builder_peppermint_void/builder/core/bootloaders.py
2025-04-25 17:43:14 +00:00

529 lines
24 KiB
Python

"""
SPDX-FileCopyrightText: 2023-2025 PeppermintOS Team
(peppermintosteam@proton.me)
SPDX-License-Identifier: GPL-3.0-or-later
This module handles the creation of bootloaders for different architectures and boot methods.
Credits:
- PeppermintOS Team (peppermintosteam@proton.me) - Development and maintenance of the project.
License:
This code is distributed under the GNU General Public License version 3 or later (GPL-3.0-or-later).
For more details, please refer to the LICENSE file included in the project or visit:
https://www.gnu.org/licenses/gpl-3.0.html
"""
import os
import shutil
import subprocess
import tempfile
import logging
import sys
import contextlib
BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
sys.path.insert(0, BASE_DIR)
try:
from builder.core.bootstrap.paths import paths
from builder.configs import logger_config
from builder.core.copy_customizations import copy_grub_theme
except ImportError as e:
print(f"Error importing necessary modules: {e}. Ensure your environment is set up correctly. Details: {e}")
sys.exit(1)
logger = logger_config.setup_logger('bootloaders')
def create_isolinux_boot(architecture, kernel_version, keymap="us", locale="en_US.UTF-8", boot_title="Peppermint OS pep", boot_cmdline="", Volume_ID=""):
"""Generates Isolinux bootloader for BIOS."""
logger.info("=> Starting Isolinux bootloader generation...")
isolinux_dir = os.path.join(paths['IMAGEDIR'], 'boot', 'isolinux')
boot_dir = os.path.join(paths['IMAGEDIR'], 'boot')
os.makedirs(isolinux_dir, exist_ok=True)
# Create boot.cat - usually created by mkisofs/xorriso
boot_cat_path = os.path.join(isolinux_dir, "boot.cat")
open(boot_cat_path, 'w').close()
logger.info(f"=> Created empty boot.cat file: {boot_cat_path} (will be populated by mkisofs/xorriso)")
syslinux_data_dir = os.path.join(paths['PEPTARGETDIR'], "usr/lib/syslinux")
SPLASH_DIR = paths['SPLASH_DIR']
TEMPLATES_DIR = paths['TEMPLATES_DIR']
splash_image_path = os.path.join(SPLASH_DIR, "splash.png")
logger.info(f"=> Destination Isolinux directory: {isolinux_dir}")
logger.info(f"=> Syslinux data source directory: {syslinux_data_dir}")
logger.info(f"=> Splash image path: {splash_image_path}")
# 1. Copy Syslinux files
syslinux_files = [
"isolinux.bin", "ldlinux.c32", "libcom32.c32", "vesamenu.c32",
"libutil.c32", "chain.c32", "reboot.c32", "poweroff.c32"
]
logger.info("=> Copying Syslinux files...")
for file in syslinux_files:
source_file = os.path.join(syslinux_data_dir, file)
destination_file = os.path.join(isolinux_dir, file)
if os.path.exists(source_file):
shutil.copy2(source_file, destination_file)
logger.debug(f" Copied: {file}")
else:
logger.warning(f" Syslinux file not found: {source_file}. Ignoring.")
# 2. Copy and configure isolinux.cfg
logger.info("=> Copying and configuring isolinux.cfg...")
