[Bug 5506] New: bundle -t zstd fails on long-lived repository

[mercurial-bugs at mercurial-scm.org]

https://bz.mercurial-scm.org/show_bug.cgi?id=5506

            Bug ID: 5506
           Summary: bundle -t zstd fails on long-lived repository
           Product: Mercurial
           Version: 4.1.1
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: bug
          Priority: wish
         Component: bundle2
          Assignee: bugzilla at mercurial-scm.org
          Reporter: foozy at lares.dti.ne.jp
                CC: mercurial-devel at mercurial-scm.org,
                    pierre-yves.david at ens-lyon.org

On long-lived repository (5.5 years or so, or one created with
usegeneraldelta=no, explicitly), "hg bundle --type zstd" fails
with error below.

    File "..../mercurial/bundle2.py", line 1320, in writebundle
      header, comp = bundletypes[bundletype]
  KeyError: 'HG10ZS'

If current repository doesn't have "generaldelta" in its
requirements, parsebundlespec() in exchange.py returns "v1" as
"appropriate bundle version".

This causes unknown bundle type name "HG10ZS" for "hg bundle
--type zstd".

This issue can be reproduced by steps below.

  $ hg --config format.usegeneraldelta=no init repo
  $ echo a > repo/a
  $ hg -R repo commit -Am '#0'
  $ hg -R repo bundle --all --type zstd bundle.zstd

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