diff --git a/__tests__/csc.test.ts b/__tests__/csc.test.ts
new file mode 100644
index 0000000..aa0d497
--- /dev/null
+++ b/__tests__/csc.test.ts
@@ -0,0 +1,23 @@
+import fs = require('fs');
+
+describe('csc tests', () => {
+  it('Valid regular expression', async () => {
+    var cscFile = require('../.github/csc.json');
+    var regex = cscFile['problemMatcher'][0]['pattern'][0]['regexp'];
+
+    console.log(regex);
+    var re = new RegExp(regex);
+
+    // Ideally we would verify that this
+    var stringsToMatch = [
+      'Program.cs(10,79): error CS1002: ; expected [/Users/zacharyeisinger/Documents/repo/setup-dotnet/__tests__/sample-broken-csproj/sample.csproj]',
+      "S:\\Msbuild\\src\\Build\\Evaluation\\ExpressionShredder.cs(33,7): error CS1003: Syntax error, ',' expected [S:\\msbuild\\src\\Build\\Microsoft.Build.csproj > Properties:prop]"
+    ];
+
+    stringsToMatch.forEach(string => {
+      var matchStr = string.match(re);
+      console.log(matchStr);
+      expect(matchStr).toEqual(expect.anything());
+    });
+  }, 10000);
+});
diff --git a/externals/install-dotnet.ps1 b/externals/install-dotnet.ps1
index 16e9be8..4260317 100644
--- a/externals/install-dotnet.ps1
+++ b/externals/install-dotnet.ps1
@@ -1,686 +1,879 @@
-#
-# 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
-    Installs dotnet cli
-.DESCRIPTION
-    Installs dotnet cli. If dotnet installation already exists in the given directory
-    it will update it only if the requested version differs from the one already installed.
-.PARAMETER Channel
-    Default: LTS
-    Download from the Channel specified. Possible values:
-    - Current - most current release
-    - LTS - most current supported release
-    - 2-part version in a format A.B - represents a specific release
-          examples: 2.0, 1.0
-    - Branch name
-          examples: release/2.0.0, Master
-    Note: The version parameter overrides the channel parameter.
-.PARAMETER Version
-    Default: latest
-    Represents a build version on specific channel. Possible values:
-    - latest - most latest build on specific channel
-    - coherent - most latest coherent build on specific channel
-          coherent applies only to SDK downloads
-    - 3-part version in a format A.B.C - represents specific version of build
-          examples: 2.0.0-preview2-006120, 1.1.0
-.PARAMETER InstallDir
-    Default: %LocalAppData%\Microsoft\dotnet
-    Path to where to install dotnet. Note that binaries will be placed directly in a given directory.
-.PARAMETER Architecture
-    Default: <auto> - this value represents currently running OS architecture
-    Architecture of dotnet binaries to be installed.
-    Possible values are: <auto>, amd64, x64, x86, arm64, arm
-.PARAMETER SharedRuntime
-    This parameter is obsolete and may be removed in a future version of this script.
-    The recommended alternative is '-Runtime dotnet'.
-    Installs just the shared runtime bits, not the entire SDK.
-.PARAMETER Runtime
-    Installs just a shared runtime, not the entire SDK.
-    Possible values:
-        - dotnet     - the Microsoft.NETCore.App shared runtime
-        - aspnetcore - the Microsoft.AspNetCore.App shared runtime
-        - windowsdesktop - the Microsoft.WindowsDesktop.App shared runtime
-.PARAMETER DryRun
-    If set it will not perform installation but instead display what command line to use to consistently install
-    currently requested version of dotnet cli. In example if you specify version 'latest' it will display a link
-    with specific version so that this command can be used deterministicly in a build script.
-    It also displays binaries location if you prefer to install or download it yourself.
-.PARAMETER NoPath
-    By default this script will set environment variable PATH for the current process to the binaries folder inside installation folder.
-    If set it will display binaries location but not set any environment variable.
-.PARAMETER Verbose
-    Displays diagnostics information.
-.PARAMETER AzureFeed
-    Default: https://dotnetcli.azureedge.net/dotnet
-    This parameter typically is not changed by the user.
-    It allows changing the URL for the Azure feed used by this installer.
-.PARAMETER UncachedFeed
-    This parameter typically is not changed by the user.
-    It allows changing the URL for the Uncached feed used by this installer.
-.PARAMETER FeedCredential
-    Used as a query string to append to the Azure feed.
-    It allows changing the URL to use non-public blob storage accounts.
-.PARAMETER ProxyAddress
-    If set, the installer will use the proxy when making web requests
-.PARAMETER ProxyUseDefaultCredentials
-    Default: false
-    Use default credentials, when using proxy address.
-.PARAMETER SkipNonVersionedFiles
-    Default: false
-    Skips installing non-versioned files if they already exist, such as dotnet.exe.
-.PARAMETER NoCdn
-    Disable downloading from the Azure CDN, and use the uncached feed directly.
-.PARAMETER JSonFile
-    Determines the SDK version from a user specified global.json file
-    Note: global.json must have a value for 'SDK:Version'
-#>
-[cmdletbinding()]
-param(
-   [string]$Channel="LTS",
-   [string]$Version="Latest",
-   [string]$JSonFile,
-   [string]$InstallDir="<auto>",
-   [string]$Architecture="<auto>",
-   [ValidateSet("dotnet", "aspnetcore", "windowsdesktop", IgnoreCase = $false)]
-   [string]$Runtime,
-   [Obsolete("This parameter may be removed in a future version of this script. The recommended alternative is '-Runtime dotnet'.")]
-   [switch]$SharedRuntime,
-   [switch]$DryRun,
-   [switch]$NoPath,
-   [string]$AzureFeed="https://dotnetcli.azureedge.net/dotnet",
-   [string]$UncachedFeed="https://dotnetcli.blob.core.windows.net/dotnet",
-   [string]$FeedCredential,
-   [string]$ProxyAddress,
-   [switch]$ProxyUseDefaultCredentials,
-   [switch]$SkipNonVersionedFiles,
-   [switch]$NoCdn
-)
-
-Set-StrictMode -Version Latest
-$ErrorActionPreference="Stop"
-$ProgressPreference="SilentlyContinue"
-
-if ($NoCdn) {
-    $AzureFeed = $UncachedFeed
-}
-
-$BinFolderRelativePath=""
-
-if ($SharedRuntime -and (-not $Runtime)) {
-    $Runtime = "dotnet"
-}
-
-# example path with regex: shared/1.0.0-beta-12345/somepath
-$VersionRegEx="/\d+\.\d+[^/]+/"
-$OverrideNonVersionedFiles = !$SkipNonVersionedFiles
-
-function Say($str) {
-    Write-Host "dotnet-install: $str"
-}
-
-function Say-Verbose($str) {
-    Write-Verbose "dotnet-install: $str"
-}
-
-function Say-Invocation($Invocation) {
-    $command = $Invocation.MyCommand;
-    $args = (($Invocation.BoundParameters.Keys | foreach { "-$_ `"$($Invocation.BoundParameters[$_])`"" }) -join " ")
-    Say-Verbose "$command $args"
-}
-
-function Invoke-With-Retry([ScriptBlock]$ScriptBlock, [int]$MaxAttempts = 3, [int]$SecondsBetweenAttempts = 1) {
-    $Attempts = 0
-
-    while ($true) {
-        try {
-            return $ScriptBlock.Invoke()
-        }
-        catch {
-            $Attempts++
-            if ($Attempts -lt $MaxAttempts) {
-                Start-Sleep $SecondsBetweenAttempts
-            }
-            else {
-                throw
-            }
-        }
-    }
-}
-
-function Get-Machine-Architecture() {
-    Say-Invocation $MyInvocation
-
-    # possible values: amd64, x64, x86, arm64, arm
-    return $ENV:PROCESSOR_ARCHITECTURE
-}
-
-function Get-CLIArchitecture-From-Architecture([string]$Architecture) {
-    Say-Invocation $MyInvocation
-
-    switch ($Architecture.ToLower()) {
-        { $_ -eq "<auto>" } { return Get-CLIArchitecture-From-Architecture $(Get-Machine-Architecture) }
-        { ($_ -eq "amd64") -or ($_ -eq "x64") } { return "x64" }
-        { $_ -eq "x86" } { return "x86" }
-        { $_ -eq "arm" } { return "arm" }
-        { $_ -eq "arm64" } { return "arm64" }
-        default { throw "Architecture not supported. If you think this is a bug, report it at https://github.com/dotnet/sdk/issues" }
-    }
-}
-
-# The version text returned from the feeds is a 1-line or 2-line string:
-# For the SDK and the dotnet runtime (2 lines):
-# Line 1: # commit_hash
-# Line 2: # 4-part version
-# For the aspnetcore runtime (1 line):
-# Line 1: # 4-part version
-function Get-Version-Info-From-Version-Text([string]$VersionText) {
-    Say-Invocation $MyInvocation
-
-    $Data = -split $VersionText
-
-    $VersionInfo = @{
-        CommitHash = $(if ($Data.Count -gt 1) { $Data[0] })
-        Version = $Data[-1] # last line is always the version number.
