Announcing git-cinnabar 0.3.1

> Git-cinnabar is a git remote helper to interact with mercurial
> repositories. It allows to clone, pull and push from/to mercurial remote
> repositories, using git.
> 
> Code on https://github.com/glandium/git-cinnabar
> 
> [ Previous announcements:
>   http://marc.info/?l=git&m=142837367709781
>   http://marc.info/?l=git&m=142364715001983
>   http://marc.info/?l=git&m=141781485726430 ]
> 
> Development had been stalled for a few months, with many improvements in
> the `next` branch without any new release. I used some time during the
> new year break and after in order to straighten things up in order to
> create a new release, delaying many of the originally planned changes to
> a future 0.4.0 release.
> 
> What's new since 0.2.2?
> 
> - Speed and memory usage were improved when doing `git push`.
> - Now works on Windows, at least to some extent. See details[1].
> - Support for pre-0.1.0 git-cinnabar repositories was removed. You must
>   first use a git-cinnabar version between 0.1.0 and 0.2.2 to upgrade
>   its metadata.
> - It is now possible to attach/graft git-cinnabar metadata to existing
>   commits matching mercurial changesets. This allows to migrate from
>   some other hg-to-git tool to git-cinnabar while preserving the
>   existing git commits.  See an example of how this works with the git
>   clone of the Gecko mercurial repository[2]
> - Avoid mercurial printing its progress bar, messing up with
>   git-cinnabar's output.
> - It is now possible to fetch from an incremental mercurial bundle
>   (without a root changeset).
> - It is now possible to push to a new mercurial repository without `-f`.
> - By default, reject pushing a new root to a mercurial repository.
> - Make the connection to a mercurial repository through ssh respect the
>   `GIT_SSH` and `GIT_SSH_COMMAND` environment variables.
> - `git cinnabar` now has a proper argument parser for all its
>   subcommands.
> - A new `git cinnabar python` command allows to run python scripts or
>   open a python shell with the right sys.path to import the cinnabar
>   module.
> - All git-cinnabar metadata is now kept under a single ref (although for
>   convenience, other refs are created, but they can be derived if
>   necessary).
> - Consequently, a new `git cinnabar rollback` command allows to roll
>   back to previous metadata states.
> - git-cinnabar metadata now tracks the manifests DAG.
> - A new `git cinnabar bundle` command allows to create mercurial
>   bundles, mostly for debugging purposes, without requiring to hit a
>   mercurial server.
> - Updated git to 2.7.0 for the native helper.
> 
> Development process changes
> 
> Up to before this release closing in, the `master` branch was dedicated
> to releases, and development was happening on the `next` branch, until a
> new release happens.
> 
> From now on, the `release` branch will take dot-release fixes and new
> releases, while the `master` branch will receive all changes that are
> validated through testing (currently semi-automatically tested with
> out-of-tree tests based on four real-life mercurial repositories, with
> some automated CI based on in-tree tests used in the future).
> 
> The `next` branch will receive changes to be tested in CI when things
> will be hooked up, and may have rewritten history as a consequence of
> wanting passing tests on every commit on `master`.
> 
> Mike
> 
> 1. https://github.com/glandium/git-cinnabar/wiki/Windows-Support
> 2. https://github.com/glandium/git-cinnabar/wiki/Mozilla:-Using-a-git-clone-of-gecko%E2%80%90dev-to-push-to-mercurial
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