topgrade: Add script to update flake and continue on failed step

homes/x86_64-linux/julian@aspi/default.nix

@@ -65,6 +65,7 @@ config, ... }: {
     ## My scripts
     pkgs.frajul.deploy-to-pianopi
     pkgs.frajul.edit-config
+    pkgs.frajul.home-update-flake
   ];
 
   home.file = {

modules/home/topgrade/default.nix

@@ -31,6 +31,9 @@ in {
         misc.no_self_update = true;
         misc.pre_sudo = true; # Cache sudo password for 5 more minutes
         misc.assume_yes = true;
+        misc.no_retry = true;
+
+        pre_commands."Update dotfiles flake" = "home-update-flake";
 
         git = {
           # Additional git repositories to pull

packages/home-update-flake/default.nix

@@ -0,0 +1,41 @@
+{
+# Snowfall Lib provides a customized `lib` instance with access to your flake's library
+# as well as the libraries available from your flake's inputs.
+lib,
+# You also have access to your flake's inputs.
+inputs,
+
+# All other arguments come from NixPkgs. You can use `pkgs` to pull packages or helpers
+# programmatically or you may add the named attributes as arguments here.
+pkgs, stdenv, ... }:
+
+pkgs.writeShellApplication {
+  name = "home-update-flake";
+
+  runtimeInputs = with pkgs; [ ];
+
+  text = ''
+    # Exit when errors occur
+    set -e
+
+    echo "Updating flake..."
+    nix flake update ~/.dotfiles
+
+    set +e
+    git -C ~/.dotfiles diff --quiet flake.lock
+    LOCK_FILE_CHANGED=$?
+    set -e
+    if [[ $LOCK_FILE_CHANGED == 1 ]]; then
+        CURRENT_GENERATION=$(home-manager generations | head -n 1 | cut -d " " -f 5)
+
+        echo "found current gen"
+
+        MESSAGE="Update flake at home-manager generation $CURRENT_GENERATION"
+
+        git -C ~/.dotfiles commit flake.lock -m "$MESSAGE"
+        echo "Updated flake.lock file committed to git!"
+    else
+        echo "No updates available."
+    fi
+  '';
+}