[PATCH] selftests: make shell scripts POSIX-compliant

[Aditya Dutt <duttaditya18@gmail.com>]

Changes include:
- Replaced [[ ... ]] with [ ... ]
- Replaced == with =
- Replaced printf -v with cur=$(printf ...).
- Replaced echo -e with printf "%b\n" ...

The above mentioned are Bash/GNU extensions and are not part of POSIX.
Using shells like dash or non-GNU coreutils may produce errors.
They have been replaced with POSIX-compatible alternatives.

Signed-off-by: Aditya Dutt <duttaditya18@gmail.com>
---

I have made sure to only change the files that specifically have the
/bin/sh shebang.
I have referred to https://mywiki.wooledge.org/Bashism for information
on what is and what isn't POSIX-compliant.

 tools/testing/selftests/cgroup/test_cpuset_v1_hp.sh   | 10 +++++-----
 tools/testing/selftests/kexec/kexec_common_lib.sh     |  2 +-
 tools/testing/selftests/kexec/test_kexec_file_load.sh |  2 +-
 tools/testing/selftests/net/veth.sh                   | 10 +++++-----
 tools/testing/selftests/powerpc/eeh/eeh-vf-aware.sh   |  2 +-
 tools/testing/selftests/zram/zram_lib.sh              |  2 +-
 6 files changed, 14 insertions(+), 14 deletions(-)

diff --git a/tools/testing/selftests/cgroup/test_cpuset_v1_hp.sh b/tools/testing/selftests/cgroup/test_cpuset_v1_hp.sh
index 3f45512fb512..00416248670f 100755
--- a/tools/testing/selftests/cgroup/test_cpuset_v1_hp.sh
+++ b/tools/testing/selftests/cgroup/test_cpuset_v1_hp.sh
@@ -11,24 +11,24 @@ skip_test() {
 	exit 4 # ksft_skip
 }
 
-[[ $(id -u) -eq 0 ]] || skip_test "Test must be run as root!"
+[ $(id -u) -eq 0 ] || skip_test "Test must be run as root!"
 
 # Find cpuset v1 mount point
 CPUSET=$(mount -t cgroup | grep cpuset | head -1 | awk -e '{print $3}')
-[[ -n "$CPUSET" ]] || skip_test "cpuset v1 mount point not found!"
+[ -n "$CPUSET" ] || skip_test "cpuset v1 mount point not found!"
 
 #
 # Create a test cpuset, put a CPU and a task there and offline that CPU
 #
 TDIR=test$$
-[[ -d $CPUSET/$TDIR ]] || mkdir $CPUSET/$TDIR
+[ -d $CPUSET/$TDIR ] || mkdir $CPUSET/$TDIR
 echo 1 > $CPUSET/$TDIR/cpuset.cpus
 echo 0 > $CPUSET/$TDIR/cpuset.mems
 sleep 10&
 TASK=$!
 echo $TASK > $CPUSET/$TDIR/tasks
 NEWCS=$(cat /proc/$TASK/cpuset)
-[[ $NEWCS != "/$TDIR" ]] && {
+[ $NEWCS != "/$TDIR" ] && {
 	echo "Unexpected cpuset $NEWCS, test FAILED!"
 	exit 1
 }
@@ -38,7 +38,7 @@ sleep 0.5
 echo 1 > /sys/devices/system/cpu/cpu1/online
 NEWCS=$(cat /proc/$TASK/cpuset)
 rmdir $CPUSET/$TDIR
-[[ $NEWCS != "/" ]] && {
+[ $NEWCS != "/" ] && {
 	echo "cpuset $NEWCS, test FAILED!"
 	exit 1
 }
diff --git a/tools/testing/selftests/kexec/kexec_common_lib.sh b/tools/testing/selftests/kexec/kexec_common_lib.sh
index 641ef05863b2..b65616ea67f8 100755
--- a/tools/testing/selftests/kexec/kexec_common_lib.sh
+++ b/tools/testing/selftests/kexec/kexec_common_lib.sh
@@ -96,7 +96,7 @@ get_secureboot_mode()
 	local secureboot_mode=0
 	local system_arch=$(get_arch)
 
