nixpkgs/pkgs/development/beam-modules/hex-registry-snapshot.nix

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{stdenv, writeText, fetchFromGitHub }:
stdenv.mkDerivation rec {
name = "hex-registry";
rev = "11d7a24e9f53f52490ce255a6248e71128e73aa1";
version = "20180712.${rev}";
src = fetchFromGitHub {
inherit rev;
owner = "erlang-nix";
repo = "hex-pm-registry-snapshots";
sha256 = "0dbpcrdh6jqmvnm1ysmy7ixyc95vnbqmikyx5kk77qwgyd43fqgi";
};
installPhase = ''
mkdir -p "$out/var/hex"
zcat "registry.ets.gz" > "$out/var/hex/registry.ets"
'';
setupHook = writeText "setupHook.sh" ''
export HEX_REGISTRY_SNAPSHOT="$1/var/hex/registry.ets"
'';
meta = {
platforms = stdenv.lib.platforms.unix;
};
}