Tom Pollard authored Nov 05, 2018 and Jürg Billeter committed Nov 17, 2018

_context.py: Add pull_buildtrees global user context, the default
of which is set to False via the addition of pull-buildtrees to
userconfig.yaml cache group.

_frontend/app.py & cli.py: Add --pull-buildtrees as a bst main
option, which when passed will override the default or user defined
context for pull_buildtrees.

tests/completions/completions.py: Update for the added flag.

Tom Pollard authored Nov 05, 2018 and Jürg Billeter committed Nov 17, 2018

The addition of cached build trees being included in element
artifacts has led to mostly redundant download overheads when
pulling from a remote artifact server. As such the default behaviour
of pull shouldn't fetch the build tree object if available.

element.py: extend relevant pull logic for specified subdir
consideration and ensure push logic does not lead to partial
artifact pushes. Change assumption that the buildtree can be
extracted if artifact is cached. __cached_buildtree() and
__pull_directories() helpers added.

_artifactcache/: artifactcache.py & cascache.py inclusion of
helper functions for subdir artifact checking & fetching, fetch
logic extended to only pull required artifact directories.
extract & checkout updated to handle full/partial operation.

tests/: addition of integration test pullbuildtrees.py,
buildtrees.py adapted cli options, testutils/artifactshare.py
has_artifact changed to return artifact digest on true condition.

Don't pull artifact buildtrees by default

See merge request !786