Merge branch 'update-ci-api-docs' into 'master'

Update CI API docs

Since CI is now part of GitLab, it makes sense to group all API related endpoints under
one location. This is a step towards the much awaited issue of doc restructure
https://gitlab.com/gitlab-org/gitlab-ce/issues/3349

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/18404

See merge request !4567

8 files changed, 250 insertions, 222 deletions

diff --git a/doc/api/README.md b/doc/api/README.md
index 27c5962decf..e3fc5a09f21 100644
--- a/doc/api/README.md
+++ b/doc/api/README.md
@@ -8,32 +8,39 @@ under [`/lib/api`](https://gitlab.com/gitlab-org/gitlab-ce/tree/master/lib/api).
 Documentation for various API resources can be found separately in the
 following locations:
 
-- [Users](users.md)
-- [Session](session.md)
-- [Projects](projects.md) including setting Webhooks
-- [Project Snippets](project_snippets.md)
-- [Services](services.md)
-- [Repositories](repositories.md)
-- [Repository Files](repository_files.md)
-- [Commits](commits.md)
-- [Tags](tags.md)
 - [Branches](branches.md)
-- [Merge Requests](merge_requests.md)
+- [Builds](builds.md)
+- [Build triggers](build_triggers.md)
+- [Build Variables](build_variables.md)
+- [Commits](commits.md)
+- [Deploy Keys](deploy_keys.md)
+- [Groups](groups.md)
 - [Issues](issues.md)
+- [Keys](keys.md)
 - [Labels](labels.md)
+- [Merge Requests](merge_requests.md)
 - [Milestones](milestones.md)
-- [Notes](notes.md) (comments)
-- [Deploy Keys](deploy_keys.md)
-- [System Hooks](system_hooks.md)
-- [Groups](groups.md)
+- [Open source license templates](licenses.md)
 - [Namespaces](namespaces.md)
-- [Settings](settings.md)
-- [Keys](keys.md)
-- [Builds](builds.md)
-- [Build triggers](build_triggers.md)
-- [Build Variables](build_variables.md)
+- [Notes](notes.md) (comments)
+- [Projects](projects.md) including setting Webhooks
+- [Project Snippets](project_snippets.md)
+- [Repositories](repositories.md)
+- [Repository Files](repository_files.md)
 - [Runners](runners.md)
-- [Open source license templates](licenses.md)
+- [Services](services.md)
+- [Session](session.md)
+- [Settings](settings.md)
+- [System Hooks](system_hooks.md)
+- [Tags](tags.md)
+- [Users](users.md)
+
+### Internal CI API
+
+The following documentation is for the [internal CI API](ci/README.md):
+
+- [Builds](ci/builds.md)
+- [Runners](ci/runners.md)
 
