Support downloading the latest kernel with download_linux.sh

Author: gsingh93

scripts/download_linux.sh

@@ -18,12 +18,21 @@ fi
 if [ $ACK -eq 0 ]; then
     first_char=${VERSION:0:1}
 
+    # Strip any leading 'v'
     if [ $first_char == v ]; then
         VERSION=${VERSION:1}
     fi
-
     first_char=${VERSION:0:1}
 
+    # If patch version is 'y', we need to find the latest version of the major.minor release
+    last_char=${VERSION: -1:1}
+    if [ $last_char == y ]; then
+        major_minor=${VERSION: 0:-1}
+        VERSION=$(curl -s $LINUX_URL/v${first_char}.x/ | sed -e 's/<[^>]*>//g' | grep -oP "linux-${major_minor}[0-9]+" | sort -r -V | head -n1 | cut -d '-' -f2)
+    fi
+
+    echo "Downloading kernel version $VERSION"
+
     if [ $first_char -ge $MIN_VERSION ] && [ $first_char -le $MAX_VERSION ]; then
         wget $LINUX_URL/v${first_char}.x/linux-$VERSION.tar.xz
         tar -xf linux-$VERSION.tar.xz