builder/amazon/common: wait for AMI to be available [GH-207]

CHANGELOG.md

@@ -18,6 +18,8 @@ IMPROVEMENTS:
 
 BUG FIXES:
 
+* builder/amazon/all: Gracefully handle when AMI appears to not exist
+  while AWS state is propogating. [GH-207]
 * builder/virtualbox: Trim carriage returns for Windows to properly
   detect VM state on Windows. [GH-218]
 * core: build names no longer cause invalid config errors. [GH-197]

builder/amazon/common/ami.go

@@ -11,6 +11,11 @@ func WaitForAMI(c *ec2.EC2, imageId string) error {
 	for {
 		imageResp, err := c.Images([]string{imageId}, ec2.NewFilter())
 		if err != nil {
+			if ec2err, ok := err.(*ec2.Error); ok && ec2err.Code == "InvalidAMIID.NotFound" {
+				log.Println("AMI not found, probably state issues on AWS side. Trying again.")
+				continue
+			}
+
 			return err
 		}