 ## Authentication
 
diff --git a/doc/api/ci/README.md b/doc/api/ci/README.md
new file mode 100644
index 00000000000..96a281e27c8
--- /dev/null
+++ b/doc/api/ci/README.md
@@ -0,0 +1,24 @@
+# GitLab CI API
+
+## Purpose
+
+The main purpose of GitLab CI API is to provide the necessary data and context
+for GitLab CI Runners.
+
+All relevant information about the consumer API can be found in a
+[separate document](../../api/README.md).
+
+## API Prefix
+
+The current CI API prefix is `/ci/api/v1`.
+
+You need to prepend this prefix to all examples in this documentation, like:
+
+```bash
+GET /ci/api/v1/builds/:id/artifacts
+```
+
+## Resources
+
+- [Builds](builds.md)
+- [Runners](runners.md)
diff --git a/doc/api/ci/builds.md b/doc/api/ci/builds.md
new file mode 100644
index 00000000000..d779463fd8c
--- /dev/null
+++ b/doc/api/ci/builds.md
@@ -0,0 +1,138 @@
+# Builds API
+
+API used by runners to receive and update builds.
+
+>**Note:**
+This API is intended to be used only by Runners as their own
+communication channel. For the consumer API see the
+[Builds API](../builds.md).
+
+## Authentication
+
+This API uses two types of authentication:
+
+1. Unique Runner's token which is the token assigned to the Runner after it
+   has been registered.
+
+2. Using the build authorization token.
+   This is project's CI token that can be found under the **Builds** section of
+   a project's settings. The build authorization token can be passed as a
+   parameter or a value of `BUILD-TOKEN` header.
+
+These two methods of authentication are interchangeable.
+
+## Builds
+
+### Runs oldest pending build by runner
+
+```
+POST /ci/api/v1/builds/register
+```
+
+| Attribute | Type    | Required | Description         |
+|-----------|---------|----------|---------------------|
+| `token`   | string  | yes      | Unique runner token |
+
+
+```
+curl -X POST "https://gitlab.example.com/ci/api/v1/builds/register" -F "token=t0k3n"
+```
+
+### Update details of an existing build
+
+```
+PUT /ci/api/v1/builds/:id
+```
+
+| Attribute | Type    | Required | Description          |
+|-----------|---------|----------|----------------------|
+| `id`      | integer | yes      | The ID of a project  |
+| `token`   | string  | yes      | Unique runner token  |
+| `state`   | string  | no       | The state of a build |
+| `trace`   | string  | no       | The trace of a build |
+
+```
+curl -X PUT "https://gitlab.example.com/ci/api/v1/builds/1234" -F "token=t0k3n" -F "state=running" -F "trace=Running git clone...\n"
+```
+
+### Incremental build trace update
+
+Using this method you need to send trace content as a request body. You also need to provide the `Content-Range` header
+with a range of sent trace part. Note that you need to send parts in the proper order, so the begining of the part
+must start just after the end of the previous part. If you provide the wrong part, then GitLab CI API will return `416
+Range Not Satisfiable` response with a header `Range: 0-X`, where `X` is the current trace length.
+
+For example, if you receive `Range: 0-11` in the response, then your next part must contain a `Content-Range: 11-...`
+header and a trace part covered by this range.
+
+For a valid update API will return `202` response with:
+* `Build-Status: {status}` header containing current status of the build,
+* `Range: 0-{length}` header with the current trace length.
+
+```
+PATCH /ci/api/v1/builds/:id/trace.txt
+```
+
+Parameters:
+
+| Attribute | Type    | Required | Description          |
+|-----------|---------|----------|----------------------|
+| `id`      | integer | yes      | The ID of a build    |
+
+Headers:
+
+| Attribute       | Type    | Required | Description                       |
+|-----------------|---------|----------|-----------------------------------|
+| `BUILD-TOKEN`   | string  | yes      | The build authorization token     |
+| `Content-Range` | string  | yes      | Bytes range of trace that is sent |
+
+```
