1 files changed, 119 insertions, 0 deletions
diff --git a/src/dotnet/scripts/dotnet-helpers.sh b/src/dotnet/scripts/dotnet-helpers.sh
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+++ b/src/dotnet/scripts/dotnet-helpers.sh
@@ -0,0 +1,119 @@
+#!/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
+}