Update installer scripts

externals/install-dotnet.ps1

@@ -23,8 +23,6 @@
     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
@@ -122,24 +120,42 @@ $VersionRegEx="/\d+\.\d+[^/]+/"
 $OverrideNonVersionedFiles = !$SkipNonVersionedFiles
 
 function Say($str) {
-    try
+    try {
-    {
         Write-Host "dotnet-install: $str"
     }
-    catch
+    catch {
-    {
         # Some platforms cannot utilize Write-Host (Azure Functions, for instance). Fall back to Write-Output
         Write-Output "dotnet-install: $str"
     }
 }
 
+function Say-Warning($str) {
+    try {
+        Write-Warning "dotnet-install: $str"
+    }
+    catch {
+        # Some platforms cannot utilize Write-Warning (Azure Functions, for instance). Fall back to Write-Output
+        Write-Output "dotnet-install: Warning: $str"
+    }
+}
+
+# Writes a line with error style settings.
+# Use this function to show a human-readable comment along with an exception.
+function Say-Error($str) {
+    try {
+        # Write-Error is quite oververbose for the purpose of the function, let's write one line with error style settings.
+        $Host.UI.WriteErrorLine("dotnet-install: $str")
+    }
+    catch {
+        Write-Output "dotnet-install: Error: $str"
+    }
+}
+
 function Say-Verbose($str) {
-    try
+    try {
-    {
         Write-Verbose "dotnet-install: $str"
     }
-    catch
+    catch {
-    {
         # Some platforms cannot utilize Write-Verbose (Azure Functions, for instance). Fall back to Write-Output
         Write-Output "dotnet-install: $str"
     }
@@ -156,7 +172,7 @@ function Invoke-With-Retry([ScriptBlock]$ScriptBlock, [int]$MaxAttempts = 3, [in
 
     while ($true) {
         try {
-            return $ScriptBlock.Invoke()
+            return & $ScriptBlock
         }
         catch {
             $Attempts++
@@ -195,7 +211,7 @@ function Get-CLIArchitecture-From-Architecture([string]$Architecture) {
         { $_ -eq "x86" } { return "x86" }
         { $_ -eq "arm" } { return "arm" }
         { $_ -eq "arm64" } { return "arm64" }
-        default { throw "Architecture not supported. If you think this is a bug, report it at https://github.com/dotnet/sdk/issues" }
+        default { throw "Architecture '$Architecture' not supported. If you think this is a bug, report it at https://github.com/dotnet/install-scripts/issues" }
     }
 }
 
@@ -270,19 +286,42 @@ function GetHTTPResponse([Uri] $Uri)
             # 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
+            $Task = $HttpClient.GetAsync("${Uri}${FeedCredential}").ConfigureAwait("false");
-            if (($Response -eq $null) -or (-not ($Response.IsSuccessStatusCode))) {
+            $Response = $Task.GetAwaiter().GetResult();
+
+            if (($null -eq $Response) -or (-not ($Response.IsSuccessStatusCode))) {
                 # The feed credential is potentially sensitive info. Do not log FeedCredential to console output.
-                $ErrorMsg = "Failed to download $Uri."
+                $DownloadException = [System.Exception] "Unable to download $Uri."
-                if ($Response -ne $null) {
+
-                    $ErrorMsg += "  $Response"
+                if ($null -ne $Response) {
+                    $DownloadException.Data["StatusCode"] = [int] $Response.StatusCode
+                    $DownloadException.Data["ErrorMessage"] = "Unable to download $Uri. Returned HTTP status code: " + $DownloadException.Data["StatusCode"]
                 }
 
-                throw $ErrorMsg
+                throw $DownloadException
             }
 
             return $Response
         }
+        catch [System.Net.Http.HttpRequestException] {
+            $DownloadException = [System.Exception] "Unable to download $Uri."
+
+            # Pick up the exception message and inner exceptions' messages if they exist
+            $CurrentException = $PSItem.Exception
+            $ErrorMsg = $CurrentException.Message + "`r`n"
+            while ($CurrentException.InnerException) {
+              $CurrentException = $CurrentException.InnerException
+              $ErrorMsg += $CurrentException.Message + "`r`n"
+            }
+
+            # Check if there is an issue concerning TLS.
+            if ($ErrorMsg -like "*SSL/TLS*") {
+                $ErrorMsg += "Ensure that TLS 1.2 or higher is enabled to use this script.`r`n"
+            }
+
+            $DownloadException.Data["ErrorMessage"] = $ErrorMsg
+            throw $DownloadException
+        }
         finally {
              if ($HttpClient -ne $null) {
                 $HttpClient.Dispose()
@@ -291,7 +330,7 @@ function GetHTTPResponse([Uri] $Uri)
     })
 }
 
-function Get-Latest-Version-Info([string]$AzureFeed, [string]$Channel, [bool]$Coherent) {
+function Get-Latest-Version-Info([string]$AzureFeed, [string]$Channel) {
     Say-Invocation $MyInvocation
 
