Git ignore locally deleted folder

Question

I have a Ruby on Rails application which crashes when vendor/rails is present but works fine if it is not. I need to keep this folder deleted in my local copy so th

Answer 1

 git ls-files --deleted -z | git update-index --assume-unchanged -z --stdin

Note that because this is an index-based operation, you cannot set directories to be ignored – only individual files. If upstream ever adds a file inside those directories, you will have to repeat the fix-up.