git - Get the current commit id of specified submodule

Question

I want get the current commit id of the specified submodule. I thought when I cd into submodule directory and run git rev-parse HEAD i get this after I noticed this is a superproject current id. Tried git submodule status | grep <submodule_name> also but its to slow to me. Any idea how to get this information little bit faster?

Answer 1

You can start with git ls-files -s (as in this answer)

cd /path/to/parent/repo
git ls-files -s yourSubmodule

Note the absence of a trailing '/' after yourSubmodule (which is the root folder of the checked out submodule)

That will give the mode and sha1 associated with the gitlink (special entry in the index of the parent repo)

160000 4d77d23305c5623356955ef9f908f4ec76780ba9 0       yourSubmodule

(The '0' is for the stage number)

Alternatives:

cd /path/to/repo/parentFolder/of/submodule

git ls-tree @ yourSubmodule
git rev-parse @:./yourSubmodule

The rev-parse only returns the submodule SHA1.

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As commented by heloman, you can also find the SHA1 with:

git rev-parse HEAD:path-to-your-sub-module

See more in "How to see which commit a git submodule points at".