Comparison of two Knative Builds - "build-default.yml" is a no-template build with explicit steps; "buildpack.yml" uses the pre-installed https://raw.githubusercontent.com/knative/build-templates/master/buildpack/buildpack.yaml build-template

build-default.yaml

apiVersion: build.knative.dev/v1alpha1
kind: Build
metadata:
  creationTimestamp: 2018-11-11T23:25:45Z
  generateName: simple-app-
  generation: 1
  name: simple-app-7s8pf
  namespace: default
  resourceVersion: "14435"
  selfLink: /apis/build.knative.dev/v1alpha1/namespaces/default/builds/simple-app-7s8pf
  uid: 1d852790-e609-11e8-8c37-42010a8a00af
spec:
  generation: 1
  serviceAccountName: build
  source:
    custom:
      args:
      - -c
      - touch /tmp/SOURCE_UPLOAD_DONE; while [ -f /tmp/SOURCE_UPLOAD_DONE ]; do sleep
        1; done
      command:
      - /bin/bash
      image: ubuntu:xenial
      name: ""
      resources: {}
  steps:
  - args:
    - --dockerfile=/workspace/Dockerfile
    - --destination=index.docker.io/drnic/knative-simple-app
    image: gcr.io/kaniko-project/executor
    name: build-and-push
    resources: {}
status:
  builder: Cluster
  cluster:
    namespace: default
    podName: simple-app-7s8pf-5jmhv
  completionTime: 2018-11-11T23:29:28Z
  conditions:
  - state: Succeeded
    status: "True"
  startTime: 2018-11-11T23:25:46Z
  stepStates:
  - terminated:
      containerID: docker://e8469ea2482d304d05e010162c85da7570ed1d4b53a4a77d36e8de6266e7df15
      exitCode: 0
      finishedAt: 2018-11-11T23:27:09Z
      reason: Completed
      startedAt: 2018-11-11T23:27:09Z
  - terminated:
      containerID: docker://ddc93c7d36d06c020d032094b6a945180deab58e42a1da6ed035b0bc2fade72b
      exitCode: 0
      finishedAt: 2018-11-11T23:27:25Z
      reason: Completed
      startedAt: 2018-11-11T23:27:17Z
  - terminated:
      containerID: docker://c6051e95b2eaf65d74011756ef792553b86f401d3517714b59172f372e17ca48
      exitCode: 0
      finishedAt: 2018-11-11T23:29:26Z
      reason: Completed
      startedAt: 2018-11-11T23:27:28Z

buildpack.yaml

apiVersion: build.knative.dev/v1alpha1
kind: Build
metadata:
  creationTimestamp: 2018-11-11T23:44:57Z
  generateName: simple-app-
  generation: 1
  name: simple-app-hq2qb
  namespace: default
  resourceVersion: "35351"
  selfLink: /apis/build.knative.dev/v1alpha1/namespaces/default/builds/simple-app-hq2qb
  uid: cc2ee5e3-e60b-11e8-8c37-42010a8a00af
spec:
  generation: 1
  serviceAccountName: build
  source:
    custom:
      args:
      - -c
      - touch /tmp/SOURCE_UPLOAD_DONE; while [ -f /tmp/SOURCE_UPLOAD_DONE ]; do sleep
        1; done
      command:
      - /bin/bash
      image: ubuntu:xenial
      name: ""
      resources: {}
  template:
    arguments:
    - name: IMAGE
      value: index.docker.io/drnic/knative-simple-app
    env:
    - name: GOPACKAGENAME
      value: main
    name: buildpack
status:
  builder: Cluster
  cluster:
    namespace: default
    podName: simple-app-hq2qb-6zzdp
  completionTime: 2018-11-11T23:46:23Z
  conditions:
  - state: Succeeded
    status: "True"
  startTime: 2018-11-11T23:44:57Z
  stepStates:
  - terminated:
      containerID: docker://5607dcb59eb58d2c9adb6fac5754064f883c910229e72725b3ada52ea85b8515
      exitCode: 0
      finishedAt: 2018-11-11T23:44:59Z
      reason: Completed
      startedAt: 2018-11-11T23:44:59Z
  - terminated:
      containerID: docker://07ad27681b0d8a38a4cb9ba0bb27221f6eb840608dd1bc5d93a4a2951acc6161
      exitCode: 0
      finishedAt: 2018-11-11T23:45:06Z
      reason: Completed
      startedAt: 2018-11-11T23:45:00Z
  - terminated:
      containerID: docker://ccc8a964212e4354e8a5c7799902220788337943e7ee44357a19febacdcce947
      exitCode: 0
      finishedAt: 2018-11-11T23:46:11Z
      reason: Completed
      startedAt: 2018-11-11T23:45:41Z
  - terminated:
      containerID: docker://2c908adbcaa04c73c24d92fae936257b3aa295b23ac5d0359a6f05841258f50c
      exitCode: 0
      finishedAt: 2018-11-11T23:46:21Z
      reason: Completed
      startedAt: 2018-11-11T23:46:17Z