Crash when lauching packer build only with 0.7.2

[jothoma1]

Hello
i'm trying to use packer with XCP-NG (already use it with VMware)
When i try a simple packer build i have a crash :
panic: ConfigSpec failed: gob: type cty.Type has no exported fields [recovered] panic: ConfigSpec failed: gob: type cty.Type has no exported fields

I have tried on a Windows machine with packer 1.8.4 and on linux with the latest packer release and it's the same
Don't know where to start, anyone can help ?
thanks

[mtcoffee]

@jothoma1 after you pointed out in mtcoffee/xcp-ng-packer-examples#1 that it still happens in the latest release, I looked further. The issue is related to the v0.7.2 release dropped yesterday. It looks like @ddelnano and team have been working to improve!

In my case I noticed if the packer file is set to use version = "= v0.7.1" the error is not thrown.

[jothoma1]

Thanks @mtcoffee you are right the problem is only present with 0.7.2 it works with 0.7.1

[ceejatec]

This is caused by hashicorp/packer-plugin-sdk#187 . The story is complicated, it seems, but the workaround/fix until the Packer team can sort themselves out is for @ddelnano to run packer-sdc fix . in the source directory - this adds a line

replace github.com/zclconf/go-cty => github.com/nywilken/go-cty v1.13.3 // added by packer-sdc fix as noted in github.com/hashicorp/packer-plugin-sdk/issues/187

to go.mod. I've rebuilt packer-builder-xenserver locally with that change and copied it to ~/.config/packer/plugins/github.com/ddelnano/xenserver/packer-plugin-xenserver_v0.7.2_x5.0_linux_amd64, and things are working again.

[ddelnano]

Thanks for reporting this, pointing out the upstream issue and identifying the short term solution! #141 addresses this and I'll create a 7.3 release once that is merged.