Repeated repo.is_dirty Call Slows Initialization

Hey,

I am using sacred in a project. Initializing runs has become very slow: it currently takes 1-2 minutes. During initialization, every relevant source file is added via Ingredient.add_source_file. I profiled my initialization procedure and noticed that about 70% of the time is spent on ca. 150 repo.is_dirty() calls in

sacred/sacred/dependencies.py

Line 400 in c9266e0

def get_commit_if_possible(filename, save_git_info):

I was wondering whether anybody else was facing a similar issue. Maybe it would be a good idea to cache the result of repo.is_dirty() (though calling repo = Repo(directory, search_parent_directories=True) may still be necessary in order to handle nested repositories (?)). This is not a pressing issue, but if anybody else is experiencing something like this, it might be worth looking into. Thanks for your support!

Best,
Markus

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