From 7754458949341e2934f4fcd53b9fd68e612cef1f Mon Sep 17 00:00:00 2001
From: Loic PORTE <loicp@heetch.com>
Date: Wed, 15 Jan 2020 15:00:39 +0100
Subject: [PATCH] Add fail on change for terraform plan

---
 README.md | 21 ++-------------------
 go.mod    |  2 ++
 plugin.go | 14 ++++++++++----
 3 files changed, 14 insertions(+), 23 deletions(-)

diff --git a/README.md b/README.md
index 01ffed7..a6a237c 100644
--- a/README.md
+++ b/README.md
@@ -16,27 +16,10 @@ go test
 go build
 ```
 
-## Docker
-
-Build the docker image with the following commands:
-
-```
-docker build --rm=true \
-  -t jmccann/drone-terraform \
-  --build-arg terraform_version=0.12.0 .
-```
-
 ## Usage
 
 Execute from the working directory:
 
+```bash
+$ PLUGIN_ACTIONS=plan-fail-on-modification ./drone-terraform 
 ```
-docker run --rm \
-  -v $(pwd):$(pwd) \
-  -w $(pwd) \
-  jmccann/drone-terraform:latest --plan
-```
-
-## Drone 0.4
-
-Legacy `drone-terraform` plugin exists @ `jmccann/drone-terraform:0.4`
diff --git a/go.mod b/go.mod
index 516bad3..fe13ed4 100644
--- a/go.mod
+++ b/go.mod
@@ -10,3 +10,5 @@ require (
 	github.com/urfave/cli v0.0.0-20161006035353-55f715e28c46
 	golang.org/x/sys v0.0.0-20161006025142-8d1157a43547
 )
+
+go 1.13
diff --git a/plugin.go b/plugin.go
index 4afe66d..fa68422 100644
--- a/plugin.go
+++ b/plugin.go
@@ -115,15 +115,17 @@ func (p Plugin) Exec() error {
 		case "validate":
 			commands = append(commands, tfValidate())
 		case "plan":
-			commands = append(commands, tfPlan(p.Config, false))
+			commands = append(commands, tfPlan(p.Config, false, false))
 		case "plan-destroy":
-			commands = append(commands, tfPlan(p.Config, true))
+			commands = append(commands, tfPlan(p.Config, true, false))
+		case "plan-fail-on-modification":
+			commands = append(commands, tfPlan(p.Config, false, true))
 		case "apply":
 			commands = append(commands, tfApply(p.Config))
 		case "destroy":
 			commands = append(commands, tfDestroy(p.Config))
 		default:
-			return fmt.Errorf("valid actions are: fmt, validate, plan, apply, plan-destroy, destroy.  You provided %s", action)
+			return fmt.Errorf("valid actions are: fmt, validate, plan, apply, plan-destroy, plan-fail-on-modification destroy.  You provided %s", action)
 		}
 	}
 
@@ -293,7 +295,7 @@ func tfDestroy(config Config) *exec.Cmd {
 	)
 }
 
-func tfPlan(config Config, destroy bool) *exec.Cmd {
+func tfPlan(config Config, destroy bool, detailedExitCode bool) *exec.Cmd {
 	args := []string{
 		"plan",
 	}
@@ -304,6 +306,10 @@ func tfPlan(config Config, destroy bool) *exec.Cmd {
 		args = append(args, fmt.Sprintf("-out=%s", getTfoutPath()))
 	}
 
+	if detailedExitCode {
+		args = append(args, "-detailed-exitcode")
+	}
+
 	for _, v := range config.Targets {
 		args = append(args, "--target", fmt.Sprintf("%s", v))
 	}