     $VersionFileUrl = $null
@@ -306,13 +345,8 @@ function Get-Latest-Version-Info([string]$AzureFeed, [string]$Channel, [bool]$Co
         $VersionFileUrl = "$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"
     }
@@ -320,7 +354,8 @@ function Get-Latest-Version-Info([string]$AzureFeed, [string]$Channel, [bool]$Co
         $Response = GetHTTPResponse -Uri $VersionFileUrl
     }
     catch {
-        throw "Could not resolve version information."
+        Say-Error "Could not resolve version information."
+        throw
     }
     $StringContent = $Response.Content.ReadAsStringAsync().Result
 
@@ -346,7 +381,8 @@ function Parse-Jsonfile-For-Version([string]$JSonFile) {
         $JSonContent = Get-Content($JSonFile) -Raw | ConvertFrom-Json | Select-Object -expand "sdk" -ErrorAction SilentlyContinue
     }
     catch {
-        throw "Json file unreadable: '$JSonFile'"
+        Say-Error "Json file unreadable: '$JSonFile'"
+        throw
     }
     if ($JSonContent) {
         try {
@@ -359,7 +395,8 @@ function Parse-Jsonfile-For-Version([string]$JSonFile) {
             }
         }
         catch {
-            throw "Unable to parse the SDK node in '$JSonFile'"
+            Say-Error "Unable to parse the SDK node in '$JSonFile'"
+            throw
         }
     }
     else {
@@ -375,16 +412,12 @@ function Get-Specific-Version-From-Version([string]$AzureFeed, [string]$Channel,
     Say-Invocation $MyInvocation
 
     if (-not $JSonFile) {
-        switch ($Version.ToLower()) {
+        if ($Version.ToLower() -eq "latest") {
-            { $_ -eq "latest" } {
+            $LatestVersionInfo = Get-Latest-Version-Info -AzureFeed $AzureFeed -Channel $Channel
-                $LatestVersionInfo = Get-Latest-Version-Info -AzureFeed $AzureFeed -Channel $Channel -Coherent $False
             return $LatestVersionInfo.Version
         }
-            { $_ -eq "coherent" } {
+        else {
-                $LatestVersionInfo = Get-Latest-Version-Info -AzureFeed $AzureFeed -Channel $Channel -Coherent $True
+            return $Version 
-                return $LatestVersionInfo.Version
-            }
-            default { return $Version }
         }
     }
     else {
@@ -395,17 +428,20 @@ function Get-Specific-Version-From-Version([string]$AzureFeed, [string]$Channel,
 function Get-Download-Link([string]$AzureFeed, [string]$SpecificVersion, [string]$CLIArchitecture) {
     Say-Invocation $MyInvocation
 
+    # If anything fails in this lookup it will default to $SpecificVersion
+    $SpecificProductVersion = Get-Product-Version -AzureFeed $AzureFeed -SpecificVersion $SpecificVersion
+
     if ($Runtime -eq "dotnet") {
-        $PayloadURL = "$AzureFeed/Runtime/$SpecificVersion/dotnet-runtime-$SpecificVersion-win-$CLIArchitecture.zip"
+        $PayloadURL = "$AzureFeed/Runtime/$SpecificVersion/dotnet-runtime-$SpecificProductVersion-win-$CLIArchitecture.zip"
     }
     elseif ($Runtime -eq "aspnetcore") {
-        $PayloadURL = "$AzureFeed/aspnetcore/Runtime/$SpecificVersion/aspnetcore-runtime-$SpecificVersion-win-$CLIArchitecture.zip"
+        $PayloadURL = "$AzureFeed/aspnetcore/Runtime/$SpecificVersion/aspnetcore-runtime-$SpecificProductVersion-win-$CLIArchitecture.zip"
     }
     elseif ($Runtime -eq "windowsdesktop") {
-        $PayloadURL = "$AzureFeed/Runtime/$SpecificVersion/windowsdesktop-runtime-$SpecificVersion-win-$CLIArchitecture.zip"
+        $PayloadURL = "$AzureFeed/Runtime/$SpecificVersion/windowsdesktop-runtime-$SpecificProductVersion-win-$CLIArchitecture.zip"
     }
     elseif (-not $Runtime) {
-        $PayloadURL = "$AzureFeed/Sdk/$SpecificVersion/dotnet-sdk-$SpecificVersion-win-$CLIArchitecture.zip"
+        $PayloadURL = "$AzureFeed/Sdk/$SpecificVersion/dotnet-sdk-$SpecificProductVersion-win-$CLIArchitecture.zip"
     }
     else {
         throw "Invalid value for `$Runtime"
@@ -413,7 +449,7 @@ function Get-Download-Link([string]$AzureFeed, [string]$SpecificVersion, [string
 
     Say-Verbose "Constructed primary named payload URL: $PayloadURL"
 
