From e54e706650ec17da6cccdad140a8550c46632dc4 Mon Sep 17 00:00:00 2001
From: Jeremy Sinclair <4016293+snickler@users.noreply.github.com>
Date: Sat, 19 Feb 2022 17:07:00 -0500
Subject: [PATCH] Updated dotnet-install scripts to latest version

---
 externals/install-dotnet.ps1 | 812 +++++++++++++++++++----------------
 externals/install-dotnet.sh  | 571 +++++++++++++-----------
 2 files changed, 767 insertions(+), 616 deletions(-)

diff --git a/externals/install-dotnet.ps1 b/externals/install-dotnet.ps1
index bea1827..2b59046 100644
--- a/externals/install-dotnet.ps1
+++ b/externals/install-dotnet.ps1
@@ -66,11 +66,13 @@
     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.
+    For internal use only.
+    Allows using a different storage to download SDK archives from.
+    This parameter is only used if $NoCdn is false.
 .PARAMETER UncachedFeed
-    This parameter typically is not changed by the user.
-    It allows changing the URL for the Uncached feed used by this installer.
+    For internal use only.
+    Allows using a different storage to download SDK archives from.
+    This parameter is only used if $NoCdn is true.
 .PARAMETER ProxyAddress
     If set, the installer will use the proxy when making web requests
 .PARAMETER ProxyUseDefaultCredentials
@@ -104,8 +106,8 @@ param(
    [switch]$SharedRuntime,
    [switch]$DryRun,
    [switch]$NoPath,
-   [string]$AzureFeed="https://dotnetcli.azureedge.net/dotnet",
-   [string]$UncachedFeed="https://dotnetcli.blob.core.windows.net/dotnet",
+   [string]$AzureFeed,
+   [string]$UncachedFeed,
    [string]$FeedCredential,
    [string]$ProxyAddress,
    [switch]$ProxyUseDefaultCredentials,
@@ -119,20 +121,6 @@ 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) {
     try {
         Write-Host "dotnet-install: $str"
@@ -207,9 +195,7 @@ function Get-Machine-Architecture() {
     # To get the correct architecture, we need to use PROCESSOR_ARCHITEW6432.
     # PS x64 doesn't define this, so we fall back to PROCESSOR_ARCHITECTURE.
     # Possible values: amd64, x64, x86, arm64, arm
-
-    if( $ENV:PROCESSOR_ARCHITEW6432 -ne $null )
-    {    
+    if( $ENV:PROCESSOR_ARCHITEW6432 -ne $null ) {
         return $ENV:PROCESSOR_ARCHITEW6432
     }
 
@@ -219,8 +205,11 @@ function Get-Machine-Architecture() {
 function Get-CLIArchitecture-From-Architecture([string]$Architecture) {
     Say-Invocation $MyInvocation
 
+    if ($Architecture -eq "<auto>") {
+        $Architecture = Get-Machine-Architecture
+    }
+
     switch ($Architecture.ToLowerInvariant()) {
-        { $_ -eq "<auto>" } { return Get-CLIArchitecture-From-Architecture $(Get-Machine-Architecture) }
         { ($_ -eq "amd64") -or ($_ -eq "x64") } { return "x64" }
         { $_ -eq "x86" } { return "x86" }
         { $_ -eq "arm" } { return "arm" }
@@ -229,7 +218,25 @@ function Get-CLIArchitecture-From-Architecture([string]$Architecture) {
     }
 }
 
+function ValidateFeedCredential([string] $FeedCredential)
+{
+    if ($Internal -and [string]::IsNullOrWhitespace($FeedCredential)) {
+        $message = "Provide credentials via -FeedCredential parameter."
+        if ($DryRun) {
+            Say-Warning "$message"
+        } else {
+            throw "$message"
+        }
+    }
+    
+    #FeedCredential should start with "?", for it to be added to the end of the link.
+    #adding "?" at the beginning of the FeedCredential if needed.
+    if ((![string]::IsNullOrWhitespace($FeedCredential)) -and ($FeedCredential[0] -ne '?')) {
+        $FeedCredential = "?" + $FeedCredential
+    }
 
+    return $FeedCredential
+}
 function Get-NormalizedQuality([string]$Quality) {
     Say-Invocation $MyInvocation
 
@@ -282,7 +289,7 @@ function Get-NormalizedProduct([string]$Runtime) {
 # Line 2: # 4-part version
 # For the aspnetcore runtime (1 line):
 # Line 1: # 4-part version
-function Get-Version-Info-From-Version-Text([string]$VersionText) {
+function Get-Version-From-LatestVersion-File-Content([string]$VersionText) {
     Say-Invocation $MyInvocation
 
     $Data = -split $VersionText
@@ -321,7 +328,11 @@ function GetHTTPResponse([Uri] $Uri, [bool]$HeaderOnly, [bool]$DisableRedirect,
                     # 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
+                        if ($null -ne $DefaultProxy.GetProxy($Uri)) {
+                            $ProxyAddress = $DefaultProxy.GetProxy($Uri).OriginalString
+                        } else {
+                            $ProxyAddress = $null
+                        }
                         $ProxyUseDefaultCredentials = $true
                     }
                 } catch {
@@ -424,21 +435,21 @@ function GetHTTPResponse([Uri] $Uri, [bool]$HeaderOnly, [bool]$DisableRedirect,
     }
 }
 
-function Get-Latest-Version-Info([string]$AzureFeed, [string]$Channel) {
+function Get-Version-From-LatestVersion-File([string]$AzureFeed, [string]$Channel) {
     Say-Invocation $MyInvocation
 
     $VersionFileUrl = $null
     if ($Runtime -eq "dotnet") {
-        $VersionFileUrl = "$UncachedFeed/Runtime/$Channel/latest.version"
+        $VersionFileUrl = "$AzureFeed/Runtime/$Channel/latest.version"
     }
     elseif ($Runtime -eq "aspnetcore") {
-        $VersionFileUrl = "$UncachedFeed/aspnetcore/Runtime/$Channel/latest.version"
+        $VersionFileUrl = "$AzureFeed/aspnetcore/Runtime/$Channel/latest.version"
     }
     elseif ($Runtime -eq "windowsdesktop") {
-        $VersionFileUrl = "$UncachedFeed/WindowsDesktop/$Channel/latest.version"
+        $VersionFileUrl = "$AzureFeed/WindowsDesktop/$Channel/latest.version"
     }
     elseif (-not $Runtime) {
-        $VersionFileUrl = "$UncachedFeed/Sdk/$Channel/latest.version"
+        $VersionFileUrl = "$AzureFeed/Sdk/$Channel/latest.version"
     }
     else {
         throw "Invalid value for `$Runtime"
@@ -450,7 +461,7 @@ function Get-Latest-Version-Info([string]$AzureFeed, [string]$Channel) {
         $Response = GetHTTPResponse -Uri $VersionFileUrl
     }
     catch {
-        Say-Error "Could not resolve version information."
+        Say-Verbose "Failed to download latest.version file."
         throw
     }
     $StringContent = $Response.Content.ReadAsStringAsync().Result
@@ -462,7 +473,7 @@ function Get-Latest-Version-Info([string]$AzureFeed, [string]$Channel) {
         default { throw "``$Response.Content.Headers.ContentType`` is an unknown .version file content type." }
     }
 
