Use dotnet-install.sh in .NET feature (#628)

* Use dotnet-install.sh in .NET feature

* Use latest.version files

* Cleanup runtime args

* Use latest.version files in tests as well

* Improve tests, remove code duplication

* Add stderr helper

* Validate version inputs

* Use suggested description
Co-authored-by: Samruddhi Khandale <samruddhikhandale@github.com>

* Shorter version description
Co-authored-by: Samruddhi Khandale <samruddhikhandale@github.com>

* Shorter version description
Co-authored-by: Samruddhi Khandale <samruddhikhandale@github.com>

* Clean up apt lists

* Verify 7.0 is latest

* Fix PATH, add test for .NET global tools

* Include a copy of dotnet-install.sh in the Feature

* Configure useful env variables

* Use stringly typed booleans

* Keep imperative writing style in option hints

* Update maintainers
Co-authored-by: Samruddhi Khandale <samruddhikhandale@github.com>

* Move dotnet-install.sh into a vendor directory

* Refactor variables

* Amend

* Amend 2

* Use default options from devcontainer-feature.json

* Add back variables

* Fix shellchek warning in fetch_latest_sdk_version

* Inline install_version function

* Fix ShellCheck warnings

* Improve CSV parsing

* Default to latest when configuring an empty version

* Add support for runtime-only configurations

* Move 'none' check higher up

* Deduplicate helper functions, sort into files

* Address the user more directly in NOTES

* Remove unnecessary defaults

* Replace feature -> Feature
Co-authored-by: Samruddhi Khandale <samruddhikhandale@github.com>

* Add update-dotnet-install-script workflow

* Apply suggestions from code review
Co-authored-by: Samruddhi Khandale <samruddhikhandale@github.com>

* Don't skip ci for automated script update

---------
Co-authored-by: Samruddhi Khandale <samruddhikhandale@github.com>

.github/workflows/update-dotnet-install-script.yml

+name: "Updates vendor 'dotnet-install' script"
+on:
+  workflow_dispatch:
+  schedule:
+  - cron: '0 0 * * 0'  # Runs every Sunday at midnight UTC (adjust as needed)
+
+jobs:
+  fetch-latest-dotnet-install:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Run fetch-latest-dotnet-install.sh
+        run: src/dotnet/scripts/fetch-latest-dotnet-install.sh
+
+      - name: Create a PR for dotnet-install.sh
+        id: push_image_info
+        env:
+          GITHUB_TOKEN: ${{ secrets.PAT }}
+        run: |
+          set -e
+          echo "Start."
+
+          # Configure git and Push updates
+          git config --global user.email github-actions@github.com
+          git config --global user.name github-actions
+          git config pull.rebase false
+
+          branch=automated-script-update-$GITHUB_RUN_ID
+          git checkout -b $branch
+          message='[Updates] Automated vendor 'dotnet-install' script'
+
+          # Add / update and commit
+          git add src/dotnet/scripts/vendor/dotnet-install.sh
+          git commit -m 'Automated dotnet-install script update' || export NO_UPDATES=true
+
+          # Push
+          if [ "$NO_UPDATES" != "true" ] ; then
+              git push origin "$branch"
+              gh api \
+                --method POST \
+                -H "Accept: application/vnd.github+json" \
+                /repos/${GITHUB_REPOSITORY}/pulls \
+                -f title="$message" \
+              -f body="$message" \
+              -f head="$branch" \
+              -f base="$GITHUB_REF_NAME"
+          fi

src/dotnet/NOTES.md

+## Configuration examples
 
+Installing only the latest .NET SDK version (the default).
+
+``` json
+{
+"features": {
+    "ghcr.io/devcontainers/features/dotnet:2": "latest" // or "" or {}
+}
+```
+
+Installing an additional SDK version. Multiple versions can be specified as comma-separated values.
+
+``` json
+{
+"features": {
+    "ghcr.io/devcontainers/features/dotnet:2": {
+        "additionalVersions": "lts"
+    }
+}
+```
+
+Installing specific SDK versions.
+
+``` json
+{
+"features": {
+    "ghcr.io/devcontainers/features/dotnet:2": {
+        "version": "6.0",
+        "additionalVersions": "7.0, 8.0"
+    }
+}
+```
+
+Installing a specific SDK feature band.
+
+``` json
+{
+"features": {
+    "ghcr.io/devcontainers/features/dotnet:2": {
+        "version": "6.0.4xx",
+    }
+}
+```
+
+Installing a specific SDK patch version.
+
+``` json
+{
+"features": {
+    "ghcr.io/devcontainers/features/dotnet:2": {
+        "version": "6.0.412",
+    }
+}
+```
+
+Installing only the .NET Runtime or the ASP.NET Core Runtime. (The SDK includes all runtimes so this configuration is only useful if you need to run .NET apps without building them from source.)
+
+``` json
+{
+"features": {
+    "ghcr.io/devcontainers/features/dotnet:2": {
+        "version": "none",
+        "dotnetRuntimeVersions": "latest, lts",
+        "aspnetCoreRuntimeVersions": "latest, lts",
+    }
+}
+```
 
 ## OS Support
 

src/dotnet/devcontainer-feature.json

 {
     "id": "dotnet",
-    "version": "1.1.4",
+    "version": "2.0.0",
     "name": "Dotnet CLI",
     "documentationURL": "https://github.com/devcontainers/features/tree/main/src/dotnet",
-    "description": "Installs the .NET CLI. Provides option of installing sdk or runtime, and option of versions to install. Uses latest version of .NET sdk as defaults to install.",
+    "description": "This Feature installs the latest .NET SDK, which includes the .NET CLI and the shared runtime. Options are provided to choose a different version or additional versions.",
     "options": {
         "version": {
             "type": "string",
             "proposals": [
                 "latest",
-                "7",
-                "6",
-                "3.1"
+                "lts",
+                "none",
+                "8.0",
+                "7.0",
+                "6.0"
             ],
             "default": "latest",
-            "description": "Select or enter a dotnet CLI version. (Available versions may vary by Linux distribution.)"
+            "description": "Select or enter a .NET SDK version. Use 'latest' for the latest version, 'lts' for the latest LTS version, 'X.Y' or 'X.Y.Z' for a specific version."
         },
-        "runtimeOnly": {
-            "type": "boolean",
-            "default": false,
-            "description": "Install just the dotnet runtime if true, and sdk if false."
+        "additionalVersions": {
+            "type": "string",
+            "default": "",
+            "description": "Enter additional .NET SDK versions, separated by commas. Use 'latest' for the latest version, 'lts' for the latest LTS version, 'X.Y' or 'X.Y.Z' for a specific version."
+        },
+        "dotnetRuntimeVersions": {
+            "type": "string",
+            "default": "",
+            "description": "Enter additional .NET runtime versions, separated by commas. Use 'latest' for the latest version, 'lts' for the latest LTS version, 'X.Y' or 'X.Y.Z' for a specific version."
         },
-        "installUsingApt": {
-            "type": "boolean",
-            "default": true,
-            "description": "If true, it installs using apt instead of the release URL"
+        "aspNetCoreRuntimeVersions": {
+            "type": "string",
+            "default": "",
+            "description": "Enter additional ASP.NET Core runtime versions, separated by commas. Use 'latest' for the latest version, 'lts' for the latest LTS version, 'X.Y' or 'X.Y.Z' for a specific version."
         }
     },
     "containerEnv": {
-        "DOTNET_ROOT": "/usr/local/dotnet/current",
-        "PATH": "/usr/local/dotnet/current:${PATH}"
+        "DOTNET_ROOT": "/usr/share/dotnet",
+        "PATH": "$PATH:$DOTNET_ROOT:~/.dotnet/tools",
+        "DOTNET_RUNNING_IN_CONTAINER": "true",
+        "DOTNET_USE_POLLING_FILE_WATCHER": "true"
     },
     "customizations": {
         "vscode": {

src/dotnet/install.sh

@@ -4,46 +4,20 @@
 # 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/main/script-library/docs/dotnet.md
-# Maintainer: The VS Code and Codespaces Teams
-
+# Docs: https://github.com/devcontainers/features/tree/main/src/dotnet
+# Maintainer: The Dev Container spec maintainers
 DOTNET_VERSION="${VERSION:-"latest"}"
-DOTNET_RUNTIME_ONLY="${RUNTIMEONLY:-"false"}"
-OVERRIDE_DEFAULT_VERSION="${OVERRIDEDEFAULTVERSION:-"true"}"
-INSTALL_USING_APT="${INSTALLUSINGAPT:-"true"}"
-
-DOTNET_LATEST="7"
-DOTNET_LTS="6"
-
-USERNAME="${USERNAME:-"${_REMOTE_USER:-"automatic"}"}"
-UPDATE_RC="${UPDATE_RC:-"true"}"
-TARGET_DOTNET_ROOT="${TARGET_DOTNET_ROOT:-"/usr/local/dotnet"}"
-ACCESS_GROUP="${ACCESS_GROUP:-"dotnet"}"
-
-MICROSOFT_GPG_KEYS_URI="https://packages.microsoft.com/keys/microsoft.asc"
-DOTNET_ARCHIVE_ARCHITECTURES="amd64"
-DOTNET_ARCHIVE_VERSION_CODENAMES="buster bullseye bionic focal hirsute jammy"
-# Feed URI sourced from the official dotnet-install.sh
-# https://github.com/dotnet/install-scripts/blob/1b98b94a6f6d81cc4845eb88e0195fac67caa0a6/src/dotnet-install.sh#L1342-L1343
-DOTNET_CDN_FEED_URI="https://dotnetcli.azureedge.net"
-# Ubuntu 22.04 and on do not ship with libssl1.1, which is required for versions of .NET < 6.0
-DOTNET_VERSION_CODENAMES_REQUIRE_OLDER_LIBSSL_1="buster bullseye bionic focal hirsute"
+ADDITIONAL_VERSIONS="${ADDITIONALVERSIONS}"
+DOTNET_RUNTIME_VERSIONS="${DOTNETRUNTIMEVERSIONS}"
+ASPNETCORE_RUNTIME_VERSIONS="${ASPNETCORERUNTIMEVERSIONS}"
 