-    return $PayloadURL
+    return $PayloadURL, $SpecificProductVersion
 }
 
 function Get-LegacyDownload-Link([string]$AzureFeed, [string]$SpecificVersion, [string]$CLIArchitecture) {
@@ -434,6 +470,51 @@ function Get-LegacyDownload-Link([string]$AzureFeed, [string]$SpecificVersion, [
     return $PayloadURL
 }
 
+function Get-Product-Version([string]$AzureFeed, [string]$SpecificVersion) {
+    Say-Invocation $MyInvocation
+
+    if ($Runtime -eq "dotnet") {
+        $ProductVersionTxtURL = "$AzureFeed/Runtime/$SpecificVersion/productVersion.txt"
+    }
+    elseif ($Runtime -eq "aspnetcore") {
+        $ProductVersionTxtURL = "$AzureFeed/aspnetcore/Runtime/$SpecificVersion/productVersion.txt"
+    }
+    elseif ($Runtime -eq "windowsdesktop") {
+        $ProductVersionTxtURL = "$AzureFeed/Runtime/$SpecificVersion/productVersion.txt"
+    }
+    elseif (-not $Runtime) {
+        $ProductVersionTxtURL = "$AzureFeed/Sdk/$SpecificVersion/productVersion.txt"
+    }
+    else {
+        throw "Invalid value '$Runtime' specified for `$Runtime"
+    }
+
+    Say-Verbose "Checking for existence of $ProductVersionTxtURL"
+
+    try {
+        $productVersionResponse = GetHTTPResponse($productVersionTxtUrl)
+
+        if ($productVersionResponse.StatusCode -eq 200) {
+            $productVersion = $productVersionResponse.Content.ReadAsStringAsync().Result.Trim()
+            if ($productVersion -ne $SpecificVersion)
+            {
+                Say "Using alternate version $productVersion found in $ProductVersionTxtURL"
+            }
+
+            return $productVersion
+        }
+        else {
+            Say-Verbose "Got StatusCode $($productVersionResponse.StatusCode) trying to get productVersion.txt at $productVersionTxtUrl, so using default value of $SpecificVersion"
+            $productVersion = $SpecificVersion
+        }
+    } catch {
+        Say-Verbose "Could not read productVersion.txt at $productVersionTxtUrl, so using default value of $SpecificVersion (Exception: '$($_.Exception.Message)' )"
+        $productVersion = $SpecificVersion
+    }
+
+    return $productVersion
+}
+
 function Get-User-Share-Path() {
     Say-Invocation $MyInvocation
 
@@ -571,6 +652,23 @@ function DownloadFile($Source, [string]$OutPath) {
     }
 }
 
+function SafeRemoveFile($Path) {
+    try {
+        if (Test-Path $Path) {
+            Remove-Item $Path
+            Say-Verbose "The temporary file `"$Path`" was removed."
+        }
+        else
+        {
+            Say-Verbose "The temporary file `"$Path`" does not exist, therefore is not removed."
+        }
+    }
+    catch
+    {
+        Say-Warning "Failed to remove the temporary file: `"$Path`", remove it manually."
+    }
+}
+
 function Prepend-Sdk-InstallRoot-To-Path([string]$InstallRoot, [string]$BinFolderRelativePath) {
     $BinPath = Get-Absolute-Path $(Join-Path -Path $InstallRoot -ChildPath $BinFolderRelativePath)
     if (-Not $NoPath) {
@@ -587,9 +685,14 @@ function Prepend-Sdk-InstallRoot-To-Path([string]$InstallRoot, [string]$BinFolde
     }
 }
 
+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"
+
 $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 $CLIArchitecture
+$DownloadLink, $EffectiveVersion = Get-Download-Link -AzureFeed $AzureFeed -SpecificVersion $SpecificVersion -CLIArchitecture $CLIArchitecture
 $LegacyDownloadLink = Get-LegacyDownload-Link -AzureFeed $AzureFeed -SpecificVersion $SpecificVersion -CLIArchitecture $CLIArchitecture
 
 $InstallRoot = Resolve-Installation-Path $InstallDir
@@ -615,7 +718,12 @@ if ($DryRun) {
         }
     }
     Say "Repeatable invocation: $RepeatableCommand"
-    exit 0
+    if ($SpecificVersion -ne $EffectiveVersion)
+    {
+        Say "NOTE: Due to finding a version manifest with this runtime, it would actually install with version '$EffectiveVersion'"
+    }
+
+    return
 }
 
 if ($Runtime -eq "dotnet") {
@@ -638,12 +746,18 @@ else {
     throw "Invalid value for `$Runtime"
 }
 
+if ($SpecificVersion -ne $EffectiveVersion)
+{
+   Say "Performing installation checks for effective version: $EffectiveVersion"
+   $SpecificVersion = $EffectiveVersion
+}
+
 #  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
+    return
 }
 
