From 0a257fda5e14b5a5719478568a426cf4b27fa405 Mon Sep 17 00:00:00 2001
From: Igor Pecovnik <igor@armbian.com>
Date: Wed, 11 Dec 2024 18:11:31 +0100
Subject: [PATCH] Compare needs to be quoted else it throws error on empty

---
 tools/json/config.system.json                    | 2 +-
 tools/modules/functions/set_runtime_variables.sh | 9 +++++++--
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/tools/json/config.system.json b/tools/json/config.system.json
index 134288903..6be7d4535 100644
--- a/tools/json/config.system.json
+++ b/tools/json/config.system.json
@@ -94,7 +94,7 @@
                             ],
                             "status": "Stable",
                             "author": "@armbian",
-                            "condition": "! module_zfs status && linux-version compare ${KERNELID} le $(module_zfs kernel_max)"
+                            "condition": "! module_zfs status && linux-version compare \"${KERNELID}\" le \"$(module_zfs kernel_max)\""
                         },
                         {
                             "id": "SY221",
diff --git a/tools/modules/functions/set_runtime_variables.sh b/tools/modules/functions/set_runtime_variables.sh
index 87ca3d26e..96dcab053 100644
--- a/tools/modules/functions/set_runtime_variables.sh
+++ b/tools/modules/functions/set_runtime_variables.sh
@@ -66,8 +66,13 @@ function set_runtime_variables() {
 	[[ -z "${DEFAULT_ADAPTER// /}" ]] && DEFAULT_ADAPTER="lo"
 	# zfs subsystem - determine if our kernel is not too recent
 	ZFS_DKMS_VERSION=$(LC_ALL=C apt-cache policy zfs-dkms | grep Candidate | xargs | cut -d" " -f2 | cut -c-5)
-	ZFS_KERNEL_MAX=$(wget -qO- https://github.com/openzfs/zfs/raw/refs/tags/zfs-${ZFS_DKMS_VERSION}/META | grep Maximum | cut -d" " -f2)
-
+	ZFS_KERNEL_MAX=$(wget -qO- https://raw.githubusercontent.com/openzfs/zfs/refs/tags/zfs-${ZFS_DKMS_VERSION}/META | grep Maximum | cut -d" " -f2)
+	# sometimes Ubuntu sets higher version then existing tag. Lets probe previous version
+	if [[ -z "${ZFS_KERNEL_MAX}" ]]; then
+		local previous_version="$(printf "%03d" "$(expr "$(echo $ZFS_DKMS_VERSION | sed 's/\.//g')" - 1)")"
+		local previous_version=$(echo "${previous_version:0:1}.${previous_version:1:1}.${previous_version:2:1}")
+		ZFS_KERNEL_MAX=$(wget -qO- https://raw.githubusercontent.com/openzfs/zfs/refs/tags/zfs-${previous_version}/META | grep Maximum | cut -d" " -f2)
+	fi
 	# detect desktop
 	check_desktop