-# Comma-separated list of dotnet versions to be installed
-# alongside DOTNET_VERSION, but not set as default.
-ADDITIONAL_VERSIONS=${ADDITIONALVERSIONS:-""}
-
-APT_PREFERENCES_CONTENT="$(cat << 'EOF'
-Package: *
-Pin: origin "packages.microsoft.com"
-Pin-Priority: 1001
-EOF
-)"
+set -e
 
-APT_PREFERENCES_FILE_ADDED="false"
-APT_PREFERENCES_UPDATED="false"
+# Import trim_whitespace and split_csv
+source "scripts/string-helpers.sh"
 
-set -e
+# Import install_sdk and install_runtime
+source "scripts/dotnet-helpers.sh"
 
 # Clean up
 rm -rf /var/lib/apt/lists/*
@@ -53,72 +27,14 @@ err() {
     echo "(!) $*" >&2
 }
 
-# Ensure the appropriate root user is running the script.
-if [ "$(id -u)" -ne 0 ]; then
-    err 'Script must be run as root. Use sudo, su, or add "USER root" to your Dockerfile before running this script.'
-    exit 1
-fi
-
-# Ensure that login shells get the correct path if the user updated the PATH using ENV.
-rm -f /etc/profile.d/00-restore-env.sh
-echo "export PATH=${PATH//$(sh -lc 'echo $PATH')/\$PATH}" > /etc/profile.d/00-restore-env.sh
-chmod +x /etc/profile.d/00-restore-env.sh
-
-# Determine the appropriate non-root user.
-if [ "${USERNAME}" = "auto" ] || [ "${USERNAME}" = "automatic" ]; then
-    USERNAME=""
-    POSSIBLE_USERS=("vscode" "node" "codespace" "$(awk -v val=1000 -F ":" '$3==val{print $1}' /etc/passwd)")
-    for CURRENT_USER in "${POSSIBLE_USERS[@]}"; do
-        if id -u "${CURRENT_USER}" > /dev/null 2>&1; then
-            USERNAME="${CURRENT_USER}"
-            break
-        fi
-    done
-    if [ "${USERNAME}" = "" ]; then
-        USERNAME=root
-    fi
-elif [ "${USERNAME}" = "none" ] || ! id -u ${USERNAME} > /dev/null 2>&1; then
-    USERNAME=root
-fi
-
-###################
-# Helper Functions
-###################
-
-# Cleanup temporary directory and associated files when exiting the script.
-cleanup() {
-    EXIT_CODE=$?
-    set +e
-    if [[ -n "${TMP_DIR}" ]]; then
-        echo "Executing cleanup of tmp files"
-        rm -Rf "${TMP_DIR}"
-    fi
-    exit $EXIT_CODE
-}
-trap cleanup EXIT
-
-# Add dotnet directory to PATH in bashrc/zshrc files if OVERRIDE_DEFAULT_VERSION=true.
-updaterc() {
-    if [ "${UPDATE_RC}" = "true" ]; then
-        echo "Updating /etc/bash.bashrc and /etc/zsh/zshrc..."
-        if [[ "$(cat /etc/bash.bashrc)" != *"$1"* ]]; then
-            echo -e "$1" >> /etc/bash.bashrc
-        fi
-        if [ -f "/etc/zsh/zshrc" ] && [[ "$(cat /etc/zsh/zshrc)" != *"$1"* ]]; then
-            echo -e "$1" >> /etc/zsh/zshrc
-        fi
-    fi
-}
-
-apt_get_update()
-{
+apt_get_update() {
     if [ "$(find /var/lib/apt/lists/* | wc -l)" = "0" ]; then
         echo "Running apt-get update..."
         apt-get update -y
     fi
 }
 
-# Check if packages are installed and installs them if not.
+# Checks if packages are installed and installs them if not
 check_packages() {
     if ! dpkg -s "$@" > /dev/null 2>&1; then
         apt_get_update
@@ -126,367 +42,77 @@ check_packages() {
     fi
 }
 
-# Get appropriate architecture name for .NET binaries for the target OS
-get_architecture_name_for_target_os() {
-    local architecture
-    architecture="$(uname -m)"
-    case $architecture in
-        x86_64) architecture="x64";;
-        aarch64 | armv8*) architecture="arm64";;
-        *) err "Architecture ${architecture} unsupported"; exit 1 ;;
-    esac
-
-    echo "${architecture}"
-}
-
-# Soft version matching that resolves a version for a given package in the *current apt-cache*
-# Return value is stored in first argument (the unprocessed version)
-apt_cache_package_and_version_soft_match() {
-    # Version
-    local version_variable_name="$1"
-    local requested_version=${!version_variable_name}
-    # Package Name
-    local package_variable_name="$2"
-    local partial_package_name=${!package_variable_name}
-    local package_name
-    # Exit on no match?
-    local exit_on_no_match="${3:-true}"
-    local major_minor_version
-
-    # Ensure we've exported useful variables
-    . /etc/os-release
-    local architecture="$(dpkg --print-architecture)"
-
-    apt-get update -y
-    major_minor_version="$(echo "${requested_version}" | cut -d "." --field=1,2)"
-    package_name="$(apt-cache search "${partial_package_name}-[0-9].[0-9]$" | awk -F" - " '{print $1}' | grep -m 1 "${partial_package_name}-${major_minor_version}")"
-    dot_escaped="${requested_version//./\\.}"
-    dot_plus_escaped="${dot_escaped//+/\\+}"
-    # Regex needs to handle debian package version number format: https://www.systutorials.com/docs/linux/man/5-deb-version/
-    version_regex="^(.+:)?${dot_plus_escaped}([\\.\\+ ~:-]|$)"
-    set +e # Don't exit if finding version fails - handle gracefully
-        fuzzy_version="$(apt-cache madison ${package_name} | awk -F"|" '{print $2}' | sed -e 's/^[ \t]*//' | grep -E -m 1 "${version_regex}")"
-    set -e
-    if [ -z "${fuzzy_version}" ]; then
-        echo "(!) No full or partial for package \"${partial_package_name}\" (resolved: \"${package_name}\") match found in apt-cache for \"${requested_version}\" on OS ${ID} ${VERSION_CODENAME} (${architecture})."
-
-        if $exit_on_no_match; then
-            echo "Available versions:"
-            apt-cache madison ${package_name} | awk -F"|" '{print $2}' | grep -oP '^(.+:)?\K.+'
-            exit 1 # Fail entire script
-        else
-            echo "Continuing to fallback method if available"
-            return 1;
-        fi
-    fi
-
-    # Globally assign fuzzy_version to this value
-    # Use this value as the return value of this function
-    declare -g ${version_variable_name}="=${fuzzy_version}"
-    echo "${version_variable_name} ${!version_variable_name}"
-
-    # Globally assign package to this value
-    # Use this value as the return value of this function
-    declare -g ${package_variable_name}="${package_name}"
-    echo "${package_variable_name} ${!package_variable_name}"
-}
-
-# Install .NET CLI using apt-get package installer
-install_using_apt() {
-    local sdk_or_runtime="$1"
-    local target_dotnet_version="$2"
-    local use_msft_repo="$3"
-
-    if [ "${use_msft_repo}" = "true" ]; then
-        # Install dependencies
-        check_packages apt-transport-https curl ca-certificates gnupg2 dirmngr
-        # Import key safely and import Microsoft apt repo
-        curl -sSL ${MICROSOFT_GPG_KEYS_URI} | gpg --dearmor > /usr/share/keyrings/microsoft-archive-keyring.gpg
-        echo "deb [arch=${architecture} signed-by=/usr/share/keyrings/microsoft-archive-keyring.gpg] https://packages.microsoft.com/repos/microsoft-${ID}-${VERSION_CODENAME}-prod ${VERSION_CODENAME} main" > /etc/apt/sources.list.d/microsoft.list
-
-        [ ! -f /etc/apt/preferences ] && APT_PREFERENCES_FILE_ADDED="true"
-        APT_PREFERENCES_UPDATED="true"
-
-        # See https://github.com/dotnet/core/issues/7699
-        echo "${APT_PREFERENCES_CONTENT}" >> /etc/apt/preferences
-        apt-get update -y
-    fi
-
-    # .NET 7 is not a LTS version, so handle latest and LTS versions differently
-    export APT_DOTNET_VERSION="$target_dotnet_version"
-    if [ "${APT_DOTNET_VERSION}" = "latest" ]; then 
-        APT_DOTNET_VERSION="${DOTNET_LATEST}.0"
-    elif [ "${APT_DOTNET_VERSION}" = "lts" ]; then
-        APT_DOTNET_VERSION="${DOTNET_LTS}.0"
-    fi
-
-    # Sets target_dotnet_version and dotnet_package if matches found.
-    local base_dotnet_package="dotnet-${sdk_or_runtime}"
-    export DOTNET_PACKAGE="${base_dotnet_package}"
-    apt_cache_package_and_version_soft_match APT_DOTNET_VERSION DOTNET_PACKAGE false
-    if [ "$?" != 0 ] || [ ${DOTNET_PACKAGE} == "${base_dotnet_package}" ]; then
-        echo "Failed to find requested version."
-        return 1
-    fi
-
-    if type dotnet > /dev/null 2>&1 && [[ "$(dotnet --version)" == *"${APT_DOTNET_VERSION}"* ]] ; then
-        echo "dotnet version ${APT_DOTNET_VERSION} is already installed"
-        return 1
-    fi
-
-    echo "Installing '${DOTNET_PACKAGE}${APT_DOTNET_VERSION}'..."
-    apt-get install -yq ${DOTNET_PACKAGE}${APT_DOTNET_VERSION}
-    if [ "$?" != 0 ]; then
-        echo "Failed to complete apt install of ${DOTNET_PACKAGE}${TARGET_DOTNET_VERSION}"
-        return 1
-    fi
-
-    # Add symlink for current
-    CURRENT_DIR="${TARGET_DOTNET_ROOT}/current"
-    if [[ -d "${CURRENT_DIR}" ]]; then
-        rm -rf "${CURRENT_DIR}"
-    fi
-    mkdir -p "${TARGET_DOTNET_ROOT}"
-    local dotnet_installed_version="$(dotnet --version)"
-    # See if its the distro version
-    if [[ "$(dotnet --info)" == *"Base Path:   /usr/lib/dotnet/${DOTNET_SDK_OR_RUNTIME}/${dotnet_installed_version}"* ]]; then
-        ln -s "/usr/lib/dotnet" "${CURRENT_DIR}"
-    else
-        # Location used by MS repo versions
-        ln -s "/usr/share/dotnet" "${CURRENT_DIR}" 
-    fi
-}
-
-# Find and extract .NET binary download details based on user-requested version
-# args:
-# sdk_or_runtime $1
-# dotnet_version_to_download $2
-# exports:
-# DOTNET_DOWNLOAD_URL
-# DOTNET_DOWNLOAD_HASH
-# DOTNET_DOWNLOAD_NAME
-get_full_version_details() {
-    local sdk_or_runtime="$1"
-    local architecture
-    local dotnet_channel_version
-    local dotnet_releases_url
-    local dotnet_releases_json
-    local dotnet_latest_version
-    local dotnet_download_details
-
-    export DOTNET_DOWNLOAD_VERSION="$2"
-    export DOTNET_DOWNLOAD_URL
-    export DOTNET_DOWNLOAD_HASH
-    export DOTNET_DOWNLOAD_NAME
-
-    # Set architecture variable to current user's architecture (x64 or ARM64).
-    architecture="$(get_architecture_name_for_target_os)"
-
-    # Set VERSION to empty string to ensure jq includes all .NET versions in reverse sort below 
-    if [ "${DOTNET_DOWNLOAD_VERSION}" = "latest" ]; then
-        DOTNET_DOWNLOAD_VERSION=""
-    fi
-
-    dotnet_patchless_version="$(echo "${DOTNET_DOWNLOAD_VERSION}" | cut -d "." --field=1,2)"
-
-    set +e
-    dotnet_channel_version="$(curl -s "${DOTNET_CDN_FEED_URI}/dotnet/release-metadata/releases-index.json" | jq -r --arg channel_version "${dotnet_patchless_version}" '[."releases-index"[]] | sort_by(."channel-version") | reverse | map( select(."channel-version" | startswith($channel_version))) | first | ."channel-version"')"
-    set -e
+if [ "$(id -u)" -ne 0 ]; then
+    err 'Script must be run as root. Use sudo, su, or add "USER root" to your Dockerfile before running this script.'
+    exit 1
+fi
 