-    }
-    return $VersionInfo
-}
-
-function Load-Assembly([string] $Assembly) {
-    try {
-        Add-Type -Assembly $Assembly | Out-Null
-    }
-    catch {
-        # On Nano Server, Powershell Core Edition is used.  Add-Type is unable to resolve base class assemblies because they are not GAC'd.
-        # Loading the base class assemblies is not unnecessary as the types will automatically get resolved.
-    }
-}
-
-function GetHTTPResponse([Uri] $Uri)
-{
-    Invoke-With-Retry(
-    {
-
-        $HttpClient = $null
-
-        try {
-            # HttpClient is used vs Invoke-WebRequest in order to support Nano Server which doesn't support the Invoke-WebRequest cmdlet.
-            Load-Assembly -Assembly System.Net.Http
-
-            if(-not $ProxyAddress) {
-                try {
-                    # Despite no proxy being explicitly specified, we may still be behind a default proxy
-                    $DefaultProxy = [System.Net.WebRequest]::DefaultWebProxy;
-                    if($DefaultProxy -and (-not $DefaultProxy.IsBypassed($Uri))) {
-                        $ProxyAddress = $DefaultProxy.GetProxy($Uri).OriginalString
-                        $ProxyUseDefaultCredentials = $true
-                    }
-                } catch {
-                    # Eat the exception and move forward as the above code is an attempt
-                    #    at resolving the DefaultProxy that may not have been a problem.
-                    $ProxyAddress = $null
-                    Say-Verbose("Exception ignored: $_.Exception.Message - moving forward...")
-                }
-            }
-
-            if($ProxyAddress) {
-                $HttpClientHandler = New-Object System.Net.Http.HttpClientHandler
-                $HttpClientHandler.Proxy =  New-Object System.Net.WebProxy -Property @{Address=$ProxyAddress;UseDefaultCredentials=$ProxyUseDefaultCredentials}
-                $HttpClient = New-Object System.Net.Http.HttpClient -ArgumentList $HttpClientHandler
-            }
-            else {
-
-                $HttpClient = New-Object System.Net.Http.HttpClient
-            }
-            # Default timeout for HttpClient is 100s.  For a 50 MB download this assumes 500 KB/s average, any less will time out
-            # 20 minutes allows it to work over much slower connections.
-            $HttpClient.Timeout = New-TimeSpan -Minutes 20
-            $Response = $HttpClient.GetAsync("${Uri}${FeedCredential}").Result
-            if (($Response -eq $null) -or (-not ($Response.IsSuccessStatusCode))) {
-                 # The feed credential is potentially sensitive info. Do not log FeedCredential to console output.
-                $ErrorMsg = "Failed to download $Uri."
-                if ($Response -ne $null) {
-                    $ErrorMsg += "  $Response"
-                }
-
-                throw $ErrorMsg
-            }
-
-             return $Response
-        }
-        finally {
-             if ($HttpClient -ne $null) {
-                $HttpClient.Dispose()
-            }
-        }
-    })
-}
-
-function Get-Latest-Version-Info([string]$AzureFeed, [string]$Channel, [bool]$Coherent) {
-    Say-Invocation $MyInvocation
-
-    $VersionFileUrl = $null
-    if ($Runtime -eq "dotnet") {
-        $VersionFileUrl = "$UncachedFeed/Runtime/$Channel/latest.version"
-    }
-    elseif ($Runtime -eq "aspnetcore") {
-        $VersionFileUrl = "$UncachedFeed/aspnetcore/Runtime/$Channel/latest.version"
-    }
-    # Currently, the WindowsDesktop runtime is manufactured with the .Net core runtime
-    elseif ($Runtime -eq "windowsdesktop") {
-        $VersionFileUrl = "$UncachedFeed/Runtime/$Channel/latest.version"
-    }
-    elseif (-not $Runtime) {
-        if ($Coherent) {
-            $VersionFileUrl = "$UncachedFeed/Sdk/$Channel/latest.coherent.version"
-        }
-        else {
-            $VersionFileUrl = "$UncachedFeed/Sdk/$Channel/latest.version"
-        }
-    }
-    else {
-        throw "Invalid value for `$Runtime"
-    }
-    try {
-        $Response = GetHTTPResponse -Uri $VersionFileUrl
-    }
-    catch {
-        throw "Could not resolve version information."
