diff --git a/opi5-efi.spec b/opi5-efi.spec
index b112362..5571312 100644
--- a/opi5-efi.spec
+++ b/opi5-efi.spec
@@ -16,7 +16,6 @@ Requires: uboot-tools bash
 
 Source0: boot.cmd
 Source1: uEnv.txt
-Source2: post.sh
 
 %description
 This is a hack to get the kernel booting on the Oragne Pi 5
@@ -38,7 +37,21 @@ cp %{SOURCE2} $RPM_BUILD_ROOT/opt/opi5-efi/post.sh
 rm -rf $RPM_BUILD_ROOT
 
 %post
-bash /opt/opi5-efi/post.sh
+BOOT_PART="$(grep '/ ' /etc/fstab | awk '{print $1}')"
+
+cp /opt/opi5-efi/boot.cmd boot/efi/boot.cmd
+cp /opt/opi5-efi/uEnv.txt boot/efi/uEnv.txt
+
+if [ ! -f /boot/initramfs.img ]; then
+    echo "Initramfs not found."
+    exit 1
+fi
+
+echo "rootdev=${BOOT_PART}" >> /boot/efi/uEnv.txt
+sed -i "s/setenvrootdev/setenv rootdev \"${BOOT_PART}\"/" /boot/efi/boot.cmd
+
+mkimage -A arm -T ramdisk -C none -n uInitrd -d /boot/initramfs.img /boot/uInitrd
+mkimage -C none -A arm -T script -d /boot/efi/boot.cmd /boot/efi/boot.scr
 
 %files
 /opt/opi5-efi/*
diff --git a/post.sh b/post.sh
deleted file mode 100644
index 825a137..0000000
--- a/post.sh
+++ /dev/null
@@ -1,19 +0,0 @@
-#!/usr/bin/env bash
-
-set -xeuf -o pipefail
-
-BOOT_PART="$(grep '/ ' /etc/fstab | awk '{print $1}')"
-
-cp /opt/opi5-efi/boot.cmd boot/efi/boot.cmd
-cp /opt/opi5-efi/uEnv.txt boot/efi/uEnv.txt
-
-if [ ! -f "/boot/initramfs.img" ]; then
-    echo "Initramfs not found."
-    exit 1
-fi
-
-echo "rootdev=${BOOT_PART}" >> "/boot/efi/uEnv.txt"
-sed -i "s/setenvrootdev/setenv rootdev \"${BOOT_PART}\"/" "/boot/efi/boot.cmd"
-
-mkimage -A arm -T ramdisk -C none -n uInitrd -d /boot/initramfs.img /boot/uInitrd
-mkimage -C none -A arm -T script -d /boot/efi/boot.cmd /boot/efi/boot.scr