Download one GLASS file with resume support — glass_download

Low-level httr2 wrapper. A HEAD size check is compared against the local file, partial downloads (.part) are continued with an HTTP Range request, and finished data are renamed into place so a crash never leaves a truncated file masquerading as complete.

Usage

glass_download_file(
  url,
  destfile,
  overwrite = FALSE,
  retries = 3,
  timeout_s = 300
)

Arguments

url: Direct file URL.
destfile: Final local path.
overwrite: If TRUE, a valid-looking local file is re-downloaded.
retries: Passed to httr2::req_retry.
timeout_s: Per-request timeout in seconds.

Value

One of "downloaded", "resumed", "resumed_partial", "skipped" or "failed"; for "failed" the error message is kept as attribute error.