67 lines
2.4 KiB
Markdown
67 lines
2.4 KiB
Markdown
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# Dependency Management
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[`dep`](https://github.com/golang/dep) is a tool of choice when it comes to dependency management.
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## How we use `dep`.
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1. Transitive dependencies of `go-ethereum`. The most important thing for us is
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to be in-sync there. We want to reduce the regression scope.
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Hence, we pin down all the dependencies of `go-ethereum` with SHAs in `Gopkg.toml` when
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importing a new version of upstream. (This is considered a bad practice for
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`dep` but we are willing to take the risk to keep consitency with the upstream).
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2. Exclusive `status-go` dependencies. The policy there is to keep them as
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fresh as possible. Hence, no constraints for them in the `toml` file.
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## Installing `dep`
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`go get -u github.com/golang/dep/cmd/dep`
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## Docs (worth reading)
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1. [README](https://github.com/golang/dep/blob/master/README.md)
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2. [F.A.Q.](https://github.com/golang/dep/blob/master/docs/FAQ.md)
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## Checking-out all dependencies
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`dep ensure` - download all the dependencies based on `Gopkg.lock`.
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`Gopkg.lock` is kept inact if it is in-sync with `Gopkg.toml`. If the `toml`
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file is changed, `dep ensure` will re-generate `Gopkg.lock` as well.
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## Adding a new Dependency
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(see [Adding a new dependency](https://github.com/golang/dep#adding-a-dependency))
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1. `$ dep ensure -add github.com/foo/bar`
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2. Commit changes.
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## Updating a dependency
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(see: [Changing a Dependency](https://github.com/golang/dep#changing-dependencies))
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1. Update constraint in the `Gopkg.toml` file if needed.
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2. Run `dep ensure -update github.com/foo/bar`
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3. Commit changes.
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## Updating all dependencies
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`dep ensure -update`
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## Updating `Geth`
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1. Update `develop` branch in [`status-im/go-ethereum`](https://github.com/status-im/go-ethereum/tree/develop).
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2. Update the `go-ethereum` dependency: `dep ensure -v -update github.com/ethereum/go-ethereum`.
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3. Make sure that `[[constraint]]` statements in `status-go/Gopkg.toml` contains the same SHAs as `go-ethereum/vendor/vendor.json`.
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4. Update vendor files in `status-go`, running `dep ensure`.
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5. Commit `Gopkg.lock`, `Gopkg.toml` and `vendor` directories.
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## Commiting changes
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Make sure that you don't commit unnecessary changes to `Gopkg.toml` and
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`Gopkg.lock`.
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## Common issues
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1. Relative imports and "Could not introduce package, as its subpackage does not contain usable Go code". See [this comment](https://github.com/golang/dep/issues/899#issuecomment-317904001) for more information.
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