Stefan Klein於 2017年6月15日星期四 UTC+8上午12時28分16秒寫道:
> Hi,
> i do have multiple projects which share the same submodules.
> Each project might point to a different commit of a given submodule, but 
> the submodules are exactly the same.
> No problem with this so far.
> It just bothers me that each submodule occupies disk space, that i have to 
> fetch each submodule multiple times although the local repository for each 
> submodule should be exactly the same.
> Is there an easy way, which doesn't interfere with my colleges, to have 
> the submodule of each project use the same local repository? (and still 
> have their own individual working directory)
> Closest I found so far in documentation are worktrees but i found no clue 
> on how they might work with modules.
> regards,
> Stefan

rough steps:

0. suppose there are A and B branch in TheSubmodule repo, A is used by 
ProjectA, and B is used by ProjectB
1. move Projects/ProjectA/.git/modules/TheSubmodule to a common folder, say 
2. delete the key worktree of Projects/Common/TheSubmodule/config file
3. modify Projects/ProjectA/TheSubmodule/.git file, make the gitdir points 
to the new path inner that common folder.
4. rename Projects/ProjectB/TheSubmodule to 
5. run command `git worktree add ../../ProjectB/TheSubmodule B` in 
6. delete Projects/ProjectB/TheOldSubmodule and 

Yue Lin Ho

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