[2/3,SRU,Jammy] UBUNTU: support v4l2loopback dkms build

diff --git a/debian/rules b/debian/rules
index 16a069766e59..eca69cdc98a3 100755
--- a/debian/rules
+++ b/debian/rules
@@ -75,6 +75,7 @@  endif
 ifneq ($(filter autopkgtest,$(DEB_BUILD_PROFILES)),)
 	flavours := $(firstword $(flavours))
 	do_zfs=false
+	do_v4l2loopback=false
 endif
 
 # Being used to build a mainline build -- turn off things which do not work.
@@ -100,6 +101,10 @@  ifeq ($(do_zfs),false)
 	do_zfs_disable:=$(shell for m in $$(cat $(DROOT)/zfs-modules.ignore); do grep -qxF $$m $(prev_abidir)/../modules.ignore 2>/dev/null || echo $$m >> $(prev_abidir)/../modules.ignore; done)
 endif
 
+ifeq ($(do_v4l2loopback),false)
+	do_v4l2loopback_disable:=$(shell for m in $$(cat $(DROOT)/v4l2loopback-modules.ignore); do grep -qxF $$m $(prev_abidir)/../modules.ignore 2>/dev/null || echo $$m >> $(prev_abidir)/../modules.ignore; done)
+endif
+
 ifeq ($(do_dkms_wireguard),false)
 	do_wireguard_disable:=$(shell for m in $$(cat $(DROOT)/wireguard-modules.ignore); do grep -qxF $$m $(prev_abidir)/../modules.ignore 2>/dev/null || echo $$m >> $(prev_abidir)/../modules.ignore; done)
 endif
@@ -109,6 +114,7 @@  do_any_tools=$(sort $(filter-out false,$(do_linux_tools) $(do_cloud_tools)))
 
 # Versions of dkms packages.
 dkms_zfs_linux_version=$(shell gawk '/^zfs-linux / { print $$2; }' debian/dkms-versions)
+dkms_v4l2loopback_version=$(shell gawk '/^v4l2loopback / { print $$2; }' debian/dkms-versions)
 
 # NVIDIA DKMS package gross series split into desktop and server.
 nvidia_desktop_series=$(shell sed -n -e 's/^nvidia-graphics-drivers-\([0-9][0-9]*\) .*/\1/p' debian/dkms-versions)
diff --git a/debian/rules.d/2-binary-arch.mk b/debian/rules.d/2-binary-arch.mk
index 996512f9ce0b..773da8e05a0e 100644
--- a/debian/rules.d/2-binary-arch.mk
+++ b/debian/rules.d/2-binary-arch.mk
@@ -118,7 +118,8 @@  $(stampdir)/stamp-install-%: MODPUBKEY=$(builddir)/build-$*/certs/signing_key.x5
 $(stampdir)/stamp-install-%: build_dir=$(builddir)/build-$*
 $(stampdir)/stamp-install-%: dkms_dir=$(call dkms_dir_prefix,$(builddir)/build-$*)
 $(stampdir)/stamp-install-%: enable_zfs = $(call custom_override,do_zfs,$*)
-$(stampdir)/stamp-install-%: dbgpkgdir_zfs = $(if $(filter true,$(skipdbg)),"",$(dbgpkgdir)/usr/lib/debug/lib/modules/$(abi_release)-$*/kernel)
+$(stampdir)/stamp-install-%: enable_v4l2loopback = $(call custom_override,do_v4l2loopback,$*)
+$(stampdir)/stamp-install-%: dbgpkgdir_dkms = $(if $(filter true,$(skipdbg)),"",$(dbgpkgdir)/usr/lib/debug/lib/modules/$(abi_release)-$*/kernel)
 $(stampdir)/stamp-install-%: $(stampdir)/stamp-build-% $(stampdir)/stamp-install-headers
 	@echo Debug: $@ kernel_file $(kernel_file) kernfile $(kernfile) install_file $(install_file) instfile $(instfile)
 	dh_testdir
@@ -411,7 +412,9 @@  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, $(dbgpkgdir_zfs), zfs, pool/universe/z/zfs-linux/zfs-dkms_$(dkms_zfs_linux_version)_all.deb))
+	$(if $(filter true,$(enable_zfs)),$(call build_dkms, $(mods_pkg_name)-$*, $(pkgdir)/lib/modules/$(abi_release)-$*/kernel, $(dbgpkgdir_dkms), zfs, pool/universe/z/zfs-linux/zfs-dkms_$(dkms_zfs_linux_version)_all.deb))
+	$(if $(filter true,$(enable_v4l2loopback)),$(call build_dkms, $(mods_pkg_name)-$*, $(pkgdir)/lib/modules/$(abi_release)-$*/kernel, $(dbgpkgdir_dkms), v4l2loopback, pool/universe/v/v4l2loopback/v4l2loopback-dkms_$(dkms_v4l2loopback_version)_all.deb))
+
 
 ifneq ($(skipdbg),true)
 	# Add .gnu_debuglink sections to each stripped .ko
@@ -583,7 +586,8 @@  binary-%: dbgpkg = $(bin_pkg_name)-$*-dbgsym
 binary-%: dbgpkgdir = $(CURDIR)/debian/$(bin_pkg_name)-$*-dbgsym
 binary-%: pkgtools = $(tools_flavour_pkg_name)-$*
 binary-%: pkgcloud = $(cloud_flavour_pkg_name)-$*
-binary-%: rprovides = $(if $(filter true,$(call custom_override,do_zfs,$*)),spl-modules$(comma) spl-dkms$(comma) zfs-modules$(comma) zfs-dkms$(comma))
+binary-%: rprovides = $(if $(filter true,$(call custom_override,do_zfs,$*)),spl-modules$(comma) spl-dkms$(comma) zfs-modules$(comma) zfs-dkms$(comma)) \
+		$(if $(filter true,$(call custom_override,do_v4l2loopback,$*)),v4l2loopback-modules$(comma) v4l2loopback-dkms$(comma))
 binary-%: target_flavour = $*
 binary-%: checks-%
 	@echo Debug: $@
diff --git a/debian/v4l2loopback-modules.ignore b/debian/v4l2loopback-modules.ignore
new file mode 100644
index 000000000000..d394e47bc819
--- /dev/null
+++ b/debian/v4l2loopback-modules.ignore
@@ -0,0 +1 @@ 
+v4l2loopback