homepage-dashboard: improve cache directory patch (#463671)

    hash = "sha256-03am9z381UozNsmWZefopMp8/tLycXJyiZ5BUGaV1kY=";

  };

  # This patch ensures that the cache implementation respects the env

  # variable `NIXPKGS_HOMEPAGE_CACHE_DIR`, which is set by default in the

  # wrapper below.

  # The patch is automatically generated by the `update.sh` script.

  patches = [ ./prerender_cache_path.patch ];

  pnpmDeps = pnpm_10.fetchDeps {

    inherit (finalAttrs)

      pname

      version

      src

      patches

      ;

    fetcherVersion = 1;

    hash = "sha256-svkqmRFwZpcExFWtAbLL0lpHhzsI2s7RiLfQajIqjck=";

  env.PYTHON = "${python3}/bin/python";

  preBuild = ''

    # patch next.js file-system-cache to use NIXPKGS_HOMEPAGE_CACHE_DIR

    # related:

    # * https://github.com/NixOS/nixpkgs/issues/328621 ("homepage-dashboard: Failed to update prerender cache")

    # * https://github.com/NixOS/nixpkgs/pull/337902 ("nixos/homepage-dashboard: set an explicit cache dir")

    # * https://github.com/NixOS/nixpkgs/issues/458494 ("homepage-dashboard: Dashboard styles are destroyed after a server restart")

    # source file

    substituteInPlace node_modules/next/dist/server/lib/incremental-cache/file-system-cache.js \

      --replace-fail 'this.serverDistDir = ctx.serverDistDir;' \

                     'this.serverDistDir = require("path").join((process.env.NIXPKGS_HOMEPAGE_CACHE_DIR || "/var/cache/homepage-dashboard"), "homepage");'

    # bundled runtimes

    for bundle in node_modules/next/dist/compiled/next-server/*.runtime.prod.js; do

      substituteInPlace "$bundle" \

        --replace-fail 'this.serverDistDir=e.serverDistDir' \

                       'this.serverDistDir=(process.env.NIXPKGS_HOMEPAGE_CACHE_DIR||"/var/cache/homepage-dashboard")+"/homepage"'

    done

  '';

  buildPhase = ''

    runHook preBuild

    mkdir -p config

diff --git a/package.json b/package.json

index 927674f3..e7d45ae6 100644

--- a/package.json

+++ b/package.json

@@ -67,6 +67,9 @@

     "onlyBuiltDependencies": [

       "osx-temperature-sensor",

       "sharp"

-    ]

+    ],

+    "patchedDependencies": {

+      "next": "patches/next.patch"

+    }

   }

 }

diff --git a/patches/next.patch b/patches/next.patch

new file mode 100644

index 00000000..39b17f16

--- /dev/null

+++ b/patches/next.patch

@@ -0,0 +1,13 @@

+diff --git a/dist/server/lib/incremental-cache/file-system-cache.js b/dist/server/lib/incremental-cache/file-system-cache.js

+index cc2cc2506668435d817eaa9f0aa32b568b6aa331..26f0321efcadb4f4255dbd660825759721e799eb 100644

+--- a/dist/server/lib/incremental-cache/file-system-cache.js

++++ b/dist/server/lib/incremental-cache/file-system-cache.js

+@@ -24,7 +24,7 @@ class FileSystemCache {

+     constructor(ctx){

+         this.fs = ctx.fs;

+         this.flushToDisk = ctx.flushToDisk;

+-        this.serverDistDir = ctx.serverDistDir;

++        this.serverDistDir = require("path").join((process.env.NIXPKGS_HOMEPAGE_CACHE_DIR || "/var/cache/homepage-dashboard"), "homepage");

+         this.revalidatedTags = ctx.revalidatedTags;

+         if (ctx.maxMemoryCacheSize) {

+             if (!FileSystemCache.memoryCache) {

diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml

index 2765fe04..11dc6a81 100644

--- a/pnpm-lock.yaml

+++ b/pnpm-lock.yaml

@@ -4,6 +4,11 @@ settings:

   autoInstallPeers: true

   excludeLinksFromLockfile: false

+patchedDependencies:

+  next:

+    hash: 9fc5fd5a09692f0ba1ffb8a979978da9595ed6c3f9bcb0a01205f20fdc39b68c

+    path: patches/next.patch

+

 importers:

   .:

@@ -52,10 +57,10 @@ importers:

         version: 1.2.2

       next:

         specifier: ^15.5.2

-        version: 15.5.2(react-dom@18.3.1(react@18.3.1))(react@18.3.1)

