SVN Pre Commit Hook Not Exiting

Question

I am writing a pre-commit hook for an SVN Repository (don't ask!!!)

I want to validate the commit message against a regular expression to ensure that it is formatted correctly.

So, I have written the following code:

    static void Main(string[] args)
    {
        var repos = args[0];
        var txn = args[1];
        string branch = GetSvnLookOutput(repos, txn, "dirs-changed").ToString().Trim();
        bool isWorkingCode = IsWorkingCode(branch);
        bool isMergedCode = IsMergedCode(branch);
        bool isTaggedCode = IsTaggedCode(branch);
        var log = GetSvnLookOutput(repos, txn, "log");
        string author = GetSvnLookOutput(repos, txn, "author").ToString().Trim();
        var logValidation = GetCommitMessageErrors(log, isWorkingCode, isMergedCode, isTaggedCode);
        if (logValidation != null)
        {
            Console.Error.WriteLine(logValidation);
            Environment.Exit(1);
        }
        Environment.Exit(0);
    }

Where GetCommitMessageErrors checks the message against a regular expression and returns an error message if it does not match, null if it does:

private static string GetCommitMessageErrors(string log, bool isWorkingCode, bool isMergedCode, bool isTaggedCode)
        {
            if (isWorkingCode)
            { 
                    if (!Regex.IsMatch(log, workingCodeCommitMessageRegex, RegexOptions.Multiline))
                    {
                        StreamReader streamReader = new StreamReader(ConfigurationManager.AppSettings["Coding Commit Message Sample"]);
                        string commitMessageSample = streamReader.ReadToEnd();
                        return "Commit message needs to be in the following format:"
                        + Environment.NewLine
                        + Environment.NewLine
                        + commitMessageSample;
                    }
            }
            return null;
        }

and GetSvnLookOutput examines the properties of the transaction to be committed using svnlook.exe:

 private static string GetSvnLookOutput(string repos, string txn, string subcommand)
        {
            var processStartInfo = new ProcessStartInfo
            {
                FileName = "svnlook.exe",
                UseShellExecute = false,
                CreateNoWindow = true,
                RedirectStandardOutput = true,
                RedirectStandardError = true,
                Arguments = String.Format("{0} -t \"{1}\" \"{2}\"", subcommand, txn, repos)
            };

            var process = Process.Start(processStartInfo);
            var output = process.StandardOutput.ReadToEnd();
            process.WaitForExit();
            return output;
        }

When I attach this as a pre-commit hook in the repository using something like

C:\Repositories\SvnPreCommitHooks.exe %1 %2 

I get an error message returned if I enter a log message that does not conform to the regular expression (that part I'm happy enough with!).

However, if I enter a valid commit message (i.e. one that does conform to the regular expression) then I do not get an error message but then the application hangs (I can see it in the task manager).

Un-commenting the lines:

if (logValidation != null)
        {
            Console.Error.WriteLine(logValidation);
            Environment.Exit(1);
        }

Will ensure that the hook executes without errors but then that's where I want to trap any deviations from the standard message format.

Does anyone know or care to suggest what might be causing the application to hang in this instance? I am having trouble debugging it where it is installed (i.e. on a production environment) as I am unable to attach a debugger so I can see where it has gotten to in its execution.

Thanks,

Sean