branchcache: skip entries that are topological heads in the on disk file In the majority of cases, topological heads are also branch heads. We have efficient way to get the topological heads and efficient way to retrieve their branch information. So there is little value in putting them in the branch cache file explicitly. On the contrary, writing them explicitly tend to create very large cache file that are inefficient to read and update. So the branch cache v3 format is no longer including them. This changeset focus on the format aspect and have no focus on the performance aspect. We will cover that later.

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#testcases dirstate-v1 dirstate-v2

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#if dirstate-v2

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  $ cat >> $HGRCPATH << EOF

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  > [format]

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  > use-dirstate-v2=1

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  > [storage]

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  > dirstate-v2.slow-path=allow

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  > EOF

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#endif

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  $ rm -rf r

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  $ hg init r

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  $ cd r

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  $ mkdir d1

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  $ mkdir d2

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  $ touch d1/f d2/f

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  $ hg commit -Am '.'

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  adding d1/f

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  adding d2/f

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  $ echo 'syntax:re' >> .hgignore

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  $ echo '^d1$' >> .hgignore

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  $ hg commit -Am "ignore d1"

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  adding .hgignore

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Now d1 is a directory that's both committed and ignored.

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Untracked files in d2 are still shown, but ones in d1 are ignored:

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  $ touch d1/g

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  $ touch d2/g

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  $ RAYON_NUM_THREADS=1 hg status

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  ? d2/g