fast-forward-2.tex

\documentclass[preview]{standalone}
\usepackage{gitdags}
\tikzgraphsset{%
  nudge/.style={/tikz/shift={#1}},
  nudge down/.style={nudge=(270:#1)},
  nudge down/.default=1
}

%\usepackage{fontspec}

%\setmainfont[ExternalLocation=/Users/othree/tmp-projects/git-graph/]{"EVA-Matisse_Standard.ttf"}

\begin{document}
    \centering
    \begin{tikzpicture}
      % Commit DAG
      \gitDAG[grow right sep = 2em]{
        0 -- 1 -- 2 -- 3 -- 4 -- {[nudge down] {A}}
      };
      \gitbranch
        {master}     % node name and text 
        {above=of A} % node placement
        {A}          % target
      \gitbranch
        {for-fast-forward}     % node name and text 
        {below=of A} % node placement
        {A}          % target
      \gitHEAD
        {above=of master} % node placement
        {master} 
      \end{tikzpicture}

\end{document}