tvl-depot/tools/depot-nixpkgs-update.nix

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{ pkgs, depot, ... }:
let
inherit (depot.nix)
getBins
;
stableRelease = "21.05";
channelsUrl = "https://channels.nixos.org";
archiveUrl = "https://github.com/NixOS/nixpkgs/archive/";
bins = getBins pkgs.nix [ "nix-prefetch-url" ]
// getBins pkgs.curl [ "curl" ]
;
in
pkgs.writers.writeDashBin "depot-nixpkgs-update" ''
set -e
printSet() {
setname="$1"
shift
channel="$1"
shift
commit="$(${bins.curl} -L "${channelsUrl}/$channel/git-revision")"
date="$(curl -i -L "${channelsUrl}/$channel/git-revision" \
| grep ^last-modified \
| sed 's/^last-modified: \(.\+\)\r/\1/')"
hash="$(${bins.nix-prefetch-url} --unpack --type sha256 "${archiveUrl}/$commit.tar.gz")"
printf '%s\n' "
# Tracking $channel as of $(date --rfc-3339=date --date="$date").
$setname = {
commit = \"$commit\";
sha256 = \"$hash\";
};"
}
printSet unstableHashes nixos-unstable
printSet stableHashes nixos-${stableRelease}
''