Make sure CTime adds nanoseconds on Unix when retrieving info from disk.

dotnet · Jun 22, 2022 · cad5599 · cad5599
1 parent c7a0923
commit cad5599
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/src/libraries/System.Formats.Tar/src/System/Formats/Tar/TarWriter.Unix.cs b/src/libraries/System.Formats.Tar/src/System/Formats/Tar/TarWriter.Unix.cs
@@ -60,7 +60,8 @@ partial void ReadFileFromDiskAndWriteToArchiveStreamAsEntry(string fullPath, str
 
             entry._header._mTime = info.LastWriteTimeUtc;
             entry._header._aTime = info.LastAccessTimeUtc;
-            entry._header._cTime = TarHelpers.GetDateTimeOffsetFromSecondsSinceEpoch(status.CTime);
+            // FileSystemInfo does not have ChangeTime, but LastWriteTime and LastAccessTime make sure to add nanoseconds, so we should do the same here
+            entry._header._cTime = DateTimeOffset.FromUnixTimeSeconds(status.CTime).AddTicks(status.CTimeNsec / 100 /* nanoseconds per tick */);
 
             entry._header._mode = (status.Mode & 4095); // First 12 bits