-    }
-    $StringContent = $Response.Content.ReadAsStringAsync().Result
-
-    switch ($Response.Content.Headers.ContentType) {
-        { ($_ -eq "application/octet-stream") } { $VersionText = $StringContent }
-        { ($_ -eq "text/plain") } { $VersionText = $StringContent }
-        { ($_ -eq "text/plain; charset=UTF-8") } { $VersionText = $StringContent }
-        default { throw "``$Response.Content.Headers.ContentType`` is an unknown .version file content type." }
-    }
-
-    $VersionInfo = Get-Version-Info-From-Version-Text $VersionText
-
-    return $VersionInfo
-}
-
-function Parse-Jsonfile-For-Version([string]$JSonFile) {
-    Say-Invocation $MyInvocation
-
-    If (-Not (Test-Path $JSonFile)) {
-        throw "Unable to find '$JSonFile'"
-    }
-    try {
-        $JSonContent = Get-Content($JSonFile) -Raw | ConvertFrom-Json | Select-Object -expand "sdk" -ErrorAction SilentlyContinue
-    }
-    catch {
-        throw "Json file unreadable: '$JSonFile'"
-    }
-    if ($JSonContent) {
-        try {
-            $JSonContent.PSObject.Properties | ForEach-Object {
-                $PropertyName = $_.Name
-                if ($PropertyName -eq "version") {
-                    $Version = $_.Value
-                    Say-Verbose "Version = $Version"
-                }
-            }
-        }
-        catch {
-            throw "Unable to parse the SDK node in '$JSonFile'"
-        }
-    }
-    else {
-        throw "Unable to find the SDK node in '$JSonFile'"
-    }
-    If ($Version -eq $null) {
-        throw "Unable to find the SDK:version node in '$JSonFile'"
-    }
-    return $Version
-}
-
-function Get-Specific-Version-From-Version([string]$AzureFeed, [string]$Channel, [string]$Version, [string]$JSonFile) {
-    Say-Invocation $MyInvocation
-
-    if (-not $JSonFile) {
-        switch ($Version.ToLower()) {
-            { $_ -eq "latest" } {
-                $LatestVersionInfo = Get-Latest-Version-Info -AzureFeed $AzureFeed -Channel $Channel -Coherent $False
-                return $LatestVersionInfo.Version
-            }
-            { $_ -eq "coherent" } {
-                $LatestVersionInfo = Get-Latest-Version-Info -AzureFeed $AzureFeed -Channel $Channel -Coherent $True
-                return $LatestVersionInfo.Version
-            }
-            default { return $Version }
-        }
-    }
-    else {
-        return Parse-Jsonfile-For-Version $JSonFile
-    }
-}
-
-function Get-Download-Link([string]$AzureFeed, [string]$SpecificVersion, [string]$CLIArchitecture) {
-    Say-Invocation $MyInvocation
-
-    if ($Runtime -eq "dotnet") {
-        $PayloadURL = "$AzureFeed/Runtime/$SpecificVersion/dotnet-runtime-$SpecificVersion-win-$CLIArchitecture.zip"
-    }
-    elseif ($Runtime -eq "aspnetcore") {
-        $PayloadURL = "$AzureFeed/aspnetcore/Runtime/$SpecificVersion/aspnetcore-runtime-$SpecificVersion-win-$CLIArchitecture.zip"
-    }
-    elseif ($Runtime -eq "windowsdesktop") {
-        $PayloadURL = "$AzureFeed/Runtime/$SpecificVersion/windowsdesktop-runtime-$SpecificVersion-win-$CLIArchitecture.zip"
-    }
-    elseif (-not $Runtime) {
-        $PayloadURL = "$AzureFeed/Sdk/$SpecificVersion/dotnet-sdk-$SpecificVersion-win-$CLIArchitecture.zip"
-    }
-    else {
-        throw "Invalid value for `$Runtime"
-    }
-
-    Say-Verbose "Constructed primary named payload URL: $PayloadURL"
-
-    return $PayloadURL
-}
-
-function Get-LegacyDownload-Link([string]$AzureFeed, [string]$SpecificVersion, [string]$CLIArchitecture) {
-    Say-Invocation $MyInvocation
-
-    if (-not $Runtime) {
-        $PayloadURL = "$AzureFeed/Sdk/$SpecificVersion/dotnet-dev-win-$CLIArchitecture.$SpecificVersion.zip"
-    }
-    elseif ($Runtime -eq "dotnet") {
-        $PayloadURL = "$AzureFeed/Runtime/$SpecificVersion/dotnet-win-$CLIArchitecture.$SpecificVersion.zip"
-    }
-    else {
-        return $null
-    }
-
-    Say-Verbose "Constructed legacy named payload URL: $PayloadURL"
-
-    return $PayloadURL
-}
-
-function Get-User-Share-Path() {
-    Say-Invocation $MyInvocation
-
-    $InstallRoot = $env:DOTNET_INSTALL_DIR
-    if (!$InstallRoot) {
-        $InstallRoot = "$env:LocalAppData\Microsoft\dotnet"
-    }
-    return $InstallRoot
-}
-
-function Resolve-Installation-Path([string]$InstallDir) {
-    Say-Invocation $MyInvocation
-
-    if ($InstallDir -eq "<auto>") {
-        return Get-User-Share-Path
-    }
-    return $InstallDir
-}
-
-function Is-Dotnet-Package-Installed([string]$InstallRoot, [string]$RelativePathToPackage, [string]$SpecificVersion) {
-    Say-Invocation $MyInvocation
-
-    $DotnetPackagePath = Join-Path -Path $InstallRoot -ChildPath $RelativePathToPackage | Join-Path -ChildPath $SpecificVersion
-    Say-Verbose "Is-Dotnet-Package-Installed: DotnetPackagePath=$DotnetPackagePath"
-    return Test-Path $DotnetPackagePath -PathType Container
-}
-
-function Get-Absolute-Path([string]$RelativeOrAbsolutePath) {
-    # Too much spam
-    # Say-Invocation $MyInvocation
-
-    return $ExecutionContext.SessionState.Path.GetUnresolvedProviderPathFromPSPath($RelativeOrAbsolutePath)
-}
-
-function Get-Path-Prefix-With-Version($path) {
-    $match = [regex]::match($path, $VersionRegEx)
-    if ($match.Success) {
-        return $entry.FullName.Substring(0, $match.Index + $match.Length)
-    }
-
-    return $null
-}
-
-function Get-List-Of-Directories-And-Versions-To-Unpack-From-Dotnet-Package([System.IO.Compression.ZipArchive]$Zip, [string]$OutPath) {
-    Say-Invocation $MyInvocation
-
-    $ret = @()
-    foreach ($entry in $Zip.Entries) {
-        $dir = Get-Path-Prefix-With-Version $entry.FullName
-        if ($dir -ne $null) {
-            $path = Get-Absolute-Path $(Join-Path -Path $OutPath -ChildPath $dir)
-            if (-Not (Test-Path $path -PathType Container)) {
-                $ret += $dir
-            }
-        }
-    }
-
-    $ret = $ret | Sort-Object | Get-Unique
-
-    $values = ($ret | foreach { "$_" }) -join ";"
-    Say-Verbose "Directories to unpack: $values"
-
-    return $ret
-}
-
-# Example zip content and extraction algorithm:
-# Rule: files if extracted are always being extracted to the same relative path locally
-# .\
-#       a.exe   # file does not exist locally, extract
-#       b.dll   # file exists locally, override only if $OverrideFiles set
-#       aaa\    # same rules as for files
-#           ...
-#       abc\1.0.0\  # directory contains version and exists locally
-#           ...     # do not extract content under versioned part
-#       abc\asd\    # same rules as for files
-#            ...
-#       def\ghi\1.0.1\  # directory contains version and does not exist locally
-#           ...         # extract content
-function Extract-Dotnet-Package([string]$ZipPath, [string]$OutPath) {
-    Say-Invocation $MyInvocation
-
-    Load-Assembly -Assembly System.IO.Compression.FileSystem
-    Set-Variable -Name Zip
-    try {
-        $Zip = [System.IO.Compression.ZipFile]::OpenRead($ZipPath)
-
-        $DirectoriesToUnpack = Get-List-Of-Directories-And-Versions-To-Unpack-From-Dotnet-Package -Zip $Zip -OutPath $OutPath
-
-        foreach ($entry in $Zip.Entries) {
-            $PathWithVersion = Get-Path-Prefix-With-Version $entry.FullName
-            if (($PathWithVersion -eq $null) -Or ($DirectoriesToUnpack -contains $PathWithVersion)) {
-                $DestinationPath = Get-Absolute-Path $(Join-Path -Path $OutPath -ChildPath $entry.FullName)
-                $DestinationDir = Split-Path -Parent $DestinationPath
-                $OverrideFiles=$OverrideNonVersionedFiles -Or (-Not (Test-Path $DestinationPath))
-                if ((-Not $DestinationPath.EndsWith("\")) -And $OverrideFiles) {
-                    New-Item -ItemType Directory -Force -Path $DestinationDir | Out-Null
-                    [System.IO.Compression.ZipFileExtensions]::ExtractToFile($entry, $DestinationPath, $OverrideNonVersionedFiles)
-                }
-            }
-        }
-    }
-    finally {
-        if ($Zip -ne $null) {
-            $Zip.Dispose()
-        }
-    }
-}
-
-function DownloadFile($Source, [string]$OutPath) {
-    if ($Source -notlike "http*") {
-        #  Using System.IO.Path.GetFullPath to get the current directory
-        #    does not work in this context - $pwd gives the current directory
-        if (![System.IO.Path]::IsPathRooted($Source)) {
-            $Source = $(Join-Path -Path $pwd -ChildPath $Source)
-        }
-        $Source = Get-Absolute-Path $Source
-        Say "Copying file from $Source to $OutPath"
-        Copy-Item $Source $OutPath
-        return
-    }
-
-    $Stream = $null
-
-    try {
-        $Response = GetHTTPResponse -Uri $Source
-        $Stream = $Response.Content.ReadAsStreamAsync().Result
-        $File = [System.IO.File]::Create($OutPath)
-        $Stream.CopyTo($File)
-        $File.Close()
-    }
-    finally {
-        if ($Stream -ne $null) {
-            $Stream.Dispose()
-        }
-    }
-}
-
-function Prepend-Sdk-InstallRoot-To-Path([string]$InstallRoot, [string]$BinFolderRelativePath) {
-    $BinPath = Get-Absolute-Path $(Join-Path -Path $InstallRoot -ChildPath $BinFolderRelativePath)
-    if (-Not $NoPath) {
-        $SuffixedBinPath = "$BinPath;"
-        if (-Not $env:path.Contains($SuffixedBinPath)) {
-            Say "Adding to current process PATH: `"$BinPath`". Note: This change will not be visible if PowerShell was run as a child process."
