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rust-revlog: fix incorrect results with NULL_NODE prefixes In case a short hash is a prefix of `NULL_NODE`, the correct revision number lookup is `NULL_REVISION` only if there is no match in the nodemap. Indeed, if there is a single nodemap match, then it is an ambiguity with the always matching `NULL_NODE`. Before this change, using the Mercurial development repository as a testbed (it has public changesets with node ID starting with `0005` and `0009`), this is what `rhg` did (plain `hg` provided for reference) ``` $ rust/target/debug/rhg cat -r 000 README README: no such file in rev 000000000000 $ hg cat -r 000 README abort: ambiguous revision identifier: 000 ``` Here is the expected output for `rhg` on ambiguous prefixes (again, before this change): ``` $ rust/target/debug/rhg cat -r 0001 README abort: ambiguous revision identifier: 0001 ``` The test provided by 8c29af0f6d6e in `test-rhg.t` could become flaky with this change, unless all hashes are fixed. We expect reviewers to be more sure about that than we are.
author Georges Racinet <georges.racinet@octobus.net>
date Thu, 30 Mar 2023 11:34:30 +0200
parents a492610a2fc1
children
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Augie Fackler <augie@google.com>
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1 Our full contribution guidelines are in our wiki, please see:
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2
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3 https://www.mercurial-scm.org/wiki/ContributingChanges
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4
a492610a2fc1 contributing: add new file with a pointer to the wiki
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5 If you just want a checklist to follow, you can go straight to
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6
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7 https://www.mercurial-scm.org/wiki/ContributingChanges#Submission_checklist
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8
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9 If you can't run the entire testsuite for some reason (it can be
a492610a2fc1 contributing: add new file with a pointer to the wiki
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10 difficult on Windows), please at least run `contrib/check-code.py` on
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11 any files you've modified and run `python contrib/check-commit` on any
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12 commits you've made (for example, `python contrib/check-commit
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13 273ce12ad8f1` will report some style violations on a very old commit).