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Commit cd9e70e7 authored by Lukas Riedel's avatar Lukas Riedel
Browse files

Add for submodules

This is basically copied from Utopia
parent e0c1b445
# Developers' short introduction to Git Submodules
Submodules work like every other Git repository, but are tracked in their
'superproject'. The superproject stores information on its submodules in the
`.gitmodules` file in the top-level directory and simply records a commit SHA
for any submodule.
### Updating a submodule locally
If you updated the code base of your 'superproject' by calling `git pull`
or `git checkout <branch>`, the submodule commit SHA might have changed. Git
_will not_ automatically update the submodule, but you have to do so manually
by calling
git submodule update
### Upgrading the submodule
If you wish to use a new commit/branch/tag of a submodule, you can enter it and
use the regular Git commands. If you return to your superproject, it will notice
your changes. Use
git diff [--cached] --submodule
to see a list of commits that update the submodule. To always enable this view
when calling `git diff`, update your machine's global git config via
git config --global diff.submodule log
You can add the changes in the submodule via the usual Git workflow by calling
git add <path/to/submodule>
and commit them afterwards. Other users pulling your commit will then need to
call `git submodule update` to receive the changes.
### Submodules tracking a branch
Submodules always resemble a repository in "detached HEAD" state. Even when
tracking a certain _branch_, submodules will always point at a certain _commit_.
If you which to pull updates from upstream, enter the submodule and call
`git pull`. _Notice that this change has to be committed in the superproject!_
## Current submodule setup
Submodules checking out tags instead of branches to not need regular remote
updates. See the list below for the current setup.
| Software | Checkout | Branch? |
| -------- | -------- | ------- |
| spdlog | `v1.1.0` | No |
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