Add flag to skip download from the CDN, and support installing from a local file share

scripts/obtain/dotnet-install.ps1

@@ -73,6 +73,8 @@
 .PARAMETER SkipNonVersionedFiles
     Default: false
     Skips installing non-versioned files if they already exist, such as dotnet.exe.
+.PARAMETER NoCdn
+    Disable downloading from the Azure CDN, and use the uncached feed directly.
 #>
 [cmdletbinding()]
 param(
@@ -91,13 +93,18 @@ param(
    [string]$FeedCredential,
    [string]$ProxyAddress,
    [switch]$ProxyUseDefaultCredentials,
-   [switch]$SkipNonVersionedFiles
+   [switch]$SkipNonVersionedFiles,
+   [switch]$NoCdn
 )
 
 Set-StrictMode -Version Latest
 $ErrorActionPreference="Stop"
 $ProgressPreference="SilentlyContinue"
 
+if ($NoCdn) {
+    $AzureFeed = $UncachedFeed
+}
+
 $BinFolderRelativePath=""
 
 if ($SharedRuntime -and (-not $Runtime)) {
@@ -461,6 +468,12 @@ function Extract-Dotnet-Package([string]$ZipPath, [string]$OutPath) {
 }
 
 function DownloadFile([Uri]$Uri, [string]$OutPath) {
+    if ($Uri -notlike "http*") {
+        Say-Verbose "Copying file from $Uri to $OutPath"
+        Copy-Item $Uri.AbsolutePath $OutPath
+        return
+    }
+
     $Stream = $null
 
     try {

scripts/obtain/dotnet-install.sh

@@ -648,6 +648,11 @@ download() {
     local remote_path="$1"
     local out_path="${2:-}"
 
+    if [[ "$remote_path" != "http"* ]]; then
+        cp "$remote_path" "$out_path"
+        return $?
+    fi
+
     local failed=false
     if machine_has "curl"; then
         downloadcurl "$remote_path" "$out_path" || failed=true
@@ -811,6 +816,7 @@ install_dir="<auto>"
 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"
 feed_credential=""
@@ -862,6 +868,9 @@ do
         --verbose|-[Vv]erbose)
             verbose=true
             ;;
+        --no-cdn|-[Nn]o[Cc]dn)
+            no_cdn=true
+            ;;
         --azure-feed|-[Aa]zure[Ff]eed)
             shift
             azure_feed="$1"
@@ -924,6 +933,7 @@ do
             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 "  --no-cdn,-NoCdn                    Disable downloading from the Azure CDN, and use the uncached feed directly."
             echo "  --feed-credential,-FeedCredential  Azure feed shared access token. This parameter typically is not specified."
             echo "  --runtime-id                       Installs the .NET Tools for the given platform (use linux-x64 for portable linux)."
             echo "      -RuntimeId"
@@ -949,6 +959,10 @@ do
     shift
 done
 
+if [ "$no_cdn" = true ]; then
+    azure_feed="$uncached_feed"
+fi
+
 check_min_reqs
 calculate_vars