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justinclayton/hack.tf

Created May 1, 2018 19:02
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Terraform: conditionally reference a data source that may or may not exist
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hack.tf
variable "yes" { default = true }
data "template_file" "maybe" {
count = "${ var.yes == false ? 0 : 1 }"
template = "YES"
}
output "maybe" {
value = "${ var.yes == false ? "" : element(concat(data.template_file.maybe.*.rendered, list("")), 0) }" # <-- :_(
}
@Raghav2211
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Raghav2211 commented Dec 31, 2020 •
edited
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it'll fail because Terraform will evaluate all variable in ternary operation before use
So if var.yes = true then it'll generate error because data.template_file. maybe is not defined

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