gsutil cp reports OK but file never appears in the bucket

Seems like it depends if the cp command include './' for the src file

gsutil cp ./somefile gs://somebucket/somefile
Copying file://./somefile [Content-Type=application/octet-stream]...
/ [1 files][ 17.1 KiB/ 17.1 KiB]
Operation completed over 1 objects/17.1 KiB.

= Reported ok, but file not uploaded

gsutil cp somefile gs://somebucket/somefile
Copying file://somefile [Content-Type=application/octet-stream]...
/ [1 files][ 17.1 KiB/ 17.1 KiB]
Operation completed over 1 objects/17.1 KiB.

= Reported ok and file uploaded correctly

Start by reproducing the two gsutil cp commands from the issue against a test bucket, then compare the resulting bucket contents. No source file or test is named; done means the ./somefile form uploads the object successfully and regression coverage verifies both source-path forms.

Written by the indexing model from the issue text.