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gitgit-submodules

Git - submodule, keep track of what submodule commit to use

Where does the "super"-repo keep track of what commit each submodule is at?

I dont see any of that info in .gitmodules

What I want to achieve is if I tag the "super"-repo, with say 1.0-alpha, then it will remember at what commit all the submodules was at that time, so when I checkout that tag later, I'll get the submodules at their correct commit position aswell.

Is this possible without manually writing down the commit-position for each submodule?

I now realize I can get that info later on by using:

git ls-tree <tag>

But then I'll have to go into each submodule and manually checkout that specific submodule at commit abc1234..

/David

Solution

  • The current commit hash for a submodule is stored in the tree object(s) associated with the commit in the master project. If you do a git ls-tree -r HEAD in your master project, each submodule is represented by a line of the form:

    160000 commit <hash> <path/to/submodule>

    This line indicates the commit in the submodule that should be checked out to match the commit in the master repository.