do nothing if not on Windows

1 files changed, 27 insertions, 24 deletions

diff --git a/action.yml b/action.yml
index a418c44..ab49669 100644
--- a/action.yml
+++ b/action.yml
@@ -85,34 +85,37 @@ runs:
             }
         }
 
-        $old_values = @{}
-        Get-ChildItem env: | %{ $old_values.Add($_.Name, $_.Value) }
-
-        $info = Locate-VS
-        try {
-            Import-PS $info
-        } catch {
-            echo $_
-            Import-CMD $info
-        }
-
-        $new_values = @{}
-        Get-ChildItem env: | %{ $new_values.Add($_.Name, $_.Value) }
+        if ('${{ runner.os }}' -ne 'Windows') {
+            echo 'Not going to set up a Visual Studio shell on ${{ runner.os }}'
+        } else {
+            $old_values = @{}
+            Get-ChildItem env: | %{ $old_values.Add($_.Name, $_.Value) }
+
+            $info = Locate-VS
+            try {
+                Import-PS $info
+            } catch {
+                echo $_
+                Import-CMD $info
+            }
 
-        # Some diagnostics as to which exact variables were modified follows:
-        echo '----------------------------------------------------------------'
-        echo 'New variables'
-        echo '----------------------------------------------------------------'
-        $new_values.GetEnumerator() | where { -not $old_values.ContainsKey($_.Name) } | Format-List
+            $new_values = @{}
+            Get-ChildItem env: | %{ $new_values.Add($_.Name, $_.Value) }
 
-        echo '----------------------------------------------------------------'
-        echo 'Modified variables'
-        echo '----------------------------------------------------------------'
-        $new_values.GetEnumerator() | where { $old_values.ContainsKey($_.Name) -and $old_values[$_.Name] -ne $_.Value } | Format-List
+            # Some diagnostics as to which exact variables were modified follows:
+            echo '----------------------------------------------------------------'
+            echo 'New variables'
+            echo '----------------------------------------------------------------'
+            $new_values.GetEnumerator() | where { -not $old_values.ContainsKey($_.Name) } | Format-List
 
+            echo '----------------------------------------------------------------'
+            echo 'Modified variables'
+            echo '----------------------------------------------------------------'
+            $new_values.GetEnumerator() | where { $old_values.ContainsKey($_.Name) -and $old_values[$_.Name] -ne $_.Value } | Format-List
 
-        # Update the current environment:
-        Get-ChildItem env: | %{ echo "$($_.Name)=$($_.Value)" >> $env:GITHUB_ENV }
+            # Update the current environment:
+            Get-ChildItem env: | %{ echo "$($_.Name)=$($_.Value)" >> $env:GITHUB_ENV }
+        }
       shell: pwsh
 branding:
   icon: star