provisioner/ansible-local: better error if missing [GH-836]

CHANGELOG.md

@@ -32,6 +32,8 @@ BUG FIXES:
 * post-processor/vagrant: AWS/DigitalOcean keep input artifacts by
   default. [GH-55]
 * provisioners/ansible-local: Properly upload custom playbooks. [GH-829]
+* provisioners/ansible-local: Better error if ansible isn't installed.
+  [GH-836]
 
 ## 0.5.1 (01/02/2014)
 

provisioner/ansible-local/provisioner.go

@@ -232,6 +232,12 @@ func (p *Provisioner) executeAnsible(ui packer.Ui, comm packer.Communicator) err
 		return err
 	}
 	if cmd.ExitStatus != 0 {
+		if cmd.ExitStatus == 127 {
+			return fmt.Errorf("%s could not be found. Verify that it is available on the\n" +
+				"PATH after connecting to the machine.",
+				p.config.Command)
+		}
+
 		return fmt.Errorf("Non-zero exit status: %d", cmd.ExitStatus)
 	}
 	return nil