+curl -X PATCH "https://gitlab.example.com/ci/api/v1/builds/1234/trace.txt" -H "BUILD-TOKEN=build_t0k3n" -H "Content-Range=0-21" -d "Running git clone...\n"
+```
+
+
+### Upload artifacts to build
+
+```
+POST /ci/api/v1/builds/:id/artifacts
+```
+
+| Attribute | Type    | Required | Description                   |
+|-----------|---------|----------|-------------------------------|
+| `id`      | integer | yes      | The ID of a build             |
+| `token`   | string  | yes      | The build authorization token |
+| `file`    | mixed   | yes      | Artifacts file                |
+
+```
+curl -X POST "https://gitlab.example.com/ci/api/v1/builds/1234/artifacts" -F "token=build_t0k3n" -F "file=@/path/to/file"
+```
+
+### Download the artifacts file from build
+
+```
+GET /ci/api/v1/builds/:id/artifacts
+```
+
+| Attribute | Type    | Required | Description                   |
+|-----------|---------|----------|-------------------------------|
+| `id`      | integer | yes      | The ID of a build             |
+| `token`   | string  | yes      | The build authorization token |
+
+```
+curl "https://gitlab.example.com/ci/api/v1/builds/1234/artifacts" -F "token=build_t0k3n"
+```
+
+### Remove the artifacts file from build
+
+```
+DELETE /ci/api/v1/builds/:id/artifacts
+```
+
+| Attribute | Type    | Required | Description                   |
+|-----------|---------|----------|-------------------------------|
+| ` id`     | integer | yes      | The ID of a build             |
+| `token`   | string  | yes      | The build authorization token |
+
+```
+curl -X DELETE "https://gitlab.example.com/ci/api/v1/builds/1234/artifacts" -F "token=build_t0k3n"
+```
diff --git a/doc/api/ci/runners.md b/doc/api/ci/runners.md
new file mode 100644
index 00000000000..96b3c42f773
--- /dev/null
+++ b/doc/api/ci/runners.md
@@ -0,0 +1,57 @@
+# Runners API
+
+API used by Runners to register and delete themselves.
+
+>**Note:**
+This API is intended to be used only by Runners as their own
+communication channel. For the consumer API see the
+[new Runners API](../runners.md).
+
+## Authentication
+
+This API uses two types of authentication:
+
+1. Unique Runner's token, which is the token assigned to the Runner after it
+   has been registered.
+
+2. Using Runners' registration token.
+   This is a token that can be found in project's settings.
+   It can also be found in the **Admin > Runners** settings area.
+   There are two types of tokens you can pass: shared Runner registration
+   token or project specific registration token.
+
+## Register a new runner
+
+Used to make GitLab CI aware of available runners.
+
+```sh
+POST /ci/api/v1/runners/register
+```
+
+| Attribute | Type    | Required  | Description |
+| --------- | ------- | --------- | ----------- |
+| `token`   | string  | yes       | Runner's registration token |
+
+Example request:
+
+```sh
+curl -X POST "https://gitlab.example.com/ci/api/v1/runners/register" -F "token=t0k3n"
+```
+
+## Delete a Runner
+
+Used to remove a Runner.
+
+```sh
+DELETE /ci/api/v1/runners/delete
+```
+
+| Attribute | Type    | Required  | Description |
+| --------- | ------- | --------- | ----------- |
+| `token`   | string  | yes       | Runner's registration token |
+
+Example request:
+
+```sh
+curl -X DELETE "https://gitlab.example.com/ci/api/v1/runners/delete" -F "token=t0k3n"
+```
diff --git a/doc/ci/README.md b/doc/ci/README.md
index 4abc45bf9bb..ef72df97ce6 100644
--- a/doc/ci/README.md
+++ b/doc/ci/README.md
@@ -14,5 +14,5 @@
 - [Trigger builds through the API](triggers/README.md)
 - [Build artifacts](build_artifacts/README.md)
 - [User permissions](permissions/README.md)
-- [API](api/README.md)
+- [API](../../api/ci/README.md)
 - [CI services (linked docker containers)](services/README.md)
diff --git a/doc/ci/api/README.md b/doc/ci/api/README.md
index aea808007fc..4ca8d92d7cc 100644
--- a/doc/ci/api/README.md
+++ b/doc/ci/api/README.md
@@ -1,22 +1,3 @@
 # GitLab CI API
 
