From 322dd2246f7328a4a5d12792241300b222abc9f2 Mon Sep 17 00:00:00 2001
From: Jose Diaz-Gonzalez <email@josediazgonzalez.com>
Date: Tue, 16 Apr 2019 22:02:24 -0400
Subject: [PATCH] fix: ensure the .buildpacks file exists before writing to it

---
 .../src/triggers/post-extract/post-extract.go |  2 +-
 tests/unit/30_buildpacks.bats                 | 22 +++++++++++++++++++
 2 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/plugins/buildpacks/src/triggers/post-extract/post-extract.go b/plugins/buildpacks/src/triggers/post-extract/post-extract.go
index 67ec7bf85..495a34855 100644
--- a/plugins/buildpacks/src/triggers/post-extract/post-extract.go
+++ b/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
diff --git a/tests/unit/30_buildpacks.bats b/tests/unit/30_buildpacks.bats
index 687da8f41..ae955ac69 100644
--- a/tests/unit/30_buildpacks.bats
+++ b/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
+}