Merge pull request #43 from jmccann/multi_backend_config

Multiple backend-config options

DOCS.md

@@ -54,19 +54,20 @@ pipeline:
 +   sensitive: true
 ```
 
-Example configuration with state tracked via remote:
+Example configuration with state tracked via remote.  You will need a
+[backend configuration](https://www.terraform.io/docs/backends/config.html)
+specified in a `.tf` file.  You can then pass additional options via the `.drone.yml`.
 
 ```diff
 pipeline:
   terraform:
     image: jmccann/drone-terraform:1
     plan: false
-+   remote:
++   init_options:
-+     backend: S3
++     backend-config:
-+     config:
++       - "bucket=my-terraform-config-bucket"
-+       bucket: my-terraform-config-bucket
++       - "key=tf-states/my-project"
-+       key: tf-states/my-project
++       - "region=us-east-1"
-+       region: us-east-1
 ```
 
 You may want to run terraform against internal resources, like an internal
@@ -145,12 +146,11 @@ pipeline:
   dev_terraform:
     image: jmccann/drone-terraform:1
     plan: false
-    remote:
+    init_options:
-      backend: S3
+      backend_config:
-      config:
+        - "bucket=my-terraform-config-bucket"
-        bucket: my-terraform-config-bucket
+        - "key=tf-states/my-project"
-        key: tf-states/my-project
+        - "region=us-east-1"
-        region: us-east-1
 +   secrets:
 +     AWS_ACCESS_KEY_ID: DEV_AWS_ACCESS_KEY_ID
 +     AWS_SECRET_ACCESS_KEY: DEV_AWS_SECRET_ACCESS_KEY
@@ -158,12 +158,11 @@ pipeline:
   prod_terraform:
     image: jmccann/drone-terraform:1
     plan: false
-    remote:
+    init_options:
-      backend: S3
+      backend_config:
-      config:
+        - "bucket=my-terraform-config-bucket"
-        bucket: my-terraform-config-bucket
+        - "key=tf-states/my-project"
-        key: tf-states/my-project
+        - "region=us-east-1"
-        region: us-east-1
 +   secrets:
 +     AWS_ACCESS_KEY_ID: PROD_AWS_ACCESS_KEY_ID
 +     AWS_SECRET_ACCESS_KEY: PROD_AWS_SECRET_ACCESS_KEY
@@ -174,15 +173,19 @@ pipeline:
 plan
 : if true, calculates a plan but does __NOT__ apply it.
 
-remote
+init_options
-: contains the configuration for the Terraform remote state tracking.
+: contains the configuration for the Terraform backend.
 
-remote.backend
+init_options.backend-config
-: the Terraform remote state backend to use.
+: This specifies additional configuration to merge for the backend. This can be
+specified multiple times. Flags specified later in the line override those
+specified earlier if they conflict.
 
-remote.config
+init_options.lock
-: a map of configuration parameters for the remote state backend.
+: Lock the state file when locking is supported.
-Each value is passed as a `-backend-config=<key>=<value>` option.
+
+init_options.lock-timeout
+: Duration to retry a state lock.
 
 vars
 : a map of variables to pass to the Terraform `plan` and `apply` commands.

plugin.go

@@ -31,7 +31,7 @@ type (
 	}
 
 	InitOptions struct {
-		BackendConfig string `json:"backend-config"`
+		BackendConfig []string `json:"backend-config"`
 		Lock          *bool    `json:"lock"`
 		LockTimeout   string   `json:"lock-timeout"`
 	}
@@ -122,8 +122,8 @@ func initCommand(config InitOptions) *exec.Cmd {
 		"init",
 	}
 
-	if config.BackendConfig != "" {
+	for _, v := range config.BackendConfig {
-		args = append(args, fmt.Sprintf("-backend-config=%s", config.BackendConfig))
+		args = append(args, fmt.Sprintf("-backend-config=%s", v))
 	}
 
 	// True is default in TF