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  • Hash : 217c029b
    Author : Carlos Martín Nieto
    Date : 2014-04-09T14:08:22

    commit: safer commit creation with reference update
    
    The current version of the commit creation and amend function are unsafe
    to use when passing the update_ref parameter, as they do not check that
    the reference at the moment of update points to what the user expects.
    
    Make sure that we're moving history forward when we ask the library to
    update the reference for us by checking that the first parent of the new
    commit is the current value of the reference. We also make sure that the
    ref we're updating hasn't moved between the read and the write.
    
    Similarly, when amending a commit, make sure that the current tip of the
    branch is the commit we're amending.