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xuxiongjian
76de060036
`tag or source.parent.parent.name` is empty whenever the graph is not two levels
below a named directory: `graphify global add /tmp/graph.json`, or any relative
path. Every node is then prefixed `::`, the prune key is `""`, and the manifest
entry cannot be removed because the `remove` subcommand reads an empty tag as a
missing argument.
Infer through `distinct_repo_tags`, the helper `merge-graphs` already uses, so the
two entry points cannot diverge again and the degrade is `"repo"`; absolutize
first so a relative path names the repo dir rather than the cwd placeholder. An
omitted `remove` tag stays a usage error, while an explicitly empty one is now
addressable so stores written by earlier revisions can be cleaned up.
(cherry picked from commit 6a317e6ef2)