notebook/IT/Git/Submodule.md
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# submodule
Git submodule allows ro add externel repository in a repository
## Adding submodule
- ```git submodule add http://git/toto.git $path```
this command add *<http://git/toto.git>* in *path* directory (add -b $branchname to follow specific branch)
- after that you need to add and commit submodule folder
to populate a submodule nested in other submodule
- ```git submodule init```
- ```git submodule update```
## removing submodule
- remove submodule entry in *.gitmodules*
- remove submodule entry in *.git/config* (only present when **git submodule init** have been perform)
- remove submodule path ```git rm --cached $path```
## Updating submodule
you can update a submodule Manually going in submodule folder and perform a ```git fetch``` and ```git merge```
### Fetch and merge
automatic process
- perform a ```git submodule update --remote```
in each case you need to commit update in project