-    $VersionInfo = Get-Version-Info-From-Version-Text $VersionText
+    $VersionInfo = Get-Version-From-LatestVersion-File-Content $VersionText
 
     return $VersionInfo
 }
@@ -509,7 +520,7 @@ function Get-Specific-Version-From-Version([string]$AzureFeed, [string]$Channel,
 
     if (-not $JSonFile) {
         if ($Version.ToLowerInvariant() -eq "latest") {
-            $LatestVersionInfo = Get-Latest-Version-Info -AzureFeed $AzureFeed -Channel $Channel
+            $LatestVersionInfo = Get-Version-From-LatestVersion-File -AzureFeed $AzureFeed -Channel $Channel
             return $LatestVersionInfo.Version
         }
         else {
@@ -722,7 +733,8 @@ function Get-Absolute-Path([string]$RelativeOrAbsolutePath) {
 }
 
 function Get-Path-Prefix-With-Version($path) {
-    $match = [regex]::match($path, $VersionRegEx)
+    # example path with regex: shared/1.0.0-beta-12345/somepath
+    $match = [regex]::match($path, "/\d+\.\d+[^/]+/")
     if ($match.Success) {
         return $entry.FullName.Substring(0, $match.Index + $match.Length)
     }
@@ -736,7 +748,7 @@ function Get-List-Of-Directories-And-Versions-To-Unpack-From-Dotnet-Package([Sys
     $ret = @()
     foreach ($entry in $Zip.Entries) {
         $dir = Get-Path-Prefix-With-Version $entry.FullName
-        if ($dir -ne $null) {
+        if ($null -ne $dir) {
             $path = Get-Absolute-Path $(Join-Path -Path $OutPath -ChildPath $dir)
             if (-Not (Test-Path $path -PathType Container)) {
                 $ret += $dir
@@ -777,7 +789,7 @@ function Extract-Dotnet-Package([string]$ZipPath, [string]$OutPath) {
 
         foreach ($entry in $Zip.Entries) {
             $PathWithVersion = Get-Path-Prefix-With-Version $entry.FullName
-            if (($PathWithVersion -eq $null) -Or ($DirectoriesToUnpack -contains $PathWithVersion)) {
+            if (($null -eq $PathWithVersion) -Or ($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 $DestinationPath))
@@ -789,7 +801,7 @@ function Extract-Dotnet-Package([string]$ZipPath, [string]$OutPath) {
         }
     }
     finally {
-        if ($Zip -ne $null) {
+        if ($null -ne $Zip) {
             $Zip.Dispose()
         }
     }
@@ -818,7 +830,7 @@ function DownloadFile($Source, [string]$OutPath) {
         $File.Close()
     }
     finally {
-        if ($Stream -ne $null) {
+        if ($null -ne $Stream) {
             $Stream.Dispose()
         }
     }
@@ -841,8 +853,8 @@ function SafeRemoveFile($Path) {
     }
 }
 
-function Prepend-Sdk-InstallRoot-To-Path([string]$InstallRoot, [string]$BinFolderRelativePath) {
-    $BinPath = Get-Absolute-Path $(Join-Path -Path $InstallRoot -ChildPath $BinFolderRelativePath)
+function Prepend-Sdk-InstallRoot-To-Path([string]$InstallRoot) {
+    $BinPath = Get-Absolute-Path $(Join-Path -Path $InstallRoot -ChildPath "")
     if (-Not $NoPath) {
         $SuffixedBinPath = "$BinPath;"
         if (-Not $env:path.Contains($SuffixedBinPath)) {
@@ -857,6 +869,36 @@ function Prepend-Sdk-InstallRoot-To-Path([string]$InstallRoot, [string]$BinFolde
     }
 }
 
+function PrintDryRunOutput($Invocation, $DownloadLinks)
+{
+    Say "Payload URLs:"
+    
+    for ($linkIndex=0; $linkIndex -lt $DownloadLinks.count; $linkIndex++) {
+        Say "URL #$linkIndex - $($DownloadLinks[$linkIndex].type): $($DownloadLinks[$linkIndex].downloadLink)"
+    }
+    $RepeatableCommand = ".\$ScriptName -Version `"$SpecificVersion`" -InstallDir `"$InstallRoot`" -Architecture `"$CLIArchitecture`""
+    if ($Runtime -eq "dotnet") {
+       $RepeatableCommand+=" -Runtime `"dotnet`""
+    }
+    elseif ($Runtime -eq "aspnetcore") {
+       $RepeatableCommand+=" -Runtime `"aspnetcore`""
+    }
+
+    foreach ($key in $Invocation.BoundParameters.Keys) {
+        if (-not (@("Architecture","Channel","DryRun","InstallDir","Runtime","SharedRuntime","Version","Quality","FeedCredential") -contains $key)) {
+            $RepeatableCommand+=" -$key `"$($Invocation.BoundParameters[$key])`""
+        }
+    }
+    if ($Invocation.BoundParameters.Keys -contains "FeedCredential") {
+        $RepeatableCommand+=" -FeedCredential `"<feedCredential>`""
+    }
+    Say "Repeatable invocation: $RepeatableCommand"
+    if ($SpecificVersion -ne $EffectiveVersion)
+    {
+        Say "NOTE: Due to finding a version manifest with this runtime, it would actually install with version '$EffectiveVersion'"
+    }
+}
+
 function Get-AkaMSDownloadLink([string]$Channel, [string]$Quality, [bool]$Internal, [string]$Product, [string]$Architecture) {
     Say-Invocation $MyInvocation 
 
@@ -930,25 +972,119 @@ function Get-AkaMSDownloadLink([string]$Channel, [string]$Quality, [bool]$Intern
 
 }
 
+function Get-AkaMsLink-And-Version([string] $NormalizedChannel, [string] $NormalizedQuality, [bool] $Internal, [string] $ProductName, [string] $Architecture) {
+    $AkaMsDownloadLink = Get-AkaMSDownloadLink -Channel $NormalizedChannel -Quality $NormalizedQuality -Internal $Internal -Product $ProductName -Architecture $Architecture
+   
+    if ([string]::IsNullOrEmpty($AkaMsDownloadLink)){
+        if (-not [string]::IsNullOrEmpty($NormalizedQuality)) {
+            # if quality is specified - exit with error - there is no fallback approach
+            Say-Error "Failed to locate the latest version in the channel '$NormalizedChannel' with '$NormalizedQuality' quality for '$ProductName', os: 'win', architecture: '$Architecture'."
+            Say-Error "Refer to: https://aka.ms/dotnet-os-lifecycle for information on .NET Core support."
+            throw "aka.ms link resolution failure"
+        }
+        Say-Verbose "Falling back to latest.version file approach."
+        return ($null, $null, $null)
+    }
+    else {
+        Say-Verbose "Retrieved primary named payload URL from aka.ms link: '$AkaMsDownloadLink'."
+        Say-Verbose  "Downloading using legacy url will not be attempted."
+
+        #get version from the path
+        $pathParts = $AkaMsDownloadLink.Split('/')
+        if ($pathParts.Length -ge 2) { 
+            $SpecificVersion = $pathParts[$pathParts.Length - 2]
+            Say-Verbose "Version: '$SpecificVersion'."
+        }
+        else {
+            Say-Error "Failed to extract the version from download link '$AkaMsDownloadLink'."
+            return ($null, $null, $null)
+        }
+
+        #retrieve effective (product) version
+        $EffectiveVersion = Get-Product-Version -SpecificVersion $SpecificVersion -PackageDownloadLink $AkaMsDownloadLink
+        Say-Verbose "Product version: '$EffectiveVersion'."
+
+        return ($AkaMsDownloadLink, $SpecificVersion, $EffectiveVersion);
+    }
+}
+
+function Get-Feeds-To-Use()
+{
+    $feeds = @(
+    "https://dotnetcli.azureedge.net/dotnet",
+    "https://dotnetbuilds.azureedge.net/public"
+    )
+
+    if (-not [string]::IsNullOrEmpty($AzureFeed)) {
+        $feeds = @($AzureFeed)
+    }
+
+    if ($NoCdn) {
+        $feeds = @(
+        "https://dotnetcli.blob.core.windows.net/dotnet",
+        "https://dotnetbuilds.blob.core.windows.net/public"
+        )
+
+        if (-not [string]::IsNullOrEmpty($UncachedFeed)) {
+            $feeds = @($UncachedFeed)
+        }
+    }
+
+    return $feeds
+}
+
+function Resolve-AssetName-And-RelativePath([string] $Runtime) {
+    
+    if ($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"
+    }
+
+    return ($assetName, $dotnetPackageRelativePath)
+}
+
+function Prepare-Install-Directory {
+    New-Item -ItemType Directory -Force -Path $InstallRoot | Out-Null
+
+    $installDrive = $((Get-Item $InstallRoot -Force).PSDrive.Name);
+    $diskInfo = $null
+    try{
+        $diskInfo = Get-PSDrive -Name $installDrive
+    }
+    catch{
+        Say-Warning "Failed to check the disk space. Installation will continue, but it may fail if you do not have enough disk space."
+    }
+    
+    if ( ($null -ne $diskInfo) -and ($diskInfo.Free / 1MB -le 100)) {
+        throw "There is not enough disk space on drive ${installDrive}:"
+    }
+}
+
 Say "Note that the intended use of this script is for Continuous Integration (CI) scenarios, where:"
 Say "- The SDK needs to be installed without user interaction and without admin rights."
 Say "- The SDK installation doesn't need to persist across multiple CI runs."
 Say "To set up a development environment or to run apps, use installers rather than this script. Visit https://dotnet.microsoft.com/download to get the installer.`r`n"
 