isolinux_cfg_in_path = os.path.join(TEMPLATES_DIR, "isolinux", "isolinux.cfg.in")
isolinux_cfg_path = os.path.join(isolinux_dir, "isolinux.cfg")
try:
with open(isolinux_cfg_in_path, 'r') as f_in:
isolinux_cfg_content = f_in.read()
# Perform replacements - consolidated replacements
replacements = {
"@@SPLASHIMAGE@@": os.path.basename(splash_image_path),
"@@KERNVER@@": kernel_version,
"@@KEYMAP@@": keymap,
"@@ARCH@@": architecture,
"@@LOCALE@@": locale,
"@@BOOT_TITLE@@": boot_title,
"@@BOOT_CMDLINE@@": boot_cmdline,
"@@Volume_ID@@": Volume_ID
}
for placeholder, value in replacements.items():
isolinux_cfg_content = isolinux_cfg_content.replace(placeholder, value)
with open(isolinux_cfg_path, 'w') as f_out:
f_out.write(isolinux_cfg_content)
logger.debug(f" isolinux.cfg file created at: {isolinux_cfg_path}")
except FileNotFoundError:
logger.error(f" isolinux.cfg.in template file not found: {isolinux_cfg_in_path}. Failed to create isolinux.cfg")
return None
except Exception as e:
logger.error(f" Error processing or creating isolinux.cfg: {e}")
return None
# 3. Copy splash image
logger.info("=> Copying splash image...")
if os.path.exists(splash_image_path):
splash_destination_path = os.path.join(isolinux_dir, os.path.basename(splash_image_path))
shutil.copy2(splash_image_path, splash_destination_path)
logger.debug(f" Splash image copied to: {splash_destination_path}")
else:
logger.warning(f" Splash image not found: {splash_image_path}. Ignoring.")
# 4 & 5. Copy memtest86+ and memtest86+ EFI (if exist) - Combined similar logic
memtest_files = {
"memtest.bin": os.path.join(paths['PEPTARGETDIR'], "boot", "memtest86+", "memtest.bin"),
"memtest.efi": os.path.join(paths['PEPTARGETDIR'], "boot", "memtest86+", "memtest.efi")
}
for filename, source_path in memtest_files.items():
dest_path = os.path.join(boot_dir, filename)
if os.path.exists(source_path):
logger.info(f"=> Copying {filename}...")
shutil.copy2(source_path, dest_path)
logger.debug(f" {filename} copied to: {dest_path}")
else:
logger.info(f"=> {filename} not found in PEPTARGETDIR. Ignoring.")
logger.info("=> Isolinux bootloader generated successfully.")
return isolinux_dir
def create_grub_efi_boot(architecture, paths, grub_cfg_template_dir, memtest_wanted, config, logger, pep_target_path, platform_cmdline, splash_image, grub_themes, grub_modules, boot_dir, kernel_version, boot_cmdline="", boot_title="Peppermint OS pep", keymap="us", locale="en_US.UTF-8"):
"""Generates GRUB EFI bootloader."""
logger.info("=> Starting GRUB EFI bootloader generation...")
grub_platform = f"{architecture}-efi"
grub_dir = os.path.join(paths['IMAGEDIR'], 'boot', 'grub')
pep_target_path = paths['PEPTARGETDIR']
iso_image_boot_dir = paths['IMAGEDIR']
grub_data_dir = pep_target_path + "/usr/share/grub"
TEMPLATES_DIR = paths['TEMPLATES_DIR']
SPLASH_DIR = paths['SPLASH_DIR']
SPLASH_THEMES_DIR = os.path.join(BASE_DIR, "peppermint/grub/themes")
iso_boot_path = os.path.join(paths['IMAGEDIR'], 'boot')
copy_grub_theme(SPLASH_THEMES_DIR, iso_boot_path)
os.makedirs(grub_dir, exist_ok=True)
# 1. Copy additional files from TEMPLATES_DIR
logger.info("=> Copying additional template files to the GRUB directory...")
