Tiago Gomes authored Aug 10, 2018 and Jürg Billeter committed Sep 30, 2018

We want to check if some file is already cached here, not the parent
directory.

Tiago Gomes authored Sep 13, 2018 and Jürg Billeter committed Sep 30, 2018

* Rename it to _commit_directory() because… it is what it does; and
  also for symmetry with _fetch_directory().
* Rename digest to dir_digest to make it clear this is a digest for a
  directory. A following commit will also reuse the same variable name
* Document method.

Tiago Gomes authored Sep 13, 2018 and Jürg Billeter committed Sep 30, 2018

* Rename tree to dir_digest to make it clear this is a Digest object,
  and not a Tree object.
* Add documentation

This adds directory objects to the local repository before downloading
files in the directory. However, artifact references are still stored
only after downloading the complete directory and thus, there won't be
dangling references. This will anyway be required for partial download
support.

gRPC can handle 1 MiB payloads. Increase size limit from 64 KiB to speed
up uploads.`

Use 1 MiB as payload size limit on the server side for both individual
downloads and batch uploads.

This uses BatchReadBlobs instead of individual blob download to speed up
artifact pulling, if the server supports it.

Fixes #554.

_artifactcache/cascache.py: Use BatchReadBlobs

See merge request !838