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Explain how to work with subrepos

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Oliver Scherer 2020-04-01 13:19:11 +02:00
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CONTRIBUTING.md
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@ -188,7 +188,53 @@ with one another are rolled up.
Speaking of tests, Rust has a comprehensive test suite. More information about
it can be found [here][rctd].
### External Dependencies
### External Dependencies (subrepo)
As a developer to this repository, you don't have to treat the following external projects
differently from other crates that are directly in this repo:
* none so far, see https://github.com/rust-lang/rust/issues/70651 for more info
They are just regular files and directories. This is in contrast to `submodule` dependencies
(see below for those).
If you want to synchronize or otherwise work with subrepos, install the `git subrepo` command via
instructions found at https://github.com/ingydotnet/git-subrepo
#### Synchronizing a subrepo
There are two synchronization directions: `subrepo push` and `subrepo pull`. Both operations create
a synchronization commit in the rustc repo.
This commit is very important in order to make future synchronizations work.
Do not rebase this commit under any circumstances.
Prefer to merge in case of conflicts or redo the operation if you really need to rebase.
A `git subrepo push src/tools/clippy`
takes all the changes that
happened to the copy in this repo and creates commits on the remote repo that match the local
changes (so every local commit that touched the subrepo causes a commit on the remote repo).
A `git subrepo pull src/tools/clippy` takes all changes since the last `subrepo pull` from the clippy
repo and creates a single commit in the rustc repo with all the changes.
#### Creating a new subrepo dependency
If you want to create a new subrepo dependency from an existing repository, call (from this
repository's root directory!!)
```
git subrepo clone https://github.com/rust-lang/rust-clippy.git src/tools/clippy
```
This will create a new commit, which you may not rebase under any circumstances! Delete the commit
and redo the operation if you need to rebase.
Now you're done, the `src/tools/clippy` directory behaves as if clippy were part of the rustc
monorepo, so no one but you (or others that synchronize subrepos) needs to have `git subrepo`
installed.
### External Dependencies (submodules)
Currently building Rust will also build the following external projects:
@ -221,7 +267,6 @@ before the PR is merged.
Rust's build system builds a number of tools that make use of the
internals of the compiler. This includes
[Clippy](https://github.com/rust-lang/rust-clippy),
[RLS](https://github.com/rust-lang/rls) and
[rustfmt](https://github.com/rust-lang/rustfmt). If these tools
break because of your changes, you may run into a sort of "chicken and egg"