checking out a tag from a remote repository fails if the tag was not on the
current branch
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Key: SCM-502
URL: http://jira.codehaus.org/browse/SCM-502
Project: Maven SCM
Issue Type: Bug
Components: maven-scm-provider-git
Affects Versions: 1.2
Reporter: Mark Struberg
Calling scm:checkout for a tag often results in a merge failure.
This is caused by the fact that we do a git-pull prior to the checkout, but in
fact for tags, we only shall do a git-fetch.
This is due to the fact that the tag may be on a different branch, so merging
this branch into the current branch in the local repository would destroy the
local repository.
Instead we should first do a git-fetch [fetchUrl] followed by a git-checkout
tagname.
This will create a 'detached HEAD' in the local repo which is exactly the way
it should be in git.
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