Best way to truncate a string greater than a certain length

[Mark Snelling]

I'm hitting a possible limitation in Terraform interpolation where I'm attempting to truncate a string if it's longer than a certain number of characters. For example

variable name {

  default = "test"

}

resource "any_resource_type" "foo" {

  bar = ${length(var.name) > 15 ? substr(var.name, 0, 15) : var.name}

}

I keep getting the error "substr: 'offset + length' cannot be larger than the length of the string". It looks like the true part of the ternary is still getting evaluated even though the condition is false.

Am I doing something wrong or is there a better way to acheive this?

Thanks in advance,

Mark

[Lowe Schmidt]

Isn't just substringing without the condition nicer?

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Lowe Schmidt | +46 723 867 157

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[Mark Snelling]

No, substr() returns an error if the length parameter is greater than the actual string length.

On Thursday, 3 August 2017 17:34:27 UTC+1, Lowe Schmidt wrote:

Isn't just substringing without the condition nicer?

--

Lowe Schmidt | +46 723 867 157

On 3 August 2017 at 16:43, Mark Snelling <ma...@bakedbeans.com> wrote:

I'm hitting a possible limitation in Terraform interpolation where I'm attempting to truncate a string if it's longer than a certain number of characters. For example

variable name {

  default = "test"

}

resource "any_resource_type" "foo" {

  bar = ${length(var.name) > 15 ? substr(var.name, 0, 15) : var.name}

}

I keep getting the error "substr: 'offset + length' cannot be larger than the length of the string". It looks like the true part of the ternary is still getting evaluated even though the condition is false.

Am I doing something wrong or is there a better way to acheive this?

Thanks in advance,

Mark

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[Alexander Lehmann]

If terraform has a min function, you could do something like

bar = substr(var.name, 0, min(length(var.name, 15)))