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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-convert-bzr-114
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/ tests / test-convert-bzr-114
#!/bin/sh
"$TESTDIR/hghave" bzr114 || exit 80
. "$TESTDIR/bzr-definitions"
# The file/directory replacement can only be reproduced on
# bzr >= 1.4. Merge it back in test-convert-bzr-directories once
# this version becomes mainstream.
echo % replace file with dir
mkdir test-replace-file-with-dir
cd test-replace-file-with-dir
bzr init -q source
cd source
echo d > d
bzr add -q d
bzr commit -q -m 'add d file'
rm d
mkdir d
bzr add -q d
bzr commit -q -m 'replace with d dir'
echo a > d/a
bzr add -q d/a
bzr commit -q -m 'add d/a'
cd ..
hg convert source source-hg
manifest source-hg tip
cd source-hg
hg update
cd ../..