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