I work on a team on a large repo. Recently we decided to move one of the folders into its own submodule
-- aaa
     -- .git
     --  bbb
     --  ccc
     --  www      # this folder is going into its own repo.
I followed the instructions to filter out the www folder into its own repo listed here: Detach (move) subdirectory into separate Git repository.  I moved the www folder out of the aaa repo.
I removed the directory from the master branch by running these commands:
 $ cd aaa
 $ git checkout master
 $ git rm -rf www
 $ git commit -m "remove the www/ folder from the aaa repo."
So now on master, the tree looks like this:
 -- aaa
     -- .git
     --  bbb
     --  ccc
I'd like to add www as a submodule by running:
$ cd aaa
$ git checkout master
$ git submodule add git@bitbucket.org:kevinburke/www.git www
Cloning into 'www'...
remote: Counting objects: 717, done.
remote: Compressing objects: 100% (392/392), done.
remote: Total 717 (delta 318), reused 711 (delta 317)
Receiving objects: 100% (717/717), 440.52 KiB | 58 KiB/s, done.
Resolving deltas: 100% (318/318), done.
That works fine on master. However, any time I try to switch to another branch, I get the following error:
$ cd aaa
$ git checkout other-old-branch
error: The following untracked working tree files would be overwritten by checkout:
    www/1...
    www/2...
    www/3...
    www/4...
Aborting
How can I remove the www folder from all the branches in the aaa repo? There are about 100 branches, so doing this manually would be a hassle.
I'm not worried about keeping any outstanding changes that exist in www folders of older branches.
 
     
     
    