add helper/update-flake.sh

This greatly simplifies updating nixpkgs.
See the comment at the top of update-flake.sh for a description.
This commit is contained in:
Erik Arvstedt 2021-08-16 10:42:08 +02:00
parent f7c2133250
commit 87df809a88
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2 changed files with 122 additions and 0 deletions

77
helper/update-flake.nix Normal file
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{ prevVersions ? null }:
let
flake = builtins.getFlake (toString ../.);
inherit (flake.inputs.nixpkgs) lib;
in rec {
# Convert the list of pinned pkgs to an attrset with form
# {
# stable = { bitcoind = "0.21.1"; ... };
# unstable = { btcpayserver = "1.2.1"; ... };
# }
# A pinned pkg is added to `stable` if the stable and unstable pkg versions
# are identical.
versions = let
pinned = flake.nbPkgs.x86_64-linux.pinned;
pinnedPkgs = lib.filterAttrs (n: v: lib.isDerivation v) pinned;
stable = pinned.pkgs;
unstable = pinned.pkgsUnstable;
isStable = builtins.partition (pkgName:
!(unstable ? "${pkgName}") ||
((stable ? "${pkgName}") && stable.${pkgName}.version == unstable.${pkgName}.version)
) (builtins.attrNames pinnedPkgs);
in {
stable = lib.genAttrs isStable.right (pkgName: stable.${pkgName}.version);
unstable = lib.genAttrs isStable.wrong (pkgName: unstable.${pkgName}.version);
};
showUpdates = let
prev = builtins.fromJSON prevVersions;
prevPkgs = prev.stable // prev.unstable;
mapFilter = f: xs: lib.remove null (map f xs);
mkChanges = title: pkgs:
let
lines = mapFilter (pkgName:
let
version = pkgs.${pkgName};
prevVersion = prevPkgs.${pkgName};
in
if version != prevVersion then
"${pkgName}: ${prevVersion} -> ${version}"
else
null
) (builtins.attrNames pkgs);
in
if lines == [] then
null
else
builtins.concatStringsSep "\n" ([title] ++ lines);
changes = [
(mkChanges "Pkg updates in nixpkgs stable:" versions.stable)
(mkChanges "Pkg updates in nixpkgs unstable:" versions.unstable)
];
allChanges = builtins.concatStringsSep "\n\n" (lib.remove null changes);
in
if allChanges == "" then
"No pkg version updates."
else
allChanges;
pinnedFile = let
toLines = pkgs: builtins.concatStringsSep "\n " (builtins.attrNames pkgs);
in ''
# This file is generated by ../helper/update-flake.nix
pkgs: pkgsUnstable:
{
inherit (pkgs)
${toLines versions.stable};
inherit (pkgsUnstable)
${toLines versions.unstable};
inherit pkgs pkgsUnstable;
}
'';
}

45
helper/update-flake.sh Executable file
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#!/usr/bin/env bash
set -euo pipefail
# This script does the following:
# - Update all flake inputs, including nixpkgs
# - Print version updates of pinned pkgs like so:
# Pkg updates in nixpkgs unstable:
# bitcoin: 0.20.0 -> 0.21.1
# btcpayserver: 1.1.0 -> 1.1.2
# - Write ../pkgs/pinned.nix:
# Packages for which the stable und unstable versions are identical are
# pinned to stable.
# All other pkgs are pinned to unstable.
# cd to script dir
cd "${BASH_SOURCE[0]%/*}"
if [[ $(nix flake 2>&1) != *"requires a sub-command"* ]]; then
echo "Error. This script requires nix flake support."
echo "https://nixos.wiki/wiki/Flakes#Installing_flakes"
exit 1
fi
if [[ ${1:-} != -f ]] && ! git diff --quiet ../flake.{nix,lock}; then
echo "error: flake.nix/flake.lock have changes. Run with option -f to ignore."
exit 1
fi
versions=$(nix eval --json -f update-flake.nix versions)
## Uncomment the following to generate a version change message for testing
# versions=$(echo "$versions" | sed 's|1|0|g')
nix flake update ..
echo
nix eval --raw -f update-flake.nix --argstr prevVersions "$versions" showUpdates; echo
pinned=../pkgs/pinned.nix
pinnedSrc=$(nix eval --raw -f update-flake.nix --argstr prevVersions "$versions" pinnedFile)
if [[ $pinnedSrc != $(cat "$pinned") ]]; then
echo "$pinnedSrc" > "$pinned"
echo
echo "Updated pinned.nix"
fi