Initial controller code.

This stands up a controller using ko. The controller does nothing
right now, other than register watchers on TaskRuns and log
reconciliation events.

.gitattributes

@@ -0,0 +1,7 @@
+# This file is documented at https://git-scm.com/docs/gitattributes.
+# Linguist-specific attributes are documented at
+# https://github.com/github/linguist.
+
+**/zz_generated.*.go linguist-generated=true
+/vendor/** linguist-generated=true
+

DEVELOPMENT.md

@@ -72,4 +72,35 @@ modules](https://github.com/golang/go/wiki/Modules#quick-start).
 
 ## Iterating
 
-Coming soon!
+## Install Chains
+
+You can stand up a version of this controller on-cluster (to your `kubectl
+config current-context`):
+
+```shell
+ko apply -f config/
+```
+
+### Redeploy controller
+
+As you make changes to the code, you can redeploy your controller with:
+
+```shell
+ko apply -f config/deployment.yaml
+```
+
+### Tear it down
+
+You can clean up everything with:
+
+```shell
+ko delete -f config/
+```
+
+## Accessing logs
+
+To look at the controller logs, run:
+
+```shell
+kubectl -n tekton-pipelines logs deployment/tekton-chains-controller
+```

cmd/controller/main.go

@@ -0,0 +1,71 @@
+/*
+Copyright 2020 The Tekton Authors
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+    http://www.apache.org/licenses/LICENSE-2.0
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package main
+
+import (
+	"context"
+	"flag"
+
+	taskruninformer "github.com/tektoncd/pipeline/pkg/client/injection/informers/pipeline/v1beta1/taskrun"
+	"github.com/tektoncd/pipeline/pkg/reconciler"
+	"go.uber.org/zap"
+	"k8s.io/client-go/tools/cache"
+	"knative.dev/pkg/configmap"
+	"knative.dev/pkg/controller"
+	"knative.dev/pkg/injection"
+	"knative.dev/pkg/injection/sharedmain"
+	"knative.dev/pkg/logging"
+	"knative.dev/pkg/signals"
+)
+
+var (
+	namespace = flag.String("namespace", "", "Namespace to restrict informer to. Optional, defaults to all namespaces.")
+)
+
+const (
+	controllerName = "chains"
+)
+
+func main() {
+	flag.Parse()
+
+	sharedmain.MainWithContext(injection.WithNamespaceScope(signals.NewContext(), *namespace), "watcher",
+		func(ctx context.Context, cmw configmap.Watcher) *controller.Impl {
+			// TODO: store and use the cmw
+			logger := logging.FromContext(ctx)
+			taskRunInformer := taskruninformer.Get(ctx)
+
+			c := &rec{
+				logger: logger,
+			}
+			impl := controller.NewImpl(c, c.logger, controllerName)
+
+			taskRunInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
+				AddFunc:    impl.Enqueue,
+				UpdateFunc: controller.PassNew(impl.Enqueue),
+			})
+
+			return impl
+		})
+}
+
+type rec struct {
+	*reconciler.Base
+	logger *zap.SugaredLogger
+}
+
+func (r *rec) Reconcile(ctx context.Context, key string) error {
+	r.logger.Infof("reconciling resource key: %s", key)
+	return nil
+}

config/100-deployment.yaml

@@ -0,0 +1,46 @@
+
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: tekton-chains-controller
+  namespace: tekton-pipelines
+  labels:
+    app.kubernetes.io/name: tekton-pipelines
+    app.kubernetes.io/component: chains
+    pipeline.tekton.dev/release: "devel"
+    version: "devel"
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: tekton-chains-controller
+  template:
+    metadata:
+      annotations:
+        cluster-autoscaler.kubernetes.io/safe-to-evict: "false"
+      labels:
+        app: tekton-chains-controller
+        app.kubernetes.io/name: tekton-pipelines
+        app.kubernetes.io/component: controller
+        # # tekton.dev/release value replaced with inputs.params.versionTag in pipeline/tekton/publish.yaml
+        # pipeline.tekton.dev/release: "devel"
+        version: "devel"
+    spec:
+      serviceAccountName: tekton-pipelines-controller
+      containers:
+      - name: tekton-chains-controller
+        image: ko://github.com/tektoncd/chains/cmd/controller
+        volumeMounts:
+        - name: config-logging
+          mountPath: /etc/config-logging
+        env:
+        - name: SYSTEM_NAMESPACE
+          valueFrom:
+            fieldRef:
+              fieldPath: metadata.namespace
+        - name: METRICS_DOMAIN
+          value: tekton.dev/chains
+      volumes:
+      - name: config-logging
+        configMap:
+          name: config-logging

go.mod

@@ -2,4 +2,29 @@ module github.com/tektoncd/chains
 
 go 1.14
 
-require github.com/tektoncd/plumbing v0.0.0-20200615101855-f56d60092af6
+require (
+	contrib.go.opencensus.io/exporter/ocagent v0.7.0 // indirect
+	contrib.go.opencensus.io/exporter/prometheus v0.2.0 // indirect
+	github.com/tektoncd/pipeline v0.13.2
+	github.com/tektoncd/plumbing v0.0.0-20200615101855-f56d60092af6
+	go.uber.org/zap v1.15.0
+	k8s.io/client-go v11.0.1-0.20190805182717-6502b5e7b1b5+incompatible
+	knative.dev/pkg v0.0.0-20200616145124-d289d2eef6cb
+)
+
+// Knative deps (release-0.15)
+replace (
+	contrib.go.opencensus.io/exporter/stackdriver => contrib.go.opencensus.io/exporter/stackdriver v0.12.9-0.20191108183826-59d068f8d8ff
+	github.com/Azure/azure-sdk-for-go => github.com/Azure/azure-sdk-for-go v38.2.0+incompatible
+	github.com/Azure/go-autorest => github.com/Azure/go-autorest v13.4.0+incompatible
+	knative.dev/caching => knative.dev/caching v0.0.0-20200521155757-e78d17bc250e
+	knative.dev/pkg => knative.dev/pkg v0.0.0-20200528142800-1c6815d7e4c9
+)
+
+// Pin k8s deps to 1.16.5
+replace (
+	k8s.io/api => k8s.io/api v0.16.5
+	k8s.io/apimachinery => k8s.io/apimachinery v0.16.5
+	k8s.io/client-go => k8s.io/client-go v0.16.5
+	k8s.io/code-generator => k8s.io/code-generator v0.16.5
+)