	[ "$_dev" = "${_dev//\/dev\/mapper/}" ] && return 1
+	local _mp="$(get_backing_dev_mp "$1")"
+	[ -z "$_mp" ] && return 2
 	# it is a device mapper device, check if it was setup in dracut's initramfs.
 	if [ -s "$dmstate" ]; then
 		grep -qE "^${_dev}\s+${_mp}\s+type=0" "$dmstate"
@@ -35,10 +46,14 @@ get_dm_backing_size() {
 	[ "$_dev" = "${_dev//\/dev\/mapper/}" ] && return 1
 	local _dm_line="$(grep -m1 -E "^${_dev}\s+/\s+type=[^0]" "$dmstate")"
 	[ -z "$_dm_line" ] && return 1
-	local _dm_dev_size="$(grep -Po '(?<=physical_size=|virtual_size=)\w*' <<< "$_dm_line" )"
+	local _dm_dev_size="$(echo "$_dm_line" | grep -Po '(?<=physical_size=|virtual_size=)\w*' )"
 	echo ${_dm_dev_size:--1}
 }
 
+regex_match() {
+	echo "$1" | grep -qE "$2"
+}
+
 get_partitions_by_id () {
 	local ID dev exp target
 	exp=
@@ -56,11 +71,15 @@ get_partitions_by_id () {
 		shift
 		[ -z "$ID" ] && continue
 		# if single digit, e.g. 7, look for 0x7 and 0x07
-		[[ $ID =~ ^[0-9]$ ]] && ID="0?$ID"
-		if [[ $ID =~ ^[0-9]{2}$ ]]; then
+		#[[ $ID =~ ^[0-9]$ ]] && ID="0?$ID"
+		if regex_match "$ID" "^[0-9]$"  ; then
+			ID="0?$ID"
+		fi
+
+		if regex_match "$ID" "^[0-9]{2}$"; then
 			# if double digit look for MBR types and OpenSLX-ID$ID GPT labels
 			exp="$exp|ID_PART_ENTRY_(NAME=OpenSLX-ID|TYPE=0x)$ID"
-		elif [[ $ID =~ ^(0x[0-9]{2}|[0-9a-f]{8}-([0-9a-f]{4}-){3}[0-9a-f]{12})$ ]]; then
+		elif regex_match "$ID" "^(0x[0-9]{2}|[0-9a-f]{8}-([0-9a-f]{4}-){3}[0-9a-f]{12})$"; then
 			# if full MBR type (e.g. 0x44) or UUID look for TYPE
 			exp="$exp|ID_PART_ENTRY_TYPE=$ID"
 		else
-- 
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