From 2da6318f4214725c22d2a403680b3fdcd72f1ff3 Mon Sep 17 00:00:00 2001
From: Simon Rettberg
Date: Fri, 7 May 2021 15:19:34 +0200
Subject: [fs/path] Use bc for math

Some awk versions use ugly formatting (scientific notion) for large
numbers, which breaks any further handling of thise numbers in scripts.
---
 modules/fs/path.inc | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/modules/fs/path.inc b/modules/fs/path.inc
index fd035b5..714578f 100644
--- a/modules/fs/path.inc
+++ b/modules/fs/path.inc
@@ -71,7 +71,7 @@ fs_path_isvolatile() {
 # Returns "<free> <total>"
 fs_path_space() {
 	[ -z "$1" ] && return 1
-	local _free _total _dev _type _id _name _bs _tmp _tfree _ttotal
+	local _free _total _dev _type _id _name _bs _tmp _tused _tfree _ttotal
 	_type="$( fs_path_gettype "$1" )"
 	[ -z "$_type" ] && return 1
 	_free="$( df -P "$1" | awk '$6 ~ "^/" {print $4 " " $2}' )"
@@ -95,9 +95,11 @@ fs_path_space() {
 	case "$_type" in
 		snapshot)
 			# Field 4 is used/total in sectors of 512 byte, so divide by two for KiB
-			_tmp="$( dmsetup status "$_dev" | awk '{split($4, a, "/"); print (a[2] - a[1]) / 2 " " a[2] / 2}' )"
-			_tfree="${_tmp% *}"
+			_tmp="$( dmsetup status "$_dev" | awk '{split($4, a, "/"); print a[1] " " a[2]}' )"
+			_tused="${_tmp% *}"
 			_ttotal="${_tmp#* }"
+			_tfree=$( echo "($_ttotal - $_tused) / 2" | bc )
+			_ttotal=$( echo "$_ttotal / 2" | bc )
 			;;
 		thin)
 			# Determine matching pool
@@ -109,9 +111,11 @@ fs_path_space() {
 					_bs="$( dmsetup table "$_name" | awk '{print $6}' )"
 					if [ "$_bs" -gt 0 ]; then
 						# Field 6 is used/total (in data blocks), so transform into KiB
-						_tmp="$( dmsetup status "$_name" | awk -v "bs=$_bs" '{split($6, a, "/"); print ((a[2] - a[1]) / 2) * bs " " (a[2] / 2) * bs}' )"
-						_tfree="${_tmp% *}"
+						_tmp="$( dmsetup status "$_name" | awk '{split($6, a, "/"); print a[1] " " a[2]}' )"
+						_tused="${_tmp% *}"
 						_ttotal="${_tmp#* }"
+						_tfree=$( echo "(($_ttotal - $_tused) / 2) * $_bs" | bc )
+						_ttotal=$( echo "($_ttotal / 2) * $_bs" | bc )
 					fi
 				fi
 			fi
-- 
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