vscode-dev-containers/script-library/powershell-debian.sh

#!/usr/bin/env bash
#-------------------------------------------------------------------------------------------------------------
# Copyright (c) Microsoft Corporation. All rights reserved.
# Licensed under the MIT License. See https://go.microsoft.com/fwlink/?linkid=2090316 for license information.
#-------------------------------------------------------------------------------------------------------------
#
# Docs: https://github.com/microsoft/vscode-dev-containers/blob/master/script-library/docs/powershell.md
# Maintainer: The VS Code and Codespaces Teams
#
# Syntax: ./powershell-debian.sh

set -e

if [ "$(id -u)" -ne 0 ]; then
    echo -e 'Script must be run as root. Use sudo, su, or add "USER root" to your Dockerfile before running this script.'
    exit 1
fi

export DEBIAN_FRONTEND=noninteractive

# Install curl, apt-transport-https, lsb-release, or gpg if missing
if ! dpkg -s apt-transport-https curl ca-certificates lsb-release > /dev/null 2>&1 || ! type gpg > /dev/null 2>&1; then
    if [ ! -d "/var/lib/apt/lists" ] || [ "$(ls /var/lib/apt/lists/ | wc -l)" = "0" ]; then
        apt-get update
    fi
    apt-get -y install --no-install-recommends apt-transport-https curl ca-certificates lsb-release gnupg2 
fi

# Use correct source for distro (Ubuntu/Debian) and Codename (stretch, buster, bionic, focal)
DISTRO=$(lsb_release -is | tr '[:upper:]' '[:lower:]')
CODENAME=$(lsb_release -cs)
curl -s https://packages.microsoft.com/keys/microsoft.asc | (OUT=$(apt-key add - 2>&1) || echo $OUT)
echo "deb [arch=amd64] https://packages.microsoft.com/repos/microsoft-${DISTRO}-${CODENAME}-prod ${CODENAME} main" > /etc/apt/sources.list.d/microsoft.list
apt-get update -yq
apt-get install -yq powershell
echo "Done!"