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The Git build step clones or updates a Git repository and checks out the specified branch or revision. Note that the buildbot supports Git version 1.2.0 and later: earlier versions (such as the one shipped in Ubuntu 'Dapper') do not support the git init command that the buildbot uses.

The Git step takes the following arguments:

(required): the URL of the upstream Git repository.
(optional): this specifies the name of the branch to use when a Build does not provide one of its own. If this this parameter is not specified, and the Build does not provide a branch, the “master” branch will be used.
(optional): when purging changes, don't use .gitignore and .git/info/exclude.
(optional): when initializing/updating a Git repository, this decides whether or not buildbot should consider git submodules. Default: False.
(optional): use the specified string as a path to a reference repository on the local machine. Git will try to grab objects from this path first instead of the main repository, if they exist.
(optional): instructs git to attempt shallow clones (--depth 1). If the user/scheduler asks for a specific revision, this parameter is ignored.
(optional): passes the (--progress) flag to (git fetch). This solves issues of long fetches being killed due to lack of output, but requires Git 1.7.2 or later.

This Source step integrates with GerritChangeSource, and will automatically use Gerrit's "virtual branch" (refs/changes/*) to download the additionnal changes introduced by a pending changeset.

Gerrit integration can be also triggered using forced build with gerrit_change property with value in format: change_number/patchset_number.