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abspath(path) converts path to an absolute path. Relative paths are resolved from the playbook’s working directory.

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Signature

abspath(path string) string

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Example

Ensure that a volume mount path in a Docker run command is always absolute, regardless of where errand is invoked from: 
variable "data_dir" {
  description = "Path to the data directory to mount"
  type        = string
  default     = "./data"
}

computed "data_abs" {
  description = "Absolute path to the data directory"
  expression  = abspath(var.data_dir)
}

task "run-db" {
  description = "Start the database with a local volume"
  commands    = ["docker run -v ${computed.data_abs}:/var/lib/postgresql/data postgres:16"]
}
./data becomes something like /home/user/project/data, which is required by docker run.

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Notes

  • abspath resolves the path relative to the effective working directory at evaluation time.
  • If path is already absolute, it is returned cleaned but otherwise unchanged.