GitHub Actions Runner

src/Runner.Sdk/Util/PathUtil.cs

@@ -0,0 +1,36 @@
+using System;
+using System.IO;
+
+namespace GitHub.Runner.Sdk
+{
+    public static class PathUtil
+    {
+#if OS_WINDOWS
+        public static readonly string PathVariable = "Path";
+#else
+        public static readonly string PathVariable = "PATH";
+#endif
+
+        public static string PrependPath(string path, string currentPath)
+        {
+            ArgUtil.NotNullOrEmpty(path, nameof(path));
+            if (string.IsNullOrEmpty(currentPath))
+            {
+                // Careful not to add a trailing separator if the PATH is empty.
+                // On OSX/Linux, a trailing separator indicates that "current directory"
+                // is added to the PATH, which is considered a security risk.
+                return path;
+            }
+
+            // Not prepend path if it is already the first path in %PATH%
+            if (currentPath.StartsWith(path + Path.PathSeparator, IOUtil.FilePathStringComparison))
+            {
+                return currentPath;
+            }
+            else
+            {
+                return path + Path.PathSeparator + currentPath;
+            }
+        }
+    }
+}