What is the point of 'git submodule init'?

Background

To populate a repository’s submodules, one typically invokes:

git submodule init
git submodule update

In this usage, git submodule init seems to do only one thing: populate .git/config with information that is already in .gitmodules.

What is the point of that?

Couldn’t git submodule update simply use the information from .gitmodules? This would avoid both:

  • an unnecessary command (git submodule init); and
  • an unnecessary duplication of data (.gitmodules content into .git/config).

Question

Either:

  • there are use-cases for git submodule init that I do not know (in which case, please enlighten me!); or else
  • git submodule init is cruft that could be deprecated in Git without any harm.

Which of these is true?

One Solution collect form web for “What is the point of 'git submodule init'?”

Reading the git submodule documentation, there is a use-case that ostensibly justifies the existence of git init as a standalone command.

If a user who has cloned a repository wishes to use a different URL for a submodule than is specified by the upstream repository, then that user can:

git submodule init
vim .git/config # Alter submodule URL as desired, without changing .gitmodules
                # or polluting history.
git submodule update
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