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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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r7586:e9d3a11e default
r10189:e451e599 default
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test-audit-path.out
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% should fail
abort: path contains illegal component: .hg/00changelog.i
adding a/a
% should fail
abort: path 'b/b' traverses symbolic link 'b'
% should succeed
% should still fail - maybe
abort: path 'b/b' traverses symbolic link 'b'
% unbundle tampered bundle
adding changesets
adding manifests
adding file changes
added 5 changesets with 6 changes to 6 files (+4 heads)
(run 'hg heads' to see heads, 'hg merge' to merge)
% attack .hg/test
.hg/test
abort: path contains illegal component: .hg/test
% attack foo/.hg/test
foo/.hg/test
abort: path 'foo/.hg/test' is inside repo 'foo'
% attack back/test where back symlinks to ..
back
back/test
abort: path 'back/test' traverses symbolic link 'back'
% attack ../test
../test
abort: path contains illegal component: ../test
% attack /tmp/test
/tmp/test
abort: No such file or directory: [HGTMP]/test-audit-path/target//tmp/test