[Unstable][PATCH 6/6] UBUNTU: [Debian]: dkms-build: zfs: support for debug symbols

[Mauricio Faria de Oliveira]

BugLink: https://bugs.launchpad.net/bugs/1840704

Add support to enable debug symbols on ZFS in 'dkms-build',
and specify the debug package directory path in the rules.

It's a bit ugly that a change for a particular package is
in the generic build script, but unfortunately this seems
to be less intrusive than other options (eg, rely on file
in /etc/ which needs privileged permissions on build time;
or patch zfs-linux/dkms.conf to detect kernel build time.)

And it seemed short enough not to create 'pre processors'.

Signed-off-by: Mauricio Faria de Oliveira <mfo at canonical.com>
---
 debian/rules.d/2-binary-arch.mk |  3 ++-
 debian/scripts/dkms-build       | 10 ++++++++++
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/debian/rules.d/2-binary-arch.mk b/debian/rules.d/2-binary-arch.mk
index 90396689de2d..ca55df647120 100644
--- a/debian/rules.d/2-binary-arch.mk
+++ b/debian/rules.d/2-binary-arch.mk
@@ -108,6 +108,7 @@ install-%: MODPUBKEY=$(builddir)/build-$*/certs/signing_key.x509
 install-%: build_dir=$(builddir)/build-$*
 install-%: dkms_dir=$(call dkms_dir_prefix,$(builddir)/build-$*)
 install-%: enable_zfs = $(call custom_override,do_zfs,$*)
+install-%: dbgpkgdir_zfs = $(if $(filter false,$(skipdbg)),$(dbgpkgdir)/usr/lib/debug/lib/modules/$(abi_release)-$*/kernel,"")
 install-%: $(stampdir)/stamp-build-% install-headers
 	@echo Debug: $@ kernel_file $(kernel_file) kernfile $(kernfile) install_file $(install_file) instfile $(instfile)
 	dh_testdir
@@ -390,7 +391,7 @@ endif
 	install -d $(dkms_dir) $(dkms_dir)/headers $(dkms_dir)/build $(dkms_dir)/source
 	cp -rp "$(hdrdir)" "$(indep_hdrdir)" "$(dkms_dir)/headers"
 
-	$(if $(filter true,$(enable_zfs)),$(call build_dkms, $(mods_pkg_name)-$*, $(pkgdir)/lib/modules/$(abi_release)-$*/kernel, "", zfs, pool/universe/z/zfs-linux/zfs-dkms_$(dkms_zfs_linux_version)_all.deb))
+	$(if $(filter true,$(enable_zfs)),$(call build_dkms, $(mods_pkg_name)-$*, $(pkgdir)/lib/modules/$(abi_release)-$*/kernel, $(dbgpkgdir_zfs), zfs, pool/universe/z/zfs-linux/zfs-dkms_$(dkms_zfs_linux_version)_all.deb))
 
 ifeq ($(do_dkms_nvidia),true)
 	$(call build_dkms, $(bldinfo_pkg_name)-$*, $(pkgdir_bldinfo)/usr/lib/linux/$(abi_release)-$*/signatures, "", nvidia-390, pool/restricted/n/nvidia-graphics-drivers-390/nvidia-kernel-source-390_$(dkms_nvidia_390_version)_$(arch).deb pool/restricted/n/nvidia-graphics-drivers-390/nvidia-dkms-390_$(dkms_nvidia_390_version)_$(arch).deb)
diff --git a/debian/scripts/dkms-build b/debian/scripts/dkms-build
index f77063f7b745..ce587dcbd489 100755
--- a/debian/scripts/dkms-build
+++ b/debian/scripts/dkms-build
@@ -85,10 +85,20 @@ for dkms_conf in "$package/usr/src"/*/"dkms.conf"
 do
 	break
 done
+
 # It seems some packages have a # in the name which works fine if the
 # package is installed directly, but not so much if we build it out
 # of the normal location.
 sed -i -e '/^PACKAGE_NAME=/ s/#//g' "$dkms_conf"
+
+# ZFS debug symbols are enabled in dkms.conf via PACKAGE_CONFIG file.
+if [ -n "$dbgpkgdir" ] && [ "$package" = 'zfs' ]; then
+	pkg_cfg="$(dirname "$dkms_conf")/pkg_cfg"
+	echo 'ZFS_DKMS_ENABLE_DEBUGINFO=yes' >"$pkg_cfg"
+	echo 'ZFS_DKMS_DISABLE_STRIP=yes'   >>"$pkg_cfg"
+	sed -i "s,^\(PACKAGE_CONFIG=\).*,\1$pkg_cfg," $dkms_conf
+fi
+
 cat - <<'EOF' >>"$dkms_conf"
 POST_BUILD="ubuntu-save-objects ${dkms_tree}/${PACKAGE_NAME}/${PACKAGE_VERSION}/build ${dkms_tree}/${PACKAGE_NAME}/${PACKAGE_VERSION}/objects $POST_BUILD"
 EOF
-- 
2.17.1