Install-DotNetSdk.ps1

#!/usr/bin/env pwsh
#
# Copyright (c) .NET Foundation and contributors. All rights reserved.
# Licensed under the MIT license. See LICENSE file in the project root for full license information.
#

<#
.SYNOPSIS
Install the .NET Core SDK at the specified path.

.PARAMETER InstallPath
The path where the .NET Core SDK is to be installed.

.PARAMETER Channel
The version of the .NET Core SDK to be installed.

#>
[cmdletbinding()]
param(
    [string]
    $InstallPath,
    [string]
    $Channel = "10.0"
)

Set-StrictMode -Version Latest
$ErrorActionPreference = 'Stop'

if (!(Test-Path "$InstallPath")) {
    mkdir "$InstallPath" | Out-Null
}

$IsRunningOnUnix = $PSVersionTable.contains("Platform") -and $PSVersionTable.Platform -eq "Unix"
if ($IsRunningOnUnix) {
    $DotnetInstallScript = "dotnet-install.sh"
}
else {
    $DotnetInstallScript = "dotnet-install.ps1"
}

$DotnetInstallScriptPath = Join-Path -Path $InstallPath -ChildPath $DotnetInstallScript

if (!(Test-Path $DotnetInstallScriptPath)) {
    [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12;
    & "$PSScriptRoot/Invoke-WithRetry.ps1" "Invoke-WebRequest 'https://builds.dotnet.microsoft.com/dotnet/scripts/v1/$DotnetInstallScript' -OutFile $DotnetInstallScriptPath"
}

$DotnetChannel = $Channel

$InstallFailed = $false
if ($IsRunningOnUnix) {
    & chmod +x $DotnetInstallScriptPath
    & "$PSScriptRoot/Invoke-WithRetry.ps1" "$DotnetInstallScriptPath --channel $DotnetChannel --install-dir $InstallPath" -Retries 5
    $InstallFailed = ($LASTEXITCODE -ne 0)
}
else {
    & "$PSScriptRoot/Invoke-WithRetry.ps1" "$DotnetInstallScriptPath -Channel $DotnetChannel -InstallDir $InstallPath" -Retries 5
    $InstallFailed = (-not $?)
}

# See https://github.com/NuGet/NuGet.Client/pull/4259
$Env:NUGET_EXPERIMENTAL_CHAIN_BUILD_RETRY_POLICY = "6,1500"

if ($InstallFailed) { throw "Failed to install the .NET Core SDK" }