gen_initramfs.sh: create_initramfs(): Fix integrated initramfs creation

- CONFIG_INITRAMFS_SOURCE value must be quoted.

- CONFIG_INITRAMFS_COMPRESSION_* is only available in >=linux-4.10.

- Use CONFIG_RD_* for <linux-4.10. But make sure that only option for
  selected compression type is set and every other type is disabled.
  Otherwise, last set compression type would be used all the time,
  see $KERNEL_DIR/usr/Makefile for details.

- Add sanity check which checks for integrated initramfs.

Bug: https://bugs.gentoo.org/703826
Signed-off-by: Thomas Deutschmann <whissi@gentoo.org>

2 files changed, 26 insertions, 2 deletions

diff --git a/gen_initramfs.sh b/gen_initramfs.sh
index 38c77d02..283e3082 100755
--- a/gen_initramfs.sh
+++ b/gen_initramfs.sh
@@ -1890,7 +1890,8 @@ create_initramfs() {
 		print_info 1 "$(get_indent 1)>> --integrated-initramfs is set; Setting CONFIG_INITRAMFS_* options ..."
 
 		[ -f "${KCONFIG_MODIFIED_MARKER}" ] && rm "${KCONFIG_MODIFIED_MARKER}"
-		kconfig_set_opt "${KERNEL_OUTPUTDIR}/.config" "CONFIG_INITRAMFS_SOURCE" "${CPIO_ARCHIVE}.cpio"
+		kconfig_set_opt "${KERNEL_OUTPUTDIR}/.config" "CONFIG_BLK_DEV_INITRD" "y"
+		kconfig_set_opt "${KERNEL_OUTPUTDIR}/.config" "CONFIG_INITRAMFS_SOURCE" "\"${CPIO_ARCHIVE}.cpio\""
 		kconfig_set_opt "${KERNEL_OUTPUTDIR}/.config" "CONFIG_INITRAMFS_ROOT_UID" "0"
 		kconfig_set_opt "${KERNEL_OUTPUTDIR}/.config" "CONFIG_INITRAMFS_ROOT_GID" "0"
 
@@ -1904,7 +1905,23 @@ create_initramfs() {
 				KOPTION_VALUE=y
 			fi
 
-			kconfig_set_opt "${KERNEL_OUTPUTDIR}/.config" "CONFIG_INITRAMFS_COMPRESSION_${KNOWN_INITRAMFS_COMPRESSION_TYPE}" "${KOPTION_VALUE}"
+			if [ ${KV_NUMERIC} -ge 4010 ]
+			then
+				kconfig_set_opt "${KERNEL_OUTPUTDIR}/.config" "CONFIG_INITRAMFS_COMPRESSION_${KNOWN_INITRAMFS_COMPRESSION_TYPE}" "${KOPTION_VALUE}"
+
+				if [[ "${KOPTION_VALUE}" == "y" && "${KNOWN_INITRAMFS_COMPRESSION_TYPE}" != "NONE" ]]
+				then
+					# Make sure that the kernel can decompress our initramfs
+					kconfig_set_opt "${KERNEL_OUTPUTDIR}/.config" "CONFIG_RD_${KNOWN_INITRAMFS_COMPRESSION_TYPE}" "${KOPTION_VALUE}"
+				fi
+			else
+				[[ "${KNOWN_INITRAMFS_COMPRESSION_TYPE}" == "NONE" ]] && continue
+
+				# In <linux-4.10, to control used initramfs compression, we have to
+				# disable every supported compression type except compression type
+				# we want to use, (see $KERNEL_DIR/usr/Makefile).
+				kconfig_set_opt "${KERNEL_OUTPUTDIR}/.config" "CONFIG_RD_${KNOWN_INITRAMFS_COMPRESSION_TYPE}" "${KOPTION_VALUE}"
+			fi
 		done
 
 		if [ -f "${KCONFIG_MODIFIED_MARKER}" ]
diff --git a/genkernel b/genkernel
index 93f670e1..3d256346 100755
--- a/genkernel
+++ b/genkernel
@@ -364,6 +364,13 @@ if isTrue "${INTEGRATED_INITRAMFS}"
 then
 	print_info 1 '' 1 0
 
+	cfg_CONFIG_INITRAMFS_SOURCE=$(kconfig_get_opt "${KERNEL_OUTPUTDIR}/.config" "CONFIG_INITRAMFS_SOURCE")
+	if [[ "${cfg_CONFIG_INITRAMFS_SOURCE}" != "\"${CPIO_ARCHIVE}.cpio\"" ]]
+	then
+		gen_die "Sanity check failed: CONFIG_INITRAMFS_SOURCE is not set to '${CPIO_ARCHIVE}.cpio' in '${KERNEL_OUTPUTDIR}/.config'!"
+	fi
+	unset cfg_CONFIG_INITRAMFS_SOURCE
+
 	# We build the kernel a second time to include the initramfs
 	compile_kernel
 fi