Integrate custom tasks into Pipelines

A PipelineTask now can reference a custom task.  This causes the PipelineRun reconciler to create a Run instead of a TaskRun.
Pipeline parameters can be passed to the custom task.  The custom task's results can be used by other Pipeline tasks and by the Pipeline results.

docs/pipelines.md

@@ -25,6 +25,7 @@ weight: 3
   - [Configuring the `Task` execution order](#configuring-the-task-execution-order)
   - [Adding a description](#adding-a-description)
   - [Adding `Finally` to the `Pipeline`](#adding-finally-to-the-pipeline)
+  - [Using Custom Tasks](#using-custom-tasks)
   - [Code examples](#code-examples)
 
 ## Overview
@@ -885,6 +886,87 @@ In this example, `PipelineResults` is set to:
 ],
 ```
 
+## Using Custom Tasks
+
+[Custom Tasks](https://github.com/tektoncd/community/blob/master/teps/0002-custom-tasks.md)
+can implement behavior that doesn't correspond directly to running a workload in a `Pod` on the cluster.
+For example, a custom task might execute some operation outside of the cluster and wait for its execution to complete.
+
+A PipelineRun starts a custom task by creating a [`Run`](https://github.com/tektoncd/pipeline/blob/master/docs/runs.md) instead of a `TaskRun`.
+In order for a custom task to execute, there must be a custom task controller running on the cluster
+that is responsible for watching and updating `Run`s which reference their type. 
+If no such controller is running, those `Run`s will never complete and Pipelines using them will time out.
+
+Custom tasks are an **_experimental alpha feature_** and should be expected to change
+in breaking ways or even be removed.
+
+### Specifying the target Custom Task
+
+To specify the custom task type you want to execute, the `taskRef` field
+must include the custom task's `apiVersion` and `kind` as shown below:
+
+```yaml
+spec:
+  tasks:
+    - name: run-custom-task
+      taskRef:
+        apiVersion: example.dev/v1alpha1
+        kind: Example
+```
+
+This creates a `Run` of a custom task of type `Example` in the `example.dev` API group with the version `v1alpha1`.
+
+You can also specify the `name` of a custom task resource object previously defined in the cluster.
+
+```yaml
+spec:
+  tasks:
+    - name: run-custom-task
+      taskRef:
+        apiVersion: example.dev/v1alpha1
+        kind: Example
+        name: myexample
+```
+
+If the `taskRef` specifies a name, the custom task controller should look up the
+`Example` resource with that name and use that object to configure the execution.
+
+If the `taskRef` does not specify a name, the custom task controller might support
+some default behavior for executing unnamed tasks.
+
+### Specifying `Parameters`
+
+If a custom task supports [`parameters`](tasks.md#parameters), you can use the
+`params` field to specify their values:
+
+```yaml
+spec:
+spec:
+  tasks:
+    - name: run-custom-task
+      taskRef:
+        apiVersion: example.dev/v1alpha1
+        kind: Example
+        name: myexample
+      params:
+      - name: foo
+        value: bah
+```
+
+### Using `Results`
+
+If the custom task produces results, you can reference them in a Pipeline using the normal syntax,
+`$(tasks.<task-name>.results.<result-name>)`.
+
+### Limitations
+
+Pipelines do not directly support passing the following items to custom tasks:
+* Pipeline Resources
+* Workspaces
+* Service account name
+* Pod templates
+
+
 ## Code examples
 
 For a better understanding of `Pipelines`, study [our code examples](https://github.com/tektoncd/pipeline/tree/master/examples).

docs/runs.md

@@ -35,10 +35,6 @@ will have no `.status` value and no further action will be taken.
 `Run`s are an **_experimental alpha feature_** and should be expected to change
 in breaking ways or even be removed.
 
-`Run`s are not currently integrated with Pipelines, and require a running
-third-party controller to actually perform any work. Without a third-party
-controller, `Run`s will just exist without a status indefinitely.
-
 ## Configuring a `Run`
 
 A `Run` definition supports the following fields:

go.sum

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@@ -1771,6 +1783,7 @@ gopkg.in/square/go-jose.v2 v2.2.2/go.mod h1:M9dMgbHiYLoDGQrXy7OpJDJWiKiU//h+vD76
 gopkg.in/src-d/go-billy.v4 v4.3.2/go.mod h1:nDjArDMp+XMs1aFAESLRjfGSgfvoYN0hDfzEk0GjC98=
 gopkg.in/src-d/go-git-fixtures.v3 v3.5.0/go.mod h1:dLBcvytrw/TYZsNTWCnkNF2DSIlzWYqTe3rJR56Ac7g=
 gopkg.in/src-d/go-git.v4 v4.13.1/go.mod h1:nx5NYcxdKxq5fpltdHnPa2Exj4Sx0EclMWZQbYDu2z8=
+gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkepLTh2hOroT7a+7czfdQ=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
 gopkg.in/warnings.v0 v0.1.1/go.mod h1:jksf8JmL6Qr/oQM2OXTHunEvvTAsrWBLb6OOjuVWRNI=
 gopkg.in/warnings.v0 v0.1.2/go.mod h1:jksf8JmL6Qr/oQM2OXTHunEvvTAsrWBLb6OOjuVWRNI=
@@ -1785,9 +1798,8 @@ gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.3.0 h1:clyUAQHOM3G0M3f5vQj7LuJrETvjVot3Z5el9nffUtU=
 gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v3 v3.0.0-20190709130402-674ba3eaed22/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gotest.tools v2.2.0+incompatible h1:VsBPFP1AI068pPrMxtb/S8Zkgf9xEmTLJjfM+P5UIEo=
 gotest.tools v2.2.0+incompatible/go.mod h1:DsYFclhRJ6vuDpmuTbkuFWG+y2sxOXAzmJt81HFBacw=
-gotest.tools/v3 v3.0.2 h1:kG1BFyqVHuQoVQiR1bWGnfz/fmHvvuiSPIV7rvl360E=
-gotest.tools/v3 v3.0.2/go.mod h1:3SzNCllyD9/Y+b5r9JIKQ474KzkZyqLqEfYqMsX94Bk=
 helm.sh/helm/v3 v3.1.1/go.mod h1:WYsFJuMASa/4XUqLyv54s0U/f3mlAaRErGmyy4z921g=
 honnef.co/go/tools v0.0.0-20180728063816-88497007e858/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=

hack/update-codegen.sh

@@ -58,6 +58,11 @@ ${PREFIX}/deepcopy-gen \
   --go-header-file ${REPO_ROOT_DIR}/hack/boilerplate/boilerplate.go.txt \
 -i github.com/tektoncd/pipeline/pkg/apis/resource/v1alpha1/storage
 
+${PREFIX}/deepcopy-gen \
+  -O zz_generated.deepcopy \
+  --go-header-file ${REPO_ROOT_DIR}/hack/boilerplate/boilerplate.go.txt \
+-i github.com/tektoncd/pipeline/pkg/apis/run/v1alpha1
+
 # Knative Injection
 # This generates the knative injection packages for the resource package (v1alpha1).
 # This is separate from the pipeline package for the same reason as client and all (see above).