gsutil rsync -c alternative for if mtime is changed, then check hash (repeated file upload issue.)

[kamarton]

Similar to the -c option, a parameter should be added that calculates CRC/MD5 hash in case of differences in mtime, and the file is only moved if there is a difference.

The situation is not clear, but identical files are being synchronized from a NAS server - I assume because there has been a change in the mtime value.

I currently use this:

gsutil -m rsync -r -d "/sourcedir" gs://destination-bucket/

And i see this in google cloud console web interface:

This situation is not constant, but there are files that have been uploaded multiple times, even though it is the same file being synchronized upwards.

Expected

Adding a new parameter that performs a content hash/crc check when the size is the same, but the mtime value is different.