-    # Construct the releases URL using the official channel-version if one was found.  Otherwise make a best-effort using the user input.
-    if [ -n "${dotnet_channel_version}" ] && [ "${dotnet_channel_version}" != "null" ]; then
-        dotnet_releases_url="${DOTNET_CDN_FEED_URI}/dotnet/release-metadata/${dotnet_channel_version}/releases.json"
-    else
-        dotnet_releases_url="${DOTNET_CDN_FEED_URI}/dotnet/release-metadata/${dotnet_patchless_version}/releases.json"
-    fi
+# For our own convenience, combine DOTNET_VERSION and ADDITIONAL_VERSIONS into a single 'versions' array
+versions=()
 
-    set +e
-    dotnet_releases_json="$(curl -s "${dotnet_releases_url}")"
-    set -e
-    
-    if [ -n "${dotnet_releases_json}" ] && [[ ! "${dotnet_releases_json}" = *"Error"* ]]; then
-        dotnet_latest_version="$(echo "${dotnet_releases_json}" | jq -r --arg sdk_or_runtime "${sdk_or_runtime}" '."latest-\($sdk_or_runtime)"')"
-        # If user-specified version has 2 or more dots, use it as is.  Otherwise use latest version.
-        if [ "$(echo "${DOTNET_DOWNLOAD_VERSION}" | grep -o "\." | wc -l)" -lt "2" ]; then
-            DOTNET_DOWNLOAD_VERSION="${dotnet_latest_version}"
-        fi
+# The version can be set to 'none' for runtime-only installations, then the array will just remain empty
+# Ensure there are no leading or trailing spaces that can break regex pattern matching
+if [ "$DOTNET_VERSION" != "none" ]; then
+    versions+=("$(trim_whitespace "$DOTNET_VERSION")")
+    for additional_version in $(split_csv "$ADDITIONAL_VERSIONS"); do
+        versions+=("$additional_version")
+    done
+fi
 
-        dotnet_download_details="$(echo "${dotnet_releases_json}" |  jq -r --arg sdk_or_runtime "${sdk_or_runtime}" --arg dotnet_version "${DOTNET_DOWNLOAD_VERSION}" --arg arch "${architecture}" '.releases[]."\($sdk_or_runtime)" | select(.version==$dotnet_version) | .files[] | select(.name=="dotnet-\($sdk_or_runtime)-linux-\($arch).tar.gz")')"
-        if [ -n "${dotnet_download_details}" ]; then
-            echo "Found .NET binary version ${DOTNET_DOWNLOAD_VERSION}"
-            DOTNET_DOWNLOAD_URL="$(echo "${dotnet_download_details}" | jq -r '.url')"
-            DOTNET_DOWNLOAD_HASH="$(echo "${dotnet_download_details}" | jq -r '.hash')"
-            DOTNET_DOWNLOAD_NAME="$(echo "${dotnet_download_details}" | jq -r '.name')"
-        else
-            err "Unable to find .NET binary for version ${DOTNET_DOWNLOAD_VERSION}"
-            exit 1
-        fi
-    else
-        err "Unable to find .NET release details for version ${DOTNET_DOWNLOAD_VERSION} at ${dotnet_releases_url}"
+dotnetRuntimeVersions=()
+for dotnetRuntimeVersion in $(split_csv "$DOTNET_RUNTIME_VERSIONS"); do
+    dotnetRuntimeVersions+=("$dotnetRuntimeVersion")
+done
+
+aspNetCoreRuntimeVersions=()
+for aspNetCoreRuntimeVersion in $(split_csv "$ASPNETCORE_RUNTIME_VERSIONS"); do
+    aspNetCoreRuntimeVersions+=("$aspNetCoreRuntimeVersion")
+done
+
+# Fail fast in case of bad input to avoid unneccesary work
+# v1 of the .NET feature allowed specifying only a major version 'X' like '3'
+# v2 removed this ability
+# - because install-dotnet.sh does not support it directly
+# - because the previous behavior installed an old version like '3.0.103', not the newest version '3.1.426', which was counterintuitive
+for version in "${versions[@]}"; do
+    if [[ "$version" =~ ^[0-9]+$ ]]; then
+        err "Unsupported .NET SDK version '${version}'. Use 'latest' for the latest version, 'lts' for the latest LTS version, 'X.Y' or 'X.Y.Z' for a specific version."
         exit 1
     fi
-}
-
-# Install .NET CLI using the .NET releases url
-install_using_dotnet_releases_url() {
-    local sdk_or_runtime="$1"
-    local version="$2"
-
-    # Check listed package dependencies and install them if they are not already installed. 
-    # NOTE: icu-devtools is a small package with similar dependencies to .NET. 
-    #       It will install the appropriate dependencies based on the OS:
-    #         - libgcc-s1 OR libgcc1 depending on OS
-    #         - the latest libicuXX depending on OS (eg libicu57 for stretch)
-    #         - also installs libc6 and libstdc++6 which are required by .NET 
-    check_packages curl ca-certificates tar jq icu-devtools libgssapi-krb5-2 zlib1g
-
-    # Starting with Ubuntu 22.04 (jammy), libssl1.1 does not ship with the OS anymore.
-    if [[  "${DOTNET_VERSION_CODENAMES_REQUIRE_OLDER_LIBSSL_1}" = *"${VERSION_CODENAME}"* ]]; then
-        check_packages libssl1.1
-    else
-        check_packages libssl3
-    fi
+done
 
