43 lines
1.0 KiB
Nix
43 lines
1.0 KiB
Nix
{ curl
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, jq
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, writeShellScriptBin
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, nix
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}:
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# Utility script for pinning the latest unstable version of Nixpkgs.
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# Instead of pinning Nixpkgs based on the huge Git repository, we reference a
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# specific tarball that only contains the source of the revision that we want
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# to pin.
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let
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name =
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"nixpkgs-upgrade";
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refUrl =
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https://api.github.com/repos/nixos/nixpkgs/git/ref/heads/nixpkgs-unstable;
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githubV3Header =
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"Accept: application/vnd.github.v3+json";
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tarballUrlBase =
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https://github.com/nixos/nixpkgs/archive/;
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in
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writeShellScriptBin
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name
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''
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set -euo pipefail
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commitHash="$(${curl}/bin/curl "${refUrl}" -H "${githubV3Header}" | ${jq}/bin/jq -r .object.sha)"
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tarballUrl="${tarballUrlBase}$commitHash.tar.gz"
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tarballHash="$(${nix}/bin/nix-prefetch-url --unpack "$tarballUrl")"
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currentDate="$(date --iso)"
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cat << EOF
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# Pinned version of Nixpkgs, generated with ${name}.
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{
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date = "$currentDate";
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rev = "$commitHash";
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tarballHash = "$tarballHash";
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}
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EOF
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''
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