-if ($Internal -and [string]::IsNullOrWhitespace($FeedCredential)) {
-    $message = "Provide credentials via -FeedCredential parameter."
-    if ($DryRun) {
-        Say-Warning "$message"
-    } else {
-        throw "$message"
-    }
+if ($SharedRuntime -and (-not $Runtime)) {
+    $Runtime = "dotnet"
 }
 
-#FeedCredential should start with "?", for it to be added to the end of the link.
-#adding "?" at the beginning of the FeedCredential if needed.
-if ((![string]::IsNullOrWhitespace($FeedCredential)) -and ($FeedCredential[0] -ne '?')) {
-    $FeedCredential = "?" + $FeedCredential
-}
+$OverrideNonVersionedFiles = !$SkipNonVersionedFiles
 
 $CLIArchitecture = Get-CLIArchitecture-From-Architecture $Architecture
 $NormalizedQuality = Get-NormalizedQuality $Quality
@@ -957,294 +1093,200 @@ $NormalizedChannel = Get-NormalizedChannel $Channel
 Say-Verbose "Normalized channel: '$NormalizedChannel'"
 $NormalizedProduct = Get-NormalizedProduct $Runtime
 Say-Verbose "Normalized product: '$NormalizedProduct'"
-$DownloadLink = $null
-
-#try to get download location from aka.ms link
-#not applicable when exact version is specified via command or json file
-if ([string]::IsNullOrEmpty($JSonFile) -and ($Version -eq "latest")) {
-    $AkaMsDownloadLink = Get-AkaMSDownloadLink -Channel $NormalizedChannel -Quality $NormalizedQuality -Internal $Internal -Product $NormalizedProduct -Architecture $CLIArchitecture
-   
-    if ([string]::IsNullOrEmpty($AkaMsDownloadLink)){
-        if (-not [string]::IsNullOrEmpty($NormalizedQuality)) {
-            # if quality is specified - exit with error - there is no fallback approach
-            Say-Error "Failed to locate the latest version in the channel '$NormalizedChannel' with '$NormalizedQuality' quality for '$NormalizedProduct', os: 'win', architecture: '$CLIArchitecture'."
-            Say-Error "Refer to: https://aka.ms/dotnet-os-lifecycle for information on .NET Core support."
-            throw "aka.ms link resolution failure"
-        }
-        Say-Verbose "Falling back to latest.version file approach."
-    }
-    else {
-        Say-Verbose "Retrieved primary named payload URL from aka.ms link: '$AkaMsDownloadLink'."
-        $DownloadLink = $AkaMsDownloadLink
-        Say-Verbose  "Downloading using legacy url will not be attempted."
-        $LegacyDownloadLink = $null
-
-        #get version from the path
-        $pathParts = $DownloadLink.Split('/')
-        if ($pathParts.Length -ge 2) { 
-            $SpecificVersion = $pathParts[$pathParts.Length - 2]
-            Say-Verbose "Version: '$SpecificVersion'."
-        }
-        else {
-            Say-Error "Failed to extract the version from download link '$DownloadLink'."
-        }
-
-        #retrieve effective (product) version
-        $EffectiveVersion = Get-Product-Version -AzureFeed $AzureFeed -SpecificVersion $SpecificVersion -PackageDownloadLink $DownloadLink
-        Say-Verbose "Product version: '$EffectiveVersion'."
-    }
-}
-
-if ([string]::IsNullOrEmpty($DownloadLink)) {
-    $SpecificVersion = Get-Specific-Version-From-Version -AzureFeed $AzureFeed -Channel $Channel -Version $Version -JSonFile $JSonFile
-    $DownloadLink, $EffectiveVersion = Get-Download-Link -AzureFeed $AzureFeed -SpecificVersion $SpecificVersion -CLIArchitecture $CLIArchitecture
-    $LegacyDownloadLink = Get-LegacyDownload-Link -AzureFeed $AzureFeed -SpecificVersion $SpecificVersion -CLIArchitecture $CLIArchitecture
-}
-
+$FeedCredential = ValidateFeedCredential $FeedCredential
 
 $InstallRoot = Resolve-Installation-Path $InstallDir
 Say-Verbose "InstallRoot: $InstallRoot"
 $ScriptName = $MyInvocation.MyCommand.Name
+($assetName, $dotnetPackageRelativePath) = Resolve-AssetName-And-RelativePath -Runtime $Runtime
 
-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") {
-       $RepeatableCommand+=" -Runtime `"aspnetcore`""
-    }
+$feeds = Get-Feeds-To-Use
+$DownloadLinks = @()
 
-    if (-not [string]::IsNullOrEmpty($NormalizedQuality))
-    {
-        $RepeatableCommand+=" -Quality `"$NormalizedQuality`""
-    }
-
-    foreach ($key in $MyInvocation.BoundParameters.Keys) {
-        if (-not (@("Architecture","Channel","DryRun","InstallDir","Runtime","SharedRuntime","Version","Quality","FeedCredential") -contains $key)) {
-            $RepeatableCommand+=" -$key `"$($MyInvocation.BoundParameters[$key])`""
+# aka.ms links can only be used if the user did not request a specific version via the command line or a global.json file.
+if ([string]::IsNullOrEmpty($JSonFile) -and ($Version -eq "latest")) {
+    ($DownloadLink, $SpecificVersion, $EffectiveVersion) = Get-AkaMsLink-And-Version $NormalizedChannel $NormalizedQuality $Internal $NormalizedProduct $CLIArchitecture
+    
+    if ($null -ne $DownloadLink) {
+        $DownloadLinks += New-Object PSObject -Property @{downloadLink="$DownloadLink";specificVersion="$SpecificVersion";effectiveVersion="$EffectiveVersion";type='aka.ms'}
+        Say-Verbose "Generated aka.ms link $DownloadLink with version $EffectiveVersion"
+        
+        if (-Not $DryRun) {
+            Say-Verbose "Checking if the version $EffectiveVersion is already installed"
+            if (Is-Dotnet-Package-Installed -InstallRoot $InstallRoot -RelativePathToPackage $dotnetPackageRelativePath -SpecificVersion $EffectiveVersion)
+            {
+                Say "$assetName with version '$EffectiveVersion' is already installed."
+                Prepend-Sdk-InstallRoot-To-Path -InstallRoot $InstallRoot
+                return
+            }
         }
     }
-    if ($MyInvocation.BoundParameters.Keys -contains "FeedCredential") {
-        $RepeatableCommand+=" -FeedCredential `"<feedCredential>`""
-    }
-    Say "Repeatable invocation: $RepeatableCommand"
-    if ($SpecificVersion -ne $EffectiveVersion)
-    {
-        Say "NOTE: Due to finding a version manifest with this runtime, it would actually install with version '$EffectiveVersion'"
-    }
-
-    return
 }
 
-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"
-}
-
-if ($SpecificVersion -ne $EffectiveVersion)
+# Primary and legacy links cannot be used if a quality was specified.
+# If we already have an aka.ms link, no need to search the blob feeds.
+if ([string]::IsNullOrEmpty($NormalizedQuality) -and 0 -eq $DownloadLinks.count)
 {
-   Say "Performing installation checks for effective version: $EffectiveVersion"
-   $SpecificVersion = $EffectiveVersion
+    foreach ($feed in $feeds) {
+        try {
+            $SpecificVersion = Get-Specific-Version-From-Version -AzureFeed $feed -Channel $Channel -Version $Version -JSonFile $JSonFile
+            $DownloadLink, $EffectiveVersion = Get-Download-Link -AzureFeed $feed -SpecificVersion $SpecificVersion -CLIArchitecture $CLIArchitecture
+            $LegacyDownloadLink = Get-LegacyDownload-Link -AzureFeed $feed -SpecificVersion $SpecificVersion -CLIArchitecture $CLIArchitecture
+            
+            $DownloadLinks += New-Object PSObject -Property @{downloadLink="$DownloadLink";specificVersion="$SpecificVersion";effectiveVersion="$EffectiveVersion";type='primary'}
+            Say-Verbose "Generated primary link $DownloadLink with version $EffectiveVersion"
+    
+            if (-not [string]::IsNullOrEmpty($LegacyDownloadLink)) {
+                $DownloadLinks += New-Object PSObject -Property @{downloadLink="$LegacyDownloadLink";specificVersion="$SpecificVersion";effectiveVersion="$EffectiveVersion";type='legacy'}
+                Say-Verbose "Generated legacy link $LegacyDownloadLink with version $EffectiveVersion"
+            }
+    
+            if (-Not $DryRun) {
+                Say-Verbose "Checking if the version $EffectiveVersion is already installed"
+                if (Is-Dotnet-Package-Installed -InstallRoot $InstallRoot -RelativePathToPackage $dotnetPackageRelativePath -SpecificVersion $EffectiveVersion)
+                {
+                    Say "$assetName with version '$EffectiveVersion' is already installed."
+                    Prepend-Sdk-InstallRoot-To-Path -InstallRoot $InstallRoot
+                    return
+                }
+            }
+        }
+        catch
+        {
+            Say-Verbose "Failed to acquire download links from feed $feed. Exception: $_"
+        }
+    }
 }
 