-    get_full_version_details "${sdk_or_runtime}" "${version}"
-
-    DOTNET_INSTALL_PATH="${TARGET_DOTNET_ROOT}/${DOTNET_DOWNLOAD_VERSION}"
-    if [ -d "${DOTNET_INSTALL_PATH}" ]; then
-        echo "(!) Dotnet version ${DOTNET_DOWNLOAD_VERSION} already exists."
+for version in "${dotnetRuntimeVersions[@]}"; do
+    if [[ "$version" =~ ^[0-9]+$ ]]; then
+        err "Unsupported .NET Runtime version '${version}'. Use 'latest' for the latest version, 'lts' for the latest LTS version, 'X.Y' or 'X.Y.Z' for a specific version."
         exit 1
     fi
-    # exports DOTNET_DOWNLOAD_URL, DOTNET_DOWNLOAD_HASH, DOTNET_DOWNLOAD_NAME
-    echo "DOWNLOAD LINK: ${DOTNET_DOWNLOAD_URL}"
-
-    # Setup the access group and add the user to it.
-    umask 0002
-    if ! cat /etc/group | grep -e "^${ACCESS_GROUP}:" > /dev/null 2>&1; then
-        groupadd -r "${ACCESS_GROUP}"
-    fi
-    usermod -a -G "${ACCESS_GROUP}" "${USERNAME}"
-
-    # Download the .NET binaries.
-    echo "DOWNLOADING BINARY..."
-    TMP_DIR="/tmp/dotnetinstall"
-    mkdir -p "${TMP_DIR}"
-    curl -sSL "${DOTNET_DOWNLOAD_URL}" -o "${TMP_DIR}/${DOTNET_DOWNLOAD_NAME}"
-
-    # Get checksum from .NET CLI blob storage using the runtime version and
-    # run validation (sha512sum) of checksum against the expected checksum hash.
-    echo "VERIFY CHECKSUM"
-    cd "${TMP_DIR}"
-    echo "${DOTNET_DOWNLOAD_HASH} *${DOTNET_DOWNLOAD_NAME}" | sha512sum -c -
-
-    # Extract binaries and add to path.
-    mkdir -p "${DOTNET_INSTALL_PATH}"
-    echo "Extract Binary to ${DOTNET_INSTALL_PATH}"
-    tar -xzf "${TMP_DIR}/${DOTNET_DOWNLOAD_NAME}" -C "${DOTNET_INSTALL_PATH}" --strip-components=1
+done
 
-    CURRENT_DIR="${TARGET_DOTNET_ROOT}/current"
-    if [[ ! -d "${CURRENT_DIR}" ]]; then
-        ln -s "${DOTNET_INSTALL_PATH}" "${CURRENT_DIR}" 
-    fi
-
-    # Give write permissions to the user.
-    chown -R "${USERNAME}:${USERNAME}" "${CURRENT_DIR}"
-    chmod g+r+w+s "${CURRENT_DIR}"
-    chmod -R g+r+w "${CURRENT_DIR}"
-
-    if [[ "${OVERRIDE_DEFAULT_VERSION}" = "true" ]]; then
-        if [[ $(ls -l ${CURRENT_DIR}) != *"-> ${DOTNET_INSTALL_PATH}"* ]] ; then
-            rm "${CURRENT_DIR}"
-            ln -s "${DOTNET_INSTALL_PATH}" "${CURRENT_DIR}"
-        fi
-    fi
-    
-    updaterc "if [[ \"\${PATH}\" != *\"${CURRENT_DIR}\"* ]]; then export PATH=${CURRENT_DIR}:\${PATH}; fi"
-}
-
-###########################
-# Start .NET installation
-###########################
-
-export DEBIAN_FRONTEND=noninteractive
-
-. /etc/os-release
-architecture="$(dpkg --print-architecture)"
-
-# Dotnet 3.1 and 5 are not supported on Ubuntu 22.04 (jammy)+,
-# due to lack of libssl3.0 support.
-# See: https://github.com/microsoft/vscode-dev-containers/issues/1458#issuecomment-1135077775
-# NOTE: This will only guard against installation of the dotnet versions we propose via 'features'. 
-#       The user can attempt to install any other version at their own risk.
-if [[ "${DOTNET_VERSION}" = "3"* ]] || [[ "${DOTNET_VERSION}" = "5"* ]]; then
-    if [[ ! "${DOTNET_VERSION_CODENAMES_REQUIRE_OLDER_LIBSSL_1}" = *"${VERSION_CODENAME}"* ]]; then
-        err "Dotnet ${DOTNET_VERSION} is not supported on Ubuntu ${VERSION_CODENAME} due to a change in the 'libssl' dependency across distributions.\n Please upgrade your version of dotnet, or downgrade your OS version."
+for version in "${aspNetCoreRuntimeVersions[@]}"; do
+    if [[ "$version" =~ ^[0-9]+$ ]]; then
+        err "Unsupported ASP.NET Core Runtime version '${version}'. Use 'latest' for the latest version, 'lts' for the latest LTS version, 'X.Y' or 'X.Y.Z' for a specific version."
         exit 1
     fi
-fi
+done
 
-# Determine if the user wants to download .NET Runtime only, or .NET SDK & Runtime
-# and set the appropriate variables.
-if [ "${DOTNET_RUNTIME_ONLY}" = "true" ]; then
-    DOTNET_SDK_OR_RUNTIME="runtime"
-elif [ "${DOTNET_RUNTIME_ONLY}" = "false" ]; then
-    DOTNET_SDK_OR_RUNTIME="sdk"
-else
-    err "Expected true for installing dotnet Runtime only or false for installing SDK and Runtime. Received ${DOTNET_RUNTIME_ONLY}."
-    exit 1
-fi
+# Install .NET versions and dependencies
+# icu-devtools includes dependencies for .NET
+check_packages wget ca-certificates icu-devtools
 
-# Install the .NET CLI
-echo "(*) Installing .NET CLI..."
+for version in "${versions[@]}"; do
+    install_sdk "$version"
+done
 
-CHANGE_OWNERSHIP="false"
-if [[ "${DOTNET_ARCHIVE_ARCHITECTURES}" = *"${architecture}"* ]] && [[  "${DOTNET_ARCHIVE_VERSION_CODENAMES}" = *"${VERSION_CODENAME}"* ]] && [[ "${INSTALL_USING_APT}" = "true" ]]; then
-    echo "Detected ${VERSION_CODENAME} on ${architecture}. Attempting to install dotnet from apt"
+for version in "${dotnetRuntimeVersions[@]}"; do
+    install_runtime "dotnet" "$version"
+done
 
-    install_using_apt "${DOTNET_SDK_OR_RUNTIME}" "${DOTNET_VERSION}" false || install_using_apt "${DOTNET_SDK_OR_RUNTIME}" "${DOTNET_VERSION}" true
-    if [ "$?" != 0 ]; then
-        echo "Could not install requested version from apt on current distribution."
-        exit 1
-    fi
-else
-    if [[ "${INSTALL_USING_APT}" = "false" ]]; then
-        echo "Installing dotnet from releases url"
-    else
-        echo "Attempting to install dotnet from releases url"
-    fi
-    install_using_dotnet_releases_url "${DOTNET_SDK_OR_RUNTIME}" "${DOTNET_VERSION}"
-    CHANGE_OWNERSHIP="true"
-fi
-
-# Additional dotnet versions to be installed but not be set as default.
-if [ ! -z "${ADDITIONAL_VERSIONS}" ]; then
-    OLDIFS=$IFS
-    IFS=","
-        read -a additional_versions <<< "$ADDITIONAL_VERSIONS"
-        for version in "${additional_versions[@]}"; do
-            OVERRIDE_DEFAULT_VERSION="false"
-            install_using_dotnet_releases_url "${DOTNET_SDK_OR_RUNTIME}" "${version}"
-        done
-    IFS=$OLDIFS
-fi
-
-if [ "${CHANGE_OWNERSHIP}" = "true" ]; then
-    if ! cat /etc/group | grep -e "^dotnet:" > /dev/null 2>&1; then
-        groupadd -r dotnet
-    fi
-    usermod -a -G dotnet "${USERNAME}"
-
-    chown -R "${USERNAME}:dotnet" "${TARGET_DOTNET_ROOT}"
-    chmod -R g+r+w "${TARGET_DOTNET_ROOT}"
-    find "${TARGET_DOTNET_ROOT}" -type d -print0 | xargs -n 1 -0 chmod g+s
-fi
+for version in "${aspNetCoreRuntimeVersions[@]}"; do
+    install_runtime "aspnetcore" "$version"
+done
 
 # Clean up
-if [ "${APT_PREFERENCES_UPDATED}" = "true" ]; then
-    if [ "${APT_PREFERENCES_FILE_ADDED}" = "true" ]; then
-        rm -f /etc/apt/preferences
-    else
-        head -n -3 /etc/apt/preferences > /tmp/preferences-temp && mv /tmp/preferences-temp /etc/apt/preferences
-    fi
-fi
-
 rm -rf /var/lib/apt/lists/*
+rm -rf scripts
 
 echo "Done!"

