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https://github.com/tools/godep

dependency tool for go
https://github.com/tools/godep

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dependency tool for go

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# Godep - Archived



Please use [dep](https://github.com/golang/dep) or another tool instead.



The rest of this readme is preserved for those that may still need its contents.



[![Build Status](https://travis-ci.org/tools/godep.svg)](https://travis-ci.org/tools/godep)



[![GoDoc](https://godoc.org/github.com/tools/godep?status.svg)](https://godoc.org/github.com/tools/godep)



godep helps build packages reproducibly by fixing their dependencies.



This tool assumes you are working in a standard Go workspace, as described [here](http://golang.org/doc/code.html). We

expect godep to build on Go 1.4* or newer, but you can use it on any project that works with Go 1 or newer.



Please check the [FAQ](FAQ.md) if you have a question.



## Golang Dep



The Go community now has the [dep](https://github.com/golang/dep) project to

manage dependencies. Please consider trying to migrate from Godep to dep. If there

is an issue preventing you from migrating please file an issue with dep so the

problem can be corrected. Godep will continue to be supported for some time but

is considered to be in a state of support rather than active feature development.



## Install



```console

go get github.com/tools/godep

```



## How to use godep with a new project



Assuming you've got everything working already, so you can build your project

with `go install` and test it with `go test`, it's one command to start using:



```console

godep save

```



This will save a list of dependencies to the file `Godeps/Godeps.json` and copy

their source code into `vendor/` (or `Godeps/_workspace/` when using older

versions of Go). Godep does **not copy**:



- files from source repositories that are not tracked in version control.

- `*_test.go` files.

- `testdata` directories.

- files outside of the go packages.



Godep does not process the imports of `.go` files with either the `ignore`

or `appengine` build tags.



Test files and testdata directories can be saved by adding `-t`.



Read over the contents of `vendor/` and make sure it looks reasonable. Then

commit the `Godeps/` and `vendor/` directories to version control.



## The deprecated `-r` flag



For older versions of Go, the `-r` flag tells save to automatically rewrite

package import paths. This allows your code to refer directly to the copied

dependencies in `Godeps/_workspace`. So, a package C that depends on package

D will actually import `C/Godeps/_workspace/src/D`. This makes C's repo

self-contained and causes `go get` to build C with the right version of all

dependencies.



If you don't use `-r`, when using older version of Go, then in order to use the

fixed dependencies and get reproducible builds, you must make sure that **every

time** you run a Go-related command, you wrap it in one of these two ways:



- If the command you are running is just `go`, run it as `godep go ...`, e.g.

  `godep go install -v ./...`

- When using a different command, set your `$GOPATH` using `godep path` as

  described below.



`-r` isn't necessary with go1.6+ and isn't allowed.



## Additional Operations



### Restore



The `godep restore` installs the

package versions specified in `Godeps/Godeps.json` to your `$GOPATH`. This

modifies the state of packages in your `$GOPATH`. NOTE: `godep restore` leaves

git repositories in a detached state. `go1.6`+ no longer checks out the master

branch when doing a `go get`, see [here](https://github.com/golang/go/commit/42206598671a44111c8f726ad33dc7b265bdf669).



> If you run `godep restore` in your main `$GOPATH` `go get -u` will fail on packages that are behind master.



Please see the [FAQ](https://github.com/tools/godep/blob/master/FAQ.md#should-i-use-godep-restore) section about restore.



### Edit-test Cycle



1. Edit code

1. Run `godep go test`

1. (repeat)



### Add a Dependency



To add a new package foo/bar, do this:



1. Run `go get foo/bar`

1. Edit your code to import foo/bar.

1. Run `godep save` (or `godep save ./...`).



### Update a Dependency



To update a package from your `$GOPATH`, do this:



1. Run `go get -u foo/bar`

1. Run `godep update foo/bar`.



You can use the `...` wildcard, for example `godep update foo/...`. Before comitting the change, you'll probably want to

inspect the changes to Godeps, for example with `git diff`, and make sure it looks reasonable.



## Multiple Packages



If your repository has more than one package, you're probably accustomed to

running commands like `go test ./...`, `go install ./...`, and `go fmt ./...`.

Similarly, you should run `godep save ./...` to capture the dependencies of all

packages in your application.



## File Format



Godeps is a json file with the following structure:



```go

type Godeps struct {

  ImportPath   string

  GoVersion    string   // Abridged output of 'go version'.

  GodepVersion string   // Abridged output of 'godep version'

  Packages     []string // Arguments to godep save, if any.

  Deps         []struct {

    ImportPath string

    Comment    string // Description of commit, if present.

    Rev        string // VCS-specific commit ID.

  }

}

```



Example Godeps:



```json

{

  "ImportPath": "github.com/kr/hk",

  "GoVersion": "go1.6",

  "Deps": [

    {

      "ImportPath": "code.google.com/p/go-netrc/netrc",

      "Rev": "28676070ab99"

    },

    {

      "ImportPath": "github.com/kr/binarydist",

      "Rev": "3380ade90f8b0dfa3e363fd7d7e941fa857d0d13"

    }

  ]

}

```



## Migrating to vendor/



Godep supports the Go 1.5+ vendor/

[experiment](https://github.com/golang/go/commit/183cc0cd41f06f83cb7a2490a499e3f9101befff)

utilizing the same environment variable that the go tooling itself supports

(`GO15VENDOREXPERIMENT`).



godep mostly works the same way as the `go` command line tool. If you have go

1.5.X and set `GO15VENDOREXPERIMENT=1` or have go1.6.X (or devel) `vendor/`

is enabled. **Unless** you already have a `Godeps/_workspace`. This is a safety

feature and godep warns you about this.



When `vendor/` is enabled godep will write the vendored code into the top level

`./vendor/` directory. A `./Godeps/Godeps.json` file is created to track

the dependencies and revisions. `vendor/` is not compatible with rewrites.



There is currently no automated migration between the old Godeps workspace and

the vendor directory, but the following steps should work:



```term

# just to be safe

$ unset GO15VENDOREXPERIMENT



# restore currently vendored deps to the $GOPATH

$ godep restore



# The next line is only needed to automatically undo rewritten imports that were

# created with godep save -r.

$ godep save -r=false 



# Remove the old Godeps folder

$ rm -rf Godeps



# If on go1.5.X to enable `vendor/`

$ export GO15VENDOREXPERIMENT=1



# re-analyze deps and save to `vendor/`.

$ godep save 



# Add the changes to your VCS

$ git add -A . ; git commit -am "Godep workspace -> vendor/"



# You should see your Godeps/_workspace/src files "moved" to vendor/.

```



## Releasing



1. Increment the version in `version.go`.

1. Tag the commit with the same version number.

1. Update `Changelog.md`.