-            $env:path = $SuffixedBinPath + $env:path
-        } else {
-            Say-Verbose "Current process PATH already contains `"$BinPath`""
-        }
-    }
-    else {
-        Say "Binaries of dotnet can be found in $BinPath"
-    }
-}
-
-$CLIArchitecture = Get-CLIArchitecture-From-Architecture $Architecture
-$SpecificVersion = Get-Specific-Version-From-Version -AzureFeed $AzureFeed -Channel $Channel -Version $Version -JSonFile $JSonFile
-$DownloadLink = Get-Download-Link -AzureFeed $AzureFeed -SpecificVersion $SpecificVersion -CLIArchitecture $CLIArchitecture
-$LegacyDownloadLink = Get-LegacyDownload-Link -AzureFeed $AzureFeed -SpecificVersion $SpecificVersion -CLIArchitecture $CLIArchitecture
-
-$InstallRoot = Resolve-Installation-Path $InstallDir
-Say-Verbose "InstallRoot: $InstallRoot"
-$ScriptName = $MyInvocation.MyCommand.Name
-
-if ($DryRun) {
-    Say "Payload URLs:"
-    Say "Primary named payload URL: $DownloadLink"
-    if ($LegacyDownloadLink) {
-        Say "Legacy named payload URL: $LegacyDownloadLink"
-    }
-    $RepeatableCommand = ".\$ScriptName -Version `"$SpecificVersion`" -InstallDir `"$InstallRoot`" -Architecture `"$CLIArchitecture`""
-    if ($Runtime -eq "dotnet") {
-       $RepeatableCommand+=" -Runtime `"dotnet`""
-    }
-    elseif ($Runtime -eq "aspnetcore") {
-       $RepeatableCommand+=" -Runtime `"aspnetcore`""
-    }
-    foreach ($key in $MyInvocation.BoundParameters.Keys) {
-        if (-not (@("Architecture","Channel","DryRun","InstallDir","Runtime","SharedRuntime","Version") -contains $key)) {
-            $RepeatableCommand+=" -$key `"$($MyInvocation.BoundParameters[$key])`""
-        }
-    }
-    Say "Repeatable invocation: $RepeatableCommand"
-    exit 0
-}
-
-if ($Runtime -eq "dotnet") {
-    $assetName = ".NET Core Runtime"
-    $dotnetPackageRelativePath = "shared\Microsoft.NETCore.App"
-}
-elseif ($Runtime -eq "aspnetcore") {
-    $assetName = "ASP.NET Core Runtime"
-    $dotnetPackageRelativePath = "shared\Microsoft.AspNetCore.App"
-}
-elseif ($Runtime -eq "windowsdesktop") {
-    $assetName = ".NET Core Windows Desktop Runtime"
-    $dotnetPackageRelativePath = "shared\Microsoft.WindowsDesktop.App"
-}
-elseif (-not $Runtime) {
-    $assetName = ".NET Core SDK"
-    $dotnetPackageRelativePath = "sdk"
-}
-else {
-    throw "Invalid value for `$Runtime"
-}
-
-#  Check if the SDK version is already installed.
-$isAssetInstalled = Is-Dotnet-Package-Installed -InstallRoot $InstallRoot -RelativePathToPackage $dotnetPackageRelativePath -SpecificVersion $SpecificVersion
-if ($isAssetInstalled) {
-    Say "$assetName version $SpecificVersion is already installed."
-    Prepend-Sdk-InstallRoot-To-Path -InstallRoot $InstallRoot -BinFolderRelativePath $BinFolderRelativePath
-    exit 0
-}
-
-New-Item -ItemType Directory -Force -Path $InstallRoot | Out-Null
-
-$installDrive = $((Get-Item $InstallRoot).PSDrive.Name);
-$diskInfo = Get-PSDrive -Name $installDrive
-if ($diskInfo.Free / 1MB -le 100) {
-    Say "There is not enough disk space on drive ${installDrive}:"
-    exit 0
-}
-
-$ZipPath = [System.IO.Path]::combine([System.IO.Path]::GetTempPath(), [System.IO.Path]::GetRandomFileName())
-Say-Verbose "Zip path: $ZipPath"
-
-$DownloadFailed = $false
-Say "Downloading link: $DownloadLink"
-try {
-    DownloadFile -Source $DownloadLink -OutPath $ZipPath
-}
-catch {
-    Say "Cannot download: $DownloadLink"
-    if ($LegacyDownloadLink) {
-        $DownloadLink = $LegacyDownloadLink
-        $ZipPath = [System.IO.Path]::combine([System.IO.Path]::GetTempPath(), [System.IO.Path]::GetRandomFileName())
-        Say-Verbose "Legacy zip path: $ZipPath"
-        Say "Downloading legacy link: $DownloadLink"
-        try {
-            DownloadFile -Source $DownloadLink -OutPath $ZipPath
-        }
-        catch {
-            Say "Cannot download: $DownloadLink"
-            $DownloadFailed = $true
-        }
-    }
-    else {
-        $DownloadFailed = $true
-    }
-}
-
-if ($DownloadFailed) {
-    throw "Could not find/download: `"$assetName`" with version = $SpecificVersion`nRefer to: https://aka.ms/dotnet-os-lifecycle for information on .NET Core support"
-}
-
-Say "Extracting zip from $DownloadLink"
-Extract-Dotnet-Package -ZipPath $ZipPath -OutPath $InstallRoot
-
-#  Check if the SDK version is installed; if not, fail the installation.
-$isAssetInstalled = $false
-
-# if the version contains "RTM" or "servicing"; check if a 'release-type' SDK version is installed.
-if ($SpecificVersion -Match "rtm" -or $SpecificVersion -Match "servicing") {
-    $ReleaseVersion = $SpecificVersion.Split("-")[0]
-    Say-Verbose "Checking installation: version = $ReleaseVersion"
-    $isAssetInstalled = Is-Dotnet-Package-Installed -InstallRoot $InstallRoot -RelativePathToPackage $dotnetPackageRelativePath -SpecificVersion $ReleaseVersion
-}
-
-#  Check if the SDK version is installed.
