请问如何更新git项目中的submodle

Question

请教一个问题，a项目中有一个submodle:b，submodle:b更新后，在a项目中执行

git fetch origin
git submodule update

可是a项目中的submodle:b并未更新，求解？

Answer 1

This is the deployment script currently used in our project, FYI
git submodule init
git submodule update
git submodule foreach 'git pull'

Answer 2

Execute git submodule init first
Then git submodule update

Answer 3

Clone project with submodule:

git clone --recursive <remote-url>

Reference

Update project with submodule:

git submodule update --remote

Reference

Modify submodule locally.
Before making any modifications, since the submodule is in the detached state, you need to enter the directory of the submodule and switch to a branch. git checkout <branch-name> If you make any changes later, just commit them in the submodule directory.
Afterwards, when updating the submodule, it can be executed in the repo directory:

git submodule update --remote --rebase

or

git submodule update --remote --merge