-#  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 $BinFolderRelativePath
+if ($DownloadLinks.count -eq 0) {
+    throw "Failed to resolve the exact version number."
+}
+
+if ($DryRun) {
+    PrintDryRunOutput $MyInvocation $DownloadLinks
     return
 }
 
-New-Item -ItemType Directory -Force -Path $InstallRoot | Out-Null
-
-$installDrive = $((Get-Item $InstallRoot -Force).PSDrive.Name);
-$diskInfo = $null
-try{
-    $diskInfo = Get-PSDrive -Name $installDrive
-}
-catch{
-    Say-Warning "Failed to check the disk space. Installation will continue, but it may fail if you do not have enough disk space."
-}
-
-if ( ($diskInfo -ne $null) -and ($diskInfo.Free / 1MB -le 100)) {
-    throw "There is not enough disk space on drive ${installDrive}:"
-}
+Prepare-Install-Directory
 
 $ZipPath = [System.IO.Path]::combine([System.IO.Path]::GetTempPath(), [System.IO.Path]::GetRandomFileName())
 Say-Verbose "Zip path: $ZipPath"
 
-$DownloadFailed = $false
+$DownloadSucceeded = $false
+$DownloadedLink = $null
+$ErrorMessages = @()
 
-$PrimaryDownloadStatusCode = 0
-$LegacyDownloadStatusCode = 0
+foreach ($link in $DownloadLinks)
+{
+    Say-Verbose "Downloading `"$($link.type)`" link $($link.downloadLink)"
 
-$PrimaryDownloadFailedMsg = ""
-$LegacyDownloadFailedMsg = ""
+    try {
+        DownloadFile -Source $link.downloadLink -OutPath $ZipPath
+        Say-Verbose "Download succeeded."
+        $DownloadSucceeded = $true
+        $DownloadedLink = $link
+        break
+    }
+    catch {
+        $StatusCode = $null
+        $ErrorMessage = $null
 
-Say "Downloading primary link $DownloadLink"
-try {
-    DownloadFile -Source $DownloadLink -OutPath $ZipPath
-}
-catch {
-    if ($PSItem.Exception.Data.Contains("StatusCode")) {
-        $PrimaryDownloadStatusCode = $PSItem.Exception.Data["StatusCode"]
-    }
-
-    if ($PSItem.Exception.Data.Contains("ErrorMessage")) {
-        $PrimaryDownloadFailedMsg = $PSItem.Exception.Data["ErrorMessage"]
-    } else {
-        $PrimaryDownloadFailedMsg = $PSItem.Exception.Message
-    }
-
-    if ($PrimaryDownloadStatusCode -eq 404) {
-        Say "The resource at $DownloadLink is not available."
-    } else {
-        Say $PSItem.Exception.Message
+        if ($PSItem.Exception.Data.Contains("StatusCode")) {
+            $StatusCode = $PSItem.Exception.Data["StatusCode"]
+        }
+    
+        if ($PSItem.Exception.Data.Contains("ErrorMessage")) {
+            $ErrorMessage = $PSItem.Exception.Data["ErrorMessage"]
+        } else {
+            $ErrorMessage = $PSItem.Exception.Message
+        }
+
+        Say-Verbose "Download failed with status code $StatusCode. Error message: $ErrorMessage"
+        $ErrorMessages += "Downloading from `"$($link.type)`" link has failed with error:`nUri: $($link.downloadLink)`nStatusCode: $StatusCode`nError: $ErrorMessage"
     }
 
+    # This link failed. Clean up before trying the next one.
     SafeRemoveFile -Path $ZipPath
-
-    if ($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 $ZipPath
-        }
-        catch {
-            if ($PSItem.Exception.Data.Contains("StatusCode")) {
-                $LegacyDownloadStatusCode = $PSItem.Exception.Data["StatusCode"]
-            }
-
-            if ($PSItem.Exception.Data.Contains("ErrorMessage")) {
-                $LegacyDownloadFailedMsg = $PSItem.Exception.Data["ErrorMessage"]
-            } else {
-                $LegacyDownloadFailedMsg = $PSItem.Exception.Message
-            }
-
-            if ($LegacyDownloadStatusCode -eq 404) {
-                Say "The resource at $DownloadLink is not available."
-            } else {
-                Say $PSItem.Exception.Message
-            }
-
-            SafeRemoveFile -Path $ZipPath
-            $DownloadFailed = $true
-        }
-    }
-    else {
-        $DownloadFailed = $true
-    }
 }
 
-if ($DownloadFailed) {
-    if (($PrimaryDownloadStatusCode -eq 404) -and ((-not $LegacyDownloadLink) -or ($LegacyDownloadStatusCode -eq 404))) {
-        throw "Could not find `"$assetName`" with version = $SpecificVersion`nRefer to: https://aka.ms/dotnet-os-lifecycle for information on .NET Core support"
-    } else {
-        # 404-NotFound is an expected response if it goes from only one of the links, do not show that error.
-        # If primary path is available (not 404-NotFound) then show the primary error else show the legacy error.
-        if ($PrimaryDownloadStatusCode -ne 404) {
-            throw "Could not download `"$assetName`" with version = $SpecificVersion`r`n$PrimaryDownloadFailedMsg"
-        }
-        if (($LegacyDownloadLink) -and ($LegacyDownloadStatusCode -ne 404)) {
-            throw "Could not download `"$assetName`" with version = $SpecificVersion`r`n$LegacyDownloadFailedMsg"
-        }
-        throw "Could not download `"$assetName`" with version = $SpecificVersion"
+if (-not $DownloadSucceeded) {
+    foreach ($ErrorMessage in $ErrorMessages) {
+        Say-Error $ErrorMessages
     }
+
+    throw "Could not find `"$assetName`" with version = $($DownloadLinks[0].effectiveVersion)`nRefer to: https://aka.ms/dotnet-os-lifecycle for information on .NET support"
 }
 
-Say "Extracting zip from $DownloadLink"
+Say "Extracting the archive."
 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 = $SpecificVersion.Split("-")[0]
+if ($DownloadedLink.effectiveVersion -Match "rtm" -or $DownloadedLink.effectiveVersion -Match "servicing") {
+    $ReleaseVersion = $DownloadedLink.effectiveVersion.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
+    Say-Verbose "Checking installation: version = $($DownloadedLink.effectiveVersion)"
+    $isAssetInstalled = Is-Dotnet-Package-Installed -InstallRoot $InstallRoot -RelativePathToPackage $dotnetPackageRelativePath -SpecificVersion $DownloadedLink.effectiveVersion
 }
 
 # Version verification failed. More likely something is wrong either with the downloaded content or with the verification algorithm.
 if (!$isAssetInstalled) {
-    Say-Error "Failed to verify the version of installed `"$assetName`".`nInstallation source: $DownloadLink.`nInstallation location: $InstallRoot.`nReport the bug at https://github.com/dotnet/install-scripts/issues."
-    throw "`"$assetName`" with version = $SpecificVersion failed to install with an unknown error."
+    Say-Error "Failed to verify the version of installed `"$assetName`".`nInstallation source: $($DownloadedLink.downloadLink).`nInstallation location: $InstallRoot.`nReport the bug at https://github.com/dotnet/install-scripts/issues."
+    throw "`"$assetName`" with version = $($DownloadedLink.effectiveVersion) failed to install with an unknown error."
 }
 
 SafeRemoveFile -Path $ZipPath
 
-Prepend-Sdk-InstallRoot-To-Path -InstallRoot $InstallRoot -BinFolderRelativePath $BinFolderRelativePath
+Prepend-Sdk-InstallRoot-To-Path -InstallRoot $InstallRoot
 
 Say "Note that the script does not resolve dependencies during installation."
 Say "To check the list of dependencies, go to https://docs.microsoft.com/dotnet/core/install/windows#dependencies"
 Say "Installation finished"
 
