Cannot merge json template snippets

[Systemgeek-louis]

I broke apart my full json template into individual snippets: Metadata, Parameters, Mappings, Conditions, Resources, Outputs. Then tried to use rain to merge them.
rain merge --debug tm-standalone-2025.1-14v1.metadata.json tm-standalone-2025.1-14v1.parameters.json tm-standalone-2025.1-14v1.mappings.json tm-standalone-2025.1-14v1.conditions.json tm-standalone-2025.1-14v1.resources.json tm-standalone-2025.1-14v1.output.json --output tm-standalone-2025.1-14v1.MERGED.json

This resulted in an error:

panic: yaml: line 1936: did not find expected '-' indicator [recovered]
panic: yaml: line 1936: did not find expected '-' indicator

goroutine 1 [running]:
github.com/aws-cloudformation/rain/internal/cmd.execute.func1()
github.com/aws-cloudformation/rain/internal/cmd/wrap.go:77 +0x15e
panic({0x108333640?, 0xc0006278b0?})
runtime/panic.go:785 +0x132
github.com/aws-cloudformation/rain/internal/cmd/merge.init.func1(0xc0001ba500?, {0xc0001a46c0, 0x6, 0x1070a656d?})
github.com/aws-cloudformation/rain/internal/cmd/merge/merge.go:48 +0x2a5
github.com/spf13/cobra.(*Command).execute(0x10a0b3960, {0xc0001a4630, 0x9, 0x9})
github.com/spf13/[email protected]/command.go:989 +0xa91
github.com/spf13/cobra.(*Command).ExecuteC(0x10a0b0880)
github.com/spf13/[email protected]/command.go:1117 +0x3ff
github.com/spf13/cobra.(*Command).Execute(...)
github.com/spf13/[email protected]/command.go:1041
github.com/aws-cloudformation/rain/internal/cmd.execute(0xc000112060?)
github.com/aws-cloudformation/rain/internal/cmd/wrap.go:86 +0x4d
github.com/aws-cloudformation/rain/internal/cmd.Execute(0xc0000061c0?)
github.com/aws-cloudformation/rain/internal/cmd/wrap.go:95 +0x13
main.main()
github.com/aws-cloudformation/rain/cmd/rain/main.go:23 +0x1a

Does rain not support json template files?

[ericzbeard]

Rain does support json. Can you share the content of the files? Or a simplified set of files that reproduces the error?

[Systemgeek-louis]

I cannot share my CF Template at all. There are just way too many things company specific in there. What I am doing is very simple. I have a Full template with all the major sections in it like so: { "AWSTemplateFormatVersion": "2010-09-09", "Description": "SaaS Standalone Deployment (v2025.1-14 2025-1-14v1)", "Metadata": {}, "Parameters": {}, "Mappings": {}, "Conditions": {}, "Resources": {} } I then take the different sections as listed above like “Metadata”: {} and put that in one file called template-metadata.json. And I do the same thing with the other sections. I ignored the lines “AWSTempateFormatVersion”: and “Description”:. Then I ran rain merge and listed out all the individual files in the command. And got the error I sent in. My guess is that rain tried to do a validate on the files but since the files were only snippets of json not a full json file rain bombed out. As a side note I did happen to find this ruby gem called MKStack. It was able to take the same files, merge them into one output file. I tested that output buy building an instance in AWS with the template and it worked. So, whatever it is doing Rain should do. Let me know if you need more information. I will try to provide what I can for you. Louis From: Eric Z. Beard ***@***.***> Date: Thursday, January 30, 2025 at 17:00 To: aws-cloudformation/rain ***@***.***> Cc: Louis Bohm ***@***.***>, Author ***@***.***> Subject: Re: [aws-cloudformation/rain] Cannot merge json template snippets (Issue #635) Rain does support json. Can you share the content of the files? Or a simplified set of files that reproduces the error? — Reply to this email directly, view it on GitHub<#635 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/AAGOYCS36IMFXQVZYYTH53L2NKOJLAVCNFSM6AAAAABWDCWTDCVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDMMRVGY4DMOBTGA>. You are receiving this because you authored the thread.Message ID: ***@***.***>