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https://issues.apache.org/jira/browse/SCM-818?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16403821#comment-16403821
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Michael Osipov commented on SCM-818:
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Please see branch SCM-875 for a possible fix.
> Updating doesn't work when in detached HEAD
> -------------------------------------------
>
> Key: SCM-818
> URL: https://issues.apache.org/jira/browse/SCM-818
> Project: Maven SCM
> Issue Type: Bug
> Components: maven-scm-provider-gitexe
> Affects Versions: 1.9.4
> Reporter: Alexandre Garnier
> Priority: Major
>
> When calling {{scm:update}} in detached HEAD:
> {code}
> [INFO] Executing: /bin/sh -c cd '/path/to/project' && 'git' 'log' '-n1'
> '--date-order' 'master'
> [INFO] Working directory: /path/to/project
> [ERROR] Provider message:
> [ERROR] The git-log command failed.
> [ERROR] Command output:
> [ERROR] fatal: ambiguous argument 'master': unknown revision or path not in
> the working tree.
> {code}
> When no {{ScmVersion}} is given, the plugin defaults to {{master}}
> (https://github.com/apache/maven-scm/blob/master/maven-scm-providers/maven-scm-providers-git/maven-scm-provider-gitexe/src/main/java/org/apache/maven/scm/provider/git/gitexe/command/update/GitUpdateCommand.java#L169),
> defaulting to {{HEAD}} would be better, no ?
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