 New-Item -ItemType Directory -Force -Path $InstallRoot | Out-Null
@@ -651,30 +765,69 @@ 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}:"
+    throw "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: $DownloadLink"
+
+$PrimaryDownloadStatusCode = 0
+$LegacyDownloadStatusCode = 0
+
+$PrimaryDownloadFailedMsg = ""
+$LegacyDownloadFailedMsg = ""
+
+Say "Downloading primary link $DownloadLink"
 try {
     DownloadFile -Source $DownloadLink -OutPath $ZipPath
 }
 catch {
-    Say "Cannot download: $DownloadLink"
+    if ($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
+    }
+
+    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"
+        Say "Downloading legacy link $DownloadLink"
         try {
             DownloadFile -Source $DownloadLink -OutPath $ZipPath
         }
         catch {
-            Say "Cannot download: $DownloadLink"
+            if ($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
         }
     }
@@ -684,7 +837,19 @@ catch {
 }
 
 if ($DownloadFailed) {
-    throw "Could not find/download: `"$assetName`" with version = $SpecificVersion`nRefer to: https://aka.ms/dotnet-os-lifecycle for information on .NET Core support"
+    if (($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"
+    }
 }
 
 Say "Extracting zip from $DownloadLink"
@@ -706,206 +871,208 @@ if (!$isAssetInstalled) {
     $isAssetInstalled = Is-Dotnet-Package-Installed -InstallRoot $InstallRoot -RelativePathToPackage $dotnetPackageRelativePath -SpecificVersion $SpecificVersion
 }
 
+# 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."
 }
 
-Remove-Item $ZipPath
+SafeRemoveFile -Path $ZipPath
 
 Prepend-Sdk-InstallRoot-To-Path -InstallRoot $InstallRoot -BinFolderRelativePath $BinFolderRelativePath
 
+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"
-exit 0
-
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+# u5ZH4TCBmDCBgKR+MHwxCzAJBgNVBAYTAlVTMRMwEQYDVQQIEwpXYXNoaW5ndG9u
+# MRAwDgYDVQQHEwdSZWRtb25kMR4wHAYDVQQKExVNaWNyb3NvZnQgQ29ycG9yYXRp
+# b24xJjAkBgNVBAMTHU1pY3Jvc29mdCBUaW1lLVN0YW1wIFBDQSAyMDEwAhMzAAAB
+# LCKvRZd1+RvuAAAAAAEsMCIEINBRtGID6jvA2ptfwIuPyG7qPcLRYb9YrJ8aKfVg
+# TulFMA0GCSqGSIb3DQEBCwUABIIBACQQpFGWW6JmH5MTKwhaE/8+gyzI2bT8XJnA
+# t8k7PHFvEGA7whgp9eNgW+wWJm1gnsmswjx2l7FW4DLg9lghM8FK77JRCg7CJfse
+# dSbnTv81/4VhSXOAO0jMP2dALP7DF59vQmlDh50u8/Wu61ActMOt6cArkoUhBRXO
+# LnqOQCOEEku5Xy2ES9g9eUfLUvTvlWo6HiAq+cJnNV08QRBOnGWRxdwy8YJ5vwNW
+# Pwx0ZG3rTvMtGzOaW6Ve5O36H2ynoEdzCmpakeDaF2sZ86/LNERKyIXiykV/Uig1
+# SZh2VLY/Yni9SCVHbYgvTOCh5ZZE5eOi6BwLf0T4xl5alHUx+AA=
 # SIG # End signature block

externals/install-dotnet.sh

@@ -40,7 +40,7 @@ if [ -t 1 ] && command -v tput > /dev/null; then
 fi
 
 say_warning() {
-    printf "%b\n" "${yellow:-}dotnet_install: Warning: $1${normal:-}"
+    printf "%b\n" "${yellow:-}dotnet_install: Warning: $1${normal:-}" >&3
 }
 
 say_err() {
@@ -183,6 +183,9 @@ get_current_os_name() {
         elif is_musl_based_distro; then
             echo "linux-musl"
             return 0
+        elif [ "$linux_platform_name" = "linux-musl" ]; then
+            echo "linux-musl"
+            return 0
         else
             echo "linux"
             return 0
@@ -241,42 +244,6 @@ check_min_reqs() {
     return 0
 }
 
