[git] git checkout tag, git pull fails in branch

@alesko : it is not possible to only do only git pull after checkout my_branch to update master branch only.
Because git pull will also merge to the current branch -> in your scenario to the my_branch

@Simon: that will do also the push. why is that?

$ git branch -u origin/master
Branch master set up to track remote branch master from origin.

and acording to docs:

-u <upstream>
  Set up <branchname>'s tracking information so <upstream> is considered  
  <branchname>'s upstream branch. If no <branchname> is specified,  
  then it defaults to the current branch.

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