From 20a0ba041ca7e588657538ccfd6351ea81b8c150 Mon Sep 17 00:00:00 2001
From: Dongbo Wang <dongb.wang@gmail.com>
Date: Mon, 21 Nov 2016 16:02:52 -0800
Subject: [PATCH] Fix the indicator for redirecting standard input (#2749)

---
 .../engine/NativeCommandProcessor.cs                 |  2 +-
 src/System.Management.Automation/engine/pipeline.cs  |  2 +-
 .../NativeExecution/NativeLinuxCommands.Tests.ps1    | 12 ++++++++++++
 3 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/src/System.Management.Automation/engine/NativeCommandProcessor.cs b/src/System.Management.Automation/engine/NativeCommandProcessor.cs
index 937134ad56..f572e5a686 100644
--- a/src/System.Management.Automation/engine/NativeCommandProcessor.cs
+++ b/src/System.Management.Automation/engine/NativeCommandProcessor.cs
@@ -1186,7 +1186,7 @@ namespace System.Management.Automation
         /// <param name="redirectInput"></param>
         private void CalculateIORedirection(out bool redirectOutput, out bool redirectError, out bool redirectInput)
         {
-            redirectInput = this.Command.MyInvocation.PipelinePosition > 0;
+            redirectInput = this.Command.MyInvocation.ExpectingInput;
             redirectOutput = true;
             redirectError = true;
 
diff --git a/src/System.Management.Automation/engine/pipeline.cs b/src/System.Management.Automation/engine/pipeline.cs
index a6bda4a0e8..dba620bbba 100644
--- a/src/System.Management.Automation/engine/pipeline.cs
+++ b/src/System.Management.Automation/engine/pipeline.cs
@@ -1026,8 +1026,8 @@ namespace System.Management.Automation.Internal
                 myInfo.PipelinePosition = i + 1;
                 myInfo.PipelineLength = _commands.Count;
                 myInfo.PipelineIterationInfo = pipelineIterationInfo;
-                commandProcessor.DoPrepare(psDefaultParameterValues);
                 myInfo.ExpectingInput = commandProcessor.IsPipelineInputExpected();
+                commandProcessor.DoPrepare(psDefaultParameterValues);
             }
 
             // Clear ErrorVariable as appropriate
diff --git a/test/powershell/Language/Scripting/NativeExecution/NativeLinuxCommands.Tests.ps1 b/test/powershell/Language/Scripting/NativeExecution/NativeLinuxCommands.Tests.ps1
index a8a38ab6d5..d7203ec277 100644
--- a/test/powershell/Language/Scripting/NativeExecution/NativeLinuxCommands.Tests.ps1
+++ b/test/powershell/Language/Scripting/NativeExecution/NativeLinuxCommands.Tests.ps1
@@ -15,6 +15,18 @@ Describe "NativeLinuxCommands" -tags "CI" {
     It "Should find Application touch" -Skip:$IsWindows {
         (get-command touch).CommandType | Should Be Application
     }
+
+    It "Should not redirect standard input if native command is the first command in pipeline (1)" -Skip:$IsWindows {
+        stty | ForEach-Object -Begin { $out = @() } -Process { $out += $_ }
+        $out.Length -gt 0 | Should Be $true
+        $out[0] -like "speed * baud; line =*" | Should Be $true
+    }
+
+    It "Should not redirect standard input if native command is the first command in pipeline (2)" -Skip:$IsWindows {
+        $out = stty
+        $out.Length -gt 0 | Should Be $true
+        $out[0] -like "speed * baud; line =*" | Should Be $true
+    }
 }
 
 Describe "Scripts with extensions" -tags "CI" {