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#!/bin/bash
set -o errexit
VERSION="$1"
ACK="${2:-0}"
MIN_VERSION=2
MAX_VERSION=6
LINUX_URL=https://cdn.kernel.org/pub/linux/kernel
ACK_URL=https://android.googlesource.com/kernel/common/+archive/refs/heads
if [ -z "$VERSION" ]; then
echo "usage: $0 VERSION [0 | 1]"
exit 1
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 --no-verbose --show-progress $LINUX_URL/v${first_char}.x/linux-$VERSION.tar.xz
tar -xf linux-$VERSION.tar.xz
else
echo "$first_char is not a valid kernel major version number"
exit 1
fi
else
wget $ACK_URL/$VERSION.tar.gz
mkdir -p $VERSION
tar -xf $VERSION.tar.gz -C $VERSION
fi