src/dotnet/scripts/dotnet-helpers.sh

+#!/bin/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/devcontainers/features/tree/main/src/dotnet
+# Maintainer: The Dev Container spec maintainers
+DOTNET_SCRIPTS=$(dirname "${BASH_SOURCE[0]}")
+DOTNET_INSTALL_SCRIPT="$DOTNET_SCRIPTS/vendor/dotnet-install.sh"
+DOTNET_INSTALL_DIR='/usr/share/dotnet'
+
+# Prints the latest dotnet version in the specified channel
+# Usage: fetch_latest_version_in_channel <channel> [<runtime>]
+# Example: fetch_latest_version_in_channel "LTS"
+# Example: fetch_latest_version_in_channel "6.0" "dotnet"
+# Example: fetch_latest_version_in_channel "6.0" "aspnetcore"
+fetch_latest_version_in_channel() {
+    local channel="$1"
+    local runtime="$2"
+    if [ "$runtime" = "dotnet" ]; then
+        wget -qO- "https://dotnetcli.azureedge.net/dotnet/Runtime/$channel/latest.version"
+    elif [ "$runtime" = "aspnetcore" ]; then
+        wget -qO- "https://dotnetcli.azureedge.net/dotnet/aspnetcore/Runtime/$channel/latest.version"
+    else
+        wget -qO- "https://dotnetcli.azureedge.net/dotnet/Sdk/$channel/latest.version"
+    fi
+    
+}
+
+# Prints the latest dotnet version
+# Usage: fetch_latest_version [<runtime>]
+# Example: fetch_latest_version
+# Example: fetch_latest_version "dotnet"
+# Example: fetch_latest_version "aspnetcore"
+fetch_latest_version() {
+    local runtime="$1"
+    local sts_version
+    local lts_version
+    sts_version=$(fetch_latest_version_in_channel "STS" "$runtime")
+    lts_version=$(fetch_latest_version_in_channel "LTS" "$runtime")
+    if [[ "$sts_version" > "$lts_version" ]]; then
+        echo "$sts_version"
+    else
+        echo "$lts_version"
+    fi
+}
+
+# Installs a version of the .NET SDK
+# Usage: install_sdk <version>
+install_sdk() {
+    local inputVersion="$1"
+    local version=""
+    local channel=""
+    if [[ "$inputVersion" == "latest" ]]; then
+        # Fetch the latest version manually, because dotnet-install.sh does not support it directly
+        version=$(fetch_latest_version)
+    elif [[ "$inputVersion" == "lts" ]]; then
+        # When user input is 'lts'
+        # Then version=latest, channel=LTS
+        version="latest"
+        channel="LTS"
+    elif [[ "$inputVersion" =~ ^[0-9]+\.[0-9]+$ ]]; then
+        # When user input is form 'A.B' like '3.1'
+        # Then version=latest, channel=3.1
+        version="latest"
+        channel="$inputVersion"
+    elif [[ "$inputVersion" =~ ^[0-9]+\.[0-9]+\.[0-9]xx$ ]]; then
+        # When user input is form 'A.B.Cxx' like '6.0.4xx'
+        # Then version=latest, channel=6.0.4xx
+        version="latest"
+        channel="$inputVersion"
+    else
+        # Assume version is an exact version string like '6.0.413' or '8.0.100-rc.2.23425.18'
+        version="$inputVersion"
+    fi
+    
+    # Currently this script does not make it possible to qualify the version, 'GA' is always implied
+    echo "Executing $DOTNET_INSTALL_SCRIPT --version $version --channel $channel --install-dir $DOTNET_INSTALL_DIR --no-path"
+    "$DOTNET_INSTALL_SCRIPT" \
+        --version "$version" \
+        --channel "$channel" \
+        --install-dir "$DOTNET_INSTALL_DIR" \
+        --no-path
+}
+
+# Installs a version of the .NET Runtime
+# Usage: install_runtime <runtime> <version>
+install_runtime() {
+    local runtime="$1"
+    local inputVersion="$2"
+    local version=""
+    local channel=""
+    if [[ "$inputVersion" == "latest" ]]; then
+        # Fetch the latest version manually, because dotnet-install.sh does not support it directly
+        version=$(fetch_latest_version "$runtime")
+    elif [[ "$inputVersion" == "lts" ]]; then
+        # When user input is 'lts'
+        # Then version=latest, channel=LTS
+        version="latest"
+        channel="LTS"
+    elif [[ "$inputVersion" =~ ^[0-9]+\.[0-9]+$ ]]; then
+        # When user input is form 'A.B' like '3.1'
+        # Then version=latest, channel=3.1
+        version="latest"
+        channel="$inputVersion"
+    else
+        # Assume version is an exact version string like '6.0.21' or '8.0.0-preview.7.23375.6'
+        version="$inputVersion"
+    fi
+    
+    echo "Executing $DOTNET_INSTALL_SCRIPT --runtime $runtime --version $version --channel $channel --install-dir $DOTNET_INSTALL_DIR --no-path"
+    "$DOTNET_INSTALL_SCRIPT" \
+        --runtime "$runtime" \
+        --version "$version" \
+        --channel "$channel" \
+        --install-dir "$DOTNET_INSTALL_DIR" \
+        --no-path
+}

src/dotnet/scripts/fetch-latest-dotnet-install.sh

+#!/bin/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/devcontainers/features/tree/main/src/dotnet
+# Maintainer: The Dev Container spec maintainers
+#
+# Run this script to replace dotnet-install.sh with the latest and greatest available version
+# 
+DOTNET_SCRIPTS=$(dirname "${BASH_SOURCE[0]}")
+DOTNET_INSTALL_SCRIPT="$DOTNET_SCRIPTS/vendor/dotnet-install.sh"
+
+wget https://dot.net/v1/dotnet-install.sh -O "$DOTNET_INSTALL_SCRIPT"
+chmod +x "$DOTNET_INSTALL_SCRIPT"

src/dotnet/scripts/string-helpers.sh

+#!/bin/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/devcontainers/features/tree/main/src/dotnet
+# Maintainer: The Dev Container spec maintainers
+
+# Removes leading and trailing whitespace from an input string
+# Usage: trim_whitespace <text>
+trim_whitespace() {
+    text="$1"
+
+    # Remove leading spaces
+    while [ "${text:0:1}" == " " ]; do
+        text="${text:1}"
+    done
+
+    # Remove trailing spaces
+    while [ "${text: -1}" == " " ]; do
+        text="${text:0:-1}"
+    done
+
+    echo "$text"
+}
+
+# Splits comma-separated values into an array while ignoring empty entries
+# Usage: split_csv <comma-separated-values>
+split_csv() {
+    local -a values=()
+    while IFS="," read -ra entries; do
+        for entry in "${entries[@]}"; do
+            entry="$(trim_whitespace "$entry")"
+            if [ -n "$entry" ]; then
+                values+=("$entry")
+            fi
+        done
+    done <<< "$1"
+
+    echo "${values[@]}"
+}
\ No newline at end of file

src/dotnet/scripts/vendor/README.md

+### **IMPORTANT NOTE**
+
+Scripts in this directory are sourced externally and not maintained by the Dev Container spec maintainers. Do not make changes directly as they might be overwritten at any moment.
+
+## dotnet-install.sh
+
+`dotnet-install.sh` is a copy of <https://dot.net/v1/dotnet-install.sh>. ([Script reference](https://learn.microsoft.com/en-us/dotnet/core/tools/dotnet-install-script))
+
+Quick options reminder for `dotnet-install.sh`:
+
+- `--version`: `"latest"` (default) or an exact version in the form A.B.C like `"6.0.413"`
+- `--channel`: `"LTS"` (default), `"STS"`, a two-part version in the form A.B like `"6.0"` or three-part form A.B.Cxx like `"6.0.1xx"`
+- `--quality`: `"daily"`, `"preview"` or `"GA"`
+- The channel option is only used when version is 'latest' because an exact version overrides the channel option
+- The quality option is only used when channel is 'A.B' or 'A.B.Cxx' because it can't be used with STS or LTS
+
+Examples
+
+```
+dotnet-install.sh [--version latest] [--channel LTS]
+dotnet-install.sh [--version latest] --channel STS
+dotnet-install.sh [--version latest] --channel 6.0 [--quality GA]
+dotnet-install.sh [--version latest] --channel 6.0.4xx [--quality GA]
+dotnet-install.sh [--version latest] --channel 8.0 --quality preview
+dotnet-install.sh [--version latest] --channel 8.0 --quality daily
+dotnet-install.sh --version 6.0.413
+```
\ No newline at end of file

test/dotnet/dotnet_env.sh

+#!/bin/bash
+export DOTNET_NOLOGO=true
+export DOTNET_SKIP_FIRST_TIME_EXPERIENCE=true
+export DOTNET_GENERATE_ASPNET_CERTIFICATE=false
\ No newline at end of file

test/dotnet/dotnet_helpers.sh

+#!/bin/bash
+
+# Prints the latest dotnet version in the specified channel
+# Usage: fetch_latest_version_in_channel <channel> [<runtime>]
+# Example: fetch_latest_version_in_channel "LTS"
+# Example: fetch_latest_version_in_channel "6.0" "dotnet"
+# Example: fetch_latest_version_in_channel "6.0" "aspnetcore"
+fetch_latest_version_in_channel() {
+    local channel="$1"
+    local runtime="$2"
+    if [ "$runtime" = "dotnet" ]; then
+        wget -qO- "https://dotnetcli.azureedge.net/dotnet/Runtime/$channel/latest.version"
+    elif [ "$runtime" = "aspnetcore" ]; then
+        wget -qO- "https://dotnetcli.azureedge.net/dotnet/aspnetcore/Runtime/$channel/latest.version"
+    else
+        wget -qO- "https://dotnetcli.azureedge.net/dotnet/Sdk/$channel/latest.version"
+    fi
+    
+}
+
+# Prints the latest dotnet version
+# Usage: fetch_latest_version [<runtime>]
+# Example: fetch_latest_version
+# Example: fetch_latest_version "dotnet"
+# Example: fetch_latest_version "aspnetcore"
+fetch_latest_version() {
+    local runtime="$1"
+    local sts_version
+    local lts_version
+    sts_version=$(fetch_latest_version_in_channel "STS" "$runtime")
+    lts_version=$(fetch_latest_version_in_channel "LTS" "$runtime")
+    if [[ "$sts_version" > "$lts_version" ]]; then
+        echo "$sts_version"
+    else
+        echo "$lts_version"
+    fi
+}
+
+# Asserts that the specified .NET SDK version is installed
+# Returns a non-zero exit code if the check fails
+# Usage: is_dotnet_sdk_version_installed <version>
+# Example: is_dotnet_sdk_version_installed "6.0"
+# Example: is_dotnet_sdk_version_installed "6.0.412"
+is_dotnet_sdk_version_installed() {
+    local expected="$1"
+    dotnet --list-sdks | grep --fixed-strings --silent "$expected"
+    return $?
+}
+
+
+# Asserts that the specified .NET Runtime version is installed
+# Returns a non-zero exit code if the check fails
+# Usage: is_dotnet_runtime_version_installed <version>
+# Example: is_dotnet_runtime_version_installed "6.0"
+# Example: is_dotnet_runtime_version_installed "6.0.412"
+is_dotnet_runtime_version_installed() {
+    local expected="$1"
+    dotnet --list-runtimes | grep --fixed-strings --silent "Microsoft.NETCore.App $expected"
+    return $?
+}
+
+# Asserts that the specified ASP.NET Core Runtime version is installed
+# Returns a non-zero exit code if the check fails
+# Usage: is_aspnetcore_runtime_version_installed <version>
+# Example: is_aspnetcore_runtime_version_installed "6.0"
+# Example: is_aspnetcore_runtime_version_installed "6.0.412"
+is_aspnetcore_runtime_version_installed() {
+    local expected="$1"
+    dotnet --list-runtimes | grep --fixed-strings --silent "Microsoft.AspNetCore.App $expected"
+    return $?
+}
\ No newline at end of file

