How to print the gitinfo2 watermark vertically on the margin?

Question

I know that I can insert a watermark containing information about the git revision into my document using the gitinfo2 package like this:

\documentclass{article}

\usepackage{lipsum}
\usepackage[mark]{gitinfo2}
%You need to install gitinfo2 as described in the manual before compiling this

\begin{document}

\lipsum

\end{document}

How can I modify this that the git watermark occurs vertically on the left or on the right margin (similar to the watermark of arxiv papers).

Answer 1

\documentclass{article}

\usepackage{lipsum}
\usepackage{gitinfo2}% Don't pass mark option here
%You need to install gitinfo2 as described in the manual before compiling this

\usepackage{graphicx}

\makeatletter
\AddToShipoutPictureBG{%
    \AtPageLowerLeft{%
      \kern1cm
      \raisebox{\dimexpr.5\paperheight-.5\height}
        {\rotatebox{90}{\gitMarkFormat\gitMarkPref{} \textbullet{} \gitMark}}%
    }%
}%
\makeatother

\begin{document}

\lipsum

\end{document}

(Image is ready but upload failed due to some unspecified error at imgur; ok it works 10 hours later)

And with some customizing of \gitMarkFormat (in particular \small was not quite adapted to a vertical mark in left margin).

This is with

\renewcommand{\gitMarkFormat}{\color{blue}\Large\sffamily\bfseries}

added to preamble.