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Fetch only the commit graph of a fork's parent - #16
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The hygiene job fetched every branch of a fork's parent in full. For itpplasma/DESC (3.2 GB, 187 parent branches) this filled the runner disk (
No space left on device), so nothing could pass the fork's merge queue.The parent's refs are used only to exclude its commits from the checked range, which needs the commit graph alone. The step now fetches the parent with
--filter=tree:0and without automatic repacking. For DESC this adds about 10 MB in 9 s, andgit rev-list base..head --not --glob='refs/upstream/*'returns the same commits as with a full fetch (checked on the merge of upstreammasterinto the fork).The unit tests pass; the workflow step itself is exercised by the DESC fork once it pins this revision.
Chris&AI