Unable to detect Erlang in local machine using wix installer

[Thang Vu]

My customer's requirements for this is to combine the installation files of Erlang and RabbitMQ with the MSI. file of my window application into one single package.

 

The main reason for this is because that my software requires RabbitMQ to run, so the customers want us to cut short the downloading steps.

We are including Erlang version 20.0 and RabbitMQ Server version 3.6.12 into the package.

 

My question is: How do RabbitMQ locate Erlang in local machines? Can I do it with Wix Installer? Any help would be really appreciated.

[Luke Bakken]

Hi Thang,

You probably want to include Erlang 20.1.

The RabbitMQ installer uses this registry key to determine if Erlang is installed:

https://github.com/rabbitmq/rabbitmq-server-release/blob/master/packaging/windows-exe/rabbitmq_nsi.in#L256

Let me know if that is the information you need.

Thanks,

Luke

[Thang Vu]

Hi Luke, 

Thanks for the reply. I did try with the registry key method, but it did not work as I expected since after I uninstall Erlang 20.0 and reboot, the registry key is still there. Is this a fix from a bug from Erlang 20.0 that has been included in Erlang 20.1?

[Michael Klishin]

We are not aware of Windows-specific fixes in 20.1. Are you installing and uninstalling as administrator?

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[Thang Vu]

I did, my steps are:

1. Remove RabbitMQ with administrator privilege
   
2. Check RabbitMQ registry key - it's gone
   
3. Remove Erlang 20.0 with administrator privilege
   
4. Reboot
   
5. Check Erlang registry key - it's still there.
   

This has been done on 2 different local machines. Both packages are installed with administrator privilege. 

What do you think, Michael? 

[Thang Vu]

Update: This is my code:

<util:RegistrySearch
      Root="HKLM"
      Key="SOFTWARE\Ericsson\Erlang\ErlSrv\1.1\RabbitMQ"
      Format="raw"
      Variable="RabbitMQRegistrySearchResult"
      Win64="yes"
      Result="exists"/>    

<util:RegistrySearch

      Root="HKLM"
      Key="SOFTWARE\Ericsson\Erlang"
      Format="raw"      

      Variable="ErlangHomePathSearchResult"
      Win64="yes"
      Result="exists"/>

[Luke Bakken]

Hi Thang,

You'll have to contact Ericsson about the Windows Erlang installer. It should remove the HKLM\SOFTWARE\Ericsson\Erlang registry key upon uninstallation.

I recommend checking for the key and then checking to see if the erl.exe file exists at the expected location.

Thanks,

Luke

[Thang Vu]

What's really weird here is that even if the registry key is still there, RabbitMQ still be able to find and validate that it's not.

 Anyway thanks for the help, I also contact the guy from Erlang support. Their reply was "There's not a simple solution.  The best approach is probably use the register to find the path to the executable and test if it’s there."

Regards,

Thang

[Thang Vu]

SOLVED: This has been solved here: https://stackoverflow.com/questions/47427130/wix-bundle-prerequisites-validation-erlang-and-rabbitmq

On Wednesday, November 29, 2017 at 4:54:11 PM UTC+7, Thang Vu wrote:

[Luke Bakken]

Thanks for letting the mailing list know. I am pretty surprised that the key is in that part of the registry.

[Thang Vu]

Me too. You're welcome! Glad to join the community!