revlog: break up compression of large deltas Python's zlib apparently makes an internal copy of strings passed to compress(). To avoid this, compress strings 1M at a time, then join them at the end if the result would be smaller than the original. For initial commits of large but compressible files, this cuts peak memory usage nearly in half.

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% should fail

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abort: path contains illegal component: .hg/00changelog.i

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adding a/a

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% should fail

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abort: path 'b/b' traverses symbolic link 'b'

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% should succeed

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% should still fail - maybe

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abort: path 'b/b' traverses symbolic link 'b'