GCS Data Source

[logicbomb421]

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Description

It would be nice if a GCS data source existed that would allow one to download GCS objects during packer builds. These could then be referenced in file provisioners for upload to the build instance.

Use Case(s)

This would be useful when using non-GCP builders that need access to private data stored in a GCS bucket.

Potential configuration

data "googlestorage" "my_file" {
  bucket = "a-bucket"
  object = "path/to/a.file"
}

...

build {
  ...
  provisioner "file" {
    sources     = data.googlestorage.my_file.local_path
    destination = "/tmp/a.file"
  }
}

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If there isn't already an accepted solution for this, and there is also interest, I am happy to work on a PR for this feature.