153 lines
6.1 KiB
Markdown
153 lines
6.1 KiB
Markdown
<!--[metadata]>
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+++
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title = "Build instructions"
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description = "Explains how to build & hack on the registry"
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keywords = ["registry, on-prem, images, tags, repository, distribution, build, recipe, advanced"]
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+++
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<![end-metadata]-->
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# Building the registry source
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## Use-case
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This is useful if you intend to actively work on the registry.
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### Alternatives
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Most people should use the [official Registry docker image](https://hub.docker.com/r/library/registry/).
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People looking for advanced operational use cases might consider rolling their own image with a custom Dockerfile inheriting `FROM registry:2`.
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OS X users who want to run natively can do so following [the instructions here](osx-setup-guide.md).
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### Gotchas
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You are expected to know your way around with go & git.
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If you are a casual user with no development experience, and no preliminary knowledge of go, building from source is probably not a good solution for you.
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## Build the development environment
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The first prerequisite of properly building distribution targets is to have a Go
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development environment setup. Please follow [How to Write Go Code](https://golang.org/doc/code.html)
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for proper setup. If done correctly, you should have a GOROOT and GOPATH set in the
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environment.
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If a Go development environment is setup, one can use `go get` to install the
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`registry` command from the current latest:
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go get github.com/docker/distribution/cmd/registry
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The above will install the source repository into the `GOPATH`.
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Now create the directory for the registry data (this might require you to set permissions properly)
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mkdir -p /var/lib/registry
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... or alternatively `export REGISTRY_STORAGE_FILESYSTEM_ROOTDIRECTORY=/somewhere` if you want to store data into another location.
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The `registry`
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binary can then be run with the following:
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$ $GOPATH/bin/registry --version
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$GOPATH/bin/registry github.com/docker/distribution v2.0.0-alpha.1+unknown
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> __NOTE:__ While you do not need to use `go get` to checkout the distribution
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> project, for these build instructions to work, the project must be checked
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> out in the correct location in the `GOPATH`. This should almost always be
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> `$GOPATH/src/github.com/docker/distribution`.
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The registry can be run with the default config using the following
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incantation:
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$ $GOPATH/bin/registry serve $GOPATH/src/github.com/docker/distribution/cmd/registry/config-example.yml
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INFO[0000] endpoint local-5003 disabled, skipping app.id=34bbec38-a91a-494a-9a3f-b72f9010081f version=v2.0.0-alpha.1+unknown
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INFO[0000] endpoint local-8083 disabled, skipping app.id=34bbec38-a91a-494a-9a3f-b72f9010081f version=v2.0.0-alpha.1+unknown
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INFO[0000] listening on :5000 app.id=34bbec38-a91a-494a-9a3f-b72f9010081f version=v2.0.0-alpha.1+unknown
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INFO[0000] debug server listening localhost:5001
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If it is working, one should see the above log messages.
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### Repeatable Builds
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For the full development experience, one should `cd` into
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`$GOPATH/src/github.com/docker/distribution`. From there, the regular `go`
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commands, such as `go test`, should work per package (please see
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[Developing](#developing) if they don't work).
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A `Makefile` has been provided as a convenience to support repeatable builds.
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Please install the following into `GOPATH` for it to work:
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go get github.com/tools/godep github.com/golang/lint/golint
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**TODO(stevvooe):** Add a `make setup` command to Makefile to run this. Have to think about how to interact with Godeps properly.
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Once these commands are available in the `GOPATH`, run `make` to get a full
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build:
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$ GOPATH=`godep path`:$GOPATH make
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+ clean
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+ fmt
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+ vet
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+ lint
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+ build
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github.com/docker/docker/vendor/src/code.google.com/p/go/src/pkg/archive/tar
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github.com/Sirupsen/logrus
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github.com/docker/libtrust
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...
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github.com/yvasiyarov/gorelic
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github.com/docker/distribution/registry/handlers
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github.com/docker/distribution/cmd/registry
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+ test
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...
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ok github.com/docker/distribution/digest 7.875s
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ok github.com/docker/distribution/manifest 0.028s
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ok github.com/docker/distribution/notifications 17.322s
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? github.com/docker/distribution/registry [no test files]
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ok github.com/docker/distribution/registry/api/v2 0.101s
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? github.com/docker/distribution/registry/auth [no test files]
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ok github.com/docker/distribution/registry/auth/silly 0.011s
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...
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+ /Users/sday/go/src/github.com/docker/distribution/bin/registry
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+ /Users/sday/go/src/github.com/docker/distribution/bin/registry-api-descriptor-template
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+ binaries
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The above provides a repeatable build using the contents of the vendored
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Godeps directory. This includes formatting, vetting, linting, building,
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testing and generating tagged binaries. We can verify this worked by running
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the registry binary generated in the "./bin" directory:
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$ ./bin/registry -version
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./bin/registry github.com/docker/distribution v2.0.0-alpha.2-80-g16d8b2c.m
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### Developing
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The above approaches are helpful for small experimentation. If more complex
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tasks are at hand, it is recommended to employ the full power of `godep`.
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The Makefile is designed to have its `GOPATH` defined externally. This allows
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one to experiment with various development environment setups. This is
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primarily useful when testing upstream bugfixes, by modifying local code. This
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can be demonstrated using `godep` to migrate the `GOPATH` to use the specified
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dependencies. The `GOPATH` can be migrated to the current package versions
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declared in `Godeps` with the following command:
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godep restore
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> **WARNING:** This command will checkout versions of the code specified in
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> Godeps/Godeps.json, modifying the contents of `GOPATH`. If this is
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> undesired, it is recommended to create a workspace devoted to work on the
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> _Distribution_ project.
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With a successful run of the above command, one can now use `make` without
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specifying the `GOPATH`:
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make
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If that is successful, standard `go` commands, such as `go test` should work,
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per package, without issue.
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### Optional build tags
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Optional [build tags](http://golang.org/pkg/go/build/) can be provided using
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the environment variable `DOCKER_BUILDTAGS`.
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