From 8ba6511fcb5f747412255920ea953f58e563eb51 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Krizs=C3=A1n=20P=C3=A9ter?= <krizsan.peter@gmail.com>
Date: Mon, 25 Nov 2024 23:39:45 +0100
Subject: [PATCH] Added func_kernel.sh file

---
 libs/func_kernel.sh | 107 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 107 insertions(+)
 create mode 100644 libs/func_kernel.sh

diff --git a/libs/func_kernel.sh b/libs/func_kernel.sh
new file mode 100644
index 0000000..37b8dce
--- /dev/null
+++ b/libs/func_kernel.sh
@@ -0,0 +1,107 @@
+#!/bin/bash
+
+# Check md5 hash format
+__is_valid_md5_hash()
+{
+    case $1 in
+      ( *[!0-9A-Fa-f]* | "" ) return 1 ;;
+      ( * )                
+        case ${#1} in
+          ( 32 | 40 ) return 0 ;;
+          ( * )       return 1 ;;
+        esac
+    esac    
+  }
+
+
+# Helper function to pach the packages.ent
+# Parameters are in this order: major, minor, patch, md5 and full path to packages.ent
+_patch_packages_ent_kernel_version()
+{
+    # Check parameters
+    local number_regex='^[0-9]+$'
+    if ! [ "$1" =~ $number_regex ] ; then
+        echo "Invalid major version: $1" >&2
+        return 1
+    fi
+
+    if ! [ "$2" =~ $number_regex ] ; then
+        echo "Invalid minor version: $2" >&2
+        return 1
+    fi
+
+    if ! [ "$3" == "-" ] && ! [ "$3" =~ $number_regex ] ; then
+        echo "Invalid patch version: $3" >&2
+        return 1
+    fi
+
+    __is_valid_md5_hash "$4" || { echo "Invalid md5 hash: $4" >&2 ; return 1 ;}
+
+    if [ ! -f "$5" ] ; then
+        echo "Invalid or missing packages.ent file: $5" >&2
+        return 1
+    fi
+
+    sed -i -E "s@(<\!ENTITY linux-major-version \"+)(.+\">)@\1$1\">@" "$5"
+    sed -i -E "s@(<\!ENTITY linux-minor-version \"+)(.+\">)@\1$2\">@" "$5"    
+    sed -i -E "s@(<\!ENTITY linux-md5 \"+)(.+\">)@\1$4\">@" "$5"
+
+    if [ "-" == "$3" ] ; then
+        sed -i -E '/<!--/ n; /<\!ENTITY linux-patch-version "/{s/<!E/<!--<!E/g;s/">/">-->/g;}' "$5"
+        sed -i -E '/linux-minor-version;">-->/{s/<!--//g;s/-->//g;}' "$5"
+        sed -i -E '/<!--/ n; /linux-patch-version;">/{s/<!E/<!--<!E/g;s/;">/;">-->/g;}' "$5"
+    else
+        sed -i -E '/<!ENTITY linux-patch-version "/{s/<!--//g;s/-->//g;}' "$5"
+        sed -i -E "s@(<\!ENTITY linux-patch-version \"+)(.+\">)@\1$3\">@" "$5"
+        sed -i -E '/linux-patch-version;">-->/{s/<!--//g;s/-->//g;}' "$5"
+        sed -i -E '/<!--/ n; /linux-minor-version;">/{s/<!E/<!--<!E/g;s/;">/;">-->/g;}' "$5"
+    fi
+}
+
+
+# Determines the download link to the latest stable kernel tar ball.
+_get_latest_kernel_url()
+{
+    local url="$(curl -v --silent https://www.kernel.org/ 2>&1 | sed -n '/<td id="latest_link">/{n; p}' | cut -d '"' -f 2)"
+    if ! wget -q --spider "$url" ; then
+        echo "Failed to get latest kernel URL." >&2
+        return 1
+    fi
+    echo "$url"
+}
+
+
+# Determines the version number of the current latest stable kernel
+_get_latest_kernel_version()
+{
+    local url=$(_get_latest_kernel_url)
+    if [[ $? -gt 0 ]] ; then return 1; fi
+    local ver="$(cut -d '-' -f 2 <<< "$url" | rev | cut -c8- | rev)"
+    echo $ver
+}
+
+
+# Download latest kernel
+# We need here one parameter which is the download folder
+_download_latest_kernel()
+{
+    # Check parameter
+    if [ ! -d "$1" ] ; then
+        echo "Invalid or missing download folder: $1" >&2
+        return 1
+    fi
+
+    local url=$(_get_latest_kernel_url)
+    if [[ $? -gt 0 ]] ; then return 1; fi
+
+    # Download only if not there yet
+    local file_name="$(basename "$url")"
+    if [ ! -f "$1/$file_name" ] ; then
+        echo "Downloading kernel tar ball..."
+        wget -T 30 -t 5 --directory-prefix="$1" "$url"
+        if [[ $? -gt 0 ]] ; then echo "Failed to download kernel: $url" >&2; return 1; fi
+        echo "Done!"
+    else
+        echo "Kernel already downloaded to: $1/$file_name"
+    fi
+}
\ No newline at end of file