-check_pre_reqs() {
-    eval $invocation
-
-    if [ "${DOTNET_INSTALL_SKIP_PREREQS:-}" = "1" ]; then
-        return 0
-    fi
-
-    if [ "$(uname)" = "Linux" ]; then
-        if is_musl_based_distro; then
-            if ! command -v scanelf > /dev/null; then
-                say_warning "scanelf not found, please install pax-utils package."
-                return 0
-            fi
-            LDCONFIG_COMMAND="scanelf --ldpath -BF '%f'"
-            [ -z "$($LDCONFIG_COMMAND 2>/dev/null | grep libintl)" ] && say_warning "Unable to locate libintl. Probable prerequisite missing; install libintl (or gettext)."
-        else
-            if [ ! -x "$(command -v ldconfig)" ]; then
-                say_verbose "ldconfig is not in PATH, trying /sbin/ldconfig."
-                LDCONFIG_COMMAND="/sbin/ldconfig"
-            else
-                LDCONFIG_COMMAND="ldconfig"
-            fi
-            local librarypath=${LD_LIBRARY_PATH:-}
-            LDCONFIG_COMMAND="$LDCONFIG_COMMAND -NXv ${librarypath//:/ }"
-        fi
-
-        [ -z "$($LDCONFIG_COMMAND 2>/dev/null | grep zlib)" ] && say_warning "Unable to locate zlib. Probable prerequisite missing; install zlib."
-        [ -z "$($LDCONFIG_COMMAND 2>/dev/null | grep ssl)" ] && say_warning "Unable to locate libssl. Probable prerequisite missing; install libssl."
-        [ -z "$($LDCONFIG_COMMAND 2>/dev/null | grep libicu)" ] && say_warning "Unable to locate libicu. Probable prerequisite missing; install libicu."
-        [ -z "$($LDCONFIG_COMMAND 2>/dev/null | grep lttng)" ] && say_warning "Unable to locate liblttng. Probable prerequisite missing; install libcurl."
-        [ -z "$($LDCONFIG_COMMAND 2>/dev/null | grep libcurl)" ] && say_warning "Unable to locate libcurl. Probable prerequisite missing; install libcurl."
-    fi
-
-    return 0
-}
-
 # args:
 # input - $1
 to_lowercase() {
@@ -332,7 +299,7 @@ get_machine_architecture() {
     if command -v uname > /dev/null; then
         CPUName=$(uname -m)
         case $CPUName in
-        armv7l)
+        armv*l)
             echo "arm"
             return 0
             ;;
@@ -373,10 +340,34 @@ get_normalized_architecture_from_architecture() {
             ;;
     esac
 
-    say_err "Architecture \`$architecture\` not supported. If you think this is a bug, report it at https://github.com/dotnet/sdk/issues"
+    say_err "Architecture \`$architecture\` not supported. If you think this is a bug, report it at https://github.com/dotnet/install-scripts/issues"
     return 1
 }
 
+# args:
+# user_defined_os - $1
+get_normalized_os() {
+    eval $invocation
+
+    local osname="$(to_lowercase "$1")"
+    if [ ! -z "$osname" ]; then
+        case "$osname" in
+            osx | freebsd | rhel.6 | linux-musl | linux)
+                echo "$osname"
+                return 0
+                ;;
+            *)
+                say_err "'$user_defined_os' is not a supported value for --os option, supported values are: osx, linux, linux-musl, freebsd, rhel.6. If you think this is a bug, report it at https://github.com/dotnet/install-scripts/issues."
+                return 1
+                ;;
+        esac
+    else
+        osname="$(get_current_os_name)" || return 1
+    fi
+    echo "$osname"
+    return 0
+}
+
 # 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
@@ -418,14 +409,12 @@ is_dotnet_package_installed() {
 # azure_feed - $1
 # channel - $2
 # normalized_architecture - $3
-# coherent - $4
 get_latest_version_info() {
     eval $invocation
 
     local azure_feed="$1"
     local channel="$2"
     local normalized_architecture="$3"
-    local coherent="$4"
 
     local version_file_url=null
     if [[ "$runtime" == "dotnet" ]]; then
@@ -433,11 +422,7 @@ get_latest_version_info() {
     elif [[ "$runtime" == "aspnetcore" ]]; then
         version_file_url="$uncached_feed/aspnetcore/Runtime/$channel/latest.version"
     elif [ -z "$runtime" ]; then
-        if [ "$coherent" = true ]; then
-            version_file_url="$uncached_feed/Sdk/$channel/latest.coherent.version"
-        else
          version_file_url="$uncached_feed/Sdk/$channel/latest.version"
-        fi
     else
         say_err "Invalid value for \$runtime"
         return 1
@@ -468,7 +453,6 @@ parse_jsonfile_for_version() {
     sdk_list=$(echo $sdk_section | awk -F"[{}]" '{print $2}')
     sdk_list=${sdk_list//[\" ]/}
     sdk_list=${sdk_list//,/$'\n'}
-    sdk_list="$(echo -e "${sdk_list}" | tr -d '[[:space:]]')"
 
     local version_info=""
     while read -r line; do
@@ -505,26 +489,16 @@ get_specific_version_from_version() {
     local json_file="$5"
 
     if [ -z "$json_file" ]; then
-        case "$version" in
+        if [[ "$version" == "latest" ]]; then 
-            latest)
             local version_info
             version_info="$(get_latest_version_info "$azure_feed" "$channel" "$normalized_architecture" false)" || return 1
             say_verbose "get_specific_version_from_version: version_info=$version_info"
             echo "$version_info" | get_version_from_version_info
             return 0
-                ;;
+        else
-            coherent)
-                local version_info
-                version_info="$(get_latest_version_info "$azure_feed" "$channel" "$normalized_architecture" true)" || return 1
-                say_verbose "get_specific_version_from_version: version_info=$version_info"
-                echo "$version_info" | get_version_from_version_info
-                return 0
-                ;;
-            *)
             echo "$version"
             return 0
-                ;;
+        fi
-        esac
     else
         local version_info
         version_info="$(parse_jsonfile_for_version "$json_file")" || return 1
@@ -538,6 +512,7 @@ get_specific_version_from_version() {
 # channel - $2
 # normalized_architecture - $3
 # specific_version - $4
+# normalized_os - $5
 construct_download_link() {
     eval $invocation
 
