Updating submodules in Git - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a Git submodule?

A Git submodule is a repository embedded inside another Git repository. It lets you keep a separate project inside your main project, like a folder that tracks its own history.

beginner

Which command updates all submodules to the commit specified in the main repository?

git submodule update

beginner

How do you initialize submodules after cloning a repository?

Use git submodule init to set up local configuration, then git submodule update to fetch the submodule content.

intermediate

What does the command 'git submodule update --remote' do?

It fetches the latest changes from the remote repository of each submodule and updates the submodule to the latest commit on its tracked branch.

beginner

Why should you run 'git submodule update' after pulling changes in the main repository?

Because the main repository may have updated the submodule commit pointer, so you need to update your submodules to match the new commit.

What command initializes submodules after cloning a repository?

A git submodule fetch

B git submodule update --remote

C git clone --submodules

D git submodule init

git submodule init sets up the local configuration for submodules after cloning.

Which command updates submodules to the commit recorded in the main repository?

A git submodule update

B git submodule init

C git submodule sync

D git submodule status

git submodule update checks out the submodule at the commit specified by the main repo.

How do you update submodules to the latest commit on their remote branches?

A git submodule update

B git submodule init

C git submodule update --remote

D git submodule fetch

The --remote option fetches and updates submodules to the latest remote commit.

What happens if you forget to update submodules after pulling changes?

A Submodules automatically update

B Submodules stay at old commits and may cause inconsistencies

C Git deletes the submodules

D Nothing, submodules are independent

You must update submodules manually to match the main repo's commit pointers.

Which command clones a repository and initializes submodules in one step?

A git clone --recurse-submodules

B git clone --submodules

C git clone --init-submodules

D git clone --update-submodules

The --recurse-submodules option clones and initializes submodules automatically.

Explain the steps to properly update submodules after pulling changes in the main repository.

Think about syncing submodules with the main repo's recorded commits.

Describe the difference between 'git submodule update' and 'git submodule update --remote'.

One updates to a fixed commit, the other to the latest remote commit.