hclmergetool

README

About hclmergetool

Works with HashiCorp Configuration Language (HCL) files. Allows you to supplement the input file with blocks and attributes from the template file. You can use any file name (file extension doesn't matter) for the input and template files. The only thing required is valid HCL syntax.

Installation

Binary Release

Latest releases are available here on Github -> Releases . hclmergetool is a single binary, installation is as simple as placing the binary in your PATH.

Install with Go

go install github.com/max-fedorov/hclmergetool@latest

Update version with Go

go get -u github.com/max-fedorov/hclmergetool@latest

Usage

hclmergetool -i [FILE] -t [FILE]

Arguments:

-i  --input         path to HCL input file
-t  --template      path to HCL template file
-o  --output        path to HCL output file. If not specified, print to stdout

-u  --update-args   if set, the values for existing arguments will be updated from
                    the template values, otherwise, the default value remains
              
-v  --version       show version
-h  --help          print help information

Example

hclmergetool --update-args -i current.tf -t current_templ.tf -o current_override.tf

• current.tf

resource "aws_subnet" "public-1" {
    var_a = asd
    var_b = old_value
    old_block {
        var_block_a = qwe
    }
}

resource "aws_subnet" "public-2" {
    var_a = asd
    var_b = old_value
    old_block {
        var_block_a = qwe
    }
    new_block {

    }
}

resource "aws_subnet" "public-3" {
    var_a = asd
    var_b = old_value
    var_c = qwe
}

resource "aws_subnet_local" "public-4" {
}

• current_templ.tf

resource "aws_subnet" {
    var_a = asd
    var_b = new_value
    var_c = qwe_new

    old_block {
        var_block_a = qwe
        var_block_b = qwe_new
    }

    new_block {
        var_block_c = qwe
    }
}

• current_override.tf

resource "aws_subnet" "public-1" {
    var_a = asd
    var_b = new_value
    old_block {
        var_block_a = qwe
        var_block_b = qwe_new
    }

    new_block {
        var_block_c = qwe
    }
    var_c = qwe_new
}

resource "aws_subnet" "public-2" {
    var_a = asd
    var_b = new_value
    old_block {
        var_block_a = qwe
        var_block_b = qwe_new
    }
    new_block {

        var_block_c = qwe
    }
    var_c = qwe_new
}

resource "aws_subnet" "public-3" {
    var_a = asd
    var_b = new_value
    var_c = qwe_new

    old_block {
        var_block_a = qwe
        var_block_b = qwe_new
    }

    new_block {
        var_block_c = qwe
    }
}

resource "aws_subnet_local" "public-4" {
}