KMP Ubuntu

#!/bin/bash
# © Stefanescu Cristian 2014
# This bash script checks the last kernel version available from Ubuntu mainline PPA
# and downloads the debs so you can install them easier.
# It's a stupid description and I'll probably change it in the near future.


ARCH=`uname -m`; if [[ $ARCH == "x86_64" ]]; then ARCH="amd64"; else ARCH="i386"; fi
URL="http://kernel.ubuntu.com/~kernel-ppa/mainline"
TEMP="/tmp/mainline.html"
STRIP="/tmp/mainline.strip"
SORTED="/tmp/mainline.sort"
KVPAGE="/tmp/kver.html"

# download and save the mainpage to a temporary location
echo "Downloading URL"
wget "$URL" -O "$TEMP" > /dev/null 2>&1

# get rid of html tags, print the first column and sort it in reverse
sed 's/<[^>]\+>/ /g' -i "$TEMP"; awk '{print $1}' "$TEMP" > "$STRIP"; sort -rV "$STRIP" > "$SORTED"

# stable or rc?
# grep for rc if the user wants an rc version, exclude rc from searching if the user wants a stable version
# store the lines in an array, but no more then 10 kernel versions
# You can set the number of kernel versions in head -n10, but since we want the latest kernel, only 10 versions are fine
read -p "Do you want to install a stable version? [Y/n]
" kver
if [[ $kver == [Yy] || $kver == "" ]]; then
    ver_arr=( $(grep -v "rc" "$SORTED" | head -n10 | awk '{for (f = 1; f <= NF; f++) { a[NR, f] = $f } } NF > nf { nf = NF } END { for (f = 1; f <= nf; f++) { for (r = 1; r <= NR; r++) { printf a[r, f] (r==NR ? RS : FS) } } }') )
else
    ver_arr=( $(grep "rc" "$SORTED" | head -n10 | awk '{for (f = 1; f <= NF; f++) { a[NR, f] = $f } } NF > nf { nf = NF } END { for (f = 1; f <= nf; f++) { for (r = 1; r <= NR; r++) { printf a[r, f] (r==NR ? RS : FS) } } }') )
fi
# the following code depends on the previous answer, because we use the same array for each case (stable/rc)
# present the array in a friendly way so we can choose a number for a kernel version, if we don't want the latest kernel
echo "Select the version you want to install (Default is the latest, [0])"
for i in $(seq 0 $((${#ver_arr[@]} - 1))); do
    line="${ver_arr[$i]}"
    echo "[$i]. ${line}"
done

read -p "Enter the number correpsonding to the kernel version you want installed
" v
if [[ $v == "" ]]; then
    ver_id=$(echo ${ver_arr[0]} | awk '{ print $NF }')
else ver_id=$(echo ${ver_arr[$v]} | awk '{ print $NF }')
fi

# get the kernel's version page, so we can build the download links from the html
# save it as $KVPAGE
# grep through $KVPAGE for a generic or a lowlatency kernel
# grep for the headers
wget "$URL/$ver_id" -O "$KVPAGE" > /dev/null 2>&1

read -p "Do you want a lowlatency kernel? [N/y]
" latency
if [[ $latency == [Yy] ]]; then
    KERNEL=`grep -E "href.*image.*$ARCH.*latency.*deb" $KVPAGE | sed 's/<[^>]\+>/ /g' | awk '{print $1}'`
else KERNEL=`grep -E "href.*image.*$ARCH.*generic.*deb" $KVPAGE | sed 's/<[^>]\+>/ /g' | awk '{print $1}'`
fi

read -p "Download headers? [Y/n]
" headers
if [[ $headers == [Yy] || $headers == "" ]] && [[ $latency == [Yy] ]]; then
    HEADERS=`grep -E "href.*headers.*$ARCH.*latency.*deb" $KVPAGE | sed 's/<[^>]\+>/ /g' | awk '{print $1}'`
else HEADERS=`grep -E "href.*headers.*$ARCH.*generic.*deb" $KVPAGE | sed 's/<[^>]\+>/ /g' | awk '{print $1}'`
fi

echo "Downloading the files"
cd /tmp
wget -c "$URL"/"$ver_id"/"$KERNEL" --progress=bar:force 2>&1 | tail -f -n +6
if [[ $headers == [Yy] || $headers == "" ]]; then
    HEADERS_ALL=`grep -E "href.*headers.*all.*deb" $KVPAGE | sed 's/<[^>]\+>/ /g' | awk '{print $1}'`
    wget -c "$URL"/"$ver_id"/"$HEADERS" --progress=bar:force 2>&1 | tail -f -n +6
    wget -c "$URL"/"$ver_id"/"$HEADERS_ALL" --progress=bar:force 2>&1 | tail -f -n +6
fi

read -p "Install the mthrf0cker? [Y/n]
" install
if [[ $install == [Yy] || $install == "" ]]; then
    sudo dpkg -i $KERNEL
    if [[ $headers == [Yy] || $headers == "" ]]; then
        sudo dpkg -i $HEADERS_ALL $HEADERS
    fi
fi

read -p "Delete the *.deb files? [Y/n]
" deb
if [[ $deb == [Yy] || $deb == "" ]]; then
    rm -v $KERNEL
    if [[ -e $HEADERS ]]; then
        rm -v $HEADERS_ALL $HEADERS
    fi
fi

#cleanup
rm $TEMP $STRIP $SORTED $KVPAGE
unset ver_arr