test/dotnet/install_additional_dotnet.sh

-#!/bin/bash
-
-set -e
-
-# Optional: Import test library
-source dev-container-features-test-lib
-
-check "dotnet version 6.0.301 installed as default" bash -c "dotnet --version | grep 6.0.301"
-check "dotnet version 5.0 installed"  bash -c "ls -l /usr/local/dotnet | grep 5.0"
-check "dotnet version 3.1.420 installed"  bash -c "ls -l /usr/local/dotnet | grep 3.1.420"
-
-# Verify current symlink exists and works
-check "current link dotnet" /usr/local/dotnet/current/dotnet --info
-check "current link sdk" ls -l /usr/local/dotnet/current/sdk
-
-# Report result
-reportResults

test/dotnet/install_aspnetcore_runtime_only.sh

+#!/bin/bash
+
+set -e
+
+# Optional: Import test library bundled with the devcontainer CLI
+# See https://github.com/devcontainers/cli/blob/HEAD/docs/features/test.md#dev-container-features-test-lib
+# Provides the 'check' and 'reportResults' commands.
+source dev-container-features-test-lib
+
+# Feature-specific tests
+# The 'check' command comes from the dev-container-features-test-lib. Syntax is...
+# check <LABEL> <cmd> [args...]
+source dotnet_env.sh
+source dotnet_helpers.sh
+
+expected=$(fetch_latest_version "aspnetcore")
+
+check "Latest ASP.NET Core Runtime version installed" \
+is_aspnetcore_runtime_version_installed "$expected"
+
+# Expect this check to fail in November 2023 when .NET 8.0 becomes GA
+check "It is a flavor of .NET 7.0" \
+is_aspnetcore_runtime_version_installed "7.0"
+
+# Report results
+# If any of the checks above exited with a non-zero exit code, the test will fail.
+reportResults
\ No newline at end of file

test/dotnet/install_dotnet_3.sh

-#!/bin/bash
-
-set -e
-
-# Optional: Import test library
-source dev-container-features-test-lib
-
-check "dotnet sdks" dotnet --list-sdks
-check "some major version of dotnet 3 is installed" bash -c "dotnet --list-sdks |  grep '3\.[0-9]*\.[0-9]*'"
-check "dotnet version 3 installed"  bash -c "ls -l /usr/share/dotnet/sdk | grep '3\.[0-9]*\.[0-9]*'"
-
-# Verify current symlink exists and works
-check "current link dotnet" /usr/local/dotnet/current/dotnet --info
-check "current link sdk" ls -l /usr/local/dotnet/current/sdk
-
-# Report result
-reportResults

test/dotnet/install_dotnet_6_bullseye.sh

-#!/bin/bash
-
-set -e
-
-# Optional: Import test library
-source dev-container-features-test-lib
-
-check "dotnet sdks" dotnet --list-sdks
-check "some major version of dotnet 6 is installed" bash -c "dotnet --list-sdks |  grep '6\.[0-9]*\.[0-9]*'"
-check "dotnet version 6 installed"  bash -c "ls -l /usr/share/dotnet/sdk | grep '6\.[0-9]*\.[0-9]*'"
-
-# Verify current symlink exists and works
-check "current link dotnet" /usr/local/dotnet/current/dotnet --info
-check "current link sdk" ls -l /usr/local/dotnet/current/sdk
-
-# Report result
-reportResults

test/dotnet/install_dotnet_6_focal.sh

-#!/bin/bash
-
-set -e
-
-# Optional: Import test library
-source dev-container-features-test-lib
-
-check "dotnet sdks" dotnet --list-sdks
-check "some major version of dotnet 6 is installed" bash -c "dotnet --list-sdks |  grep '6\.[0-9]*\.[0-9]*'"
-check "dotnet version 6 installed"  bash -c "ls -l /usr/share/dotnet/sdk | grep '6\.[0-9]*\.[0-9]*'"
-
-# Verify current symlink exists and works
-check "current link dotnet" /usr/local/dotnet/current/dotnet --info
-check "current link sdk" ls -l /usr/local/dotnet/current/sdk
-
-# Report result
-reportResults

test/dotnet/install_dotnet_6_jammy.sh

-#!/bin/bash
-
-set -e
-
-# Optional: Import test library
-source dev-container-features-test-lib
-
-check "dotnet sdks" dotnet --list-sdks
-check "some major version of dotnet 6 is installed" bash -c "dotnet --list-sdks |  grep '6\.[0-9]*\.[0-9]*'"
-check "dotnet version 6 installed"  bash -c "ls -l /usr/lib/dotnet/sdk | grep '6\.[0-9]*\.[0-9]*'"
-
-# Verify current symlink exists and works
-check "current link dotnet" /usr/local/dotnet/current/dotnet --info
-check "current link sdk" ls -l /usr/local/dotnet/current/sdk
-
-# Report result
-reportResults

test/dotnet/install_dotnet_7_bullseye.sh

-#!/bin/bash
-
-set -e
-
-# Optional: Import test library
-source dev-container-features-test-lib
-
-check "dotnet sdks" dotnet --list-sdks
-check "some major version of dotnet 7 is installed" bash -c "dotnet --list-sdks |  grep '7\.[0-9]*\.[0-9]*'"
-check "dotnet version 7 installed"  bash -c "ls -l /usr/share/dotnet/sdk | grep '7\.[0-9]*\.[0-9]*'"
-
-# Verify current symlink exists and works
-check "current link dotnet" /usr/local/dotnet/current/dotnet --info
-check "current link sdk" ls -l /usr/local/dotnet/current/sdk
-
-# Report result
-reportResults

test/dotnet/install_dotnet_7_jammy.sh

-#!/bin/bash
-
-set -e
-
-# Optional: Import test library
-source dev-container-features-test-lib
-
-check "dotnet sdks" dotnet --list-sdks
-check "some major version of dotnet 7 is installed" bash -c "dotnet --list-sdks |  grep '7\.[0-9]*\.[0-9]*'"
-check "dotnet version 7 installed"  bash -c "ls -l /usr/lib/dotnet/sdk | grep '7\.[0-9]*\.[0-9]*'"
-
-# Verify current symlink exists and works
-check "current link dotnet" /usr/local/dotnet/current/dotnet --info
-check "current link sdk" ls -l /usr/local/dotnet/current/sdk
-
-# Report result
-reportResults

test/dotnet/install_dotnet_exact_version.sh

+#!/bin/bash
+
+set -e
+
+# Optional: Import test library bundled with the devcontainer CLI
+# See https://github.com/devcontainers/cli/blob/HEAD/docs/features/test.md#dev-container-features-test-lib
+# Provides the 'check' and 'reportResults' commands.
+source dev-container-features-test-lib
+
+# Feature-specific tests
+# The 'check' command comes from the dev-container-features-test-lib. Syntax is...
+# check <LABEL> <cmd> [args...]
+source dotnet_env.sh
+source dotnet_helpers.sh
+
+check ".NET SDK 8.0.100-preview.6.23330.14 installed" \
+is_dotnet_sdk_version_installed "8.0.100-preview.6.23330.14"
+
+check "Build and run example project" \
+dotnet run --project projects/net8.0 
+
+# Report results
+# If any of the checks above exited with a non-zero exit code, the test will fail.
+reportResults
\ No newline at end of file

test/dotnet/install_dotnet_global_tool.sh

+#!/bin/bash
+
+set -e
+
+# Optional: Import test library bundled with the devcontainer CLI
+# See https://github.com/devcontainers/cli/blob/HEAD/docs/features/test.md#dev-container-features-test-lib
+# Provides the 'check' and 'reportResults' commands.
+source dev-container-features-test-lib
+
+# Feature-specific tests
+# The 'check' command comes from the dev-container-features-test-lib. Syntax is...
+# check <LABEL> <cmd> [args...]
+source dotnet_env.sh
+source dotnet_helpers.sh
+
+# From https://learn.microsoft.com/en-us/dotnet/core/tools/global-tools
+check "Install a .NET global tool" \
+dotnet tool install --global dotnetsay
+
+check "Run the tool" \
+dotnetsay "$(dotnet --info)"
+
+# Report results
+# If any of the checks above exited with a non-zero exit code, the test will fail.
+reportResults
\ No newline at end of file

