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dex/Documentation/dev-guide.md

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# Dev Guide
## No DB mode
When you are working on dex it's convenient to use the "--no-db" flag, which starts up Dex in a mode which uses an in-memory datastore for persistence. It also does not rotate keys, so no overlord is required.
In this mode you provide the binary with paths to files to connectors and users - there are example files you can use inside of `static/fixtures`, named "connectors.json.sample" and "users.json.sample" respectively. If you rename these to the equivalent without the ".sample", the defaults point to this location, making starting dex as simple as:
`./bin/dex-worker --no-db`
*Do not use this flag in production* - it's not thread safe and data is destroyed when the process dies. In addition, there is no key rotation.
## Building
To build using the go binary on your host, use the `./build` script.
You can also use a copy of `go` hosted inside a Docker container if you prefix your command with `go-docker`, as in: `./go-docker ./build`
## Docker Build and Push
Once binaries are compiled you can build and push a dex image to quay.io. Before doing this step binaries must be built above using one of the build tools.
```
export DOCKER_USER=<<your user>>
export DOCKER_PASSWORD=<<your password>>
./build-docker-push
```
By default the script pushes to `quay.io/coreos/dex`; if you want to push to a different repository, override the `DOCKER_REGISTRY` and `DOCKER_REPO` environment variables.
## Rebuild API from JSON schema
Go API bindings are generated from a JSON Discovery file.
To regenerate run:
```
./schema/generator
```
For updating generator dependencies see docs in: `schema/generator_import.go`.
## Running Tests
To run all tests (except functional) use the `./test` script;
If you want to test a single package only, use `PKG=<pkgname> ./test`
The functional tests require a database; create a database (eg. `createdb dex_func_test`) and then pass it as an environment variable to the functional test script, eg. `DEX_TEST_DSN=postgres://localhost/dex_func_test?sslmode=disable ./test-functional`
To run these tests with Docker is a little trickier; you need to have a container running Postgres, and then you need to link that container to the container running your tests:
```
# Run the Postgres docker container, which creates a db called "postgres"
docker run --name dex_postgres -d postgres
# The host name in the DSN is "postgres"; that works because that is what we
# will alias the link as, which causes Docker to modify /etc/hosts with a "postgres"
# entry.
export DEX_TEST_DSN=postgres://postgres@postgres/postgres?sslmode=disable
# Run the test container, linking it to the Postgres container.
DOCKER_LINKS=dex_postgres:postgres DOCKER_ENV=DEX_TEST_DSN ./go-docker ./test-functional docker
# Remove the container after the tests are run.
rm -f dex_postgres
```