Per-Platform TLS Defaults in PowerShell Scripts (#353)

scripts/build.ps1

@@ -58,7 +58,7 @@ param (
 
     [Parameter(Mandatory = $false)]
     [ValidateSet("schannel", "openssl", "stub", "mitls")]
-    [string]$Tls = "schannel",
+    [string]$Tls = $null,
 
     [Parameter(Mandatory = $false)]
     [switch]$DisableLogs = $false,
@@ -85,6 +85,15 @@ param (
 Set-StrictMode -Version 'Latest'
 $PSDefaultParameterValues['*:ErrorAction'] = 'Stop'
 
+# Default TLS based on current platform.
+if ($null -eq $Tls) {
+    if ($IsWindows) {
+        $Tls = "schannel"
+    } else {
+        $Tls = "openssl"
+    }
+}
+
 # Root directory of the project.
 $RootDir = Split-Path $PSScriptRoot -Parent
 

scripts/interop.ps1

@@ -40,7 +40,7 @@ param (
 
     [Parameter(Mandatory = $false)]
     [ValidateSet("schannel", "openssl", "stub", "mitls")]
-    [string]$Tls = "schannel",
+    [string]$Tls = $null,
 
     [Parameter(Mandatory = $false)]
     [switch]$KeepOutputOnSuccess = $false,
@@ -62,6 +62,15 @@ param (
 Set-StrictMode -Version 'Latest'
 $PSDefaultParameterValues['*:ErrorAction'] = 'Stop'
 
+# Default TLS based on current platform.
+if ($null -eq $Tls) {
+    if ($IsWindows) {
+        $Tls = "schannel"
+    } else {
+        $Tls = "openssl"
+    }
+}
+
 # Root directory of the project.
 $RootDir = Split-Path $PSScriptRoot -Parent
 

scripts/spin.ps1

@@ -43,7 +43,7 @@ param (
 
     [Parameter(Mandatory = $false)]
     [ValidateSet("schannel", "openssl", "stub", "mitls")]
-    [string]$Tls = "schannel",
+    [string]$Tls = $null,
 
     [Parameter(Mandatory = $false)]
     [Int32]$Timeout = 60000,
@@ -68,6 +68,15 @@ param (
 Set-StrictMode -Version 'Latest'
 $PSDefaultParameterValues['*:ErrorAction'] = 'Stop'
 
+# Default TLS based on current platform.
+if ($null -eq $Tls) {
+    if ($IsWindows) {
+        $Tls = "schannel"
+    } else {
+        $Tls = "openssl"
+    }
+}
+
 # Root directory of the project.
 $RootDir = Split-Path $PSScriptRoot -Parent
 

scripts/test.ps1

@@ -83,7 +83,7 @@ param (
 
     [Parameter(Mandatory = $false)]
     [ValidateSet("schannel", "openssl", "stub", "mitls")]
-    [string]$Tls = "schannel",
+    [string]$Tls = $null,
 
     [Parameter(Mandatory = $false)]
     [string]$Filter = "",
@@ -131,6 +131,15 @@ param (
 Set-StrictMode -Version 'Latest'
 $PSDefaultParameterValues['*:ErrorAction'] = 'Stop'
 
+# Default TLS based on current platform.
+if ($null -eq $Tls) {
+    if ($IsWindows) {
+        $Tls = "schannel"
+    } else {
+        $Tls = "openssl"
+    }
+}
+
 # Root directory of the project.
 $RootDir = Split-Path $PSScriptRoot -Parent