+        version: 15.5.2(patch_hash=9fc5fd5a09692f0ba1ffb8a979978da9595ed6c3f9bcb0a01205f20fdc39b68c)(react-dom@18.3.1(react@18.3.1))(react@18.3.1)

       next-i18next:

         specifier: ^12.1.0

-        version: 12.1.0(next@15.5.2(react-dom@18.3.1(react@18.3.1))(react@18.3.1))(react-dom@18.3.1(react@18.3.1))(react@18.3.1)

+        version: 12.1.0(next@15.5.2(patch_hash=9fc5fd5a09692f0ba1ffb8a979978da9595ed6c3f9bcb0a01205f20fdc39b68c)(react-dom@18.3.1(react@18.3.1))(react@18.3.1))(react-dom@18.3.1(react@18.3.1))(react@18.3.1)

       ping:

         specifier: ^0.4.4

         version: 0.4.4

@@ -5243,7 +5248,7 @@ snapshots:

   net@1.0.2: {}

-  next-i18next@12.1.0(next@15.5.2(react-dom@18.3.1(react@18.3.1))(react@18.3.1))(react-dom@18.3.1(react@18.3.1))(react@18.3.1):

+  next-i18next@12.1.0(next@15.5.2(patch_hash=9fc5fd5a09692f0ba1ffb8a979978da9595ed6c3f9bcb0a01205f20fdc39b68c)(react-dom@18.3.1(react@18.3.1))(react@18.3.1))(react-dom@18.3.1(react@18.3.1))(react@18.3.1):

     dependencies:

       '@babel/runtime': 7.26.9

       '@types/hoist-non-react-statics': 3.3.6

@@ -5251,14 +5256,14 @@ snapshots:

       hoist-non-react-statics: 3.3.2

       i18next: 21.10.0

       i18next-fs-backend: 1.2.0

-      next: 15.5.2(react-dom@18.3.1(react@18.3.1))(react@18.3.1)

+      next: 15.5.2(patch_hash=9fc5fd5a09692f0ba1ffb8a979978da9595ed6c3f9bcb0a01205f20fdc39b68c)(react-dom@18.3.1(react@18.3.1))(react@18.3.1)

       react: 18.3.1

       react-i18next: 11.18.6(i18next@21.10.0)(react-dom@18.3.1(react@18.3.1))(react@18.3.1)

     transitivePeerDependencies:

       - react-dom

       - react-native

-  next@15.5.2(react-dom@18.3.1(react@18.3.1))(react@18.3.1):

+  next@15.5.2(patch_hash=9fc5fd5a09692f0ba1ffb8a979978da9595ed6c3f9bcb0a01205f20fdc39b68c)(react-dom@18.3.1(react@18.3.1))(react@18.3.1):

     dependencies:

       '@next/env': 15.5.2

       '@swc/helpers': 0.5.15

#!/usr/bin/env nix-shell

#!nix-shell -I nixpkgs=./. -i bash -p curl jq git nodejs pnpm sd

#!nix-shell -I nixpkgs=./. -i bash -p curl jq git

# shellcheck shell=bash

set -euo pipefail

nixpkgs="$(pwd)"

cd $(readlink -e $(dirname "${BASH_SOURCE[0]}"))

# Generate the patch file that makes homepage-dashboard aware of the NIXPKGS_HOMEPAGE_CACHE_DIR environment variable.

# Generating the patch this way ensures that both the patch is included, and the lock file is updated.

generate_patch() {

    local version; version="$1"

    echo "Generating homepage-dashboard patch"

    git clone -b "v$version" https://github.com/gethomepage/homepage.git src

    pushd src

    pnpm install

    pnpm patch next

    sd \

      'this.serverDistDir = ctx.serverDistDir;' \

      'this.serverDistDir = require("path").join((process.env.NIXPKGS_HOMEPAGE_CACHE_DIR || "/var/cache/homepage-dashboard"), "homepage");' \

      node_modules/.pnpm_patches/next*/dist/server/lib/incremental-cache/file-system-cache.js

    pnpm patch-commit node_modules/.pnpm_patches/next*

    git add -A .

    git diff -p --staged --no-ext-diff > ../prerender_cache_path.patch

    popd

    rm -rf src

}

# Update the hash of the homepage-dashboard source code in the Nix expression.

update_homepage_dashboard_source() {

    local version; version="$1"

fi

update_homepage_dashboard_source "$LATEST_VERSION"

generate_patch "$LATEST_VERSION"

update_pnpm_deps_hash