Support —-buildpack flags on GCB (GoogleContainerTools#3606)

Signed-off-by: David Gageot <[email protected]>

Author: dgageot

pkg/skaffold/build/gcb/buildpacks.go

@@ -31,6 +31,10 @@ func (b *Builder) buildpackBuildSpec(artifact *latest.BuildpackArtifact, tag str
 		args = append(args, "--run-image", artifact.RunImage)
 	}
 
+	for _, buildpack := range artifact.Buildpacks {
+		args = append(args, "--buildpack", buildpack)
+	}
+
 	env, err := misc.EvaluateEnv(artifact.Env)
 	if err != nil {
 		return cloudbuild.Build{}, errors.Wrap(err, "unable to evaluate env variables")

pkg/skaffold/build/gcb/buildpacks_test.go

@@ -82,6 +82,20 @@ func TestBuildpackBuildSpec(t *testing.T) {
 			},
 			shouldErr: true,
 		},
+		{
+			description: "buildpacks list",
+			artifact: &latest.BuildpackArtifact{
+				Builder:    "builder",
+				Buildpacks: []string{"buildpack1", "buildpack2"},
+			},
+			expected: cloudbuild.Build{
+				Steps: []*cloudbuild.BuildStep{{
+					Name: "pack/image",
+					Args: []string{"pack", "build", "img", "--builder", "builder", "--buildpack", "buildpack1", "--buildpack", "buildpack2"},
+				}},
+				Images: []string{"img"},
+			},
+		},
 	}
 	for _, test := range tests {
 		testutil.Run(t, test.description, func(t *testutil.T) {