drbd: build dkms package for RPM distros

Also build the DKMS package for RPM distros that support it. This is by default
available on amazonlinux, RHEL derived distros can use EPEL to get the required
dkms base package.

To make the dkms config available for builds, we move it to misc/. One subtle
change is that we now have a symlink in debian/ pointing to misc/. The default
options for "tar --transform" break this link, as the transformation is also
applied to the symlink target. So we have to tell tar to ignore symlink targets
for this command.

Makefile

@@ -228,7 +228,7 @@ tgz:
 		$(if $(GITHEAD),$(if $(GITDIFF),,--pax-option=comment=$(GITHEAD))) \
 		$(tgz-extra-files) \
 		-T .filelist \
-		--transform 's,^,drbd-$(FDIST_VERSION)/,' \
+		--transform 's,^,drbd-$(FDIST_VERSION)/,S' \
 		> drbd-$(FDIST_VERSION).tar.gz
 
 ifeq ($(FORCE),)

debian/drbd-dkms.dkms

@@ -0,0 +1 @@
+../misc/dkms.conf

drbd-kernel.spec

@@ -6,8 +6,10 @@ Release: 1
 # always require a suitable userland
 Requires: drbd-utils >= 9.27.0
 
+# Store the version, as later macros may mangle it
+%global drbd_version %version
 %global tarball_version %(echo "%{version}" | sed -e "s,%{?dist}$,," -e "s,~,-,")
-Source: http://oss.linbit.com/drbd/drbd-%{tarball_version}.tar.gz
+Source: http://pkg.linbit.com/downloads/drbd/9/drbd-%{tarball_version}.tar.gz
 
 License: GPLv2+
 Group: System Environment/Kernel
@@ -27,6 +29,9 @@ BuildRequires: %kernel_module_package_buildreqs
 # rpmbuild --with gcov to set GCOV_PROFILE=y for make
 %bcond_with gcov
 
+# rpmbuild --with dkms to build drbd-dkms package
+%bcond_with dkms
+
 # rpmbuild --define "ofed_kernel_dir /usr/src/ofa_kernel/x86_64/4.18.0-147.5.1..."
 # to build against an some mlnx-ofa_kernel-devel
 %if %{defined ofed_kernel_dir}
@@ -38,6 +43,19 @@ BuildRequires: %kernel_module_package_buildreqs
 %global dash_ofed -ofed
 %endif
 
+%if %{with dkms}
+# Define this package here before kernel macros mess with the version
+%package -n drbd-dkms
+Summary: %{summary}
+BuildArch: noarch
+Requires: dkms
+Requires: /usr/bin/diff
+Requires: /usr/bin/patch
+
+%description -n drbd-dkms
+This package contains the sources for DRBD for building with DKMS.
+%endif
+
 %description
 This package contains the kernel modules
 for the DRBD core and various transports.
@@ -174,9 +192,34 @@ xargs -r printf "override %%-16s * weak-updates/%%s\n" \
 install -D misc/SECURE-BOOT-KEY-linbit.com.der $RPM_BUILD_ROOT/etc/pki/linbit/SECURE-BOOT-KEY-linbit.com.der
 %endif
 
+%if %{with dkms}
+# For DKMS, install the original source
+%{__install} -d %{buildroot}%{_usrsrc}/drbd-%{drbd_version}-%{release}/src
+%{__install} misc/dkms.conf %{buildroot}%{_usrsrc}/drbd-%{drbd_version}-%{release}/dkms.conf
+tar -xvf %{S:0} -C %{buildroot}%{_usrsrc}/drbd-%{drbd_version}-%{release}/src --strip-components=1 drbd-%{tarball_version}/drbd
+%endif
+
 %clean
 rm -rf %{buildroot}
 
+%if %{with dkms}
+%files -n drbd-dkms
+%{_usrsrc}/drbd-%{drbd_version}-%{release}
+
+%post -n drbd-dkms
+DKMS_NAME=drbd
+DKMS_VERSION=%{drbd_version}-%{release}
+if [ $1 -gt 1 ] ; then
+	UPGRADE="1"
+fi
+/usr/lib/dkms/common.postinst $DKMS_NAME $DKMS_VERSION /usr/share/$DKMS_NAME-$DKMS_VERSION "" $UPGRADE
+
+%preun -n drbd-dkms
+DKMS_NAME=drbd
+DKMS_VERSION=%{drbd_version}-%{release}
+dkms remove -m $DKMS_NAME -v $DKMS_VERSION --all
+%endif
+
 %changelog
 * Mon Nov 18 2024 Philipp Reisner <[email protected]> - 9.2.12
 -  New upstream release.

misc/dkms.conf

@@ -0,0 +1,39 @@
+PACKAGE_VERSION="#MODULE_VERSION#"
+PACKAGE_NAME="drbd"
+MAKE="make -C src/drbd KDIR=/lib/modules/$kernelver/build"
+CLEAN="make -C src/drbd clean KDIR=/lib/modules/$kernelver/build"
+AUTOINSTALL="yes"
+
+BUILT_MODULE_NAME[0]="drbd"
+BUILT_MODULE_NAME[1]="drbd_transport_tcp"
+BUILT_MODULE_NAME[2]="drbd_transport_lb-tcp"
+BUILT_MODULE_LOCATION[0]="./src/drbd/build-current/"
+BUILT_MODULE_LOCATION[1]="./src/drbd/build-current/"
+BUILT_MODULE_LOCATION[2]="./src/drbd/build-current/"
+DEST_MODULE_LOCATION[0]="/kernel/drivers/block/drbd"
+DEST_MODULE_LOCATION[1]="/kernel/drivers/block/drbd"
+DEST_MODULE_LOCATION[2]="/kernel/drivers/block/drbd"
+
+IDX=3
+
+if grep -q ^CONFIG_INFINIBAND= /lib/modules/$kernelver/build/.config; then
+BUILT_MODULE_NAME[$IDX]="drbd_transport_rdma"
+BUILT_MODULE_LOCATION[$IDX]="./src/drbd/build-current/"
+DEST_MODULE_LOCATION[$IDX]="/kernel/drivers/block/drbd"
+IDX=$(($IDX + 1))
+fi
+
+test -z $BUILD_OFED &&
+test -e /usr/src/ofa_kernel/default/Module.symvers &&
+modinfo mlx_compat &>/dev/null &&
+MAKE+=" BUILD_OFED=1"
+
+# See drbd/Kbuild: this is that check for the kernel version, but worse: check for kernel >= 4.17
+IFS=".-" read -ra KVER <<< "$kernelver"
+if [ "${KVER[0]}" -ge 4 ] && ( [ "${KVER[0]}" -gt 4 ] || [ "${KVER[1]}" -ge 17 ] ) ; then
+if grep -q ^CONFIG_TLS= /lib/modules/$kernelver/build/.config && ! grep -q ^CONFIG_NET_HANDSHAKE= /lib/modules/$kernelver/build/.config ; then
+BUILT_MODULE_NAME[$IDX]="handshake"
+BUILT_MODULE_LOCATION[$IDX]="./src/drbd/build-current/drbd-kernel-compat/handshake"
+DEST_MODULE_LOCATION[$IDX]="/kernel/net/handshake"
+fi
+fi