Method ProcessStart

src/Update/Program.cs:457–505

(string exeName, string arguments, bool shouldWait)

        }

        public void ProcessStart(string exeName, string arguments, bool shouldWait)
        {
            if (String.IsNullOrWhiteSpace(exeName)) {
                ShowHelp();
                return;
            }

            // Find the latest installed version's app dir
            var appDir = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);
            var releases = ReleaseEntry.ParseReleaseFile(
                File.ReadAllText(Utility.LocalReleaseFileForAppDir(appDir), Encoding.UTF8));

            // NB: We add the hacked up version in here to handle a migration
            // issue, where versions of Squirrel pre PR #450 will not understand
            // prerelease tags, so it will end up writing the release name sans
            // tags. However, the RELEASES file _will_ have them, so we need to look
            // for directories that match both the real version, and the sanitized
            // version, giving priority to the former.
            var latestAppDir = releases
                .OrderByDescending(x => x.Version)
                .SelectMany(x => new[] {
                    Utility.AppDirForRelease(appDir, x),
                    Utility.AppDirForVersion(appDir, new SemanticVersion(x.Version.Version.Major, x.Version.Version.Minor, x.Version.Version.Build, ""))
                })
                .FirstOrDefault(x => Directory.Exists(x));

            // Check for the EXE name they want
            var targetExe = new FileInfo(Path.Combine(latestAppDir, exeName.Replace("%20", " ")));
            this.Log().Info("Want to launch '{0}'", targetExe);

            // Check for path canonicalization attacks
            if (!targetExe.FullName.StartsWith(latestAppDir, StringComparison.Ordinal)) {
                throw new ArgumentException();
            }

            if (!targetExe.Exists) {
                this.Log().Error("File {0} doesn't exist in current release", targetExe);
                throw new ArgumentException();
            }

            if (shouldWait) waitForParentToExit();

            try {
                this.Log().Info("About to launch: '{0}': {1}", targetExe.FullName, arguments ?? "");
                Process.Start(new ProcessStartInfo(targetExe.FullName, arguments ?? "") { WorkingDirectory = Path.GetDirectoryName(targetExe.FullName) });
            } catch (Exception ex) {
                this.Log().ErrorException("Failed to start process", ex);
            }
        }

        public void ShowHelp()
        {