From 236b8ce3a6581929f965a633c7d89aab684dff82 Mon Sep 17 00:00:00 2001
From: Mikhail Novosyolov <m.novosyolov@rosalinux.ru>
Date: Thu, 14 Nov 2019 01:26:18 +0300
Subject: [PATCH] Avoid tricky shell construction

It sometimes failed:

environment: line 4: 1
7+1: syntax error in expression (error token is "7+1")
---
 kernel.spec | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/kernel.spec b/kernel.spec
index 4d76ae6..ed6f8ee 100644
--- a/kernel.spec
+++ b/kernel.spec
@@ -1084,13 +1084,15 @@ cp -a %{temp_root} %{buildroot}
 # Multithreaded verification that every kernel module
 # has a signature attached to it
 mkdir -p "%{certs_dir_rnd}"
-echo 0 > %{certs_verify_tmp}
+touch %{certs_verify_tmp}
 _verify_signature(){
 	if [ -z "$1" ] || [ ! -f "$1" ]; then return; fi
 	if hexdump -C "$1" | rev | cut -f 2 -d '|' | rev | tr -d '\n' | \
 	   grep -q '~Module signature appended~'
 		then
-			echo $(($(cat %{certs_verify_tmp})+1)) > %{certs_verify_tmp}
+			if [ -f %{certs_verify_tmp} ]; then
+				rm -f %{certs_verify_tmp}
+			fi
 		else
 			echo "ERROR: Module $1 has no signature attached to it!"
 			exit 1
@@ -1099,11 +1101,10 @@ _verify_signature(){
 export -f _verify_signature
 find %{target_modules} -name '*.ko' -print0 | sort -u | \
 	xargs --null -P "$(nproc)" -I {} "$SHELL" -c '_verify_signature "{}"'
-if [ "$(cat %{certs_verify_tmp})" -lt 1 ]; then
+if [ -f %{certs_verify_tmp} ]; then
 	echo "ERROR: seems that signatures of none modules were verified!"
 	exit 1
 fi
-cat %{certs_verify_tmp}
 rm -f %{certs_verify_tmp}
 %endif