Mutagen: ignore paths specified by gitattributes export-ignore

[brandonkelly]

It would be really cool if DDEV could automatically configure Mutagen to ignore paths specified to be excluded by .gitattributes files within the project, via export-ignore directives.

I’m imagining this would be opt-in, via a new sync.defaults.ignore.gitattributes setting:

sync:
  defaults:
    mode: "two-way-resolved"
    stageMode: "neighboring"
    ignore:
      gitattributes: true
      paths:
        - ...

With that enabled, if a project has a lib/x/.gitattributes file with the following:

/src/web/assets/**/src export-ignore

DDEV could then see that file, parse it for export-ignore lines, and add the following to Mutagen’s sync.defaults.ignore.paths array:

• lib/x/src/web/assets/**/src

[rfay]

I'm not sure it's a reasonable assumption that mutagen syncing should be determined by git settings. You could easily make a script that did this for your situation though, and updated the mutagen.yml.