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patch: support diff data loss detection and upgrade...
patch: support diff data loss detection and upgrade In worst case, generating diff in upgrade mode can be two times more expensive than generating it in git mode directly: we may have to regenerate the whole diff again whenever a git feature is detected. Also, the first diff attempt is completely buffered instead of being streamed. That said, even without having profiled it yet, I am convinced we can fast-path the upgrade mode if necessary were it to be used in regular diff commands, and not only in mq where avoiding data loss is worth the price.

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test-journal-exists.out
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/ tests / test-journal-exists.out
Matt Mackall
transactions: don't show a backtrace when journal exists...
r5865 adding a
Sune Foldager
change 'journal already exists' to 'abandoned transaction found'...
r9691 abort: abandoned transaction found - run hg recover!
Matt Mackall
transactions: don't show a backtrace when journal exists...
r5865 rolling back interrupted transaction
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
1 files, 1 changesets, 1 total revisions
Sune Foldager
transaction: always remove empty journal on abort...
r9693 % check that zero-size journals are correctly aborted
adding changesets
abort: Permission denied