3 files changed, 48 insertions, 12 deletions
diff --git a/.github/workflows/build-modpack.yml b/.github/workflows/build-modpack.yml
index 35fbf02..aace7f9 100644
--- a/.github/workflows/build-modpack.yml
+++ b/.github/workflows/build-modpack.yml
@@ -1,7 +1,10 @@
-name: build modpack
+name: Build modpack
 
 on:
   push:
+    paths:
+      # only run when prismlauncher modpack files are changed
+      - nix/files/**
   workflow_dispatch:
 
 jobs:
@@ -14,7 +17,7 @@ jobs:
 
       - name: build
         run: |
-          nix build .#getchoo-modpack
+          nix build
 
       - name: upload
         uses: actions/upload-artifact@v3
diff --git a/.github/workflows/update-checksums.yml b/.github/workflows/update-checksums.yml
new file mode 100644
index 0000000..7a5b9a3
--- /dev/null
+++ b/.github/workflows/update-checksums.yml
@@ -0,0 +1,33 @@
+name: Update mod checksums
+
+on:
+  push:
+    paths:
+      # only run when mod files are changed
+      - mods/**
+  workflow_dispatch:
+  workflow_run:
+    workflows: ["Update mods"]
+    types:
+      - completed
+
+permissions:
+  contents: write
+
+jobs:
+  build-modpack:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v3
+      - uses: cachix/install-nix-action@v20
+
+      - name: generate new checksums
+        run: |
+          nix run --impure .#generate-checksums
+
+      - name: commit changes
+        uses: EndBug/add-and-commit@v9
+        with:
+          default_author: github_actions
+          message: "chore(flake): update mod checksums"
diff --git a/.github/workflows/update-mods.yml b/.github/workflows/update-mods.yml
index 9fbfea5..03c3df4 100644
--- a/.github/workflows/update-mods.yml
+++ b/.github/workflows/update-mods.yml
@@ -1,27 +1,27 @@
 name: Update mods
 
 on:
-  workflow_dispatch:
   schedule:
+    # run daily at 0:00 utc
     - cron: "0 0 * * *"
+  workflow_dispatch:
+
+permissions:
+  contents: write
 
 jobs:
   update-mods:
     runs-on: ubuntu-latest
     steps:
-      - name: get packwiz
-        run: |
-          curl -fsSLo ~/packwiz.zip https://nightly.link/packwiz/packwiz/workflows/go/main/Linux%2064-bit%20x86.zip
-          unzip -d ~ ~/packwiz.zip
-          chmod 755 ~/packwiz
-
       - uses: actions/[email protected]
+      - uses: cachix/install-nix-action@v20
 
-      - name: update mods
+      - name: update
         run: |
-          echo "y" | ~/packwiz update --all
+          echo "y" | nix run nixpkgs#packwiz -- update --all
 
-      - uses: EndBug/add-and-commit@v9
+      - name: commit changes
+        uses: EndBug/add-and-commit@v9
         with:
           default_author: github_actions
           message: "chore: update mods"