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@@ -1284,119 +1326,141 @@ Say "Installation finished"
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+# oSkLphLv0GiFseJhPvXGQPypnyN8
 # SIG # End signature block
diff --git a/externals/install-dotnet.sh b/externals/install-dotnet.sh
index 1903673..f80355e 100755
--- a/externals/install-dotnet.sh
+++ b/externals/install-dotnet.sh
@@ -135,6 +135,31 @@ get_legacy_os_name_from_platform() {
     return 1
 }
 
+get_legacy_os_name() {
+    eval $invocation
+
+    local uname=$(uname)
+    if [ "$uname" = "Darwin" ]; then
+        echo "osx"
+        return 0
+    elif [ -n "$runtime_id" ]; then
+        echo $(get_legacy_os_name_from_platform "${runtime_id%-*}" || echo "${runtime_id%-*}")
+        return 0
+    else
+        if [ -e /etc/os-release ]; then
+            . /etc/os-release
+            os=$(get_legacy_os_name_from_platform "$ID${VERSION_ID:+.${VERSION_ID}}" || echo "")
+            if [ -n "$os" ]; then
+                echo "$os"
+                return 0
+            fi
+        fi
+    fi
+
+    say_verbose "Distribution specific OS name and version could not be detected: UName = $uname"
+    return 1
+}
+
 get_linux_platform_name() {
     eval $invocation
 
@@ -174,8 +199,8 @@ get_current_os_name() {
         echo "freebsd"
         return 0
     elif [ "$uname" = "Linux" ]; then
-        local linux_platform_name
-        linux_platform_name="$(get_linux_platform_name)" || { echo "linux" && return 0 ; }
+        local linux_platform_name=""
+        linux_platform_name="$(get_linux_platform_name)" || true
 
         if [ "$linux_platform_name" = "rhel.6" ]; then
             echo $linux_platform_name
@@ -196,31 +221,6 @@ get_current_os_name() {
     return 1
 }
 
-get_legacy_os_name() {
-    eval $invocation
-
-    local uname=$(uname)
-    if [ "$uname" = "Darwin" ]; then
-        echo "osx"
-        return 0
-    elif [ -n "$runtime_id" ]; then
-        echo $(get_legacy_os_name_from_platform "${runtime_id%-*}" || echo "${runtime_id%-*}")
-        return 0
-    else
-        if [ -e /etc/os-release ]; then
-            . /etc/os-release
-            os=$(get_legacy_os_name_from_platform "$ID${VERSION_ID:+.${VERSION_ID}}" || echo "")
-            if [ -n "$os" ]; then
-                echo "$os"
-                return 0
-            fi
-        fi
-    fi
-
-    say_verbose "Distribution specific OS name and version could not be detected: UName = $uname"
-    return 1
-}
-
 machine_has() {
     eval $invocation
 
@@ -228,7 +228,6 @@ machine_has() {
     return $?
 }
 
-
 check_min_reqs() {
     local hasMinimum=false
     if machine_has "curl"; then
@@ -321,11 +320,13 @@ get_normalized_architecture_from_architecture() {
     eval $invocation
 
     local architecture="$(to_lowercase "$1")"
+
+    if [[ $architecture == \<auto\> ]]; then
+        echo "$(get_machine_architecture)"
+        return 0
+    fi
+
     case "$architecture" in
-        \<auto\>)
-            echo "$(get_normalized_architecture_from_architecture "$(get_machine_architecture)")"
-            return 0
-            ;;
         amd64|x64)
             echo "x64"
             return 0
@@ -425,6 +426,7 @@ get_normalized_channel() {
 get_normalized_product() {
     eval $invocation
 
+    local product=""
     local runtime="$(to_lowercase "$1")"
     if [[ "$runtime" == "dotnet" ]]; then
         product="dotnet-runtime"
@@ -446,7 +448,7 @@ get_normalized_product() {
 
 # args:
 # version_text - stdin
-get_version_from_version_info() {
+get_version_from_latestversion_file_content() {
     eval $invocation
 
     cat | tail -n 1 | sed 's/\r$//'
@@ -478,7 +480,7 @@ is_dotnet_package_installed() {
 # azure_feed - $1
 # channel - $2
 # normalized_architecture - $3
-get_latest_version_info() {
+get_version_from_latestversion_file() {
     eval $invocation
 
     local azure_feed="$1"
@@ -487,24 +489,24 @@ get_latest_version_info() {
 
     local version_file_url=null
     if [[ "$runtime" == "dotnet" ]]; then
-        version_file_url="$uncached_feed/Runtime/$channel/latest.version"
+        version_file_url="$azure_feed/Runtime/$channel/latest.version"
     elif [[ "$runtime" == "aspnetcore" ]]; then
-        version_file_url="$uncached_feed/aspnetcore/Runtime/$channel/latest.version"
+        version_file_url="$azure_feed/aspnetcore/Runtime/$channel/latest.version"
     elif [ -z "$runtime" ]; then
-         version_file_url="$uncached_feed/Sdk/$channel/latest.version"
+         version_file_url="$azure_feed/Sdk/$channel/latest.version"
     else
         say_err "Invalid value for \$runtime"
         return 1
     fi
-    say_verbose "get_latest_version_info: latest url: $version_file_url"
+    say_verbose "get_version_from_latestversion_file: latest url: $version_file_url"
 
-    download "$version_file_url"
-    return $?
+    download "$version_file_url" || return $?
+    return 0
 }
 
 # args:
 # json_file - $1
-parse_jsonfile_for_version() {
+parse_globaljson_file_for_version() {
     eval $invocation
 
     local json_file="$1"
@@ -560,9 +562,9 @@ get_specific_version_from_version() {
     if [ -z "$json_file" ]; then
         if [[ "$version" == "latest" ]]; then
             local version_info
-            version_info="$(get_latest_version_info "$azure_feed" "$channel" "$normalized_architecture" false)" || return 1
+            version_info="$(get_version_from_latestversion_file "$azure_feed" "$channel" "$normalized_architecture" false)" || return 1
             say_verbose "get_specific_version_from_version: version_info=$version_info"
-            echo "$version_info" | get_version_from_version_info
+            echo "$version_info" | get_version_from_latestversion_file_content
             return 0
         else
             echo "$version"
@@ -570,7 +572,7 @@ get_specific_version_from_version() {
         fi
     else
         local version_info
-        version_info="$(parse_jsonfile_for_version "$json_file")" || return 1
+        version_info="$(parse_globaljson_file_for_version "$json_file")" || return 1
         echo "$version_info"
         return 0
     fi
@@ -635,14 +637,14 @@ get_specific_product_version() {
 
         if machine_has "curl"
         then
-            specific_product_version=$(curl -s --fail "${download_link}${feed_credential}")
+            specific_product_version=$(curl -s --fail "${download_link}${feed_credential}" 2>&1)
             if [ $? = 0 ]; then
                 echo "${specific_product_version//[$'\t\r\n']}"
                 return 0
             fi
         elif machine_has "wget"
         then
-            specific_product_version=$(wget -qO- "${download_link}${feed_credential}")
+            specific_product_version=$(wget -qO- "${download_link}${feed_credential}" 2>&1)
             if [ $? = 0 ]; then
                 echo "${specific_product_version//[$'\t\r\n']}"
                 return 0
@@ -907,7 +909,7 @@ get_http_header_curl() {
     fi
 
     curl_options="-I -sSL --retry 5 --retry-delay 2 --connect-timeout 15 "
-    curl $curl_options "$remote_path_with_credential" || return 1
+    curl $curl_options "$remote_path_with_credential" 2>&1 || return 1
     return 0
 }
 
@@ -918,15 +920,26 @@ get_http_header_wget() {
     eval $invocation
     local remote_path="$1"
     local disable_feed_credential="$2"
+    local wget_options="-q -S --spider --tries 5 "
+    # Store options that aren't supported on all wget implementations separately.
+    local wget_options_extra="--waitretry 2 --connect-timeout 15 "
+    local wget_result=''
 
     remote_path_with_credential="$remote_path"
     if [ "$disable_feed_credential" = false ]; then
         remote_path_with_credential+="$feed_credential"
     fi
 
-    wget_options="-q -S --spider --tries 5 --waitretry 2 --connect-timeout 15 "
-    wget $wget_options "$remote_path_with_credential" 2>&1 || return 1
-    return 0
+    wget $wget_options $wget_options_extra "$remote_path_with_credential" 2>&1
+    wget_result=$?
+
+    if [[ $wget_result == 2 ]]; then
+        # Parsing of the command has failed. Exclude potentially unrecognized options and retry.
+        wget $wget_options "$remote_path_with_credential" 2>&1
+        return $?
+    fi
+
+    return $wget_result
 }
 
