Mercurial provider checkout should not default to tip
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Key: SCM-621
URL: http://jira.codehaus.org/browse/SCM-621
Project: Maven SCM
Issue Type: Bug
Components: maven-scm-provider-mercurial (hg)
Affects Versions: 1.5
Reporter: Kevin Calcagno
Priority: Critical
Attachments: hg-checkout-no-tip.patch
The checkout command for the Mercurial provider defaults to using "tip" as the
revision to clone if no explicit revision is specified, for example via the
scmVersion property when using the SCM plugin.
This poses a problem for repositories with branches because tip always points
to the most recent changeset in the repository regardless of branch. Thus
subsequent checkouts, even moments apart, using the same options could wind up
fetching completely different branches of code.
A better option is to simply not pass a revision to Hg if no scmVersion is
specified. This will cause Hg to resort to its default behavior: grab the
tip-most changeset from the default branch, or "tip" itself if the default
branch doesn't exist.
One potential downside of this solution is that it will result in cloning the
entire repository rather than just tip and its required ancestors. Predictable
behavior is worth the cost, however, and users with large repositories can work
around that limitation by explicitly making "default" their default value for
scmVersion. (Or "tip" if they want to preserve the current behavior.)
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