-if (!$isAssetInstalled) {
-    Say-Verbose "Checking installation: version = $SpecificVersion"
-    $isAssetInstalled = Is-Dotnet-Package-Installed -InstallRoot $InstallRoot -RelativePathToPackage $dotnetPackageRelativePath -SpecificVersion $SpecificVersion
-}
-
-if (!$isAssetInstalled) {
-    throw "`"$assetName`" with version = $SpecificVersion failed to install with an unknown error."
-}
-
-Remove-Item $ZipPath
-
-Prepend-Sdk-InstallRoot-To-Path -InstallRoot $InstallRoot -BinFolderRelativePath $BinFolderRelativePath
-
-Say "Installation finished"
-exit 0
+#
+# 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
+    Installs dotnet cli
+.DESCRIPTION
+    Installs dotnet cli. If dotnet installation already exists in the given directory
+    it will update it only if the requested version differs from the one already installed.
+.PARAMETER Channel
+    Default: LTS
+    Download from the Channel specified. Possible values:
+    - Current - most current release
+    - LTS - most current supported release
+    - 2-part version in a format A.B - represents a specific release
+          examples: 2.0, 1.0
+    - Branch name
+          examples: release/2.0.0, Master
+    Note: The version parameter overrides the channel parameter.
+.PARAMETER Version
+    Default: latest
+    Represents a build version on specific channel. Possible values:
+    - latest - most latest build on specific channel
+    - coherent - most latest coherent build on specific channel
+          coherent applies only to SDK downloads
+    - 3-part version in a format A.B.C - represents specific version of build
+          examples: 2.0.0-preview2-006120, 1.1.0
+.PARAMETER InstallDir
+    Default: %LocalAppData%\Microsoft\dotnet
+    Path to where to install dotnet. Note that binaries will be placed directly in a given directory.
+.PARAMETER Architecture
+    Default: <auto> - this value represents currently running OS architecture
+    Architecture of dotnet binaries to be installed.
+    Possible values are: <auto>, amd64, x64, x86, arm64, arm
+.PARAMETER SharedRuntime
+    This parameter is obsolete and may be removed in a future version of this script.
+    The recommended alternative is '-Runtime dotnet'.
+    Installs just the shared runtime bits, not the entire SDK.
+.PARAMETER Runtime
+    Installs just a shared runtime, not the entire SDK.
+    Possible values:
+        - dotnet     - the Microsoft.NETCore.App shared runtime
+        - aspnetcore - the Microsoft.AspNetCore.App shared runtime
+        - windowsdesktop - the Microsoft.WindowsDesktop.App shared runtime
+.PARAMETER DryRun
+    If set it will not perform installation but instead display what command line to use to consistently install
+    currently requested version of dotnet cli. In example if you specify version 'latest' it will display a link
+    with specific version so that this command can be used deterministicly in a build script.
+    It also displays binaries location if you prefer to install or download it yourself.
+.PARAMETER NoPath
+    By default this script will set environment variable PATH for the current process to the binaries folder inside installation folder.
+    If set it will display binaries location but not set any environment variable.
+.PARAMETER Verbose
+    Displays diagnostics information.
+.PARAMETER AzureFeed
+    Default: https://dotnetcli.azureedge.net/dotnet
+    This parameter typically is not changed by the user.
+    It allows changing the URL for the Azure feed used by this installer.
+.PARAMETER UncachedFeed
+    This parameter typically is not changed by the user.
+    It allows changing the URL for the Uncached feed used by this installer.
+.PARAMETER FeedCredential
+    Used as a query string to append to the Azure feed.
+    It allows changing the URL to use non-public blob storage accounts.
+.PARAMETER ProxyAddress
+    If set, the installer will use the proxy when making web requests
+.PARAMETER ProxyUseDefaultCredentials
+    Default: false
+    Use default credentials, when using proxy address.
+.PARAMETER SkipNonVersionedFiles
+    Default: false
+    Skips installing non-versioned files if they already exist, such as dotnet.exe.
+.PARAMETER NoCdn
+    Disable downloading from the Azure CDN, and use the uncached feed directly.
+.PARAMETER JSonFile
+    Determines the SDK version from a user specified global.json file
+    Note: global.json must have a value for 'SDK:Version'
+#>
+[cmdletbinding()]
+param(
+   [string]$Channel="LTS",
+   [string]$Version="Latest",
+   [string]$JSonFile,
+   [string]$InstallDir="<auto>",
+   [string]$Architecture="<auto>",
+   [ValidateSet("dotnet", "aspnetcore", "windowsdesktop", IgnoreCase = $false)]
+   [string]$Runtime,
+   [Obsolete("This parameter may be removed in a future version of this script. The recommended alternative is '-Runtime dotnet'.")]
+   [switch]$SharedRuntime,
+   [switch]$DryRun,
+   [switch]$NoPath,
+   [string]$AzureFeed="https://dotnetcli.azureedge.net/dotnet",
+   [string]$UncachedFeed="https://dotnetcli.blob.core.windows.net/dotnet",
+   [string]$FeedCredential,
+   [string]$ProxyAddress,
+   [switch]$ProxyUseDefaultCredentials,
+   [switch]$SkipNonVersionedFiles,
+   [switch]$NoCdn
+)
+
+Set-StrictMode -Version Latest
+$ErrorActionPreference="Stop"
+$ProgressPreference="SilentlyContinue"
+
+if ($NoCdn) {
+    $AzureFeed = $UncachedFeed
+}
+
+$BinFolderRelativePath=""
+
+if ($SharedRuntime -and (-not $Runtime)) {
+    $Runtime = "dotnet"
+}
+
+# example path with regex: shared/1.0.0-beta-12345/somepath
+$VersionRegEx="/\d+\.\d+[^/]+/"
+$OverrideNonVersionedFiles = !$SkipNonVersionedFiles
+
+function Say($str) {
+    Write-Host "dotnet-install: $str"
+}
+
+function Say-Verbose($str) {
+    Write-Verbose "dotnet-install: $str"
+}
+
+function Say-Invocation($Invocation) {
+    $command = $Invocation.MyCommand;
+    $args = (($Invocation.BoundParameters.Keys | foreach { "-$_ `"$($Invocation.BoundParameters[$_])`"" }) -join " ")
+    Say-Verbose "$command $args"
+}
+
+function Invoke-With-Retry([ScriptBlock]$ScriptBlock, [int]$MaxAttempts = 3, [int]$SecondsBetweenAttempts = 1) {
+    $Attempts = 0
+
+    while ($true) {
+        try {
+            return $ScriptBlock.Invoke()
+        }
+        catch {
+            $Attempts++
+            if ($Attempts -lt $MaxAttempts) {
+                Start-Sleep $SecondsBetweenAttempts
+            }
+            else {
+                throw
+            }
+        }
+    }
+}
+
+function Get-Machine-Architecture() {
+    Say-Invocation $MyInvocation
+
+    # possible values: amd64, x64, x86, arm64, arm
+    return $ENV:PROCESSOR_ARCHITECTURE
+}
+
+function Get-CLIArchitecture-From-Architecture([string]$Architecture) {
+    Say-Invocation $MyInvocation
+
+    switch ($Architecture.ToLower()) {
+        { $_ -eq "<auto>" } { return Get-CLIArchitecture-From-Architecture $(Get-Machine-Architecture) }
+        { ($_ -eq "amd64") -or ($_ -eq "x64") } { return "x64" }
+        { $_ -eq "x86" } { return "x86" }
+        { $_ -eq "arm" } { return "arm" }
+        { $_ -eq "arm64" } { return "arm64" }
+        default { throw "Architecture not supported. If you think this is a bug, report it at https://github.com/dotnet/sdk/issues" }
+    }
+}
+
+# The version text returned from the feeds is a 1-line or 2-line string:
+# For the SDK and the dotnet runtime (2 lines):
+# Line 1: # commit_hash
+# Line 2: # 4-part version
+# For the aspnetcore runtime (1 line):
+# Line 1: # 4-part version
+function Get-Version-Info-From-Version-Text([string]$VersionText) {
+    Say-Invocation $MyInvocation
+
+    $Data = -split $VersionText
+
+    $VersionInfo = @{
+        CommitHash = $(if ($Data.Count -gt 1) { $Data[0] })
+        Version = $Data[-1] # last line is always the version number.
