Script intended for environments without dotnet installer available, to easily and quickly install/update .NET SDK

get-dotnet.sh

#!/usr/bin/env sh
set -eu

# Main version for SDK and runtime
MAIN_VERSION="9.0"

# Installation directory
INSTALL_DIR="/usr/share/dotnet"

# If you need additional runtimes, specify their versions here separated by space, such as "9.0 8.0"
ADDITIONAL_VERSIONS=""

# If you require extra installer args you can specify them here
EXTRA_INSTALL_ARGS=""

if [ "$(id -u)" != 0 ]; then
        echo "ERROR: You need to execute this script as root!"
        exit 1
fi

if command -v dotnet > /dev/null; then
        echo "Checking old install..."
        dotnet --info
fi

case "$(uname -m)" in
        "aarch64")
                if [ "$(getconf LONG_BIT)" -lt 64 ]; then
                        # This is 32-bit OS running on 64-bit CPU
                        EXTRA_INSTALL_ARGS="${EXTRA_INSTALL_ARGS} --architecture arm"
                fi
                ;;
esac

echo "Downloading dotnet-install.sh..."

rm -f /tmp/dotnet-install.sh

if command -v curl > /dev/null; then
        curl -sL 'https://dot.net/v1/dotnet-install.sh' -o /tmp/dotnet-install.sh
elif command -v wget > /dev/null; then
        wget -q 'https://dot.net/v1/dotnet-install.sh' -O /tmp/dotnet-install.sh
else
        echo "ERROR: Install either curl or wget to download installer"
        exit 1
fi

chmod +x /tmp/dotnet-install.sh

echo "Installing dotnet..."

rm -rf /tmp/dotnet-new
/tmp/dotnet-install.sh -c "$MAIN_VERSION" -i /tmp/dotnet-new --no-path $EXTRA_INSTALL_ARGS

if [ -n "$ADDITIONAL_VERSIONS" ]; then
        for ADDITIONAL_VERSION in $ADDITIONAL_VERSIONS; do
                /tmp/dotnet-install.sh -c "$ADDITIONAL_VERSION" -i /tmp/dotnet-new --runtime aspnetcore --no-path $EXTRA_INSTALL_ARGS
        done
fi

rm -f /tmp/dotnet-install.sh

rm -rf /tmp/dotnet-old

if [ -d "$INSTALL_DIR" ]; then
        mv "$INSTALL_DIR" /tmp/dotnet-old
fi

mv /tmp/dotnet-new "$INSTALL_DIR"

if [ ! -L /usr/bin/dotnet ]; then
        ln -s "${INSTALL_DIR}/dotnet" /usr/bin/dotnet
fi

echo "Cleaning up..."

rm -rf /tmp/dotnet-old

"${INSTALL_DIR}/dotnet" --info
"${INSTALL_DIR}/dotnet" workload update

echo "All done!"