test/dotnet/install_dotnet_latest.sh

-#!/bin/bash
-
-set -e
-
-# Optional: Import test library
-source dev-container-features-test-lib
-
-check "dotnet sdks" dotnet --list-sdks
-check "some major version of dotnet 7 is installed" bash -c "dotnet --list-sdks |  grep '7\.[0-9]*\.[0-9]*'"
-check "dotnet version 7 installed"  bash -c "ls -l /usr/lib/dotnet/sdk | grep '7\.[0-9]*\.[0-9]*'"
-
-# Verify current symlink exists and works
-check "current link dotnet" /usr/local/dotnet/current/dotnet --info
-check "current link sdk" ls -l /usr/local/dotnet/current/sdk
-
-# Report result
-reportResults

test/dotnet/install_dotnet_latest_when_version_is_empty.sh

+#!/bin/bash
+
+set -e
+
+# Optional: Import test library bundled with the devcontainer CLI
+# See https://github.com/devcontainers/cli/blob/HEAD/docs/features/test.md#dev-container-features-test-lib
+# Provides the 'check' and 'reportResults' commands.
+source dev-container-features-test-lib
+
+# Feature-specific tests
+# The 'check' command comes from the dev-container-features-test-lib. Syntax is...
+# check <LABEL> <cmd> [args...]
+source dotnet_env.sh
+source dotnet_helpers.sh
+
+expected=$(fetch_latest_version)
+
+check "Latest .NET SDK version installed" \
+is_dotnet_sdk_version_installed "$expected"
+
+# Expect this check to fail in November 2023 when .NET 8.0 becomes GA
+check "It is a flavor of .NET 7.0" \
+is_dotnet_sdk_version_installed "7.0"
+
+check "Build and run example project" \
+dotnet run --project projects/net7.0
+
+# Report results
+# If any of the checks above exited with a non-zero exit code, the test will fail.
+reportResults
\ No newline at end of file

test/dotnet/install_dotnet_lts.sh

@@ -2,16 +2,25 @@
 
 set -e
 
-# Optional: Import test library
+# Optional: Import test library bundled with the devcontainer CLI
+# See https://github.com/devcontainers/cli/blob/HEAD/docs/features/test.md#dev-container-features-test-lib
+# Provides the 'check' and 'reportResults' commands.
 source dev-container-features-test-lib
 
-check "dotnet sdks" dotnet --list-sdks
-check "some major version of dotnet 6 is installed" bash -c "dotnet --list-sdks |  grep '6\.[0-9]*\.[0-9]*'"
-check "dotnet version 6 installed"  bash -c "ls -l /usr/share/dotnet/sdk | grep '6\.[0-9]*\.[0-9]*'"
+# Feature-specific tests
+# The 'check' command comes from the dev-container-features-test-lib. Syntax is...
+# check <LABEL> <cmd> [args...]
+source dotnet_env.sh
+source dotnet_helpers.sh
 
-# Verify current symlink exists and works
-check "current link dotnet" /usr/local/dotnet/current/dotnet --info
-check "current link sdk" ls -l /usr/local/dotnet/current/sdk
+expected=$(fetch_latest_version_in_channel "LTS")
 
-# Report result
-reportResults
+check "Latest LTS version installed" \
+is_dotnet_sdk_version_installed "$expected"
+
+check "Build and run example project" \
+dotnet run --project projects/net6.0
+
+# Report results
+# If any of the checks above exited with a non-zero exit code, the test will fail.
+reportResults
\ No newline at end of file

test/dotnet/install_dotnet_multiple_versions.sh

+#!/bin/bash
+
+set -e
+
+# Optional: Import test library bundled with the devcontainer CLI
+# See https://github.com/devcontainers/cli/blob/HEAD/docs/features/test.md#dev-container-features-test-lib
+# Provides the 'check' and 'reportResults' commands.
+source dev-container-features-test-lib
+
+# Feature-specific tests
+# The 'check' command comes from the dev-container-features-test-lib. Syntax is...
+# check <LABEL> <cmd> [args...]
+source dotnet_env.sh
+source dotnet_helpers.sh
+
+check ".NET SDK 8.0 installed" \
+is_dotnet_sdk_version_installed "8.0"
+
+check ".NET SDK 7.0 installed" \
+is_dotnet_sdk_version_installed "7.0"
+
+check ".NET SDK 6.0 installed" \
+is_dotnet_sdk_version_installed "6.0"
+
+check "Build example class library" \
+dotnet build projects/multitargeting
+
+# Report results
+# If any of the checks above exited with a non-zero exit code, the test will fail.
+reportResults
\ No newline at end of file

test/dotnet/install_dotnet_runtime_only.sh

+#!/bin/bash
+
+set -e
+
+# Optional: Import test library bundled with the devcontainer CLI
+# See https://github.com/devcontainers/cli/blob/HEAD/docs/features/test.md#dev-container-features-test-lib
+# Provides the 'check' and 'reportResults' commands.
+source dev-container-features-test-lib
+
+# Feature-specific tests
+# The 'check' command comes from the dev-container-features-test-lib. Syntax is...
+# check <LABEL> <cmd> [args...]
+source dotnet_env.sh
+source dotnet_helpers.sh
+
+expected=$(fetch_latest_version "dotnet")
+
+check "Latest .NET Runtime version installed" \
+is_dotnet_runtime_version_installed "$expected"
+
+# Expect this check to fail in November 2023 when .NET 8.0 becomes GA
+check "It is a flavor of .NET 7.0" \
+is_dotnet_runtime_version_installed "7.0"
+
+# Report results
+# If any of the checks above exited with a non-zero exit code, the test will fail.
+reportResults
\ No newline at end of file

test/dotnet/install_dotnet_specific_release.sh

+#!/bin/bash
+
+set -e
+
+# Optional: Import test library bundled with the devcontainer CLI
+# See https://github.com/devcontainers/cli/blob/HEAD/docs/features/test.md#dev-container-features-test-lib
+# Provides the 'check' and 'reportResults' commands.
+source dev-container-features-test-lib
+
+# Feature-specific tests
+# The 'check' command comes from the dev-container-features-test-lib. Syntax is...
+# check <LABEL> <cmd> [args...]
+source dotnet_env.sh
+source dotnet_helpers.sh
+
+expected=$(fetch_latest_version_in_channel "3.1")
+
+check ".NET Core SDK 3.1 installed" \
+is_dotnet_sdk_version_installed "$expected"
+
+check "Build and run example project" \
+dotnet run --project projects/netcoreapp3.1 
+
+# Report results
+# If any of the checks above exited with a non-zero exit code, the test will fail.
+reportResults
\ No newline at end of file

test/dotnet/install_dotnet_specific_release_and_feature_band.sh

+#!/bin/bash
+
+set -e
+
+# Optional: Import test library bundled with the devcontainer CLI
+# See https://github.com/devcontainers/cli/blob/HEAD/docs/features/test.md#dev-container-features-test-lib
+# Provides the 'check' and 'reportResults' commands.
+source dev-container-features-test-lib
+
+# Feature-specific tests
+# The 'check' command comes from the dev-container-features-test-lib. Syntax is...
+# check <LABEL> <cmd> [args...]
+source dotnet_env.sh
+source dotnet_helpers.sh
+
+check ".NET SDK 5.0.3xx installed" \
+is_dotnet_sdk_version_installed "5.0.3"
+
+check "Build and run example project" \
+dotnet run --project projects/net5.0 
+
+# Report results
+# If any of the checks above exited with a non-zero exit code, the test will fail.
+reportResults
\ No newline at end of file

test/dotnet/install_wo_apt.sh

-#!/bin/bash
-
-set -e
-
-# Optional: Import test library
-source dev-container-features-test-lib
-
-check "dotnet sdks" dotnet --list-sdks
-check "some major version of dotnet 7 is installed" bash -c "dotnet --list-sdks |  grep '7\.[0-9]*\.[0-9]*'"
-check "dotnet version 7 installed"  bash -c "ls -l /usr/local/dotnet | grep '7\.[0-9]*\.[0-9]*'"
-
-# Verify current symlink exists and works
-check "current link dotnet" /usr/local/dotnet/current/dotnet --info
-check "current link sdk" ls -l /usr/local/dotnet/current/sdk
-
-# Report result
-reportResults

test/dotnet/projects/.gitignore

+bin
+obj
\ No newline at end of file

test/dotnet/projects/multitargeting/Class1.cs

+public class Class1
+{
+
+}

test/dotnet/projects/multitargeting/example_classlib.csproj

+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFrameworks>net8.0;net7.0;net6.0</TargetFrameworks>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

test/dotnet/projects/net5.0/Program.cs

+using System;
+using System.Collections.Generic;
+using Newtonsoft.Json;
+
+string json = @"{
+  ""Name"": ""Inception"",
+  ""ReleaseDate"": ""2010-07-08T00:00:00"",
+  ""Genres"": [
+    ""Action"",
+    ""Thriller""
+  ]
+}";
+
+Movie? m = JsonConvert.DeserializeObject<Movie>(json);
+
+if (m == default)
+{
+    Console.WriteLine("Decoding failed!");
+}
+else
+{
+    Console.WriteLine($"Movie name: {m.Name}");
+    Console.WriteLine($"Release Date: {m.ReleaseDate}");
+    Console.WriteLine($"Genres: {string.Join(", ", m.Genres)}");
+}
+
+class Movie
+{
+    public string Name { get; set; } = "Default Name";
+    public DateTime ReleaseDate { get; set; }
+    public List<string> Genres { get; set; } = new List<string>();
+}

test/dotnet/projects/net5.0/example_project.csproj

+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net5.0</TargetFramework>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
+  </ItemGroup>
+
+</Project>
\ No newline at end of file

