evolve: handle relocation during divergence resolution producing no changes When resolving divergence and the two divergent commits have different parents, we start by rebasing one of them to have the same parent as the other. That step can result in no changes to commit. When it does, we would crash with a TypeError before this patch. This patch fixes it by instead creating an empty commit in that scenario. The existing code then continues to attempt to merge it, which produces no changes, and no commit is created on top. The other side of the divergence is marked as successor as usual, so orphans from the side that became empty will be evolved to the right place (see test).

     1

#require test-repo

     2

     3

  $ checkflake8() {

     4

  >   if ! (which flake8 > /dev/null); then

     5

  >     echo skipped: missing tool: flake8;

     6

  >     exit 80;

     7

  >   fi;

     8

  > };

     9

  $ checkflake8

    10

    11

Copied from Mercurial core (60ee2593a270)

    12

    13

  $ cd "`dirname "$TESTDIR"`"

    14

    15

run flake8 if it exists; if it doesn't, then just skip

    16

    17

  $ hg files -0 'set:(**.py or grep("^#!.*python")) - removed()' \

    18

  > -X hgext3rd/evolve/thirdparty \

    19

  > 2>/dev/null \

    20

  > | xargs -0 flake8