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Terraform Version

$ terraform -v
Terraform v1.5.6
on darwin_arm64
+ provider registry.terraform.io/hashicorp/google v4.80.0
+ provider registry.terraform.io/hashicorp/time v0.9.1

Affected Resource(s)

• google_storage_bucket_object_content

Terraform Configuration Files

terraform {
  required_providers {
    google = {
      source  = "hashicorp/google"
      version = "4.80.0"
    }
    time = {
      source  = "hashicorp/time"
      version = "0.9.1"
    }
  }
}

resource "time_sleep" "foo" {
  create_duration = "1s"
}

data "google_storage_bucket_object_content" "landsat" {
  bucket     = "gcp-public-data-landsat"
  name       = "LC08/01/001/003/LC08_L1GT_001003_20171007_20171023_01_T2/LC08_L1GT_001003_20171007_20171023_01_T2_ANG.txt"
  depends_on = [time_sleep.foo]
}

output "output" {
  value = replace(data.google_storage_bucket_object_content.landsat.content, "END", "end")
}

Debug Output

Expected Behavior

terraform apply succeeds.

Actual Behavior

terraform apply failed with the following error.

Error: Invalid function argument

  on main.tf line 25, in output "output":
  25:   value = replace(data.google_storage_bucket_object_content.landsat.content, "END", "end")
    ├────────────────
    │ while calling replace(str, substr, replace)
    │ data.google_storage_bucket_object_content.landsat.content is null

Invalid value for "str" parameter: argument must not be null.

Removing the depends_on attribute resolves the error.

Steps to Reproduce

1. terraform apply

Important Factoids

References

similar reports

• Unexpected behaviour with google_storage_bucket_object. Cannot access content of the file even though it shows up in state and output #14666

root causes

The document says content is a computed attribute, but the implementation appears to disagree.
I suspect this is the root cause of this problem.

(The document also says it is "Content-Language of the object content", but this also appears to be wrong.)