test/dotnet/projects/net6.0/Program.cs

+using Newtonsoft.Json;
+
+string json = @"{
+  ""Name"": ""Inception"",
+  ""ReleaseDate"": ""2010-07-08T00:00:00"",
+  ""Genres"": [
+    ""Action"",
+    ""Thriller""
+  ]
+}";
+
+Movie? m = JsonConvert.DeserializeObject<Movie>(json);
+
+if (m == default)
+{
+    Console.WriteLine("Decoding failed!");
+}
+else
+{
+    Console.WriteLine($"Movie name: {m.Name}");
+    Console.WriteLine($"Release Date: {m.ReleaseDate}");
+    Console.WriteLine($"Genres: {string.Join(", ", m.Genres)}");
+}
+
+class Movie
+{
+    public string Name { get; set; } = "Default Name";
+    public DateTime ReleaseDate { get; set; }
+    public List<string> Genres { get; set; } = new List<string>();
+}

test/dotnet/projects/net6.0/example_project.csproj

+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
+  </ItemGroup>
+
+</Project>
\ No newline at end of file

test/dotnet/projects/net7.0/Program.cs

+using Newtonsoft.Json;
+
+string json = @"{
+  ""Name"": ""Inception"",
+  ""ReleaseDate"": ""2010-07-08T00:00:00"",
+  ""Genres"": [
+    ""Action"",
+    ""Thriller""
+  ]
+}";
+
+Movie? m = JsonConvert.DeserializeObject<Movie>(json);
+
+if (m == default)
+{
+    Console.WriteLine("Decoding failed!");
+}
+else
+{
+    Console.WriteLine($"Movie name: {m.Name}");
+    Console.WriteLine($"Release Date: {m.ReleaseDate}");
+    Console.WriteLine($"Genres: {string.Join(", ", m.Genres)}");
+}
+
+class Movie
+{
+    public string Name { get; set; } = "Default Name";
+    public DateTime ReleaseDate { get; set; }
+    public List<string> Genres { get; set; } = new List<string>();
+}

test/dotnet/projects/net7.0/example_project.csproj

+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net7.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
+  </ItemGroup>
+
+</Project>
\ No newline at end of file

test/dotnet/projects/net8.0/Program.cs

+using Newtonsoft.Json;
+
+string json = """
+{
+  "Name": "Inception",
+  "ReleaseDate": "2010-07-08T00:00:00",
+  "Genres": [
+    "Action",
+    "Thriller"
+  ]
+}
+""";
+
+Movie? m = JsonConvert.DeserializeObject<Movie>(json);
+
+if (m == default)
+{
+    Console.WriteLine("Decoding failed!");
+}
+else
+{
+    Console.WriteLine($"Movie name: {m.Name}");
+    Console.WriteLine($"Release Date: {m.ReleaseDate}");
+    Console.WriteLine($"Genres: {string.Join(", ", m.Genres)}");
+}
+
+class Movie
+{
+    public string Name { get; set; } = "Default Name";
+    public DateTime ReleaseDate { get; set; }
+    public List<string> Genres { get; set; } = new List<string>();
+}

test/dotnet/projects/net8.0/example_project.csproj

+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
+  </ItemGroup>
+
+</Project>
\ No newline at end of file

test/dotnet/projects/netcoreapp3.1/Program.cs

+using System;
+using System.Collections.Generic;
+using Newtonsoft.Json;
+
+class Program
+{
+    public static void Main()
+    {
+        string json = @"{
+          ""Name"": ""Inception"",
+          ""ReleaseDate"": ""2010-07-08T00:00:00"",
+          ""Genres"": [
+            ""Action"",
+            ""Thriller""
+          ]
+        }";
+
+        Movie? m = JsonConvert.DeserializeObject<Movie>(json);
+
+        if (m == default)
+        {
+            Console.WriteLine("Decoding failed!");
+        }
+        else
+        {
+            Console.WriteLine($"Movie name: {m.Name}");
+            Console.WriteLine($"Release Date: {m.ReleaseDate}");
+            Console.WriteLine($"Genres: {string.Join(", ", m.Genres)}");
+        }
+    }
+}
+
+
+class Movie
+{
+    public string Name { get; set; } = "Default Name";
+    public DateTime ReleaseDate { get; set; }
+    public List<string> Genres { get; set; } = new List<string>();
+}

test/dotnet/projects/netcoreapp3.1/example_project.csproj

+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
+  </ItemGroup>
+
+</Project>
\ No newline at end of file

test/dotnet/scenarios.json

 {
-    "install_additional_dotnet": {
-        "image": "ubuntu:focal",
+    "install_dotnet_lts": {
+        "image": "mcr.microsoft.com/devcontainers/base:ubuntu",
+        "remoteUser": "vscode",
         "features": {
             "dotnet": {
-                "version": "6.0.301",
-                "additionalVersions": "5.0,3.1.420"
+                "version": "lts"
             }
         }
     },
-    "install_dotnet_3": {
-        "image": "ubuntu:focal",
+    "install_dotnet_specific_release": {
+        "image": "mcr.microsoft.com/devcontainers/base:ubuntu-20.04",
+        "remoteUser": "vscode",
         "features": {
             "dotnet": {
-                "version": "3"
+                "version": "3.1"
             }
         }
     },
-    "install_dotnet_6_bullseye": {
-        "image": "debian:bullseye",
+    "install_dotnet_specific_release_and_feature_band": {
+        "image": "mcr.microsoft.com/devcontainers/base:ubuntu-20.04",
+        "remoteUser": "vscode",
         "features": {
             "dotnet": {
-                "version": "6"
+                "version": "5.0.3xx"
             }
         }
     },
-    "install_dotnet_6_focal": {
-        "image": "ubuntu:focal",
+    "install_dotnet_exact_version": {
+        "image": "mcr.microsoft.com/devcontainers/base:ubuntu",
+        "remoteUser": "vscode",
         "features": {
             "dotnet": {
-                "version": "6"
+                "version": "8.0.100-preview.6.23330.14"
             }
         }
     },
-    "install_dotnet_7_bullseye": {
-        "image": "debian:bullseye",
+    "install_dotnet_multiple_versions": {
+        "image": "mcr.microsoft.com/devcontainers/base:ubuntu",
+        "remoteUser": "vscode",
         "features": {
             "dotnet": {
-                "version": "7"
+                "version": "8.0.100-preview.6.23330.14",
+                "additionalVersions": [
+                    "7.0",
+                    "6.0"
+                ]
             }
         }
     },
-    "install_dotnet_7_jammy": {
-        "image": "ubuntu:jammy",
+    "install_dotnet_global_tool": {
+        "image": "mcr.microsoft.com/devcontainers/base:ubuntu",
+        "remoteUser": "vscode",
         "features": {
-            "dotnet": {
-                "version": "7"
-            }
+            "dotnet": {}
         }
     },
-    "install_dotnet_6_jammy": {
-        "image": "mcr.microsoft.com/devcontainers/base:jammy",
+    "install_dotnet_latest_when_version_is_empty": {
+        "image": "mcr.microsoft.com/devcontainers/base:ubuntu",
+        "remoteUser": "vscode",
         "features": {
-            "dotnet": {
-                "version": "6"
-            }
+            "dotnet": ""
         }
     },
-    "install_dotnet_latest": {
-        "image": "ubuntu:jammy",
+    "install_dotnet_runtime_only": {
+        "image": "mcr.microsoft.com/devcontainers/base:ubuntu",
+        "remoteUser": "vscode",
         "features": {
             "dotnet": {
-                "version": "latest"
-            }
-        }
-    },
-    "install_dotnet_lts": {
-        "image": "ubuntu:focal",
-        "features": {
-            "dotnet": {
-                "version": "lts"
+                "version": "none",
+                "dotnetRuntimeVersions": "latest"
             }
         }
     },
-    "install_wo_apt": {
-        "image": "ubuntu:jammy",
+    "install_aspnetcore_runtime_only": {
+        "image": "mcr.microsoft.com/devcontainers/base:ubuntu",
+        "remoteUser": "vscode",
         "features": {
             "dotnet": {
-                "version": "7",
-                "installUsingApt": false
+                "version": "none",
+                "aspnetcoreRuntimeVersions": "latest"
             }
         }
     }

test/dotnet/test.sh

@@ -2,20 +2,29 @@
 
 set -e
 
-# Optional: Import test library
+# Optional: Import test library bundled with the devcontainer CLI
+# See https://github.com/devcontainers/cli/blob/HEAD/docs/features/test.md#dev-container-features-test-lib
+# Provides the 'check' and 'reportResults' commands.
 source dev-container-features-test-lib
 
-# Definition specific tests
-check "dotnet" dotnet --info
-check "sdks" dotnet --list-sdks
-check "version" dotnet --version
+# Feature-specific tests
+# The 'check' command comes from the dev-container-features-test-lib. Syntax is...
+# check <LABEL> <cmd> [args...]
+source dotnet_env.sh
+source dotnet_helpers.sh
 
-echo "Validating expected version present..."
-check "some major version of dotnet (7/8) is installed" bash -c "dotnet --version |  grep '[7-8]\.[0-9]*\.[0-9]*'"
+expected=$(fetch_latest_version)
 
-# Verify current symlink exists and works
-check "current link dotnet" /usr/local/dotnet/current/dotnet --info
-check "current link sdk" ls -l /usr/local/dotnet/current/sdk
+check "Latest .NET SDK version installed" \
+is_dotnet_sdk_version_installed "$expected"
 
-# Report result
+# Expect this check to fail in November 2023 when .NET 8.0 becomes GA
+check "It is a flavor of .NET 7.0" \
+is_dotnet_sdk_version_installed "7.0"
+
+check "Build and run example project" \
+dotnet run --project projects/net7.0
+
+# Report results
+# If any of the checks above exited with a non-zero exit code, the test will fail.
 reportResults
\ No newline at end of file