+    }
+    return $VersionInfo
+}
+
+function Load-Assembly([string] $Assembly) {
+    try {
+        Add-Type -Assembly $Assembly | Out-Null
+    }
+    catch {
+        # On Nano Server, Powershell Core Edition is used.  Add-Type is unable to resolve base class assemblies because they are not GAC'd.
+        # Loading the base class assemblies is not unnecessary as the types will automatically get resolved.
+    }
+}
+
+function GetHTTPResponse([Uri] $Uri)
+{
+    Invoke-With-Retry(
+    {
+
+        $HttpClient = $null
+
+        try {
+            # HttpClient is used vs Invoke-WebRequest in order to support Nano Server which doesn't support the Invoke-WebRequest cmdlet.
+            Load-Assembly -Assembly System.Net.Http
+
+            if(-not $ProxyAddress) {
+                try {
+                    # Despite no proxy being explicitly specified, we may still be behind a default proxy
+                    $DefaultProxy = [System.Net.WebRequest]::DefaultWebProxy;
+                    if($DefaultProxy -and (-not $DefaultProxy.IsBypassed($Uri))) {
+                        $ProxyAddress = $DefaultProxy.GetProxy($Uri).OriginalString
+                        $ProxyUseDefaultCredentials = $true
+                    }
+                } catch {
+                    # Eat the exception and move forward as the above code is an attempt
+                    #    at resolving the DefaultProxy that may not have been a problem.
+                    $ProxyAddress = $null
+                    Say-Verbose("Exception ignored: $_.Exception.Message - moving forward...")
+                }
+            }
+
+            if($ProxyAddress) {
+                $HttpClientHandler = New-Object System.Net.Http.HttpClientHandler
+                $HttpClientHandler.Proxy =  New-Object System.Net.WebProxy -Property @{Address=$ProxyAddress;UseDefaultCredentials=$ProxyUseDefaultCredentials}
+                $HttpClient = New-Object System.Net.Http.HttpClient -ArgumentList $HttpClientHandler
+            }
+            else {
+
+                $HttpClient = New-Object System.Net.Http.HttpClient
+            }
+            # Default timeout for HttpClient is 100s.  For a 50 MB download this assumes 500 KB/s average, any less will time out
+            # 20 minutes allows it to work over much slower connections.
+            $HttpClient.Timeout = New-TimeSpan -Minutes 20
+            $Response = $HttpClient.GetAsync("${Uri}${FeedCredential}").Result
+            if (($Response -eq $null) -or (-not ($Response.IsSuccessStatusCode))) {
+                 # The feed credential is potentially sensitive info. Do not log FeedCredential to console output.
+                $ErrorMsg = "Failed to download $Uri."
+                if ($Response -ne $null) {
+                    $ErrorMsg += "  $Response"
+                }
+
+                throw $ErrorMsg
+            }
+
+             return $Response
+        }
+        finally {
+             if ($HttpClient -ne $null) {
+                $HttpClient.Dispose()
+            }
+        }
+    })
+}
+
+function Get-Latest-Version-Info([string]$AzureFeed, [string]$Channel, [bool]$Coherent) {
+    Say-Invocation $MyInvocation
+
+    $VersionFileUrl = $null
+    if ($Runtime -eq "dotnet") {
+        $VersionFileUrl = "$UncachedFeed/Runtime/$Channel/latest.version"
+    }
+    elseif ($Runtime -eq "aspnetcore") {
+        $VersionFileUrl = "$UncachedFeed/aspnetcore/Runtime/$Channel/latest.version"
+    }
+    # Currently, the WindowsDesktop runtime is manufactured with the .Net core runtime
+    elseif ($Runtime -eq "windowsdesktop") {
+        $VersionFileUrl = "$UncachedFeed/Runtime/$Channel/latest.version"
+    }
+    elseif (-not $Runtime) {
+        if ($Coherent) {
+            $VersionFileUrl = "$UncachedFeed/Sdk/$Channel/latest.coherent.version"
+        }
+        else {
+            $VersionFileUrl = "$UncachedFeed/Sdk/$Channel/latest.version"
+        }
+    }
+    else {
+        throw "Invalid value for `$Runtime"
+    }
+    try {
+        $Response = GetHTTPResponse -Uri $VersionFileUrl
+    }
+    catch {
+        throw "Could not resolve version information."
+    }
+    $StringContent = $Response.Content.ReadAsStringAsync().Result
+
+    switch ($Response.Content.Headers.ContentType) {
+        { ($_ -eq "application/octet-stream") } { $VersionText = $StringContent }
+        { ($_ -eq "text/plain") } { $VersionText = $StringContent }
+        { ($_ -eq "text/plain; charset=UTF-8") } { $VersionText = $StringContent }
+        default { throw "``$Response.Content.Headers.ContentType`` is an unknown .version file content type." }
+    }
+
+    $VersionInfo = Get-Version-Info-From-Version-Text $VersionText
+
+    return $VersionInfo
+}
+
+function Parse-Jsonfile-For-Version([string]$JSonFile) {
+    Say-Invocation $MyInvocation
+
+    If (-Not (Test-Path $JSonFile)) {
+        throw "Unable to find '$JSonFile'"
+    }
+    try {
+        $JSonContent = Get-Content($JSonFile) -Raw | ConvertFrom-Json | Select-Object -expand "sdk" -ErrorAction SilentlyContinue
+    }
+    catch {
+        throw "Json file unreadable: '$JSonFile'"
+    }
+    if ($JSonContent) {
+        try {
+            $JSonContent.PSObject.Properties | ForEach-Object {
+                $PropertyName = $_.Name
+                if ($PropertyName -eq "version") {
+                    $Version = $_.Value
+                    Say-Verbose "Version = $Version"
+                }
+            }
+        }
+        catch {
+            throw "Unable to parse the SDK node in '$JSonFile'"
+        }
+    }
+    else {
+        throw "Unable to find the SDK node in '$JSonFile'"
+    }
+    If ($Version -eq $null) {
+        throw "Unable to find the SDK:version node in '$JSonFile'"
+    }
+    return $Version
+}
+
+function Get-Specific-Version-From-Version([string]$AzureFeed, [string]$Channel, [string]$Version, [string]$JSonFile) {
+    Say-Invocation $MyInvocation
+
+    if (-not $JSonFile) {
+        switch ($Version.ToLower()) {
+            { $_ -eq "latest" } {
+                $LatestVersionInfo = Get-Latest-Version-Info -AzureFeed $AzureFeed -Channel $Channel -Coherent $False
+                return $LatestVersionInfo.Version
+            }
+            { $_ -eq "coherent" } {
+                $LatestVersionInfo = Get-Latest-Version-Info -AzureFeed $AzureFeed -Channel $Channel -Coherent $True
+                return $LatestVersionInfo.Version
+            }
+            default { return $Version }
+        }
+    }
+    else {
+        return Parse-Jsonfile-For-Version $JSonFile
+    }
+}
+
+function Get-Download-Link([string]$AzureFeed, [string]$SpecificVersion, [string]$CLIArchitecture) {
+    Say-Invocation $MyInvocation
+
+    if ($Runtime -eq "dotnet") {
