added ability to pass -var-file args to plan

DOCS.md

@@ -188,6 +188,10 @@ vars
 : a map of variables to pass to the Terraform `plan` and `apply` commands.
 Each value is passed as a `-var <key>=<value>` option.
 
+var_files
+: a list of variable files to pass to the Terraform `plan` and `apply` commands.
+Each value is passed as a `-var-file <value>` option.
+
 secrets
 : a map of variables to pass to the Terraform `plan` and `apply` commands as well as setting envvars.
 The `key` is the var and ENV to set.  The `value` is the ENV to read the value from.

main.go

@@ -79,6 +79,12 @@ func main() {
 			Usage:  "targets to run apply or plan on",
 			EnvVar: "PLUGIN_TARGETS",
 		},
+
+		cli.StringSliceFlag{
+			Name:   "var_files",
+			Usage:  "a list of var files to use. Each value is passed as -var-file=<value>",
+			EnvVar: "PLUGIN_VAR_FILES",
+		},
 	}
 
 	if err := app.Run(os.Args); err != nil {
@@ -123,6 +129,7 @@ func run(c *cli.Context) error {
 			RootDir:     c.String("root_dir"),
 			Parallelism: c.Int("parallelism"),
 			Targets:     c.StringSlice("targets"),
+			VarFiles:    c.StringSlice("var_files"),
 		},
 	}
 

plugin.go

@@ -2,16 +2,17 @@ package main
 
 import (
 	"fmt"
-	"github.com/Sirupsen/logrus"
-	"github.com/aws/aws-sdk-go/aws/credentials"
-	"github.com/aws/aws-sdk-go/aws/credentials/stscreds"
-	"github.com/aws/aws-sdk-go/aws/session"
-	"github.com/aws/aws-sdk-go/service/sts"
 	"io/ioutil"
 	"os"
 	"os/exec"
 	"strings"
 	"time"
+
+	"github.com/Sirupsen/logrus"
+	"github.com/aws/aws-sdk-go/aws/credentials"
+	"github.com/aws/aws-sdk-go/aws/credentials/stscreds"
+	"github.com/aws/aws-sdk-go/aws/session"
+	"github.com/aws/aws-sdk-go/service/sts"
 )
 
 type (
@@ -26,6 +27,7 @@ type (
 		RootDir     string
 		Parallelism int
 		Targets     []string
+		VarFiles    []string
 	}
 
 	Remote struct {
@@ -59,7 +61,7 @@ func (p Plugin) Exec() error {
 	}
 	commands = append(commands, getModules())
 	commands = append(commands, validateCommand())
-	commands = append(commands, planCommand(p.Config.Vars, p.Config.Secrets, p.Config.Parallelism, p.Config.Targets))
+	commands = append(commands, planCommand(p.Config.Vars, p.Config.Secrets, p.Config.Parallelism, p.Config.Targets, p.Config.VarFiles))
 	if !p.Config.Plan {
 		commands = append(commands, applyCommand(p.Config.Parallelism, p.Config.Targets))
 	}
@@ -146,7 +148,7 @@ func validateCommand() *exec.Cmd {
 	)
 }
 
-func planCommand(variables map[string]string, secrets map[string]string, parallelism int, targets []string) *exec.Cmd {
+func planCommand(variables map[string]string, secrets map[string]string, parallelism int, targets []string, varFiles []string) *exec.Cmd {
 	args := []string{
 		"plan",
 		"-out=plan.tfout",
@@ -154,6 +156,9 @@ func planCommand(variables map[string]string, secrets map[string]string, paralle
 	for _, v := range targets {
 		args = append(args, "--target", fmt.Sprintf("%s", v))
 	}
+	for _, v := range varFiles {
+		args = append(args, "-var-file", fmt.Sprintf("%s", v))
+	}
 	for k, v := range variables {
 		args = append(args, "-var")
 		args = append(args, fmt.Sprintf("%s=%s", k, v))