From 9a09787ad94618fe7bf03bf190cc027e182ddb7a Mon Sep 17 00:00:00 2001
From: Mikey Hoy <mjh@mjhoy.com>
Date: Fri, 3 Nov 2023 08:41:01 -0400
Subject: [PATCH 1/4] update build-nix-env to use nix-env -f <path> option

in the github runners, this seems to work, whereas `nixpkgs.<attr>`
did not. not actually sure why!
---
 scripts/build-nix-env | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/scripts/build-nix-env b/scripts/build-nix-env
index 454ca958..c32b65f2 100755
--- a/scripts/build-nix-env
+++ b/scripts/build-nix-env
@@ -7,11 +7,11 @@
 set -eoux pipefail
 
 echo "Building devEnv"
-nix-build --no-link --show-trace -A devEnv '<nixpkgs>'
+nix-build --no-link --show-trace '<nixpkgs>' -A devEnv
 
 echo "Building nix"
-nix-build --no-link -A nix '<nixpkgs>'
+nix-build --no-link '<nixpkgs>' -A nix
 
 echo "Installing"
-nix-env -iA nixpkgs.devEnv
-nix-env -iA nixpkgs.nix
+nix-env -f '<nixpkgs>' -i devEnv
+nix-env -f '<nixpkgs>' -i nix

From 1840da73f2978af43727d815da240ffc1b22fb66 Mon Sep 17 00:00:00 2001
From: Mikey Hoy <mjh@mjhoy.com>
Date: Fri, 3 Nov 2023 08:41:55 -0400
Subject: [PATCH 2/4] update build step to use newer checkout version

---
 .github/workflows/build.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 4e1e4afa..6b377f55 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -5,7 +5,7 @@ jobs:
   build:
     runs-on: macos-latest
     steps:
-    - uses: actions/checkout@v2.3.4
+    - uses: actions/checkout@v4
       with:
         submodules: true
     - uses: cachix/install-nix-action@v22

From baff9874b9c3f573282b470bb6b73424e9d425de Mon Sep 17 00:00:00 2001
From: Mikey Hoy <mjh@mjhoy.com>
Date: Fri, 3 Nov 2023 08:42:08 -0400
Subject: [PATCH 3/4] add update-nixpkgs script

---
 scripts/update-nixpkgs | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)
 create mode 100755 scripts/update-nixpkgs

diff --git a/scripts/update-nixpkgs b/scripts/update-nixpkgs
new file mode 100755
index 00000000..48ddc15e
--- /dev/null
+++ b/scripts/update-nixpkgs
@@ -0,0 +1,38 @@
+#!/bin/bash
+#
+# This script does the following:
+#
+# 1. Updates `nixpkgs` reference using `niv`
+# 2. Updates the commit referenced in nix/nixpkgs/overlays.nix
+# 3. Commits changes and opens a github PR
+
+set -eou pipefail
+
+if [ -n "$(git status --porcelain)" ]; then
+    echo "git status dirty; exiting";
+    exit 1
+fi
+
+DATE=$(date "+%Y-%m-%d")
+
+BRANCH_NAME=update-nixpkgs-$DATE
+
+git checkout -b $BRANCH_NAME
+
+niv update nixpkgs
+
+git add nix/sources.json
+
+git commit -m "update nixpkgs $DATE"
+
+LATEST_EMACS_REF=$(gh api /repos/nix-community/emacs-overlay/git/ref/heads/master | jq -r '.object.sha')
+
+sed -i '' -e "s|emacs-overlay/archive/.*|emacs-overlay/archive/$LATEST_EMACS_REF.tar.gz;|g" nix/nixpkgs/overlays.nix
+
+git add nix/nixpkgs/overlays.nix
+
+git commit -m "update emacs overlay $DATE"
+
+git push origin $BRANCH_NAME -u
+
+gh pr create --title "update nixpkgs $DATE" --body "generated by scripts/update-nixpkgs"

From 4d701928d430e6bec6f32b818f2f7c0d651a5c16 Mon Sep 17 00:00:00 2001
From: Mikey Hoy <mjh@mjhoy.com>
Date: Fri, 3 Nov 2023 08:42:13 -0400
Subject: [PATCH 4/4] add update scheduled action

---
 .github/workflows/update.yml | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)
 create mode 100644 .github/workflows/update.yml

diff --git a/.github/workflows/update.yml b/.github/workflows/update.yml
new file mode 100644
index 00000000..28485978
--- /dev/null
+++ b/.github/workflows/update.yml
@@ -0,0 +1,26 @@
+name: "Update"
+on:
+  schedule:
+    # Every monday at 9 UTC
+    - cron: '0 9 * * 1'
+jobs:
+  update:
+    runs-on: macos-latest
+    steps:
+    - uses: actions/checkout@v4
+      with:
+        submodules: true
+    - uses: cachix/install-nix-action@v22
+      with:
+        nix_path: nixpkgs=${{ github.workspace }}/nixpkgs
+        install_url: https://releases.nixos.org/nix/nix-2.8.1/install
+    - run: make install
+    - uses: cachix/cachix-action@v12
+      with:
+        name: mjhoy
+        signingKey: '${{ secrets.CACHIX_SIGNING_KEY }}'
+        extraPullNames: nix-community
+    - run: ./scripts/build-nix-env
+    - run: ./scripts/update-nixpkgs
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}