debian: fix wrong kernel version used in preinst

This script is used in the non-dkms scst package. The purpose of package
is to determine kernel location at compile-time, as opposed to the
package installation time. However, calling `uname -r` in package
installation time violates that idea because it would get some random
kernel that was running on the machine. This problem is particularly
seen in containers, because in those `uname` shows the kernel running on
the host, rather than the one running inside container.

Fix this by determining the kernel location in `preinst` script at
compile time as well.

Makefile

@@ -367,6 +367,8 @@ dpkg: ../scst_$(VERSION).orig.tar.gz
 	[ -z "$$DEBFULLNAME" ] || export DEBFULLNAME="Bart Van Assche" &&\
 	sed 's/%{scst_version}/$(VERSION)/'				\
 	  <debian/scst.dkms.in >debian/scst.dkms &&			\
+	sed 's/%{KVER}/$(KVER)/'				\
+	  <debian/scst.preinst.in >debian/scst.preinst &&			\
 	output_files=(							\
 		../*_$(VERSION)-$(DEBIAN_REVISION)_*.deb		\
 		../*_$(VERSION)-$(DEBIAN_REVISION)_*.ddeb		\

debian/rules

@@ -29,7 +29,7 @@ export KDIR=$(DEB_KDIR_SET)
 clean:
 	dh_testdir &&							\
 	dh_prep -Xqla_isp/TAGS -Xdebian/changelog &&			\
-	scripts/clean-source-tree -x debian/changelog -x debian/compat
+	scripts/clean-source-tree -x debian/changelog -x debian/compat -x debian/scst.preinst
 
 build:
 	make 2release &&						\

debian/scst.preinst.in

@@ -17,7 +17,7 @@ set -e
 case "$1" in
     install)
 	# Remove any existing ib_srpt.ko kernel modules
-	find "/lib/modules/$(uname -r)" -name ib_srpt.ko -exec rm {} \;
+	find "/lib/modules/%{KVER}" -name ib_srpt.ko -exec rm {} \;
 	# Remove files installed by "make install"
 	rm -f /usr/local/man/man5/iscsi-scstd.conf.5
 	rm -f /usr/local/man/man8/iscsi-scst-adm.8