+        $PayloadURL = "$AzureFeed/Runtime/$SpecificVersion/dotnet-runtime-$SpecificVersion-win-$CLIArchitecture.zip"
+    }
+    elseif ($Runtime -eq "aspnetcore") {
+        $PayloadURL = "$AzureFeed/aspnetcore/Runtime/$SpecificVersion/aspnetcore-runtime-$SpecificVersion-win-$CLIArchitecture.zip"
+    }
+    elseif ($Runtime -eq "windowsdesktop") {
+        $PayloadURL = "$AzureFeed/Runtime/$SpecificVersion/windowsdesktop-runtime-$SpecificVersion-win-$CLIArchitecture.zip"
+    }
+    elseif (-not $Runtime) {
+        $PayloadURL = "$AzureFeed/Sdk/$SpecificVersion/dotnet-sdk-$SpecificVersion-win-$CLIArchitecture.zip"
+    }
+    else {
+        throw "Invalid value for `$Runtime"
+    }
+
+    Say-Verbose "Constructed primary named payload URL: $PayloadURL"
+
+    return $PayloadURL
+}
+
+function Get-LegacyDownload-Link([string]$AzureFeed, [string]$SpecificVersion, [string]$CLIArchitecture) {
+    Say-Invocation $MyInvocation
+
+    if (-not $Runtime) {
+        $PayloadURL = "$AzureFeed/Sdk/$SpecificVersion/dotnet-dev-win-$CLIArchitecture.$SpecificVersion.zip"
+    }
+    elseif ($Runtime -eq "dotnet") {
+        $PayloadURL = "$AzureFeed/Runtime/$SpecificVersion/dotnet-win-$CLIArchitecture.$SpecificVersion.zip"
+    }
+    else {
+        return $null
+    }
+
+    Say-Verbose "Constructed legacy named payload URL: $PayloadURL"
+
+    return $PayloadURL
+}
+
+function Get-User-Share-Path() {
+    Say-Invocation $MyInvocation
+
+    $InstallRoot = $env:DOTNET_INSTALL_DIR
+    if (!$InstallRoot) {
+        $InstallRoot = "$env:LocalAppData\Microsoft\dotnet"
+    }
+    return $InstallRoot
+}
+
+function Resolve-Installation-Path([string]$InstallDir) {
+    Say-Invocation $MyInvocation
+
+    if ($InstallDir -eq "<auto>") {
+        return Get-User-Share-Path
+    }
+    return $InstallDir
+}
+
+function Is-Dotnet-Package-Installed([string]$InstallRoot, [string]$RelativePathToPackage, [string]$SpecificVersion) {
+    Say-Invocation $MyInvocation
+
+    $DotnetPackagePath = Join-Path -Path $InstallRoot -ChildPath $RelativePathToPackage | Join-Path -ChildPath $SpecificVersion
+    Say-Verbose "Is-Dotnet-Package-Installed: DotnetPackagePath=$DotnetPackagePath"
+    return Test-Path $DotnetPackagePath -PathType Container
+}
+
+function Get-Absolute-Path([string]$RelativeOrAbsolutePath) {
+    # Too much spam
+    # Say-Invocation $MyInvocation
+
+    return $ExecutionContext.SessionState.Path.GetUnresolvedProviderPathFromPSPath($RelativeOrAbsolutePath)
+}
+
+function Get-Path-Prefix-With-Version($path) {
+    $match = [regex]::match($path, $VersionRegEx)
+    if ($match.Success) {
+        return $entry.FullName.Substring(0, $match.Index + $match.Length)
+    }
+
+    return $null
+}
+
+function Get-List-Of-Directories-And-Versions-To-Unpack-From-Dotnet-Package([System.IO.Compression.ZipArchive]$Zip, [string]$OutPath) {
+    Say-Invocation $MyInvocation
+
+    $ret = @()
+    foreach ($entry in $Zip.Entries) {
+        $dir = Get-Path-Prefix-With-Version $entry.FullName
+        if ($dir -ne $null) {
+            $path = Get-Absolute-Path $(Join-Path -Path $OutPath -ChildPath $dir)
+            if (-Not (Test-Path $path -PathType Container)) {
+                $ret += $dir
+            }
+        }
+    }
+
+    $ret = $ret | Sort-Object | Get-Unique
+
+    $values = ($ret | foreach { "$_" }) -join ";"
+    Say-Verbose "Directories to unpack: $values"
+
+    return $ret
+}
+
+# Example zip content and extraction algorithm:
+# Rule: files if extracted are always being extracted to the same relative path locally
+# .\
+#       a.exe   # file does not exist locally, extract
+#       b.dll   # file exists locally, override only if $OverrideFiles set
+#       aaa\    # same rules as for files
+#           ...
+#       abc\1.0.0\  # directory contains version and exists locally
+#           ...     # do not extract content under versioned part
+#       abc\asd\    # same rules as for files
+#            ...
+#       def\ghi\1.0.1\  # directory contains version and does not exist locally
+#           ...         # extract content
+function Extract-Dotnet-Package([string]$ZipPath, [string]$OutPath) {
+    Say-Invocation $MyInvocation
+
+    Load-Assembly -Assembly System.IO.Compression.FileSystem
+    Set-Variable -Name Zip
+    try {
+        $Zip = [System.IO.Compression.ZipFile]::OpenRead($ZipPath)
+
+        $DirectoriesToUnpack = Get-List-Of-Directories-And-Versions-To-Unpack-From-Dotnet-Package -Zip $Zip -OutPath $OutPath
+
+        foreach ($entry in $Zip.Entries) {
+            $PathWithVersion = Get-Path-Prefix-With-Version $entry.FullName
+            if (($PathWithVersion -eq $null) -Or ($DirectoriesToUnpack -contains $PathWithVersion)) {
+                $DestinationPath = Get-Absolute-Path $(Join-Path -Path $OutPath -ChildPath $entry.FullName)
+                $DestinationDir = Split-Path -Parent $DestinationPath
+                $OverrideFiles=$OverrideNonVersionedFiles -Or (-Not (Test-Path $DestinationPath))
+                if ((-Not $DestinationPath.EndsWith("\")) -And $OverrideFiles) {
+                    New-Item -ItemType Directory -Force -Path $DestinationDir | Out-Null
+                    [System.IO.Compression.ZipFileExtensions]::ExtractToFile($entry, $DestinationPath, $OverrideNonVersionedFiles)
+                }
+            }
+        }
+    }
+    finally {
+        if ($Zip -ne $null) {
+            $Zip.Dispose()
+        }
+    }
+}
+
+function DownloadFile($Source, [string]$OutPath) {
+    if ($Source -notlike "http*") {
+        #  Using System.IO.Path.GetFullPath to get the current directory
+        #    does not work in this context - $pwd gives the current directory
+        if (![System.IO.Path]::IsPathRooted($Source)) {
+            $Source = $(Join-Path -Path $pwd -ChildPath $Source)
+        }
+        $Source = Get-Absolute-Path $Source
+        Say "Copying file from $Source to $OutPath"
+        Copy-Item $Source $OutPath
+        return
+    }
+
+    $Stream = $null
+
+    try {
+        $Response = GetHTTPResponse -Uri $Source
+        $Stream = $Response.Content.ReadAsStreamAsync().Result
+        $File = [System.IO.File]::Create($OutPath)
+        $Stream.CopyTo($File)
+        $File.Close()
+    }
+    finally {
+        if ($Stream -ne $null) {
+            $Stream.Dispose()
+        }
+    }
+}
+
+function Prepend-Sdk-InstallRoot-To-Path([string]$InstallRoot, [string]$BinFolderRelativePath) {
+    $BinPath = Get-Absolute-Path $(Join-Path -Path $InstallRoot -ChildPath $BinFolderRelativePath)
+    if (-Not $NoPath) {
+        $SuffixedBinPath = "$BinPath;"
+        if (-Not $env:path.Contains($SuffixedBinPath)) {
+            Say "Adding to current process PATH: `"$BinPath`". Note: This change will not be visible if PowerShell was run as a child process."
