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It's a small helper tool which I specifically use for running NixOS
tests (especially the installer ones) that require <nixpkgs> to be
copied to the store.
What git-detach does is creating a temporary working directory which
only contains a trimmed-down (without untracked files and .git
directory) version of the current Git repository.
So in case of <nixpkgs> this is especially useful to keep down the
closure size whenever the working dir is going to be exported to the
store.
Signed-off-by: aszlig <aszlig@redmoonstudios.org>
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