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The fonts were always available in a repository format: https://code.google.com/p/googlefontdirectory/

There has been an AUR package for the fonts since 2013-04-27: https://aur.archlinux.org/packages/ttf-google-fonts-git

Why?

Git seems like a poor choice for publishing already compressed assets like fonts. Just include the font files you need in your offline applications.