Commit 35616512 authored by Committed by bst-marge-bot
_cas/cascache.py: Add opt check_exists arg to _reachable_refs_dir()
By default the reachable set() includes all file digests from a given reachable directory/tree digest, however this does not guarantee the file objects are actually reachable. testutils/artifactshare.py has_artifact() ascertained if a given artifact is available by ensuring any 'reachable' digests are actually on the filesystem, this is made redudant with the optional check_exists objpath check during the reachable set creation.
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