From 65ef5e062798d32da31c91f77626c08610c141a9 Mon Sep 17 00:00:00 2001
From: Konstantin Kharlamov <Hi-Angel@yandex.ru>
Date: Tue, 18 May 2021 18:27:32 +0300
Subject: [PATCH] debian: make sure KVER and KDIR are visible to dpkg build

The debuild clears up the environment, thus the essential SCST variables
KVER and KDIR are cleared out. This patch fixes it.

Note: technically, `debild` supports `--preserve-env` option. But in
reality making use of it makes no difference, variables still do not
appear. Work around it by using DEB_foo_SET from `man dpkg-buildflags`
---
 Makefile     | 2 +-
 debian/rules | 5 +++++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index 92831a6d4..77ad72294 100644
--- a/Makefile
+++ b/Makefile
@@ -387,7 +387,7 @@ dpkg: ../scst_$(VERSION).orig.tar.gz
 	else								\
 	  buildopts+=(-j4);						\
 	fi &&								\
-	debuild "$${buildopts[@]}" --lintian-opts --profile debian &&   \
+	DEB_KVER_SET=$(KVER) DEB_KDIR_SET=$(KDIR) debuild "$${buildopts[@]}" --lintian-opts --profile debian && \
 	mkdir -p dpkg &&						\
 	for f in "$${output_files[@]}" ../scst_$(VERSION).orig.tar.[gx]z; do\
 		mv $$f dpkg || true;					\
diff --git a/debian/rules b/debian/rules
index f78e364a0..8342862e9 100755
--- a/debian/rules
+++ b/debian/rules
@@ -17,6 +17,11 @@ SUBDIRS=scst fcst iscsi-scst qla2x00t/qla2x00-target scst_local scstadmin srpt
 DESTDIR=$(CURDIR)/debian/tmp
 VERSION:=$(shell head -n1 debian/changelog | sed 's/.*(\([0-9.]*\).*).*/\1/')
 
+# rules won't see variables unless they're using DEB_foo_SET syntax. So use that as
+# an intermediary. Also, export variables for sub-makes to be able to see them.
+export KVER=$(DEB_KVER_SET)
+export KDIR=$(DEB_KDIR_SET)
+
 %:
 	echo "*** dh $@ ***"
 	dh $@