-## Purpose
-
-Main purpose of GitLab CI API is to provide necessary data and context for
-GitLab CI Runners.
-
-For consumer API take a look at this [documentation](../../api/README.md) where
-you will find all relevant information.
-
-## API Prefix
-
-Current CI API prefix is `/ci/api/v1`.
-
-You need to prepend this prefix to all examples in this documentation, like:
-
-    GET /ci/api/v1/builds/:id/artifacts
-
-## Resources
-
-- [Builds](builds.md)
-- [Runners](runners.md)
+This document was moved to a [new location](../../api/ci/README.md).
diff --git a/doc/ci/api/builds.md b/doc/ci/api/builds.md
index 79761a893da..f5bd3181c02 100644
--- a/doc/ci/api/builds.md
+++ b/doc/ci/api/builds.md
@@ -1,139 +1,3 @@
 # Builds API
 
-API used by runners to receive and update builds.
-
-_**Note:** This API is intended to be used only by Runners as their own
-communication channel. For the consumer API see the
-[Builds API](../../api/builds.md)._
-
-## Authentication
-
-This API uses two types of authentication:
-
-1.   Unique runner's token
-
-     Token assigned to runner after it has been registered.
-
-2.   Using build authorization token
-
-     This is project's CI token that can be found in Continuous Integration
-     project settings.
-
-     Build authorization token can be passed as a parameter or a value of
-     `BUILD-TOKEN` header. This method are interchangeable.
-
-## Builds
-
-### Runs oldest pending build by runner
-
-```
-POST /ci/api/v1/builds/register
-```
-
-| Attribute | Type    | Required | Description         |
-|-----------|---------|----------|---------------------|
-| `token`   | string  | yes      | Unique runner token |
-
-
-```
-curl -X POST "https://gitlab.example.com/ci/api/v1/builds/register" -F "token=t0k3n"
-```
-
-### Update details of an existing build
-
-```
-PUT /ci/api/v1/builds/:id
-```
-
-| Attribute | Type    | Required | Description          |
-|-----------|---------|----------|----------------------|
-| `id`      | integer | yes      | The ID of a project  |
-| `token`   | string  | yes      | Unique runner token  |
-| `state`   | string  | no       | The state of a build |
-| `trace`   | string  | no       | The trace of a build |
-
-```
-curl -X PUT "https://gitlab.example.com/ci/api/v1/builds/1234" -F "token=t0k3n" -F "state=running" -F "trace=Running git clone...\n"
-```
-
-### Incremental build trace update
-
-Using this method you need to send trace content as a request body. You also need to provide the `Content-Range` header
-with a range of sent trace part. Note that you need to send parts in the proper order, so the begining of the part
-must start just after the end of the previous part. If you provide the wrong part, then GitLab CI API will return `416
-Range Not Satisfiable` response with a header `Range: 0-X`, where `X` is the current trace length.
-
-For example, if you receive `Range: 0-11` in the response, then your next part must contain a `Content-Range: 11-...`
-header and a trace part covered by this range.
-
-For a valid update API will return `202` response with:
-* `Build-Status: {status}` header containing current status of the build,
-* `Range: 0-{length}` header with the current trace length.
-
-```
-PATCH /ci/api/v1/builds/:id/trace.txt
-```
-
-Parameters:
-
-| Attribute | Type    | Required | Description          |
-|-----------|---------|----------|----------------------|
-| `id`      | integer | yes      | The ID of a build    |
-
-Headers:
-
-| Attribute       | Type    | Required | Description                       |
-|-----------------|---------|----------|-----------------------------------|
-| `BUILD-TOKEN`   | string  | yes      | The build authorization token     |
-| `Content-Range` | string  | yes      | Bytes range of trace that is sent |
-
-```
-curl -X PATCH "https://gitlab.example.com/ci/api/v1/builds/1234/trace.txt" -H "BUILD-TOKEN=build_t0k3n" -H "Content-Range=0-21" -d "Running git clone...\n"
-```
-
-
-### Upload artifacts to build
-
-```
-POST /ci/api/v1/builds/:id/artifacts
-```
-
-| Attribute | Type    | Required | Description                   |
-|-----------|---------|----------|-------------------------------|
-| `id`      | integer | yes      | The ID of a build             |
-| `token`   | string  | yes      | The build authorization token |
-| `file`    | mixed   | yes      | Artifacts file                |
-
-```
-curl -X POST "https://gitlab.example.com/ci/api/v1/builds/1234/artifacts" -F "token=build_t0k3n" -F "file=@/path/to/file"
-```
-
-### Download the artifacts file from build
-
-```
-GET /ci/api/v1/builds/:id/artifacts
-```
-
-| Attribute | Type    | Required | Description                   |
-|-----------|---------|----------|-------------------------------|
-| `id`      | integer | yes      | The ID of a build             |
-| `token`   | string  | yes      | The build authorization token |
-
-```
-curl "https://gitlab.example.com/ci/api/v1/builds/1234/artifacts" -F "token=build_t0k3n"
-```
-
-### Remove the artifacts file from build
-
-```
-DELETE /ci/api/v1/builds/:id/artifacts
-```
-
-| Attribute | Type    | Required | Description                   |
-|-----------|---------|----------|-------------------------------|
-| ` id`     | integer | yes      | The ID of a build             |
-| `token`   | string  | yes      | The build authorization token |
-
-```
-curl -X DELETE "https://gitlab.example.com/ci/api/v1/builds/1234/artifacts" -F "token=build_t0k3n"
-```
+This document was moved to a [new location](../../api/ci/builds.md).
diff --git a/doc/ci/api/runners.md b/doc/ci/api/runners.md
index 2f01da4bd76..b14ea99db76 100644
--- a/doc/ci/api/runners.md
+++ b/doc/ci/api/runners.md
@@ -1,46 +1,3 @@
 # Runners API
 
-API used by runners to register and delete themselves.
-
-_**Note:** This API is intended to be used only by Runners as their own
-communication channel. For the consumer API see the
-[new Runners API](../../api/runners.md)._
-
-## Authentication
-
-This API uses two types of authentication:
-
-1.   Unique runner's token
-
-     Token assigned to runner after it has been registered.
-
-2.   Using runners' registration token
-
-     This is a token that can be found in project's settings.
-     It can be also found in Admin area » Runners settings.
-
-     There are two types of tokens you can pass - shared runner registration
-     token or project specific registration token.
-
-## Runners
-
-### Register a new runner
-
-Used to make GitLab CI aware of available runners.
-
-    POST /ci/api/v1/runners/register
-
-Parameters:
-
-  * `token` (required) - Registration token
-
-
-### Delete a runner
-
-Used to remove runner.
-
-    DELETE /ci/api/v1/runners/delete
-
-Parameters:
-
-  * `token` (required) - Unique runner token
+This document was moved to a [new location](../../api/ci/runners.md).