[PATCH v2 3/3] kbuild: package: add -e and -u options to some shell scripts

[Masahiro Yamada <masahiroy@kernel.org>]

Set -e to make these scripts fail on the first error.

Set -u because these scripts are invoked by Makefile, and do not work
properly without necessary variables defined.

I tweaked mkdebian to cope with optional environment variables.

Remove the explicit "test -n ..." from install-extmod-build.

Both options are described in POSIX. [1]

[1]: https://pubs.opengroup.org/onlinepubs/009604499/utilities/set.html

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
---

Changes in v2:
 - Fix build errors from scripts/package/mkdebian

 scripts/package/builddeb             | 2 +-
 scripts/package/buildtar             | 2 +-
 scripts/package/gen-diff-patch       | 2 ++
 scripts/package/install-extmod-build | 5 +----
 scripts/package/mkdebian             | 8 ++++----
 scripts/package/mkspec               | 2 ++
 6 files changed, 11 insertions(+), 10 deletions(-)

diff --git a/scripts/package/builddeb b/scripts/package/builddeb
index e797ad360f7a..c1757db6aa8a 100755
--- a/scripts/package/builddeb
+++ b/scripts/package/builddeb
@@ -10,7 +10,7 @@
 # specified in KDEB_HOOKDIR) that will be called on package install and
 # removal.
 
-set -e
+set -eu
 
 is_enabled() {
 	grep -q "^$1=y" include/config/auto.conf
diff --git a/scripts/package/buildtar b/scripts/package/buildtar
index eb67787f8673..cc87a473c01f 100755
--- a/scripts/package/buildtar
+++ b/scripts/package/buildtar
@@ -11,7 +11,7 @@
 # Wichert Akkerman <wichert@wiggy.net>.
 #
 
-set -e
+set -eu
 
 #
 # Some variables and settings used throughout the script
diff --git a/scripts/package/gen-diff-patch b/scripts/package/gen-diff-patch
index 8a98b7bb78a0..f272f7770ea3 100755
--- a/scripts/package/gen-diff-patch
+++ b/scripts/package/gen-diff-patch
@@ -1,6 +1,8 @@
 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0-only
 
+set -eu
+
 diff_patch=$1
 
 mkdir -p "$(dirname "${diff_patch}")"
diff --git a/scripts/package/install-extmod-build b/scripts/package/install-extmod-build
index 76e0765dfcd6..8cc9e13403ae 100755
--- a/scripts/package/install-extmod-build
+++ b/scripts/package/install-extmod-build
@@ -1,13 +1,10 @@
 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0-only
 
-set -e
+set -eu
 
 destdir=${1}
 
-test -n "${srctree}"
-test -n "${SRCARCH}"
-
 is_enabled() {
 	grep -q "^$1=y" include/config/auto.conf
 }
diff --git a/scripts/package/mkdebian b/scripts/package/mkdebian
index 83c6636fadb8..0cc1913aad30 100755
--- a/scripts/package/mkdebian
+++ b/scripts/package/mkdebian
@@ -4,7 +4,7 @@
 #
 # Simple script to generate a debian/ directory for a Linux kernel.
 
-set -e
+set -eu
 
 is_enabled() {
 	grep -q "^$1=y" include/config/auto.conf
@@ -19,7 +19,7 @@ if_enabled_echo() {
 }
 
 set_debarch() {
-	if [ -n "$KBUILD_DEBARCH" ] ; then
+	if [ "${KBUILD_DEBARCH:+set}" ]; then
 		debarch="$KBUILD_DEBARCH"
 		return
 	fi
@@ -141,7 +141,7 @@ fi
 
 # Some variables and settings used throughout the script
 version=$KERNELRELEASE
-if [ -n "$KDEB_PKGVERSION" ]; then
+if [ "${KDEB_PKGVERSION:+set}" ]; then
 	packageversion=$KDEB_PKGVERSION
 else
 	packageversion=$(${srctree}/scripts/setlocalversion --no-local ${srctree})-$($srctree/scripts/build-version)
@@ -158,7 +158,7 @@ debarch=
 set_debarch
 
 # Try to determine distribution
-if [ -n "$KDEB_CHANGELOG_DIST" ]; then
+if [ "${KDEB_CHANGELOG_DIST:+set}" ]; then
         distribution=$KDEB_CHANGELOG_DIST
 # In some cases lsb_release returns the codename as n/a, which breaks dpkg-parsechangelog
 elif distribution=$(lsb_release -cs 2>/dev/null) && [ -n "$distribution" ] && [ "$distribution" != "n/a" ]; then
diff --git a/scripts/package/mkspec b/scripts/package/mkspec
index cffc2567bef2..77d25dda37e3 100755
--- a/scripts/package/mkspec
+++ b/scripts/package/mkspec
@@ -9,6 +9,8 @@
 #	Patched for non-x86 by Opencon (L) 2002 <opencon@rio.skydome.net>
 #
 
+set -eu
+
 output=$1
 
 mkdir -p "$(dirname "${output}")"
-- 
2.43.0