@@ -545,17 +520,16 @@ construct_download_link() {
     local channel="$2"
     local normalized_architecture="$3"
     local specific_version="${4//[$'\t\r\n']}"
-
+    local specific_product_version="$(get_specific_product_version "$1" "$4")"
-    local osname
+    local osname="$5"
-    osname="$(get_current_os_name)" || return 1
     
     local download_link=null
     if [[ "$runtime" == "dotnet" ]]; then
-        download_link="$azure_feed/Runtime/$specific_version/dotnet-runtime-$specific_version-$osname-$normalized_architecture.tar.gz"
+        download_link="$azure_feed/Runtime/$specific_version/dotnet-runtime-$specific_product_version-$osname-$normalized_architecture.tar.gz"
     elif [[ "$runtime" == "aspnetcore" ]]; then
-        download_link="$azure_feed/aspnetcore/Runtime/$specific_version/aspnetcore-runtime-$specific_version-$osname-$normalized_architecture.tar.gz"
+        download_link="$azure_feed/aspnetcore/Runtime/$specific_version/aspnetcore-runtime-$specific_product_version-$osname-$normalized_architecture.tar.gz"
     elif [ -z "$runtime" ]; then
-        download_link="$azure_feed/Sdk/$specific_version/dotnet-sdk-$specific_version-$osname-$normalized_architecture.tar.gz"
+        download_link="$azure_feed/Sdk/$specific_version/dotnet-sdk-$specific_product_version-$osname-$normalized_architecture.tar.gz"
     else
         return 1
     fi
@@ -564,6 +538,50 @@ construct_download_link() {
     return 0
 }
 
+# args:
+# azure_feed - $1
+# specific_version - $2
+get_specific_product_version() {
+    # If we find a 'productVersion.txt' at the root of any folder, we'll use its contents 
+    # to resolve the version of what's in the folder, superseding the specified version.
+    eval $invocation
+
+    local azure_feed="$1"
+    local specific_version="${2//[$'\t\r\n']}"
+    local specific_product_version=$specific_version
+
+    local download_link=null
+    if [[ "$runtime" == "dotnet" ]]; then
+        download_link="$azure_feed/Runtime/$specific_version/productVersion.txt${feed_credential}"
+    elif [[ "$runtime" == "aspnetcore" ]]; then
+        download_link="$azure_feed/aspnetcore/Runtime/$specific_version/productVersion.txt${feed_credential}"
+    elif [ -z "$runtime" ]; then
+        download_link="$azure_feed/Sdk/$specific_version/productVersion.txt${feed_credential}"
+    else
+        return 1
+    fi
+
+    if machine_has "curl"
+    then
+        specific_product_version=$(curl -s --fail "$download_link")
+        if [ $? -ne 0 ]
+        then
+            specific_product_version=$specific_version
+        fi
+    elif machine_has "wget"
+    then
+        specific_product_version=$(wget -qO- "$download_link")
+        if [ $? -ne 0 ]
+        then
+            specific_product_version=$specific_version
+        fi
+    fi
+    specific_product_version="${specific_product_version//[$'\t\r\n']}"
+
+    echo "$specific_product_version"
+    return 0
+}
+
 # args:
 # azure_feed - $1
 # channel - $2
@@ -684,11 +702,31 @@ extract_dotnet_package() {
     find "$temp_out_path" -type f | grep -Ev "$folders_with_version_regex" | copy_files_or_dirs_from_list "$temp_out_path" "$out_path" "$override_non_versioned_files"
 
     rm -rf "$temp_out_path"
+    rm -f "$zip_path" && say_verbose "Temporary zip file $zip_path was removed"
 
     if [ "$failed" = true ]; then
         say_err "Extraction failed"
         return 1
     fi
+    return 0
+}
+
+get_http_header_curl() {
+    eval $invocation
+    local remote_path="$1"
+    remote_path_with_credential="${remote_path}${feed_credential}"
+    curl_options="-I -sSL --retry 5 --retry-delay 2 --connect-timeout 15 "
+    curl $curl_options "$remote_path_with_credential" || return 1
+    return 0
+}
+
+get_http_header_wget() {
+    eval $invocation
+    local remote_path="$1"
+    remote_path_with_credential="${remote_path}${feed_credential}"
+    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
 }
 
