From c02b9b90d896a580ed54c83cf13087e38e1cb8ee Mon Sep 17 00:00:00 2001
From: ColorfulRhino <131405023+ColorfulRhino@users.noreply.github.com>
Date: Sun, 10 Mar 2024 13:29:14 +0100
Subject: [PATCH] build script: configuration: Check if ROOTFS_TYPE is
 supported by build host

---
 lib/functions/configuration/main-config.sh | 39 ++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/lib/functions/configuration/main-config.sh b/lib/functions/configuration/main-config.sh
index acc68fbae5..d8b6a61edb 100644
--- a/lib/functions/configuration/main-config.sh
+++ b/lib/functions/configuration/main-config.sh
@@ -138,6 +138,45 @@ function do_main_configuration() {
 			;;
 	esac
 
+	# Check if the filesystem type is supported by the build host
+	if [[ $CONFIG_DEFS_ONLY != yes ]]; then # don't waste time if only gathering config defs
+		if [[ -f "/proc/filesystems" ]]; then
+			# Check if the filesystem is listed in /proc/filesystems
+			if ! grep -q "\<$ROOTFS_TYPE\>" /proc/filesystems; then		# ensure exact match with \<...\>
+				# Try modprobing the fs module since it doesn't show up in /proc/filesystems if it's an unloaded module versus built-in
+				if ! modprobe "$ROOTFS_TYPE"; then
+					exit_with_error "Filesystem type unsupported by build host:" "$ROOTFS_TYPE"
+				else
+					display_alert "Sucessfully loaded kernel mopdule for filesystem" "$ROOTFS_TYPE" ""
+				fi
+			fi
+
+			# For f2fs, check if support for extended attributes is enabled in kernel config (otherwise will fail later when using rsync)
+			if [ "$ROOTFS_TYPE" = "f2fs" ]; then
+				local build_host_kernel_config=""
+				# Try to find kernel config in different places
+				if [ -f "/boot/config-$(uname -r)" ]; then
+					build_host_kernel_config="/boot/config-$(uname -r)"
+				elif [ -f "/proc/config.gz" ]; then
+					pigz -dc /proc/config.gz > /tmp/build_host_kernel_config # use pigz since it's a host dependency listed in prepare-host.sh
+					build_host_kernel_config="/tmp/build_host_kernel_config"
+				else
+					display_alert "Could not find kernel config of build host." "Build might fail in case of missing kernel configs for '${ROOTFS_TYPE}'." "wrn"
+				fi
+
+				# Check if required configurations are set
+				if [ -n "$build_host_kernel_config" ]; then
+					if ! grep -q '^CONFIG_F2FS_FS_XATTR=y$' "$build_host_kernel_config" || \
+					! grep -q '^CONFIG_F2FS_FS_SECURITY=y$' "$build_host_kernel_config"; then
+						exit_with_error "Required kernel configurations for f2fs filesystem not enabled." "Please enable CONFIG_F2FS_FS_XATTR and CONFIG_F2FS_FS_SECURITY in your kernel configuration." "err"
+					fi
+				fi
+			fi
+		else
+			display_alert "Could not check filesystem support via /proc/filesystems on build host." "Build might fail in case of unsupported rootfs type." "wrn"
+		fi
+	fi
+
 	# Support for LUKS / cryptroot
 	if [[ $CRYPTROOT_ENABLE == yes ]]; then
 		enable_extension "fs-cryptroot-support" # add the tooling needed, cryptsetup