Show repo ETag and parsing errors in Failed Downloads

Core/Net/Net.cs

@@ -51,10 +51,19 @@ public static string CurrentETag(Uri url)
             WebRequest req = WebRequest.Create(url);
             #pragma warning restore SYSLIB0014
             req.Method = "HEAD";
-            HttpWebResponse resp = (HttpWebResponse)req.GetResponse();
-            string val = resp.Headers["ETag"]?.Replace("\"", "");
-            resp.Close();
-            return val;
+            try
+            {
+                HttpWebResponse resp = (HttpWebResponse)req.GetResponse();
+                string val = resp.Headers["ETag"]?.Replace("\"", "");
+                resp.Close();
+                return val;
+            }
+            catch (WebException exc)
+            {
+                // Let the calling code keep going to get the actual problem
+                log.Debug($"Failed to get ETag from {url}", exc);
+                return null;
+            }
         }
 
         /// <summary>

Core/Properties/Resources.resx

@@ -151,6 +151,7 @@ Install the `mono-complete` package or equivalent for your operating system.</va
   <data name="NetRepoInconsistenciesHeader" xml:space="preserve"><value>The following inconsistencies were found:</value></data>
   <data name="NetRepoLoadingModulesFromRepo" xml:space="preserve"><value>Loading modules from downloaded {0} repository...</value><comment>Should contain UserProgressDownloadSubstring from CmdLine</comment></data>
   <data name="NetRepoLoadedDownloadCounts" xml:space="preserve"><value>Loaded download counts from {0} repository</value></data>
+  <data name="NetRepoNotATarGz" xml:space="preserve"><value>Not a .tar.gz or .zip, cannot process: {0}</value></data>
   <data name="JsonRelationshipConverterAnyOfCombined" xml:space="preserve"><value>`any_of` should not be combined with `{0}`</value></data>
   <data name="RegistryFileConflict" xml:space="preserve"><value>{0} wishes to install {1}, but this file is registered to {2}</value></data>
   <data name="RegistryFileNotRemoved" xml:space="preserve"><value>Error unregistering {1}, file not removed: {0}</value></data>

Core/Repositories/RepositoryData.cs

@@ -187,7 +187,7 @@ public static RepositoryData FromDownload(string path, IGame game, IProgress<lon
             {
                 case FileType.TarGz: return FromTarGz(path, game, progress);
                 case FileType.Zip:   return FromZip(path, game, progress);
-                default: throw new UnsupportedKraken($"Not a .tar.gz or .zip, cannot process: {path}");
+                default: throw new UnsupportedKraken(string.Format(Properties.Resources.NetRepoNotATarGz, path));
             }
         }
 

Core/Repositories/RepositoryDataManager.cs

@@ -169,21 +169,29 @@ public UpdateResult Update(Repository[]       repos,
                 var progress = new ProgressFilesOffsetsToPercent(
                     new Progress<int>(p => user.RaiseProgress(msg, p)),
                     targets.Select(t => new FileInfo(t.filename).Length));
-                foreach ((Repository repo, NetAsyncDownloader.DownloadTarget target) in toUpdate.Zip(targets))
+                foreach ((var repo, var target) in toUpdate.Zip(targets))
                 {
                     var file = target.filename;
                     msg = string.Format(Properties.Resources.NetRepoLoadingModulesFromRepo,
                                         repo.name);
-                    // Load the file, save to in memory cache
                     log.InfoFormat("Loading {0}...", file);
-                    var repoData = repositoriesData[repo] =
-                        RepositoryData.FromDownload(file, game, progress);
-                    // Save parsed data to disk
-                    log.DebugFormat("Saving data for {0} repo...", repo.name);
-                    repoData.SaveTo(GetRepoDataPath(repo));
-                    // Delete downloaded archive
-                    log.DebugFormat("Deleting {0}...", file);
-                    File.Delete(file);
+                    try
+                    {
+                        // Load the file, save to in memory cache
+                        var repoData = repositoriesData[repo] =
+                            RepositoryData.FromDownload(file, game, progress);
+                        // Save parsed data to disk
+                        log.DebugFormat("Saving data for {0} repo...", repo.name);
+                        repoData.SaveTo(GetRepoDataPath(repo));
+                        // Delete downloaded archive
+                        log.DebugFormat("Deleting {0}...", file);
+                        File.Delete(file);
+                    }
+                    catch (UnsupportedKraken kraken)
+                    {
+                        // Show parsing errors in the Downloads Failed popup
+                        throw new DownloadErrorsKraken(Array.IndexOf(toUpdate, repo), kraken);
+                    }
                     progress.NextFile();
                 }
                 // Commit these etags to disk

Core/Types/Kraken.cs

@@ -303,6 +303,14 @@ public DownloadErrorsKraken(List<KeyValuePair<int, Exception>> errors)
         {
             Exceptions = new List<KeyValuePair<int, Exception>>(errors);
         }
+
+        public DownloadErrorsKraken(int index, Exception exc)
+        {
+            Exceptions = new List<KeyValuePair<int, Exception>>
+            {
+                new KeyValuePair<int, Exception>(index, exc),
+            };
+        }
     }
 
     /// <summary>