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#!/usr/bin/env bash
function usage {
echo "usage: nixpkgs-pin <hash>"
echo "where <hash> is a git sha from the nixpkgs repo"
exit 1
}
[[ -z $1 ]] && usage
url="https://github.com/NixOS/nixpkgs/archive/$1.tar.gz"
hash=$(nix-prefetch-url --unpack $url)
cat <<EOF
# generated with ~/bin/nixpkgs-pin
{
url = "$url";
sha256 = "$hash";
}
EOF
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