Running a current mypy on mkosi gives the following warnings

mkosi:968: error: Argument 1 to "partition" has incompatible type "Optional[str]"; expected "str"
mkosi:971: error: Argument 1 to "partition" has incompatible type "Optional[str]"; expected "str"
mkosi:4624: error: "Dict[str, CommandLineArguments]" has no attribute "director

The last line is harmless and addressed in #36

Description

The following file is a partclone image (copied from a Clonezilla backup).

https://github.com/discimagechef/DiscImageChef/files/3955569/sda1.ntfs-ptcl-img.gz.aa.zip
(Apologies - I've had to zip it up)

DiscImageChef correctly identifies it as GZip, but when it tries to identify the file system it does not match against partclone.

Exact command line used:

str