From c6e54f9d1a3cdabc8220eaf32209792450abf938 Mon Sep 17 00:00:00 2001
From: Michael Tremer <michael.tremer@ipfire.org>
Date: Tue, 18 May 2021 15:41:40 +0000
Subject: [PATCH] master: Install kernel and create an initramdisk

The initramdisk is very minimal and will only come with some basic
kernel modules as well as scripts to mount the squashfs and jump into
it.

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>
---
 src/bricklayer-master | 68 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 68 insertions(+)

diff --git a/src/bricklayer-master b/src/bricklayer-master
index 9f4908f..b2918c8 100644
--- a/src/bricklayer-master
+++ b/src/bricklayer-master
@@ -25,6 +25,7 @@ PAKFIRE_CONFIG="/etc/pakfire/distros/ipfire3.conf"
 # Packages to install in the live system
 PACKAGES=(
 	"@Base"
+	"dracut"
 	"kernel"
 )
 
@@ -32,6 +33,7 @@ BUILDSYSTEM_PACKAGES=(
 	"@Base"
 	"dracut"
 	"grub"
+	"dmsetup"
 )
 
 # Compress as best as we can
@@ -201,6 +203,60 @@ make_grub_efi_image() {
 	return 0
 }
 
+find_kernel_release() {
+	local file
+	for file in ${buildsystem}/usr/lib/modules/*; do
+		if [ -d "${file}" ]; then
+			basename "${file}"
+			return 0
+		fi
+	done
+
+	return 1
+}
+
+install_kernel_image() {
+	local filename="${1}"
+
+	# Find kernel release
+	local kernel_release="$(find_kernel_release)"
+
+	cp "${buildsystem}/boot/vmlinuz-${kernel_release}" "${filename}"
+}
+
+install_initramfs() {
+	local filename="${1}"
+
+	# Find kernel release
+	local kernel_release="$(find_kernel_release)"
+
+	local args=(
+		--verbose
+
+		# Generate a ramdisk that can run on many hosts
+		--no-hostonly
+
+		--kmoddir "/usr/lib/modules/${kernel_release}"
+
+		# Add the live image module to mount our squashfs system
+		--add "dmsquash-live"
+
+		# Only enable these modules
+		--modules "base kernel-modules"
+
+		# Add support for squashfs
+		--filesystems "squashfs"
+	)
+
+	if ! in_buildsystem --bind="${tempdir}" \
+			dracut "${args[@]}" "${filename}" "${kernel_release}" &>/tmp/dracut.$$; then
+		unlink "${filename}"
+		return 1
+	fi
+
+	return 0
+}
+
 mkimage() {
 	local filename="${1}"
 	local r=0
@@ -293,6 +349,18 @@ mkimage() {
 		)
 	fi
 
+	# Install the kernel image
+	if ! install_kernel_image "${tempdir}/boot/vmlinuz"; then
+		rm rf "${tempdir}"
+		return 1
+	fi
+
+	# Create live ramdisk
+	if ! install_initramfs "${tempdir}/boot/initramfs.img"; then
+		rm -rf "${tempdir}"
+		return 1
+	fi
+
 	# Create the live system image
 	if ! make_live_system_image "${tempdir}/live-os.img"; then
 		rm -rf "${tempdir}"
-- 
2.47.3