ubuntu linux kernel autoupdater

kernel.sh

#!/usr/bin/env bash

if [[ $# -eq 0 ]]; then
    echo "Version not recieve" 2>&1
    echo "Example: $0 v3.11.2 l" 2>&1
    echo "Example: $0 v3.11.2" 2>&1
    exit 1
fi

if [[ $EUID -ne 0 ]]; then
    echo "You must be a root user" 2>&1
    exit 1
fi

if [[ $1 == 'l' ]]; then
    PWD=`dirname $0`
    version=`python3 $PWD/latest_kernel.py`
    if [[ "$version" == "" ]]; then
        echo 'Update is not required.'
        exit
    fi
    v__v=${version:1}
    echo "Latest version: $v__v"
    version_exist=`ls /boot | grep "vmlinuz-$v__v.0-" | wc -l`
    if [ $version_exist -ge 1 ]; then
      echo 'Kernel downloaded now'
      exit
    fi
    version_exist=`ls /boot | grep "vmlinuz-$v__v-" | wc -l`
    if [ $version_exist -ge 1 ]; then
      echo 'Kernel downloaded now'
      exit
    fi
else
    version=$1
fi

root_url='http://kernel.ubuntu.com/~kernel-ppa/mainline/'
install_dir="/tmp/_root_install_$$"

html=$(wget "$root_url$version/" -O- 2>/dev/null)

all=$(echo $html | sed -r 's/.*"(linux-headers[^"]+?_all\.deb)".*/\1/')
if [[ $2 = 'l' ]]; then
    headers=$(echo $html | sed -r 's/.*"(linux-headers[^"]+lowlatency[^"]+?\_amd64.deb)".*/\1/')
    image=$(echo $html | sed -r 's/.*"(linux-image[^"]+lowlatency[^"]+?\_amd64.deb)".*/\1/')
    modules=$(echo $html | sed -r 's/.*"(linux-modules[^"]+lowlatency[^"]+?\_amd64.deb)".*/\1/')
else
    headers=$(echo $html | sed -r 's/.*"(linux-headers[^"]+generic[^"]+?\_amd64.deb)".*/\1/')
    image=$(echo $html | sed -r 's/.*"(linux-image[^"]+generic[^"]+?\_amd64.deb)".*/\1/')
    modules=$(echo $html | sed -r 's/.*"(linux-modules[^"]+generic[^"]+?\_amd64.deb)".*/\1/')
fi

mkdir "$install_dir" ; cd "$install_dir"

echo "$modules"
echo "$root_url$version/$modules"

echo 'Please, wait...'
echo 'Downloading files.'
wget "$root_url$version/$headers" "$root_url$version/$modules" "$root_url$version/$image" "$root_url$version/$all" -t 0 -c 2>/dev/null &&

echo
ls -alF
sleep 15

echo 'Downloading done. Checksum check'

wget "$root_url$version/CHECKSUMS"

SUM_ALL=(`sha1sum "$all"`)
SUM_HEADERS=(`sha1sum "$headers"`)
SUM_IMAGE=(`sha1sum "$image"`)
SUM_MODULES=(`sha1sum "$modules"`)

ALL_OK=`cat CHECKSUMS | grep ${SUM_ALL[0]} | wc -l`
HEADERS_OK=`cat CHECKSUMS | grep ${SUM_HEADERS[0]} | wc -l`
IMAGE_OK=`cat CHECKSUMS | grep ${SUM_IMAGE[0]} | wc -l`
MODULES_OK=`cat CHECKSUMS | grep ${SUM_MODULES[0]} | wc -l`

if [ $ALL_OK -ge 1 ]; then
    echo '_all - checked' 2>&1
else
    echo '_all - error' 2>&1
    exit
fi

if [ $HEADERS_OK -ge 1 ]; then
    echo '_headers - checked' 2>&1
else
    echo '_headers - error' 2>&1
    exit
fi

if [ $IMAGE_OK -ge 1 ]; then
    echo '_image - checked' 2>&1
else
    echo '_image - error' 2>&1
    exit
fi

if [ $MODULES_OK -ge 1 ]; then
    echo '_modules - checked' 2>&1
else
    echo '_modules - error' 2>&1
    exit
fi

echo 'Done. Installing'

sleep 1

sudo dpkg -i "$all" "$headers" "$image" "$modules" && echo 'OK!' > /tmp/kernel || echo 'ERROR!' > /tmp/kernel

sleep 1

cd /tmp; rm -rf "$install_dir"

latest_kernel.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

import platform
from re import search
from requests import get
from sys import stderr

try:
    from lxml.html import document_fromstring
    import cssselect
except ImportError:
    print('Please, run: python -mpip install lxml cssselect', file=stderr)
    exit(1)

uri = 'http://kernel.ubuntu.com/~kernel-ppa/mainline/'

html = document_fromstring(get(uri).text)

versions = html.cssselect('tr > td[valign="top"] + td > a')
versions = [i.get('href') for i in versions]

_version = '0'

for i in versions:
    v = search('v(\\d+\\.\\d+(?:\\.\\d+)?)(.*)', i)
    if v and v.group(2).find('rc') == -1:
        v3 = v.group(1)
        if tuple(_version.split('.')) < tuple(v3.split('.')):
            _version = v3
release = platform.release().split('-')[0]
if _version != '0' and tuple(release.split('.')) < tuple(_version.split('.')):
    print('v%s' % _version)