Merge pull request #3499 from dokku/3491-buildpacks-writing

Ensure the .buildpacks file exists before writing to it

plugins/buildpacks/src/triggers/post-extract/post-extract.go

@@ -26,7 +26,7 @@ func main() {
 	}
 
 	buildpacksPath := path.Join(tmpWorkDir, ".buildpacks")
-	file, err := os.OpenFile(buildpacksPath, os.O_RDWR|os.O_TRUNC, 0600)
+	file, err := os.OpenFile(buildpacksPath, os.O_RDWR|os.O_TRUNC|os.O_CREATE, 0600)
 	if err != nil {
 		common.LogFail(fmt.Sprintf("Error writing .buildpacks file: %s", err.Error()))
 		return

tests/unit/30_buildpacks.bats

@@ -209,3 +209,25 @@ teardown() {
   echo "status: $status"
   assert_output_not_exists
 }
+
+@test "(buildpacks) buildpacks deploy" {
+  destroy_app
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+
+  create_app
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+
+  run /bin/bash -c "dokku buildpacks:set $TEST_APP https://github.com/heroku/heroku-buildpack-nodejs"
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+
+  run deploy_app
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+}