Add functions for more precise, by number, kernel comparisson

debian-config-functions

@@ -52,6 +52,63 @@ function main(){
 
 
 
+#
+# compare two strings in dot separated version format
+#
+vercomp () {
+    if [[ $1 == $2 ]]
+    then
+        return 0
+    fi
+    local IFS=.
+    local i ver1=($1) ver2=($2)
+    # fill empty fields in ver1 with zeros
+    for ((i=${#ver1[@]}; i<${#ver2[@]}; i++))
+    do
+        ver1[i]=0
+    done
+    for ((i=0; i<${#ver1[@]}; i++))
+    do
+        if [[ -z ${ver2[i]} ]]
+        then
+            # fill empty fields in ver2 with zeros
+            ver2[i]=0
+        fi
+        if ((10#${ver1[i]} > 10#${ver2[i]}))
+        then
+            return 1
+        fi
+        if ((10#${ver1[i]} < 10#${ver2[i]}))
+        then
+            return 2
+        fi
+    done
+    return 0
+}
+
+
+
+
+#
+# test compare two strings $1="3.4.12" $2="5.4.2" $3="<" returns 0 if relation is correct
+#
+testvercomp () {
+    vercomp $1 $2
+    case $? in
+        0) op='=';;
+        1) op='>';;
+        2) op='<';;
+    esac
+    if [[ $op != $3 ]]
+    then
+		return 1
+    else
+		return 0
+    fi
+}
+
+
+
 
 #
 # read desktop parameters

debian-config-submenu

@@ -63,7 +63,9 @@ while true; do
 	[[ -d ${OVERLAYDIR} ]] && \
 	LIST+=( "Hardware" "Toggle hardware configuration: UART, I2C, etc." )
 	[[ "$LINUXFAMILY" = cubox && "$BRANCH" = "next" ]] && LIST+=( "DTB" "Switch board .dtb configuration" )
-	[[ "$LINUXFAMILY" = odroidxu4 && "$BRANCH" = "next" ]] && LIST+=( "DTB" "Select optimised board configuration" )
+	# this is avaliable only in kernel higher than 4.10
+	testvercomp "$(uname -r | sed 's/-.*//')" "4.10.0" ">"
+	[[ "$LINUXFAMILY" = odroidxu4 && $? == 0 ]] && LIST+=( "DTB" "Select optimised board configuration" )
 	[[ -f /usr/bin/bin2fex && "$LINUXFAMILY" = sun*i && "$BRANCH" = "default" ]] && LIST+=( "Fexedit" "Board (fex) settings editor" )
 	[[ $(apt-cache search --names-only '^linux-'$(lsb_release  -cs)'-root.*.'$BOARD'' | sed 's/.*(\(.*\))/\1/' | awk '{print $1}' \
 	| wc -l) -gt 1 && -z "${mark}" ]] && LIST+=( "Switch" "Switch to alternative kernels" )