init

bls-add-bluefin.sh

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+#!/usr/bin/env bash
+set -euo pipefail
+shopt -s nullglob
+
+entries_dir="/boot/loader/entries"
+
+for f in "$entries_dir"/ostree-*.conf "$entries_dir"/*-ostree-*.conf; do
+  [ -f "$f" ] || continue
+
+  # Already correct? skip
+  if grep -qxE 'grub_class[[:space:]]+bluefin' "$f"; then
+    continue
+  fi
+
+  tmp="$(mktemp)"
+  if grep -qE '^grub_class[[:space:]]+' "$f"; then
+    sed -E 's/^grub_class[[:space:]].*/grub_class bluefin/' "$f" >"$tmp"
+  else
+    awk '1; /^title[[:space:]]/{print "grub_class bluefin";}' "$f" >"$tmp"
+  fi
+
+  if ! cmp -s "$f" "$tmp"; then
+    chmod --reference="$f" "$tmp"
+    chown --reference="$f" "$tmp"
+    command -v chcon >/dev/null 2>&1 && chcon --reference="$f" "$tmp" 2>/dev/null || true
+    mv -f "$tmp" "$f"
+  else
+    rm -f "$tmp"
+  fi
+done

bluefin-icons.conf

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+[Service]
+ExecStartPost=
+ExecStopPost=/usr/bin/bash --noprofile --norc -lc '/usr/local/sbin/bls-add-bluefin.sh'
+StandardOutput=journal
+StandardError=journal
+Environment=STARSHIP_LOG=off

readme.md

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+<img src="bluefin.png" width="48" height="48">
+
+# Auto GRUB Class Setup for Bluefin
+
+## Introduction
+
+GRUB themes display icons according to each entry's class. On some rpm-ostree systems, including Bluefin, new boot entries are created without a class, which means no icon is shown in the menu. 
+
+This setup fixes that by adding a dedicated Bluefin icon to your active GRUB theme and installing a helper script that ensures every BootLoaderSpec (BLS) entry includes `grub_class bluefin`. With this in place, GRUB automatically picks up the correct icon and your Bluefin deployments appear with their own distinctive symbol in the boot menu.
+
+(Developed and tested on `bluefin-dx:latest-42.20251012.1`)
+
+## Acknowledgements
+
+This setup borrows the icon for the Bluefin GRUB [theme created by Raindrac](https://github.com/Raindrac/Banner/) and is inspired by and meant as a replacement for a previous [solution by Tomasz Drozdz](https://codeberg.org/TomaszDrozdz/Fedora-Silverblue-rpm-ostree-generate-grub-theme-icon-class).
+
+## Installation
+
+If you don't have a GRUB theme installed, [check these out](https://www.gnome-look.org/browse?cat=109&ord=latest). I am currently using [this one](https://www.gnome-look.org/p/2227016).
+
+### 1. Find the icons folder of your currently used GRUB theme
+
+```bash
+sudo awk -F= '/set theme=/ {f=$2; sub(/\/[^/]*$/, "", f); print f "/icons"}' /boot/grub2/user.cfg
+```
+
+should print something like `"/boot/grub2/themes/<theme>/icons`
+
+### 2. Copy bluefin icon to that folder
+
+```bash
+sudo cp bluefin.png /boot/grub2/themes/<theme>/icons/
+```
+
+### 3. Install helper script
+
+```bash
+sudo cp bls-add-bluefin.sh /usr/local/sbin/
+sudo chmod 755 /usr/local/sbin/bls-add-bluefin.sh
+```
+
+### 4. Install rpm-ostree hook
+
+```bash
+sudo mkdir -p /etc/systemd/system/ostree-finalize-staged.service.d
+sudo cp bluefin-icons.conf /etc/systemd/system/ostree-finalize-staged.service.d/
+```
+
+### 5. (Optional) Test helper script
+
+```bash
+sudo /usr/local/sbin/bls-add-bluefin.sh
+grep -n '^grub_class' /boot/loader/entries/ostree*.conf
+
+# Expected Result
+
+/boot/loader/entries/ostree-1.conf
+     2:	grub_class bluefin
+
+/boot/loader/entries/ostree-2.conf
+     2:	grub_class bluefin
+
+```
+