diff --git a/opi5-efi.spec b/opi5-efi.spec
index d5a0ea6..fdae83a 100644
--- a/opi5-efi.spec
+++ b/opi5-efi.spec
@@ -5,16 +5,17 @@
 
 Name: opi5-efi
 Version: 0.0.2
-Release: 1%{?dist}
+Release: 2%{?dist}
 Summary: Necessary files for booting from vendor U-Boot on Orange Pi 5
 License: GPL
 Provides: %{name}-%{version}
-Requires: kernel-opi5-tfg uboot-tools
+Requires: kernel-opi5-tfg uboot-tools bash
 
 %global full_ver %{version}-%{release}
 
 Source0: boot.cmd
 Source1: uEnv.txt
+Source2: post.sh
 
 %description
 This is a hack to get the kernel booting on the Oragne Pi 5
@@ -30,36 +31,14 @@ rm -rf $RPM_BUILD_ROOT
 mkdir -p $RPM_BUILD_ROOT/opt/opi5-efi
 cp %{SOURCE0} $RPM_BUILD_ROOT/opt/opi5-efi/boot.cmd
 cp %{SOURCE1} $RPM_BUILD_ROOT/opt/opi5-efi/uEnv.txt
+cp %{SOURCE2} $RPM_BUILD_ROOT/opt/opi5-efi/post.sh
+sed -i "s/replacewithfullver/FULL_VER=%{full_ver}/" $RPM_BUILD_ROOT/opt/opi5-efi/post.sh
 
 %clean
 rm -rf $RPM_BUILD_ROOT
 
-%posttrans
-set -xeuf -o pipefail
-
-cp /opt/opi5-efi/boot.cmd /boot/efi/boot.cmd-%{full_ver}
-cp /opt/opi5-efi/uEnv.txt /boot/efi/uEnv.txt-%{full_ver}
-
-if [ -f /boot/.uname ]; then
-    UNAME_R=$(</boot/.uname)
-    BOOT_PART=$(grep '/ ' /etc/fstab | awk '{print $1}')
-
-    echo "rootdev=${BOOT_PART}" >> /boot/efi/uEnv.txt-%{full_ver}
-    sed -i "s/setenvrootdev/setenv rootdev \"${BOOT_PART}\"/" /boot/efi/boot.cmd-%{full_ver}
-    sed -i "s/setenvunamer/setenv unamer \"${UNAME_R}\"/" /boot/efi/boot.cmd-%{full_ver}
-else
-    echo "ERROR: No /boot/.uname found to extract 'uname -r' from."
-    exit 1
-fi
-
-mkimage -A arm -T ramdisk -C none -n uInitrd -d /boot/initramfs-${UNAME_R}.img /boot/uInitrd-${UNAME_R}
-cp /boot/uInitrd-${UNAME_R} /boot/uInitrd
-
-mkimage -C none -A arm -T script -d /boot/efi/boot.cmd-%{full_ver} /boot/efi/boot.scr-%{full_ver}
-cp /boot/efi/boot.scr-%{full_ver} /boot/efi/boot.scr
-
-diff /boot/efi/boot.cmd /boot/efi/boot.cmd-%{full_ver} > /boot/diff_boot_cmd
-diff /boot/efi/uEnv.txt /boot/efi/uEnv.txt-%{full_ver} > /boot/diff_uenv_txt
+%post
+bash /opt/opi5-efi/post.sh
 
 %files
 /opt/opi5-efi/*
diff --git a/post.sh b/post.sh
new file mode 100644
index 0000000..14c0616
--- /dev/null
+++ b/post.sh
@@ -0,0 +1,33 @@
+#!/usr/bin/env bash
+
+set -xeuf -o pipefail
+
+UNAME_R="$(</boot/.uname)"
+BOOT_PART="$(grep '/ ' /etc/fstab | awk '{print $1}')"
+replacewithfullver
+
+cp /opt/opi5-efi/boot.cmd "/boot/efi/boot.cmd-${FULL_VER}"
+cp /opt/opi5-efi/uEnv.txt "/boot/efi/uEnv.txt-${FULL_VER}"
+
+if [ ! -f /boot/.uname ]; then
+    echo "ERROR: No /boot/.uname found to extract 'uname -r' from."
+    exit 1
+fi
+
+if [ ! -f "/boot/initramfs-${UNAME_R}" ]; then
+    echo "ERROR: No initramfs found."
+    exit 1
+fi
+
+echo "rootdev=${BOOT_PART}" >> "/boot/efi/uEnv.txt-${FULL_VER}"
+sed -i "s/setenvrootdev/setenv rootdev \"${BOOT_PART}\"/" "/boot/efi/boot.cmd-${FULL_VER}"
+sed -i "s/setenvunamer/setenv unamer \"${UNAME_R}\"/" "/boot/efi/boot.cmd-${FULL_VER}"
+
+mkimage -A arm -T ramdisk -C none -n uInitrd -d "/boot/initramfs-${UNAME_R}.img" "/boot/uInitrd-${UNAME_R}"
+cp "/boot/uInitrd-${UNAME_R}" /boot/uInitrd
+
+mkimage -C none -A arm -T script -d "/boot/efi/boot.cmd-${FULL_VER}" "/boot/efi/boot.scr-${FULL_VER}"
+cp "/boot/efi/boot.scr-${FULL_VER}" /boot/efi/boot.scr
+
+diff /boot/efi/boot.cmd "/boot/efi/boot.cmd-${FULL_VER}" > /boot/diff_boot_cmd
+diff /boot/efi/uEnv.txt "/boot/efi/uEnv.txt-${FULL_VER}" > /boot/diff_uenv_txt