 # args:
@@ -720,44 +758,56 @@ download() {
     return 0
 }
 
+# Updates global variables $http_code and $download_error_msg
 downloadcurl() {
     eval $invocation
     local remote_path="$1"
     local out_path="${2:-}"
-
     # Append feed_credential as late as possible before calling curl to avoid logging feed_credential
-    remote_path="${remote_path}${feed_credential}"
+    local remote_path_with_credential="${remote_path}${feed_credential}"
-
     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" || failed=true
+        curl $curl_options "$remote_path_with_credential" || failed=true
     else
-        curl $curl_options -o "$out_path" "$remote_path" || failed=true
+        curl $curl_options -o "$out_path" "$remote_path_with_credential" || failed=true
     fi
     if [ "$failed" = true ]; then
-        say_verbose "Curl download failed"
+        local response=$(get_http_header_curl $remote_path_with_credential)
+        http_code=$( echo "$response" | awk '/^HTTP/{print $2}' | tail -1 )
+        download_error_msg="Unable to download $remote_path."
+        if  [[ $http_code != 2* ]]; then
+            download_error_msg+=" Returned HTTP status code: $http_code."
+        fi
+        say_verbose "$download_error_msg"
         return 1
     fi
     return 0
 }
 
+
+# Updates global variables $http_code and $download_error_msg
 downloadwget() {
     eval $invocation
     local remote_path="$1"
     local out_path="${2:-}"
-
     # Append feed_credential as late as possible before calling wget to avoid logging feed_credential
-    remote_path="${remote_path}${feed_credential}"
+    local remote_path_with_credential="${remote_path}${feed_credential}"
     local wget_options="--tries 20 --waitretry 2 --connect-timeout 15 "
     local failed=false
     if [ -z "$out_path" ]; then
-        wget -q $wget_options -O - "$remote_path" || failed=true
+        wget -q $wget_options -O - "$remote_path_with_credential" || failed=true
     else
-        wget $wget_options -O "$out_path" "$remote_path" || failed=true
+        wget $wget_options -O "$out_path" "$remote_path_with_credential" || failed=true
     fi
     if [ "$failed" = true ]; then
-        say_verbose "Wget download failed"
+        local response=$(get_http_header_wget $remote_path_with_credential)
+        http_code=$( echo "$response" | awk '/^  HTTP/{print $2}' | tail -1 )
+        download_error_msg="Unable to download $remote_path."
+        if  [[ $http_code != 2* ]]; then
+            download_error_msg+=" Returned HTTP status code: $http_code."
+        fi
+        say_verbose "$download_error_msg"
         return 1
     fi
     return 0
@@ -770,14 +820,18 @@ calculate_vars() {
     normalized_architecture="$(get_normalized_architecture_from_architecture "$architecture")"
     say_verbose "normalized_architecture=$normalized_architecture"
 
+    normalized_os="$(get_normalized_os "$user_defined_os")"
+    say_verbose "normalized_os=$normalized_os"
+
     specific_version="$(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" "$specific_version")"
+    download_link="$(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" "$specific_version")" || valid_legacy_download_link=false
@@ -822,38 +876,76 @@ install_dotnet() {
     zip_path="$(mktemp "$temporary_file_template")"
     say_verbose "Zip path: $zip_path"
 
-    say "Downloading link: $download_link"
 
     # 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"
+
+    # The download function will set variables $http_code and $download_error_msg in case of failure.
+    http_code=""; download_error_msg=""
     download "$download_link" "$zip_path" 2>&1 || download_failed=true
+    primary_path_http_code="$http_code"; primary_path_download_error_msg="$download_error_msg"
 
     #  if the download fails, download the legacy_download_link
     if [ "$download_failed" = true ]; then
-        say "Cannot download: $download_link"
+        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"
+
+            say "Downloading legacy link $download_link"
+
+            # The download function will set variables $http_code and $download_error_msg in case of failure.
+            http_code=""; download_error_msg=""
             download "$download_link" "$zip_path" 2>&1 || download_failed=true
+            legacy_path_http_code="$http_code";  legacy_path_download_error_msg="$download_error_msg"
 
             if [ "$download_failed" = true ]; then
-                say "Cannot download: $download_link"
+                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 [ "$download_failed" = true ]; then
-        say_err "Could not find/download: \`$asset_name\` with version = $specific_version"
+        if [[ "$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 = $specific_version"
             say_err "Refer to: https://aka.ms/dotnet-os-lifecycle for information on .NET Core support"
+        else
+            say_err "Could not download: \`$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
+        fi
         return 1
     fi
 
     say "Extracting zip from $download_link"
-    extract_dotnet_package "$zip_path" "$install_root"
+    extract_dotnet_package "$zip_path" "$install_root" || return 1
 
     #  Check if the SDK version is installed; if not, fail the installation.
     # if the version contains "RTM" or "servicing"; check if a 'release-type' SDK version is installed.
@@ -869,12 +961,14 @@ install_dotnet() {
     fi
 
