Mercurial v0.9 released!

Matt Mackall mpm at
Wed May 10 17:17:49 CDT 2006

Version 0.9 of the Mercurial SCM is now available at:

More information available at:

Many thanks to the numerous developers, testers, and users who
contributed to this release. Enjoy!

Major changes between Mercurial 0.8.1 and 0.9:

 - The repository file format has been improved.
   - This has resulted in an average 40% reduction in disk space    usage.
   - The new format (called RevlogNG) is now the default.
   - Mercurial works perfectly with both the old and new repository
     file formats. It can transfer changes transparently between
     repositories of either format.
   - To use the new repository format, simply use `hg clone --pull` to
     clone an existing repository.
   - Note: Versions 0.8.1 and earlier of Mercurial cannot read
     RevlogNG repositories directly, but they can `clone`, `pull`
     from, and `push` to servers that are serving RevlogNG
 - Memory usage has been improved by over 50% for many common operations.
 - Substantial performance improvements on large repositories.
 - New commands:
   - 'archive' - generate a directory tree snapshot, tarball, or zip
     file of a revision
 - Deprecated commands:
   - 'addremove' - replaced by 'add' and 'remove --after'
   - 'forget' - replaced by 'revert'
   - 'undo' - replaced by 'rollback'
 - New extensions:
   - Bugzilla integration hook
   - Email notification hook
 - Nested repositories are now supported. Mercurial will not recurse
   into a subdirectory that contains a '.hg' directory. It is treated
   as a separate repository.
 - The standalone web server, 'hg serve', is now threaded, so it can
   talk to multiple clients at a time.
 - The web server can now display a "message of the day".
 - Support added for hooks written in Python.
 - Many improvements and clarifications to built-in help.

Mathematics is the supreme nostalgia of our time.

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