Testing that convert.hg.preserve-hash=true can be used to make hg

convert from hg repo to hg repo preserve hashes, even if the

computation of the files list in commits change slightly between hg

versions.

  $ cat <<'EOF' >> "$HGRCPATH"

  > [extensions]

  > convert =

  > EOF

  $ cat <<'EOF' > changefileslist.py

  > from mercurial import (changelog, extensions, metadata)

  > def wrap(orig, clog, manifest, files, *args, **kwargs):

  >   files = metadata.ChangingFiles(touched=[b"a"])

  >   return orig(clog, manifest, files, *args, **kwargs)

  > def extsetup(ui):

  >   extensions.wrapfunction(changelog.changelog, 'add', wrap)

  > EOF

  $ hg init repo

  $ cd repo

  $ echo a > a; hg commit -qAm a

  $ echo b > a; hg commit -qAm b

  $ hg up -qr 0; echo c > c; hg commit -qAm c

  $ hg merge -qr 1

  $ hg commit -m_ --config extensions.x=../changefileslist.py

  $ hg log -r . -T '{node|short} {files|json}\n'

  c085bbe93d59 ["a"]

Now that we have a commit with a files list that's not what the

current hg version would create, check that convert either fixes it or

keeps it depending on config:

  $ hg convert -q . ../convert

  $ hg --cwd ../convert log -r tip -T '{node|short} {files|json}\n'

  b7c4d4bbacd3 []

  $ rm -rf ../convert

  $ hg convert -q . ../convert --config convert.hg.preserve-hash=true

  $ hg --cwd ../convert log -r tip -T '{node|short} {files|json}\n'

  c085bbe93d59 ["a"]

  $ rm -rf ../convert