[UNSTABLE][PATCH 1/2] UBUNTU: [Packaging] add rules to build FIT image

[Shrirang Bagul]

BugLink: https://bugs.launchpad.net/bugs/1847969

Add a fit_signed option and a script so we can build FIT images that
will be eventually signed.

Based on commit (in Bionic):
44efa9e736 UBUNTU: [Packaging] add rules to build FIT image

Signed-off-by: Alfonso Sánchez-Beato <alfonso.sanchez-beato at canonical.com>
Signed-off-by: Shrirang Bagul <shrirang.bagul at canonical.com>
---
 debian/rules                    |  2 +-
 debian/rules.d/1-maintainer.mk  |  1 +
 debian/rules.d/2-binary-arch.mk | 14 ++++++++++++
 debian/scripts/build-fit        | 40 +++++++++++++++++++++++++++++++++
 4 files changed, 56 insertions(+), 1 deletion(-)
 create mode 100755 debian/scripts/build-fit

diff --git a/debian/rules b/debian/rules
index 8cb6604e18db..9281de598b03 100755
--- a/debian/rules
+++ b/debian/rules
@@ -49,7 +49,7 @@ ifneq ($(DEB_HOST_ARCH),$(DEB_BUILD_ARCH))
 endif
 
 # Are any of the kernel signing options enabled.
-any_signed=$(sort $(filter-out false,$(uefi_signed) $(opal_signed) $(sipl_signed)))
+any_signed=$(sort $(filter-out false,$(uefi_signed) $(opal_signed) $(sipl_signed) $(fit_signed)))
 ifeq ($(any_signed),true)
 bin_pkg_name=$(bin_pkg_name_unsigned)
 else
diff --git a/debian/rules.d/1-maintainer.mk b/debian/rules.d/1-maintainer.mk
index 6b4e0901c288..f20f537e1364 100644
--- a/debian/rules.d/1-maintainer.mk
+++ b/debian/rules.d/1-maintainer.mk
@@ -94,6 +94,7 @@ printenv:
 	@echo " uefi_signed               = $(uefi_signed)"
 	@echo " opal_signed               = $(opal_signed)"
 	@echo " sipl_signed               = $(sipl_signed)"
+	@echo " fit_signed               = $(fit_signed)"
 	@echo "full_build                = $(full_build)"
 	@echo "libc_dev_version          = $(libc_dev_version)"
 	@echo "DEB_HOST_GNU_TYPE         = $(DEB_HOST_GNU_TYPE)"
diff --git a/debian/rules.d/2-binary-arch.mk b/debian/rules.d/2-binary-arch.mk
index 82e4d80e469f..f3279369c3a7 100644
--- a/debian/rules.d/2-binary-arch.mk
+++ b/debian/rules.d/2-binary-arch.mk
@@ -478,6 +478,20 @@ endif
 	install -m644 $(abidir)/$*.compiler \
 		$(pkgdir_bldinfo)/usr/lib/linux/$(abi_release)-$*/compiler
 
+ifeq ($(fit_signed),true)
+	install -d $(signingv)
+	cp -p $(pkgdir_bin)/boot/$(instfile)-$(abi_release)-$* \
+		$(signingv)/$(instfile)-$(abi_release)-$*;
+	# Build FIT image now that the modules folder exists
+	$(SHELL) $(DROOT)/scripts/build-fit \
+		$(CURDIR)/$(DEBIAN)/$(fit_its) \
+		"$(foreach f, $(fit_dtb_files), $(builddir)/build-$*/$(f))" \
+		$(abi_release)-$(target_flavour) \
+		$(CURDIR)/$(DROOT)/linux-modules-$(abi_release)-$* \
+		$(signingv)
+	cp -p $(signingv)/fit-$(abi_release)-$*.fit $(pkgdir_bin)/boot/
+endif
+
 headers_tmp := $(CURDIR)/debian/tmp-headers
 headers_dir := $(CURDIR)/debian/linux-libc-dev
 
diff --git a/debian/scripts/build-fit b/debian/scripts/build-fit
new file mode 100755
index 000000000000..09292611e39d
--- /dev/null
+++ b/debian/scripts/build-fit
@@ -0,0 +1,40 @@
+#!/bin/sh -e
+# Creates a FIT image
+# $1: ITS file (FIT components description)
+# $2: list of space-separated dtb files
+# $3: kernel version
+# $4: kernel modules directory
+# $5: destination directory
+
+. debian/debian.env
+
+echo "Creating FIT image"
+fit_its="$1"
+dtb_files="$2"
+KERNEL_VERSION="$3"
+KERNEL_MODULES_D="$4"
+dest_d="$5"
+
+set -x
+fit_d=$dest_d
+mkdir -p "$fit_d"
+# Export variables to be used by hooks
+export KERNEL_VERSION
+export KERNEL_MODULES_D
+initrd_f=initrd.img
+mkinitramfs -o "$initrd_f"
+mv "$initrd_f" "$fit_d"
+
+mkdir -p "$fit_d"/dtbs/
+for dtb in $dtb_files; do
+    cp -f "$dtb" "$fit_d"/dtbs/
+done
+
+cp -f "$dest_d"/vmlinuz-* "$fit_d"/zImage
+cp -f "$fit_its" "$fit_d"
+
+cd "$fit_d"
+mkimage -D "-I dts -O dtb -p 2000" -f "${fit_its##*/}" fit-"$KERNEL_VERSION".fit
+cd -
+
+rm -rf "$fit_d"/"$initrd_f" "$fit_d"/dtbs/ "$fit_d"/zImage "$fit_d"/"${fit_its##*/}"
-- 
2.17.1