GitAttributes feature export-ignore works, but -export-ignore (with dash) should also work

From: M Lewis <picevio@gmail.com>
Date: Nov 20, 2019, 16:44 UTC
Message-ID: <01e0a4ab-d809-d968-5671-b731438c2bc4@gmail.com>

When running 'git archive', the .gitattributes file is used to determine paths that should be ignored when building the archive by using 'export-ignore'. But it would be useful to include certain sub-paths in the ignored path.

For example, say I have folders like these
     /all_useful                  # this entire sub directory is needed 
in the archive
     /mostly_unuseful             # there are many sub directories in 
here to ignore
/mostly_unuseful/needed_a    # but these specific sub directories are 
desired in the archive
/mostly_unuseful/needed_b

The git-attribute document says a dash '-' prefix should unset the attribute. It should work with 'export-ignore'

So if I want for example '/mostly_unuseful/needed_a' in my archive, I should be able to specify that in my .gitattributes file like this:

     /mostly_unuseful                  export-ignore # do not archive
/mostly_unuseful/needed_a -export-ignore # do add to archive
/mostly_unuseful/needed_b    -export-ignore # do add to archive

Thank you