Mercurial > hg-stable
changeset 48574:5026a0d37526
filelog: add a comment explaining a fast path in filerevisioncopied()
Differential Revision: https://phab.mercurial-scm.org/D11964
| author | Simon Sapin <simon.sapin@octobus.net> |
|---|---|
| date | Thu, 06 Jan 2022 12:46:10 +0100 |
| parents | faa243f345cc |
| children | e91aa800ae5b |
| files | mercurial/utils/storageutil.py |
| diffstat | 1 files changed, 7 insertions(+), 0 deletions(-) [+] |
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--- a/mercurial/utils/storageutil.py Tue Dec 21 21:26:14 2021 +0100 +++ b/mercurial/utils/storageutil.py Thu Jan 06 12:46:10 2022 +0100 @@ -112,6 +112,13 @@ 2-tuple of the source filename and node. """ if store.parents(node)[0] != sha1nodeconstants.nullid: + # When creating a copy or move we set filelog parents to null, + # because contents are probably unrelated and making a delta + # would not be useful. + # Conversely, if filelog p1 is non-null we know + # there is no copy metadata. + # In the presence of merges, this reasoning becomes invalid + # if we reorder parents. See tests/test-issue6528.t. return False meta = parsemeta(store.revision(node))[0]