 # args:
@@ -988,9 +1001,9 @@ downloadcurl() {
     local curl_options="--retry 20 --retry-delay 2 --connect-timeout 15 -sSL -f --create-dirs "
     local failed=false
     if [ -z "$out_path" ]; then
-        curl $curl_options "$remote_path_with_credential" || failed=true
+        curl $curl_options "$remote_path_with_credential" 2>&1 || failed=true
     else
-        curl $curl_options -o "$out_path" "$remote_path_with_credential" || failed=true
+        curl $curl_options -o "$out_path" "$remote_path_with_credential" 2>&1 || failed=true
     fi
     if [ "$failed" = true ]; then
         local disable_feed_credential=false
@@ -1016,14 +1029,31 @@ downloadwget() {
     local out_path="${2:-}"
     # Append feed_credential as late as possible before calling wget to avoid logging feed_credential
     local remote_path_with_credential="${remote_path}${feed_credential}"
-    local wget_options="--tries 20 --waitretry 2 --connect-timeout 15 "
-    local failed=false
+    local wget_options="--tries 20 "
+    # Store options that aren't supported on all wget implementations separately.
+    local wget_options_extra="--waitretry 2 --connect-timeout 15 "
+    local wget_result=''
+
     if [ -z "$out_path" ]; then
-        wget -q $wget_options -O - "$remote_path_with_credential" || failed=true
+        wget -q $wget_options $wget_options_extra -O - "$remote_path_with_credential" 2>&1
+        wget_result=$?
     else
-        wget $wget_options -O "$out_path" "$remote_path_with_credential" || failed=true
+        wget $wget_options $wget_options_extra -O "$out_path" "$remote_path_with_credential" 2>&1
+        wget_result=$?
     fi
-    if [ "$failed" = true ]; then
+
+    if [[ $wget_result == 2 ]]; then
+        # Parsing of the command has failed. Exclude potentially unrecognized options and retry.
+        if [ -z "$out_path" ]; then
+            wget -q $wget_options -O - "$remote_path_with_credential" 2>&1
+            wget_result=$?
+        else
+            wget $wget_options -O "$out_path" "$remote_path_with_credential" 2>&1
+            wget_result=$?
+        fi
+    fi
+
+    if [[ $wget_result != 0 ]]; then
         local disable_feed_credential=false
         local response=$(get_http_header_wget $remote_path $disable_feed_credential)
         http_code=$( echo "$response" | awk '/^  HTTP/{print $2}' | tail -1 )
@@ -1034,10 +1064,11 @@ downloadwget() {
         say_verbose "$download_error_msg"
         return 1
     fi
+
     return 0
 }
 
-get_download_link_from_aka_ms() {    
+get_download_link_from_aka_ms() {
     eval $invocation
 
     #quality is not supported for LTS or current channel
@@ -1090,11 +1121,197 @@ get_download_link_from_aka_ms() {
     fi
 }
 
+get_feeds_to_use()
+{
+    feeds=(
+    "https://dotnetcli.azureedge.net/dotnet"
+    "https://dotnetbuilds.azureedge.net/public"
+    )
+
+    if [[ -n "$azure_feed" ]]; then
+        feeds=("$azure_feed")
+    fi
+
+    if [[ "$no_cdn" == "true" ]]; then
+        feeds=(
+        "https://dotnetcli.blob.core.windows.net/dotnet"
+        "https://dotnetbuilds.blob.core.windows.net/public"
+        )
+
+        if [[ -n "$uncached_feed" ]]; then
+            feeds=("$uncached_feed")
+        fi
+    fi
+}
+
+# THIS FUNCTION MAY EXIT (if the determined version is already installed).
+generate_download_links() {
+
+    download_links=()
+    specific_versions=()
+    effective_versions=()
+    link_types=()
+
+    # If generate_akams_links returns false, no fallback to old links. Just terminate.
+    # This function may also 'exit' (if the determined version is already installed).
+    generate_akams_links || return
+
+    # Check other feeds only if we haven't been able to find an aka.ms link.
+    if [[ "${#download_links[@]}" -lt 1 ]]; then
+        for feed in ${feeds[@]}
+        do
+            # generate_regular_links may also 'exit' (if the determined version is already installed).
+            generate_regular_links $feed || return
+        done
+    fi
+
+    if [[ "${#download_links[@]}" -eq 0 ]]; then
+        say_err "Failed to resolve the exact version number."
+        return 1
+    fi
+
+    say_verbose "Generated ${#download_links[@]} links."
+    for link_index in ${!download_links[@]}
+    do
+        say_verbose "Link $link_index: ${link_types[$link_index]}, ${effective_versions[$link_index]}, ${download_links[$link_index]}"
+    done
+}
+
+# THIS FUNCTION MAY EXIT (if the determined version is already installed).
+generate_akams_links() {
+    local valid_aka_ms_link=true;
+
+    normalized_version="$(to_lowercase "$version")"
+    if [[ -n "$json_file" || "$normalized_version" != "latest" ]]; then
+        # aka.ms links are not needed when exact version is specified via command or json file
+        return
+    fi
+
+    get_download_link_from_aka_ms || valid_aka_ms_link=false
+
+    if [[ "$valid_aka_ms_link" == true ]]; then
+        say_verbose "Retrieved primary payload URL from aka.ms link: '$aka_ms_download_link'."
+        say_verbose "Downloading using legacy url will not be attempted."
+
+        download_link=$aka_ms_download_link
+
+        #get version from the path
+        IFS='/'
+        read -ra pathElems <<< "$download_link"
+        count=${#pathElems[@]}
+        specific_version="${pathElems[count-2]}"
+        unset IFS;
+        say_verbose "Version: '$specific_version'."
+
+        #Retrieve effective version
+        effective_version="$(get_specific_product_version "$azure_feed" "$specific_version" "$download_link")"
+
+        # Add link info to arrays
+        download_links+=($download_link)
+        specific_versions+=($specific_version)
+        effective_versions+=($effective_version)
+        link_types+=("aka.ms")
+
+        #  Check if the SDK version is already installed.
+        if [[ "$dry_run" != true ]] && is_dotnet_package_installed "$install_root" "$asset_relative_path" "$effective_version"; then
+            say "$asset_name with version '$effective_version' is already installed."
+            exit 0
+        fi
+
+        return 0
+    fi
+
+    # if quality is specified - exit with error - there is no fallback approach
+    if [ ! -z "$normalized_quality" ]; then
+        say_err "Failed to locate the latest version in the channel '$normalized_channel' with '$normalized_quality' quality for '$normalized_product', os: '$normalized_os', architecture: '$normalized_architecture'."
+        say_err "Refer to: https://aka.ms/dotnet-os-lifecycle for information on .NET Core support."
+        return 1
+    fi
+    say_verbose "Falling back to latest.version file approach."
+}
+
+# THIS FUNCTION MAY EXIT (if the determined version is already installed)
+# args:
+# feed - $1
+generate_regular_links() {
+    local feed="$1"
+    local valid_legacy_download_link=true
+
+    specific_version=$(get_specific_version_from_version "$feed" "$channel" "$normalized_architecture" "$version" "$json_file") || specific_version='0'
+
+    if [[ "$specific_version" == '0' ]]; then
+        say_verbose "Failed to resolve the specific version number using feed '$feed'"
+        return
+    fi
+
+    effective_version="$(get_specific_product_version "$feed" "$specific_version")"
+    say_verbose "specific_version=$specific_version"
+
+    download_link="$(construct_download_link "$feed" "$channel" "$normalized_architecture" "$specific_version" "$normalized_os")"
+    say_verbose "Constructed primary named payload URL: $download_link"
+
+    # Add link info to arrays
+    download_links+=($download_link)
+    specific_versions+=($specific_version)
+    effective_versions+=($effective_version)
+    link_types+=("primary")
+
+    legacy_download_link="$(construct_legacy_download_link "$feed" "$channel" "$normalized_architecture" "$specific_version")" || valid_legacy_download_link=false
+
+    if [ "$valid_legacy_download_link" = true ]; then
+        say_verbose "Constructed legacy named payload URL: $legacy_download_link"
+    
+        download_links+=($legacy_download_link)
+        specific_versions+=($specific_version)
+        effective_versions+=($effective_version)
+        link_types+=("legacy")
+    else
+        legacy_download_link=""
+        say_verbose "Cound not construct a legacy_download_link; omitting..."
+    fi
+
+    #  Check if the SDK version is already installed.
+    if [[ "$dry_run" != true ]] && is_dotnet_package_installed "$install_root" "$asset_relative_path" "$effective_version"; then
+        say "$asset_name with version '$effective_version' is already installed."
+        exit 0
+    fi
+}
+
+print_dry_run() {
+
+    say "Payload URLs:"
+
+    for link_index in "${!download_links[@]}"
+        do
+            say "URL #$link_index - ${link_types[$link_index]}: ${download_links[$link_index]}"
+    done
+
+    resolved_version=${specific_versions[0]}
+    repeatable_command="./$script_name --version "\""$resolved_version"\"" --install-dir "\""$install_root"\"" --architecture "\""$normalized_architecture"\"" --os "\""$normalized_os"\"""
+    
+    if [ ! -z "$normalized_quality" ]; then
+        repeatable_command+=" --quality "\""$normalized_quality"\"""
+    fi
+
+    if [[ "$runtime" == "dotnet" ]]; then
+        repeatable_command+=" --runtime "\""dotnet"\"""
+    elif [[ "$runtime" == "aspnetcore" ]]; then
+        repeatable_command+=" --runtime "\""aspnetcore"\"""
+    fi
+
+    repeatable_command+="$non_dynamic_parameters"
+
+    if [ -n "$feed_credential" ]; then
+        repeatable_command+=" --feed-credential "\""<feed_credential>"\"""
+    fi
+
+    say "Repeatable invocation: $repeatable_command"
+}
+
 calculate_vars() {
     eval $invocation
-    valid_legacy_download_link=true
 
