CoreFX does not support the archive bit on non-Windows platforms, leading to switchfs being broken entirely

[leo60228]

https://github.com/dotnet/corefx/blob/da3ba7ebe34771dde769b65dfb7f78fa55a5abb6/src/System.IO.FileSystem/src/System/IO/FileStatus.Unix.cs#L67-L157

[leo60228]

switchfs gives a warning that the archive bit is not set, sets it (which silently fails), and then itself silently fails due to the archive bit not actually getting set.

[leo60228]

It may be useful to ignore the archive bit on non-Windows, and use heuristics instead.

[leo60228]

You could also manually support the archive bit by using FFI. http://man7.org/linux/man-pages/man2/ioctl_fat.2.html

[Thealexbarney]

Opened an issue at dotnet/corefx#39274, and a PR for a partial workaround at #71