Merge pull request #18469 from github/mbg/csharp/fix-crash-if-proxy-env-vars-are-already-set

C#: Fix crash if proxy environment variables are already set

Author: mbg

csharp/extractor/Semmle.Extraction.CSharp.DependencyFetching/DependabotProxy.cs

@@ -52,8 +52,6 @@ public class DependabotProxy : IDisposable
 
             if (!string.IsNullOrWhiteSpace(cert))
             {
-                logger.LogInfo("No certificate configured for Dependabot proxy.");
-
                 var certDirPath = new DirectoryInfo(Path.Join(tempWorkingDirectory.DirInfo.FullName, ".dependabot-proxy"));
                 Directory.CreateDirectory(certDirPath.FullName);
 

csharp/extractor/Semmle.Extraction.CSharp.DependencyFetching/DotNetCliInvoker.cs

@@ -46,9 +46,9 @@ private ProcessStartInfo MakeDotnetStartInfo(string args, string? workingDirecto
             {
                 logger.LogInfo($"Setting up Dependabot proxy at {this.proxy.Address}");
 
-                startInfo.EnvironmentVariables.Add("HTTP_PROXY", this.proxy.Address);
-                startInfo.EnvironmentVariables.Add("HTTPS_PROXY", this.proxy.Address);
-                startInfo.EnvironmentVariables.Add("SSL_CERT_FILE", this.proxy.CertificatePath);
+                startInfo.EnvironmentVariables["HTTP_PROXY"] = this.proxy.Address;
+                startInfo.EnvironmentVariables["HTTPS_PROXY"] = this.proxy.Address;
+                startInfo.EnvironmentVariables["SSL_CERT_FILE"] = this.proxy.CertificatePath;
             }
 
             return startInfo;