# Status Patches to for geth (go-ethereum)
---

Status-go uses [go-ethereum](https://github.com/ethereum/go-ethereum) (**upstream**) as its dependency. As any other Go dependency `go-ethereum` code is vendored and stored in `vendor/` folder.

However, there are a few changes has been made to the upstream, that are specific to Status and should not be merged to the upstream. We keep those changes as a set of patches, that can be applied upon each next release of `go-ethereum`. Patched version of `go-ethereum` is available in the [status-im/go-ethereum](https://github.com/status/go-ethereum) repo.

We try to minimize number and amount of changes in those patches as much as possible, and whereas possible, to contribute changes into the upstream.

# Patches

 - [`0000-accounts-hd-keys.patch`](./0000-accounts-hd-keys.patch) — adds support for HD extended keys (links/docs?)
 - [`0002-les-api-status.patch`](./0002-les-api-status.patch) — adds StatusBackend into LES code (need to be inspected, some things can and should be done outside of les code
 - [`0003-dockerfiles-wnode-swarm.patch`](./0003-dockerfiles-wnode-swarm.patch) — adds Dockerfiles (who uses this?)
 - [`0004-whisper-notifications.patch`](./0004-whisper-notifications.patch) — adds Whisper notifications (need to be reviewed and documented)
 - [`0006-latest-cht.patch`](./0006-latest-cht.patch) – updates CHT root hashes, should be updated regularly to keep sync fast, until proper Trusted Checkpoint sync is not implemented as part of LES/2 protocol.
 - [`0007-README.patch`](./0007-README.patch) — update upstream README.md.
 - [`0010-geth-17-fix-npe-in-filter-system.patch`](./0010-geth-17-fix-npe-in-filter-system.patch) - Temp patch for 1.7.x to fix a NPE in the filter system.
# Updating upstream version

When a new stable release of `go-ethereum` comes out, we need to upgrade our fork and vendored copy.

**Note: The process is completely repeatable, so it's safe to remove current `go-ethereum` directory, clone latest upstream version and apply patches from scratch.**

### Using existing fork repo (recommended)

#### I. In our fork at /status-im/go-ethereum.

1. Remove the local `develop` branch.
```bash
git branch -D develop
```

2. Pull upstream release branch into `develop` branch.
```bash
git pull git@github.com:ethereum/go-ethereum.git <release_branch>:develop
```
In our case `<release_branch>` would be `release/1.7` because the current stable version is
1.7.x.

3. Apply patches
```bash
for patch in $GOPATH/src/github.com/status-im/status-go/geth-patches/*.patch;
do
    patch -p1 < $patch;
done
```

Once patches applied, you might want to inspect changes between current vendored version and newly patched version by this command:
```bash
diff -Nru -x "*_test.go" -x "vendor" -x ".git" -x "tests" -x "build" --brief $GOPATH/src/github.com/status-im/go-ethereum $GOPATH/src/github.com/status-im/status-go/vendor/github.com/ethereum/go-ethereum
```

4. Push `develop` branch to our remote, rewriting history
```bash
git push -f origin develop
```

#### II. In status-go repository

1. Update vendored `go-ethereum` (note that we use upstream's address there, we override the download link to our fork address in `Gopkg.toml`)
```bash
dep ensure --update github.com/ethereum/go-ethereum
```

`Gopkg.lock` will change and files within `vendor/ethereum/go-ethereum`.

2. Run tests
```bash
make ci
```

3. Commit & push changes, create a PR