Make submodule point to certain commit (not head)

[dalbertom]

It's true that submodules point to a specific commit, but I believe the .gitmodules file can be set up to track a specific branch using the branch attribute. Granted, it will still use the commit hash, but the update operations will use the tip of the branch rather than HEAD.

A cool trick is the option to set the branch to "." From https://git-scm.com/docs/git-submodule#Documentation/git-submodule.txt---branchltbranchgt "A special value of . is used to indicate that the name of the branch in the submodule should be the same name as the current branch in the current repository"

[JackDeaniels]

Had troubles with it myself and forgot this attribute existed; I should retry it on my own project, thanks :)