Add a hook for installing dependencies

scripts/Arch/OS/setup.fish

@@ -11,6 +11,10 @@ begin
         arch-chroot $argv
     end
 
+    function installValhallaDeps -V mountDir
+        pacstrap -K "$mountDir" fish jq nix tmux
+    end
+
     function setupOS -S -V dir -V CONFIG_MODULE -V mountDir
         source "$dir/../../Common/Scripts/hooks.fish"
         source "$dir/../../Common/Scripts/wait-network.fish"

scripts/Common/OS/setup.fish

@@ -16,6 +16,13 @@ function runSetup
         end
     end
 
+    if not type -q installValhallaDeps
+        function installValhallaDeps
+            echo 'Please set up the hook `installValhallaDeps` for installing `fish`, `nix` and `tmux`.'
+            exit 1
+        end
+    end
+
     function getCloneFile -S -a path
         set -l relativeDir (realpath --relative-to "$projectRoot" "$dir")
         set -l relativePath (realpath --relative-to "$dir" "$path")
@@ -47,6 +54,7 @@ function runSetup
         cp -r "$channelDir" "$mountDir/$channelDir"
     end
 
+    and runHook installValhallaDeps
     and source "$dir/../../copy-repo.fish" "$mountDir$PROJECT_CLONE_ROOT"
     and runHook setupOS || true
     and runHook autologin || true