-    #normalize input variables
+    script_name=$(basename "$0")
     normalized_architecture="$(get_normalized_architecture_from_architecture "$architecture")"
     say_verbose "Normalized architecture: '$normalized_architecture'."
     normalized_os="$(get_normalized_os "$user_defined_os")"
@@ -1105,76 +1322,8 @@ calculate_vars() {
     say_verbose "Normalized channel: '$normalized_channel'."
     normalized_product="$(get_normalized_product "$runtime")"
     say_verbose "Normalized product: '$normalized_product'."
-
-    #try to get download location from aka.ms link
-    #not applicable when exact version is specified via command or json file
-    normalized_version="$(to_lowercase "$version")"
-    if [[ -z "$json_file" && "$normalized_version" == "latest" ]]; then
-
-            valid_aka_ms_link=true;
-            get_download_link_from_aka_ms || valid_aka_ms_link=false
-            
-            if [ "$valid_aka_ms_link" == false ]; then
-                # if quality is specified - exit with error - there is no fallback approach
-                if [ ! -z "$normalized_quality" ]; then
-                    say_err "Failed to locate the latest version in the channel '$normalized_channel' with '$normalized_quality' quality for '$normalized_product', os: '$normalized_os', architecture: '$normalized_architecture'."
-                    say_err "Refer to: https://aka.ms/dotnet-os-lifecycle for information on .NET Core support."
-                    return 1
-                fi
-                say_verbose "Falling back to latest.version file approach."
-            else
-                say_verbose "Retrieved primary payload URL from aka.ms link: '$aka_ms_download_link'."
-                download_link=$aka_ms_download_link
-
-                say_verbose "Downloading using legacy url will not be attempted."
-                valid_legacy_download_link=false
-
-                #get version from the path
-                IFS='/'
-                read -ra pathElems <<< "$download_link"
-                count=${#pathElems[@]}
-                specific_version="${pathElems[count-2]}"
-                unset IFS;
-                say_verbose "Version: '$specific_version'."
-
-                #Retrieve product specific version
-                specific_product_version="$(get_specific_product_version "$azure_feed" "$specific_version" "$download_link")"
-                say_verbose "Product specific version: '$specific_product_version'."
-  
-                install_root="$(resolve_installation_path "$install_dir")"
-                say_verbose "InstallRoot: '$install_root'."
-                return 
-            fi
-    fi
-
-    specific_version="$(get_specific_version_from_version "$azure_feed" "$channel" "$normalized_architecture" "$version" "$json_file")"
-    specific_product_version="$(get_specific_product_version "$azure_feed" "$specific_version")"
-    say_verbose "specific_version=$specific_version"
-    if [ -z "$specific_version" ]; then
-        say_err "Could not resolve version information."
-        return 1
-    fi
-
-    download_link="$(construct_download_link "$azure_feed" "$channel" "$normalized_architecture" "$specific_version" "$normalized_os")"
-    say_verbose "Constructed primary named payload URL: $download_link"
-
-    legacy_download_link="$(construct_legacy_download_link "$azure_feed" "$channel" "$normalized_architecture" "$specific_version")" || valid_legacy_download_link=false
-
-    if [ "$valid_legacy_download_link" = true ]; then
-        say_verbose "Constructed legacy named payload URL: $legacy_download_link"
-    else
-        say_verbose "Cound not construct a legacy_download_link; omitting..."
-    fi
-
     install_root="$(resolve_installation_path "$install_dir")"
-    say_verbose "InstallRoot: $install_root"
-}
-
-install_dotnet() {
-    eval $invocation
-    local download_failed=false
-    local asset_name=''
-    local asset_relative_path=''
+    say_verbose "InstallRoot: '$install_root'."
 
     if [[ "$runtime" == "dotnet" ]]; then
         asset_relative_path="shared/Microsoft.NETCore.App"
@@ -1185,84 +1334,52 @@ install_dotnet() {
     elif [ -z "$runtime" ]; then
         asset_relative_path="sdk"
         asset_name=".NET Core SDK"
-    else
-        say_err "Invalid value for \$runtime"
-        return 1
     fi
 
-    #  Check if the SDK version is already installed.
-    if is_dotnet_package_installed "$install_root" "$asset_relative_path" "$specific_version"; then
-        say "$asset_name version $specific_version is already installed."
-        return 0
-    fi
+    get_feeds_to_use
+}
+
+install_dotnet() {
+    eval $invocation
+    local download_failed=false
+    local download_completed=false
 
     mkdir -p "$install_root"
     zip_path="$(mktemp "$temporary_file_template")"
     say_verbose "Zip path: $zip_path"
 
+    for link_index in "${!download_links[@]}"
+    do
+        download_link="${download_links[$link_index]}"
+        specific_version="${specific_versions[$link_index]}"
+        effective_version="${effective_versions[$link_index]}"
+        link_type="${link_types[$link_index]}"
 
-    # Failures are normal in the non-legacy case for ultimately legacy downloads.
-    # Do not output to stderr, since output to stderr is considered an error.
-    say "Downloading primary link $download_link"
+        say "Attempting to download using $link_type link $download_link"
 
-    # The download function will set variables $http_code and $download_error_msg in case of failure.
-    download "$download_link" "$zip_path" 2>&1 || download_failed=true
+        # The download function will set variables $http_code and $download_error_msg in case of failure.
+        download_failed=false
+        download "$download_link" "$zip_path" 2>&1 || download_failed=true
 