     #  Check if the standard SDK version is installed.
-    say_verbose "Checking installation: version = $specific_version"
+    say_verbose "Checking installation: version = $specific_product_version"
-    if is_dotnet_package_installed "$install_root" "$asset_relative_path" "$specific_version"; then
+    if is_dotnet_package_installed "$install_root" "$asset_relative_path" "$specific_product_version"; then
         return 0
     fi
 
-    say_err "\`$asset_name\` with version = $specific_version failed to install with an unknown error."
+    # Version verification failed. More likely something is wrong either with the downloaded content or with the verification algorithm.
+    say_err "Failed to verify the version of installed \`$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."
     return 1
 }
 
@@ -900,6 +994,7 @@ runtime=""
 runtime_id=""
 override_non_versioned_files=true
 non_dynamic_parameters=""
+user_defined_os=""
 
 while [ $# -ne 0 ]
 do
@@ -921,6 +1016,10 @@ do
             shift
             architecture="$1"
             ;;
+        --os|-[Oo][SS])
+            shift
+            user_defined_os="$1"
+            ;;
         --shared-runtime|-[Ss]hared[Rr]untime)
             say_warning "The --shared-runtime flag is obsolete and may be removed in a future version of this script. The recommended usage is to specify '--runtime dotnet'."
             if [ -z "$runtime" ]; then
@@ -972,6 +1071,7 @@ do
             shift
             runtime_id="$1"
             non_dynamic_parameters+=" $name "\""$1"\"""
+            say_warning "Use of --runtime-id is obsolete and should be limited to the versions below 2.1. To override architecture, use --architecture option instead. To override OS, use --os option instead."
             ;;
         --jsonfile|-[Jj][Ss]on[Ff]ile)
             shift
@@ -1004,8 +1104,6 @@ do
             echo "      -Version"
             echo "          Possible values:"
             echo "          - latest - most latest build on specific channel"
-            echo "          - coherent - most latest coherent build on specific channel"
-            echo "              coherent applies only to SDK downloads"
             echo "          - 3-part version in a format A.B.C - represents specific version of build"
             echo "              examples: 2.0.0-preview2-006120; 1.1.0"
             echo "  -i,--install-dir <DIR>             Install under specified location (see Install Location below)"
@@ -1013,6 +1111,11 @@ do
             echo "  --architecture <ARCHITECTURE>      Architecture of dotnet binaries to be installed, Defaults to \`$architecture\`."
             echo "      --arch,-Architecture,-Arch"
             echo "          Possible values: x64, arm, and arm64"
+            echo "  --os <system>                    Specifies operating system to be used when selecting the installer."
+            echo "          Overrides the OS determination approach used by the script. Supported values: osx, linux, linux-musl, freebsd, rhel.6."  
+            echo "          In case any other value is provided, the platform will be determined by the script based on machine configuration."       
+            echo "          Not supported for legacy links. Use --runtime-id to specify platform for legacy links."
+            echo "          Refer to: https://aka.ms/dotnet-os-lifecycle for more information."                 
             echo "  --runtime <RUNTIME>                Installs a shared runtime only, without the SDK."
             echo "      -Runtime"
             echo "          Possible values:"
@@ -1029,14 +1132,15 @@ do
             echo "  --no-cdn,-NoCdn                    Disable downloading from the Azure CDN, and use the uncached feed directly."
             echo "  --jsonfile <JSONFILE>              Determines the SDK version from a user specified global.json file."
             echo "                                     Note: global.json must have a value for 'SDK:Version'"
-            echo "  --runtime-id                       Installs the .NET Tools for the given platform (use linux-x64 for portable linux)."
-            echo "      -RuntimeId"
             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:"
@@ -1058,6 +1162,11 @@ 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."
+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.\n"
+
 check_min_reqs
 calculate_vars
 script_name=$(basename "$0")
@@ -1068,7 +1177,7 @@ if [ "$dry_run" = true ]; then
     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 "\""$normalized_architecture"\"""
+    repeatable_command="./$script_name --version "\""$specific_version"\"" --install-dir "\""$install_root"\"" --architecture "\""$normalized_architecture"\"" --os "\""$normalized_os"\""" 
     if [[ "$runtime" == "dotnet" ]]; then
         repeatable_command+=" --runtime "\""dotnet"\"""
     elif [[ "$runtime" == "aspnetcore" ]]; then
@@ -1079,7 +1188,6 @@ if [ "$dry_run" = true ]; then
     exit 0
 fi
 
-check_pre_reqs
 install_dotnet
 
 bin_path="$(get_absolute_path "$(combine_paths "$install_root" "$bin_folder_relative_path")")"
@@ -1090,4 +1198,6 @@ else
     say "Binaries of dotnet can be found in $bin_path"
 fi
 
+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, select your operating system and check the \"Dependencies\" section."
 say "Installation finished successfully."