Use go.mod to control pack version (#250)

This will allow dependabot to managed the pack version for us, and also
decouples the build from the version of pack that happens to be
available on the workstation's path.

Resolves #46

Author: scothis

.github/workflows/ci.yaml

@@ -16,8 +16,6 @@ jobs:
     - uses: actions/setup-go@v1
       with:
         go-version: '1.13'
-    - name: Install pack
-      run: .github/workflows/install-pack.sh
     - name: Create Builder
       run: make build
     - name: Test Builder
@@ -37,8 +35,6 @@ jobs:
     - uses: actions/setup-go@v1
       with:
         go-version: '1.13'
-    - name: Install pack
-      run: .github/workflows/install-pack.sh
     - name: Create Builder
       run: make build
     - name: gcloud auth

.github/workflows/install-pack.sh

@@ -1,10 +1,12 @@
+PACK=go run github.com/buildpacks/pack/cmd/pack
+
 .PHONY: build build-dev test grab-run-image templates
 
 build: builder.toml
-	pack create-builder -b builder.toml projectriff/builder
+	$(PACK) create-builder -b builder.toml projectriff/builder
 
 build-dev: builder-dev.toml
-	pack create-builder -b builder-dev.toml projectriff/builder
+	$(PACK) create-builder -b builder-dev.toml projectriff/builder
 
 test: grab-run-image
 	GO111MODULE=on go test -v -tags=acceptance ./acceptance

Makefile

@@ -28,7 +28,7 @@ To build the `projectriff/builder` builder you'll need
 
 * Go 1.13+
 * a running local docker daemon
-* the https://github.com/buildpack/pack[`pack`] command line tool, https://github.com/buildpack/pack/releases[version] `>= 0.9.0`.
+* the https://github.com/buildpack/pack[`pack`] command line tool (for local function builds)
 
 === Creating the Builder
 Then, building the builder is as simple as

README.adoc

@@ -27,6 +27,7 @@ import (
 func TestBuilder(t *testing.T) {
 	tcs := &fntesting.Testcases{
 		Common: fntesting.Testcase{
+			PackCmd:     []string{"go", "run", "github.com/buildpacks/pack/cmd/pack"},
 			Repo:        "https://github.com/projectriff/fats",
 			Refspec:     "dc9e7758d15c669febee87d7f1801ce596348de1", // master as of 2019-09-19
 			Input:       "builder",

acceptance/acceptance_test.go

@@ -4,6 +4,7 @@
 package tools
 
 import (
+	_ "github.com/buildpacks/pack"
 	_ "github.com/cloudfoundry/build-system-cnb/buildsystem"
 	_ "github.com/cloudfoundry/node-engine-cnb/node"
 	_ "github.com/cloudfoundry/npm-cnb/npm"

ci/tools.go

@@ -3,9 +3,10 @@ module github.com/projectriff/builder
 go 1.13
 
 require (
+	github.com/buildpacks/pack v0.9.0
 	github.com/cloudfoundry/build-system-cnb v1.2.14
 	github.com/cloudfoundry/node-engine-cnb v0.0.160
 	github.com/cloudfoundry/npm-cnb v0.1.3
 	github.com/cloudfoundry/openjdk-cnb v1.2.14
-	github.com/projectriff/libfnbuildpack v0.4.0
+	github.com/projectriff/libfnbuildpack v0.4.1
 )