-    #  if the download fails, download the legacy_download_link
-    if [ "$download_failed" = true ]; then
-        primary_path_http_code="$http_code"; primary_path_download_error_msg="$download_error_msg"
-        case $primary_path_http_code in
-        404)
-            say "The resource at $download_link is not available."
-            ;;
-        *)
-            say "$primary_path_download_error_msg"
-            ;;
-        esac
-        rm -f "$zip_path" 2>&1 && say_verbose "Temporary zip file $zip_path was removed"
-        if [ "$valid_legacy_download_link" = true ]; then
-            download_failed=false
-            download_link="$legacy_download_link"
-            zip_path="$(mktemp "$temporary_file_template")"
-            say_verbose "Legacy zip path: $zip_path"
-
-            say "Downloading legacy link $download_link"
-
-            # The download function will set variables $http_code and $download_error_msg in case of failure.
-            download "$download_link" "$zip_path" 2>&1 || download_failed=true
-
-            if [ "$download_failed" = true ]; then
-                legacy_path_http_code="$http_code";  legacy_path_download_error_msg="$download_error_msg"
-                case $legacy_path_http_code in
-                404)
-                    say "The resource at $download_link is not available."
-                    ;;
-                *)
-                    say "$legacy_path_download_error_msg"
-                    ;;
-                esac
-                rm -f "$zip_path" 2>&1 && say_verbose "Temporary zip file $zip_path was removed"
-            fi
-        fi
-    fi
-
-    if [ "$download_failed" = true ]; then
-        if [[ "$primary_path_http_code" = "404" && ( "$valid_legacy_download_link" = false || "$legacy_path_http_code" = "404") ]]; then
-            say_err "Could not find \`$asset_name\` with version = $specific_version"
-            say_err "Refer to: https://aka.ms/dotnet-os-lifecycle for information on .NET Core support"
+        if [ "$download_failed" = true ]; then
+            case $http_code in
+            404)
+                say "The resource at $link_type link '$download_link' is not available."
+                ;;
+            *)
+                say "Failed to download $link_type link '$download_link': $download_error_msg"
+                ;;
+            esac
+            rm -f "$zip_path" 2>&1 && say_verbose "Temporary zip file $zip_path was removed"
         else
-            say_err "Could not download: \`$asset_name\` with version = $specific_version"
-            # 404-NotFound is an expected response if it goes from only one of the links, do not show that error.
-            # If primary path is available (not 404-NotFound) then show the primary error else show the legacy error.
-            if [ "$primary_path_http_code" != "404" ]; then
-                say_err "$primary_path_download_error_msg"
-                return 1
-            fi
-            if [[ "$valid_legacy_download_link" = true  && "$legacy_path_http_code" != "404" ]]; then
-                say_err "$legacy_path_download_error_msg"
-                return 1
-            fi
+            download_completed=true
+            break
         fi
+    done
+
+    if [[ "$download_completed" == false ]]; then
+        say_err "Could not find \`$asset_name\` with version = $specific_version"
+        say_err "Refer to: https://aka.ms/dotnet-os-lifecycle for information on .NET Core support"
         return 1
     fi
 
@@ -1283,14 +1400,14 @@ install_dotnet() {
     fi
 
     #  Check if the standard SDK version is installed.
-    say_verbose "Checking installation: version = $specific_product_version"
-    if is_dotnet_package_installed "$install_root" "$asset_relative_path" "$specific_product_version"; then
+    say_verbose "Checking installation: version = $effective_version"
+    if is_dotnet_package_installed "$install_root" "$asset_relative_path" "$effective_version"; then
         return 0
     fi
 
     # Version verification failed. More likely something is wrong either with the downloaded content or with the verification algorithm.
     say_err "Failed to verify the version of installed \`$asset_name\`.\nInstallation source: $download_link.\nInstallation location: $install_root.\nReport the bug at https://github.com/dotnet/install-scripts/issues."
-    say_err "\`$asset_name\` with version = $specific_product_version failed to install with an unknown error."
+    say_err "\`$asset_name\` with version = $effective_version failed to install with an error."
     return 1
 }
 
@@ -1308,8 +1425,8 @@ architecture="<auto>"
 dry_run=false
 no_path=false
 no_cdn=false
-azure_feed="https://dotnetcli.azureedge.net/dotnet"
-uncached_feed="https://dotnetcli.blob.core.windows.net/dotnet"
+azure_feed=""
+uncached_feed=""
 feed_credential=""
 verbose=false
 runtime=""
@@ -1434,7 +1551,7 @@ do
             echo "          - 3-part version in a format A.B.Cxx - represents a specific SDK release"
             echo "              examples: 5.0.1xx, 5.0.2xx."
             echo "              Supported since 5.0 release"
-            echo "          Note: The version parameter overrides the channel parameter when any version other than `latest` is used."
+            echo "          Note: The version parameter overrides the channel parameter when any version other than 'latest' is used."
             echo "  -v,--version <VERSION>         Use specific VERSION, Defaults to \`$version\`."
             echo "      -Version"
             echo "          Possible values:"
@@ -1447,7 +1564,7 @@ do
             echo "          Works only in combination with channel. Not applicable for current and LTS channels and will be ignored if those channels are used." 
             echo "          For SDK use channel in A.B.Cxx format. Using quality for SDK together with channel in A.B format is not supported." 
             echo "          Supported since 5.0 release." 
-            echo "          Note: The version parameter overrides the channel parameter when any version other than `latest` is used, and therefore overrides the quality."
+            echo "          Note: The version parameter overrides the channel parameter when any version other than 'latest' is used, and therefore overrides the quality."
             echo "  --internal,-Internal               Download internal builds. Requires providing credentials via --feed-credential parameter."
             echo "  --feed-credential <FEEDCREDENTIAL> Token to access Azure feed. Used as a query string to append to the Azure feed."
             echo "      -FeedCredential                This parameter typically is not specified."
@@ -1469,8 +1586,12 @@ do
             echo "  --dry-run,-DryRun                  Do not perform installation. Display download link."
             echo "  --no-path, -NoPath                 Do not set PATH for the current process."
             echo "  --verbose,-Verbose                 Display diagnostics information."
-            echo "  --azure-feed,-AzureFeed            Azure feed location. Defaults to $azure_feed, This parameter typically is not changed by the user."
-            echo "  --uncached-feed,-UncachedFeed      Uncached feed location. This parameter typically is not changed by the user."
+            echo "  --azure-feed,-AzureFeed            For internal use only."
+            echo "                                     Allows using a different storage to download SDK archives from."
+            echo "                                     This parameter is only used if --no-cdn is false."
+            echo "  --uncached-feed,-UncachedFeed      For internal use only."
+            echo "                                     Allows using a different storage to download SDK archives from."
+            echo "                                     This parameter is only used if --no-cdn is true."
             echo "  --skip-non-versioned-files         Skips non-versioned files if they already exist, such as the dotnet executable."
             echo "      -SkipNonVersionedFiles"
             echo "  --no-cdn,-NoCdn                    Disable downloading from the Azure CDN, and use the uncached feed directly."
@@ -1478,14 +1599,6 @@ do
             echo "                                     Note: global.json must have a value for 'SDK:Version'"
             echo "  -?,--?,-h,--help,-Help             Shows this help message"
             echo ""
-            echo "Obsolete parameters:"
-            echo "  --shared-runtime                   The recommended alternative is '--runtime dotnet'."
-            echo "                                     This parameter is obsolete and may be removed in a future version of this script."
-            echo "                                     Installs just the shared runtime bits, not the entire SDK."
-            echo "  --runtime-id                       Installs the .NET Tools for the given platform (use linux-x64 for portable linux)."
-            echo "      -RuntimeId"                    The parameter is obsolete and may be removed in a future version of this script. Should be used only for versions below 2.1.
-            echo "                                     For primary links to override OS or/and architecture, use --os and --architecture option instead."
-            echo ""
             echo "Install Location:"
             echo "  Location is chosen in following order:"
             echo "    - --install-dir option"
@@ -1502,10 +1615,6 @@ do
     shift
 done
 
-if [ "$no_cdn" = true ]; then
-    azure_feed="$uncached_feed"
-fi
-
 say "Note that the intended use of this script is for Continuous Integration (CI) scenarios, where:"
 say "- The SDK needs to be installed without user interaction and without admin rights."
 say "- The SDK installation doesn't need to persist across multiple CI runs."
@@ -1523,33 +1632,11 @@ fi
 
 check_min_reqs
 calculate_vars
-script_name=$(basename "$0")
+# generate_regular_links call below will 'exit' if the determined version is already installed.
+generate_download_links
 
-if [ "$dry_run" = true ]; then
-    say "Payload URLs:"
-    say "Primary named payload URL: ${download_link}"
-    if [ "$valid_legacy_download_link" = true ]; then
-        say "Legacy named payload URL: ${legacy_download_link}"
-    fi
-    repeatable_command="./$script_name --version "\""$specific_version"\"" --install-dir "\""$install_root"\"" --architecture "\""$normalized_architecture"\"" --os "\""$normalized_os"\"""
-    
-    if [ ! -z "$normalized_quality" ]; then
-        repeatable_command+=" --quality "\""$normalized_quality"\"""
-    fi
-
-    if [[ "$runtime" == "dotnet" ]]; then
-        repeatable_command+=" --runtime "\""dotnet"\"""
-    elif [[ "$runtime" == "aspnetcore" ]]; then
-        repeatable_command+=" --runtime "\""aspnetcore"\"""
-    fi
-
-    repeatable_command+="$non_dynamic_parameters"
-
-    if [ -n "$feed_credential" ]; then
-        repeatable_command+=" --feed-credential "\""<feed_credential>"\"""
-    fi
-
-    say "Repeatable invocation: $repeatable_command"
+if [[ "$dry_run" = true ]]; then
+    print_dry_run
     exit 0
 fi