The MD5 of a GCS object, as GCS reports it (base64), or NA when it does not exist

One metadata read through gcloud storage objects describe; the value is what local_md5_base64() produces for the same bytes, so the pair says whether an upload would change anything. A composite object carries no md5Hash and reads as NA, which means "upload" — the safe side.

Usage

gcs_object_md5(gcs_uri)

local_md5_base64(path)

Arguments

gcs_uri

a gs://bucket/path

path

a local file

Value

a base64 MD5 string, or NA_character_

local_md5_base64(): the file's MD5 in the base64 form GCS uses.