[jira] (SCM-739) Use "git --depth 1" When Checking Out

["Ernst de Haan (JIRA)" <ji...@codehaus.org>]

Ernst de Haan created SCM-739:
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             Summary: Use "git --depth 1" When Checking Out
                 Key: SCM-739
                 URL: https://jira.codehaus.org/browse/SCM-739
             Project: Maven SCM
          Issue Type: Bug
          Components: maven-scm-provider-git
    Affects Versions: 1.8.1
            Reporter: Ernst de Haan


*Executive summary: Please use {{--depth 1}} when checking out from a git repository.*

Currently when doing {{mvn release:prepare release:perform}}, the git checkout step takes a significant amount of time.

During the git checkout it appears to not only check out the correct version of the code, but also _all_ history, as would be done with a regular: {code:none}git clone URL{code}

However, git supports checking out only the latest version of the code base, using this command: {code:none}git clone --depth 1 URL{code}

For the purpose of the Maven Release Plugin, that should be sufficient, as far as I can see.

Changing the plugin to use {{--depth 1}} will:
- _significantly_ improve performance on larger repositories and/or with a lot of history
- and reduce I/O on repositories with a lot of history.

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