+            $env:path = $SuffixedBinPath + $env:path
+        } else {
+            Say-Verbose "Current process PATH already contains `"$BinPath`""
+        }
+    }
+    else {
+        Say "Binaries of dotnet can be found in $BinPath"
+    }
+}
+
+$CLIArchitecture = Get-CLIArchitecture-From-Architecture $Architecture
+$SpecificVersion = Get-Specific-Version-From-Version -AzureFeed $AzureFeed -Channel $Channel -Version $Version -JSonFile $JSonFile
+$DownloadLink = Get-Download-Link -AzureFeed $AzureFeed -SpecificVersion $SpecificVersion -CLIArchitecture $CLIArchitecture
+$LegacyDownloadLink = Get-LegacyDownload-Link -AzureFeed $AzureFeed -SpecificVersion $SpecificVersion -CLIArchitecture $CLIArchitecture
+
+$InstallRoot = Resolve-Installation-Path $InstallDir
+Say-Verbose "InstallRoot: $InstallRoot"
+$ScriptName = $MyInvocation.MyCommand.Name
+
+if ($DryRun) {
+    Say "Payload URLs:"
+    Say "Primary named payload URL: $DownloadLink"
+    if ($LegacyDownloadLink) {
+        Say "Legacy named payload URL: $LegacyDownloadLink"
+    }
+    $RepeatableCommand = ".\$ScriptName -Version `"$SpecificVersion`" -InstallDir `"$InstallRoot`" -Architecture `"$CLIArchitecture`""
+    if ($Runtime -eq "dotnet") {
+       $RepeatableCommand+=" -Runtime `"dotnet`""
+    }
+    elseif ($Runtime -eq "aspnetcore") {
+       $RepeatableCommand+=" -Runtime `"aspnetcore`""
+    }
+    foreach ($key in $MyInvocation.BoundParameters.Keys) {
+        if (-not (@("Architecture","Channel","DryRun","InstallDir","Runtime","SharedRuntime","Version") -contains $key)) {
+            $RepeatableCommand+=" -$key `"$($MyInvocation.BoundParameters[$key])`""
+        }
+    }
+    Say "Repeatable invocation: $RepeatableCommand"
+    exit 0
+}
+
+if ($Runtime -eq "dotnet") {
+    $assetName = ".NET Core Runtime"
+    $dotnetPackageRelativePath = "shared\Microsoft.NETCore.App"
+}
+elseif ($Runtime -eq "aspnetcore") {
+    $assetName = "ASP.NET Core Runtime"
+    $dotnetPackageRelativePath = "shared\Microsoft.AspNetCore.App"
+}
+elseif ($Runtime -eq "windowsdesktop") {
+    $assetName = ".NET Core Windows Desktop Runtime"
+    $dotnetPackageRelativePath = "shared\Microsoft.WindowsDesktop.App"
+}
+elseif (-not $Runtime) {
+    $assetName = ".NET Core SDK"
+    $dotnetPackageRelativePath = "sdk"
+}
+else {
+    throw "Invalid value for `$Runtime"
+}
+
+#  Check if the SDK version is already installed.
+$isAssetInstalled = Is-Dotnet-Package-Installed -InstallRoot $InstallRoot -RelativePathToPackage $dotnetPackageRelativePath -SpecificVersion $SpecificVersion
+if ($isAssetInstalled) {
+    Say "$assetName version $SpecificVersion is already installed."
+    Prepend-Sdk-InstallRoot-To-Path -InstallRoot $InstallRoot -BinFolderRelativePath $BinFolderRelativePath
+    exit 0
+}
+
+New-Item -ItemType Directory -Force -Path $InstallRoot | Out-Null
+
+$installDrive = $((Get-Item $InstallRoot).PSDrive.Name);
+$diskInfo = Get-PSDrive -Name $installDrive
+if ($diskInfo.Free / 1MB -le 100) {
+    Say "There is not enough disk space on drive ${installDrive}:"
+    exit 0
+}
+
+$ZipPath = [System.IO.Path]::combine([System.IO.Path]::GetTempPath(), [System.IO.Path]::GetRandomFileName())
+Say-Verbose "Zip path: $ZipPath"
+
+$DownloadFailed = $false
+Say "Downloading link: $DownloadLink"
+try {
+    DownloadFile -Source $DownloadLink -OutPath $ZipPath
+}
+catch {
+    Say "Cannot download: $DownloadLink"
+    if ($LegacyDownloadLink) {
+        $DownloadLink = $LegacyDownloadLink
+        $ZipPath = [System.IO.Path]::combine([System.IO.Path]::GetTempPath(), [System.IO.Path]::GetRandomFileName())
+        Say-Verbose "Legacy zip path: $ZipPath"
+        Say "Downloading legacy link: $DownloadLink"
+        try {
+            DownloadFile -Source $DownloadLink -OutPath $ZipPath
+        }
+        catch {
+            Say "Cannot download: $DownloadLink"
+            $DownloadFailed = $true
+        }
+    }
+    else {
+        $DownloadFailed = $true
+    }
+}
+
+if ($DownloadFailed) {
+    throw "Could not find/download: `"$assetName`" with version = $SpecificVersion`nRefer to: https://aka.ms/dotnet-os-lifecycle for information on .NET Core support"
+}
+
+Say "Extracting zip from $DownloadLink"
+Extract-Dotnet-Package -ZipPath $ZipPath -OutPath $InstallRoot
+
+#  Check if the SDK version is installed; if not, fail the installation.
+$isAssetInstalled = $false
+
+# if the version contains "RTM" or "servicing"; check if a 'release-type' SDK version is installed.
+if ($SpecificVersion -Match "rtm" -or $SpecificVersion -Match "servicing") {
+    $ReleaseVersion = $SpecificVersion.Split("-")[0]
+    Say-Verbose "Checking installation: version = $ReleaseVersion"
+    $isAssetInstalled = Is-Dotnet-Package-Installed -InstallRoot $InstallRoot -RelativePathToPackage $dotnetPackageRelativePath -SpecificVersion $ReleaseVersion
+}
+
+#  Check if the SDK version is installed.
+if (!$isAssetInstalled) {
+    Say-Verbose "Checking installation: version = $SpecificVersion"
+    $isAssetInstalled = Is-Dotnet-Package-Installed -InstallRoot $InstallRoot -RelativePathToPackage $dotnetPackageRelativePath -SpecificVersion $SpecificVersion
+}
+
+if (!$isAssetInstalled) {
+    throw "`"$assetName`" with version = $SpecificVersion failed to install with an unknown error."
+}
+
+Remove-Item $ZipPath
+
+Prepend-Sdk-InstallRoot-To-Path -InstallRoot $InstallRoot -BinFolderRelativePath $BinFolderRelativePath
+
+Say "Installation finished"
+exit 0
+
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