added --dry-run

README.md

@@ -1,9 +1,6 @@
 # drone-s3-sync
 
 [![Build Status](http://beta.drone.io/api/badges/drone-plugins/drone-s3-sync/status.svg)](http://beta.drone.io/drone-plugins/drone-s3-sync)
-[![Go Doc](https://godoc.org/github.com/drone-plugins/drone-s3-sync?status.svg)](http://godoc.org/github.com/drone-plugins/drone-s3-sync)
-[![Go Report](https://goreportcard.com/badge/github.com/drone-plugins/drone-s3-sync)](https://goreportcard.com/report/github.com/drone-plugins/drone-s3-sync)
-[![Join the chat at https://gitter.im/drone/drone](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/drone/drone)
 
 Drone plugin to synchronize a directory with an Amazon S3 Bucket. For the
 usage information and a listing of the available options please take a look at

aws.go

@@ -108,8 +108,8 @@ func (a *AWS) Upload(local, remote string) error {
 		Bucket: aws.String(p.Bucket),
 		Key:    aws.String(remote),
 	})
-	if err != nil {
+	if err != nil && err.(awserr.Error).Code() != "404" {
-		if err.(awserr.Error).Code() != "404" {
+		if err.(awserr.Error).Code() == "404" {
 			return err
 		}
 
@@ -131,6 +131,11 @@ func (a *AWS) Upload(local, remote string) error {
 			putObject.ContentEncoding = aws.String(contentEncoding)
 		}
 
+		// skip upload during dry run
+		if a.plugin.DryRun {
+			return nil
+		}
+
 		_, err = a.client.PutObject(putObject)
 		return err
 	}
@@ -246,6 +251,11 @@ func (a *AWS) Upload(local, remote string) error {
 			copyObject.ContentEncoding = aws.String(contentEncoding)
 		}
 
+		// skip update if dry run
+		if a.plugin.DryRun {
+			return nil
+		}
+
 		_, err = a.client.CopyObject(copyObject)
 		return err
 	} else {
@@ -272,6 +282,11 @@ func (a *AWS) Upload(local, remote string) error {
 			putObject.ContentEncoding = aws.String(contentEncoding)
 		}
 
+		// skip upload if dry run
+		if a.plugin.DryRun {
+			return nil
+		}
+
 		_, err = a.client.PutObject(putObject)
 		return err
 	}
@@ -280,6 +295,11 @@ func (a *AWS) Upload(local, remote string) error {
 func (a *AWS) Redirect(path, location string) error {
 	p := a.plugin
 	debug("Adding redirect from \"%s\" to \"%s\"", path, location)
+
+	if a.plugin.DryRun {
+		return nil
+	}
+
 	_, err := a.client.PutObject(&s3.PutObjectInput{
 		Bucket: aws.String(p.Bucket),
 		Key:    aws.String(path),
@@ -292,6 +312,11 @@ func (a *AWS) Redirect(path, location string) error {
 func (a *AWS) Delete(remote string) error {
 	p := a.plugin
 	debug("Removing remote file \"%s\"", remote)
+
+	if a.plugin.DryRun {
+		return nil
+	}
+
 	_, err := a.client.DeleteObject(&s3.DeleteObjectInput{
 		Bucket: aws.String(p.Bucket),
 		Key:    aws.String(remote),

main.go

@@ -97,6 +97,11 @@ func main() {
 			Usage:  "id of cloudfront distribution to invalidate",
 			EnvVar: "PLUGIN_CLOUDFRONT_DISTRIBUTION",
 		},
+		cli.BoolFlag{
+			Name:   "dry-run",
+			Usage:  "dry run disables api calls",
+			EnvVar: "DRY_RUN,PLUGIN_DRY_RUN",
+		},
 		cli.StringFlag{
 			Name:  "env-file",
 			Usage: "source env file",
@@ -128,6 +133,7 @@ func run(c *cli.Context) error {
 		Metadata:               c.Generic("metadata").(*DeepStringMapFlag).Get(),
 		Redirects:              c.Generic("redirects").(*MapFlag).Get(),
 		CloudFrontDistribution: c.String("cloudfront-distribution"),
+		DryRun:                 c.Bool("dry-run"),
 	}
 
 	return plugin.Exec()

plugin.go

@@ -23,6 +23,7 @@ type Plugin struct {
 	Metadata               map[string]map[string]string
 	Redirects              map[string]string
 	CloudFrontDistribution string
+	DryRun                 bool
 	client                 AWS
 	jobs                   []job
 }