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.

     1

  $ hg init repo

     2

  $ cd repo

     3

  $ touch unknown

     4

     5

  $ touch a

     6

  $ hg add a

     7

  $ hg ci -m "1"

     8

     9

  $ touch b

    10

  $ hg add b

    11

  $ hg ci -m "2"

    12

    13

Should show unknown

    14

    15

  $ hg status

    16

  ? unknown

    17

  $ hg revert -r 0 --all

    18

  removing b

    19

    20

Should show unknown and b removed

    21

    22

  $ hg status

    23

  R b

    24

  ? unknown

    25

    26

Should show a and unknown

    27

    28

  $ ls -A

    29

  .hg

    30

  a

    31

  unknown