-	if [ "$system_arch" == "ppc64le" ]; then
+	if [ "$system_arch" = "ppc64le" ]; then
 		get_ppc64_secureboot_mode
 		secureboot_mode=$?
 	else
diff --git a/tools/testing/selftests/kexec/test_kexec_file_load.sh b/tools/testing/selftests/kexec/test_kexec_file_load.sh
index c9ccb3c93d72..072e03c8b1c3 100755
--- a/tools/testing/selftests/kexec/test_kexec_file_load.sh
+++ b/tools/testing/selftests/kexec/test_kexec_file_load.sh
@@ -226,7 +226,7 @@ get_secureboot_mode
 secureboot=$?
 
 # Are there pe and ima signatures
-if [ "$(get_arch)" == 'ppc64le' ]; then
+if [ "$(get_arch)" = 'ppc64le' ]; then
 	pe_signed=0
 else
 	check_for_pesig
diff --git a/tools/testing/selftests/net/veth.sh b/tools/testing/selftests/net/veth.sh
index 6bb7dfaa30b6..e86f102f9028 100755
--- a/tools/testing/selftests/net/veth.sh
+++ b/tools/testing/selftests/net/veth.sh
@@ -137,7 +137,7 @@ __change_channels()
 	local i
 
 	while true; do
-		printf -v cur '%(%s)T'
+		cur=$(printf '%(%s)T')
 		[ $cur -le $end ] || break
 
 		for i in `seq 1 $CPUS`; do
@@ -157,7 +157,7 @@ __send_data() {
 	local end=$1
 
 	while true; do
-		printf -v cur '%(%s)T'
+		cur=$(printf '%(%s)T')
 		[ $cur -le $end ] || break
 
 		ip netns exec $NS_SRC ./udpgso_bench_tx -4 -s 1000 -M 300 -D $BM_NET_V4$DST
@@ -166,7 +166,7 @@ __send_data() {
 
 do_stress() {
 	local end
-	printf -v end '%(%s)T'
+	cur=$(printf '%(%s)T')
 	end=$((end + $STRESS))
 
 	ip netns exec $NS_SRC ethtool -L veth$SRC rx 3 tx 3
@@ -198,8 +198,8 @@ do_stress() {
 
 usage() {
 	echo "Usage: $0 [-h] [-s <seconds>]"
-	echo -e "\t-h: show this help"
-	echo -e "\t-s: run optional stress tests for the given amount of seconds"
+	printf "%b\n" "\t-h: show this help"
+	printf "%b\n" "\t-s: run optional stress tests for the given amount of seconds"
 }
 
 STRESS=0
diff --git a/tools/testing/selftests/powerpc/eeh/eeh-vf-aware.sh b/tools/testing/selftests/powerpc/eeh/eeh-vf-aware.sh
index 874c11953bb6..18fdf88936f0 100755
--- a/tools/testing/selftests/powerpc/eeh/eeh-vf-aware.sh
+++ b/tools/testing/selftests/powerpc/eeh/eeh-vf-aware.sh
@@ -36,7 +36,7 @@ done
 
 eeh_disable_vfs
 
-if [ "$tested" == 0 ] ; then
+if [ "$tested" = 0 ] ; then
 	echo "No VFs with EEH aware drivers found, skipping"
 	exit $KSELFTESTS_SKIP
 fi
diff --git a/tools/testing/selftests/zram/zram_lib.sh b/tools/testing/selftests/zram/zram_lib.sh
index 21ec1966de76..923dbeb64eaf 100755
--- a/tools/testing/selftests/zram/zram_lib.sh
+++ b/tools/testing/selftests/zram/zram_lib.sh
@@ -37,7 +37,7 @@ kernel_gte()
 
 	if [ $kernel_major -gt $major ]; then
 		return 0
-	elif [[ $kernel_major -eq $major && $kernel_minor -ge $minor ]]; then
+	elif [ $kernel_major -eq $major && $kernel_minor -ge $minor ]; then
 		return 0
 	fi
 
-- 
2.34.1