Isolate write operation

Author: Simon Ejsing

src/GitVersionCore/ExecuteCore.cs

@@ -62,9 +62,9 @@ public VersionVariables ExecuteGitVersion(string targetUrl, string dynamicReposi
                     {
                         gitVersionCache.WriteVariablesToDiskCache(repo, dotGitDirectory, versionVariables);
                     }
-                    catch (IOException)
+                    catch (IOException e)
                     {
-                        Logger.WriteInfo("I/O exception during cache write");
+                        Logger.WriteWarning(string.Format("I/O exception during cache write:{0}{1}", Environment.NewLine, e));
                     }
                 }
 

src/GitVersionCore/GitVersionCache.cs

@@ -24,16 +24,16 @@ public void WriteVariablesToDiskCache(IRepository repo, string gitDir, VersionVa
             var cacheFileName = GetCacheFileName(GetKey(repo, gitDir), GetCacheDir(gitDir));
             variablesFromCache.FileName = cacheFileName;
 
+            Dictionary<string, string> dictionary;
+            using (Logger.IndentLog("Creating dictionary"))
+            {
+                dictionary = variablesFromCache.ToDictionary(x => x.Key, x => x.Value);
+            }
+
             using (var stream = fileSystem.OpenWrite(cacheFileName))
             {
                 using (var sw = new StreamWriter(stream))
                 {
-                    Dictionary<string, string> dictionary;
-                    using (Logger.IndentLog("Creating dictionary"))
-                    {
-                        dictionary = variablesFromCache.ToDictionary(x => x.Key, x => x.Value);
-                    }
-
                     using (Logger.IndentLog("Storing version variables to cache file " + cacheFileName))
                     {
                         var serializer = new Serializer();