private bool SetSmvVersion()

in SmvCloudWorker/WorkerRole.cs [236:291]
43 lines of code
7 McCabe index (conditional complexity)

        private bool SetSmvVersion(string version)
        {
            // The version string cannot be empty.
            if (String.IsNullOrEmpty(version))
            {
                return false;
            }

            // First, check if the SMV version already exists in our local machine.
            string smvName = "smv-" + version;
            string smvFilename = smvName + ".zip";
            CloudBlockBlob blob = versionsContainer.GetBlockBlobReference(smvFilename);

            blob.FetchAttributes();
            if (smvVersions.ContainsKey(version) && smvVersions[version].Item2 >= blob.Properties.LastModified.Value.UtcDateTime)
            {
                smvVersionsDirectory = smvVersions[version].Item1;
                Environment.SetEnvironmentVariable("smv", smvVersionsDirectory);
                return true;
            }

            // Download the SMV version if it's not available locally.
            string zipPath = Path.Combine(smvVersionsDirectory, smvFilename);
            if (File.Exists(zipPath))
            {
                File.Delete(zipPath);
            }
            blob.DownloadToFile(zipPath, FileMode.CreateNew);

            // Delete the version's directory to clear it of any old files.
            string dir = Path.Combine(smvVersionsDirectory, smvName);
            if (Directory.Exists(dir))
            {
                Directory.Delete(dir, true);
            }

            // Now we'll unpack our version of SMV.
            try
            {
                Directory.CreateDirectory(dir);
                ZipFile.ExtractToDirectory(zipPath, dir);
                File.Delete(zipPath);
            }
            catch (Exception e)
            {
                Trace.TraceError("Error unzipping smv.zip: Exception: {0}", e.ToString());
                return false;
            }

            // We've setup a version of SMV successfully. Set smvPath and add this version to the list of avaiable SMV versions.
            smvDirectory = dir;
            Environment.SetEnvironmentVariable("smv", smvDirectory);
            smvVersions[version] = new Tuple<string, DateTime>(smvDirectory, blob.Properties.LastModified.Value.UtcDateTime);

            return true;
        }