Summary
This set of scripts allows to work locally on Subversion-managed projects using the Mercurial distributed version control system.
Currenly two scripts are provided:
hgimportsvn initializes an SVN checkout which is also a Mercurial repository.
hgpullsvn pulls the latest changes from the SVN repository, and updates the Mercurial repository accordingly.
Example
Making a checkout of the Nose trunk:
$ mkdir nose && cd nose # Make SVN checkout, initialize hg repository with first SVN revision $ hgimportsvn http://python-nose.googlecode.com/svn/trunk $ cd trunk # Pull all history from SVN, creating a new hg changeset for each SVN rev $ hgpullsvn
Requirements
You first need to install the “pysvn” library (http://pysvn.tigris.org/). Unfortunately it is not available as an easy_install package, so it can’t be automated in the setup script. In Debian and Ubuntu this package is named “python-svn” (not “python-subversion” which is a different package). In Mandriva it is named “python-pysvn” (not “python-svn” which is a different package).
Features
Metadata
hgsvn reflects commit times (using the local timezone) and commit author names. Commit messages can contain Unicode characters.
Named branches
These scripts encourage the use of named branches. All updates using hgpullsvn are made in the branch named from the last component of the SVN URL (e.g., if the SVN URL is http://svn.myproj/branches/feature-ZZZ/, hgpullsvn will create and use the named branch ‘feature-ZZZ’).
You can thus do local development using one or several named branches, and hgpullsvn will update to the original (pristine) branch, leaving your local work intact (you can then merge by yourself if your want). This means that hg di -r name-of-pristine-branch will immediately give you a patch against the pristine branch, which you can submit to the project maintainers.
(Note: in a non-trivial setup where you work on several features or bugfixes, you will clone the pristine repository for each separate piece of work, which will still give you the benefit of named branches for quickly extracting diffs between branches).
Detecting parent repository
If the SVN URL has been created by copying from another SVN URL (this is the standard method for branch creation), hgimportsvn tries to find an hgsvn repository corresponding to the parent SVN URL. It then creates the new repository by cloning this repository at the revision immediately before the creation of the SVN branch.
In other words, let’s say you are operating from myworkdir/. In myworkdir/trunk, you already have an hgsvn repository synced from svn://server/myproj/trunk. You then hgimport svn://server/myproj/branches/new-feature. It will find that the ‘new-feature’ branch has been created by copying from ‘trunk’ at rev. 1138. It will thus created the ‘new-feature’ hg repository by cloning from the ‘trunk’ repository at the revision immediately preceding rev. 1138: for example rev. 1135, identified by the local tag ‘svn.1135’.
This means you will have an hgsvn repository containing two named branches: ‘trunk’ for all the changesets in the trunk before rev. 1138, and ‘new-feature’ for all the changesets in the SVN branch (therefore, after rev. 1138). This way, you can easily track how the branch diverges from the trunk, but also do merges, etc.
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