# Source directory for templates
templates_grub_dir = os.path.join(TEMPLATES_DIR, "grub")
# List of files to copy
files_to_copy = ["grub.cfg"]
logger.info("=> Copying template files to the GRUB directory...")
for filename in files_to_copy:
source_path = os.path.join(templates_grub_dir, filename)
dest_path = os.path.join(grub_dir, filename)
if os.path.exists(source_path):
shutil.copy2(source_path, dest_path)
logger.debug(f" Copied template file: {filename} to: {dest_path}")
else:
logger.warning(f" Template file not found: {filename} in: {source_path}")
# Copy splash image from SPLASH_DIR to grub_dir
splash_source = os.path.join(SPLASH_DIR, "splash.png")
splash_dest = os.path.join(grub_dir, "splash.png")
if os.path.exists(splash_source):
shutil.copy2(splash_source, splash_dest)
logger.debug(f" Copied splash image from: {splash_source} to: {splash_dest}")
else:
logger.warning(f" Splash image not found in: {splash_source}")
kernel_img_name = "vmlinuz"
want_memtest = True
if architecture == "aarch64":
kernel_img_name = "vmlinux"
want_memtest = False
elif architecture == "x86_64":
kernel_img_name = "vmlinuz"
logger.info(f"=> Destination GRUB directory: {grub_dir}")
logger.info(f"=> GRUB data source directory: {grub_data_dir}")
logger.info(f"=> Kernel image name: {kernel_img_name}")
logger.info(f"=> Want memtest86+: {want_memtest}")
# 1. Prepare GRUB directory and copy font
logger.info("=> Preparing GRUB directory and copying fonts...")
os.makedirs(os.path.join(grub_dir, "fonts"), exist_ok=True)
unicode_pf2_source = os.path.join(grub_data_dir, "unicode.pf2")
unicode_pf2_dest = os.path.join(grub_dir, "fonts", "unicode.pf2")
if os.path.exists(unicode_pf2_source):
shutil.copy2(unicode_pf2_source, unicode_pf2_dest)
logger.debug(f" Copied unicode.pf2 font to: {unicode_pf2_dest}")
else:
logger.warning(f" unicode.pf2 font not found in: {unicode_pf2_source}. Ignoring.")
# 2. Create EFI vfat image
logger.info("=> Creating EFI vfat image...")
efi_img_path = os.path.join(grub_dir, "efiboot.img")
try:
subprocess.run(["truncate", "-s", "32M", efi_img_path], check=True, text=True)
subprocess.run(["mkfs.vfat", "-F12", "-S", "512", "-n", "grub_uefi", efi_img_path], check=True, text=True)
logger.debug(f" EFI vfat image created: {efi_img_path}")
except subprocess.CalledProcessError as e:
logger.error(f" Error creating EFI vfat image: {e.stderr}")
return None
# 3. Mount vfat image and build GRUB image function
grub_efi_tmpdir = tempfile.mkdtemp(dir=paths['BUILDDIR'], prefix="grub-efi.")
loop_device = None
try:
loop_device_output = subprocess.run(["losetup", "--show", "--find", efi_img_path], check=True, text=True, capture_output=True)
# Check if loop_device_output is None or has an error
if loop_device_output is None or loop_device_output.returncode != 0:
logger.error(f" Error: loop_device_output is None or has an error. losetup command failed? Stderr: {loop_device_output.stderr.decode()}")
return None
loop_device = loop_device_output.stdout.strip()
subprocess.run(["mount", "-o", "rw,loop,offset=0", loop_device, grub_efi_tmpdir], check=True, text=True)
logger.debug(f" EFI vfat image mounted at: {grub_efi_tmpdir}, loop device: {loop_device}")
# Copy boot dir
logger.info("=> Copying boot directory and building GRUB images for architecture...")
copy_boot_directory_contents(os.path.join(iso_image_boot_dir, 'boot'), os.path.join(pep_target_path, 'boot'))
logger.debug(f" => Boot directory copied to: {os.path.join(pep_target_path, 'boot')}")
# Generate the content of grub_pep.cfg
desktop_environment = config.get("desktop", "XFCE")
kernel_flavor_name = config.get("kernel_flavor", "current")
logger.debug(f" Value of boot_cmdline being passed to generate_grub_pep_cfg: '{boot_cmdline}'")
grub_pep_cfg_content = generate_grub_pep_cfg(
kernel_version=kernel_version,
boot_cmdline=boot_cmdline,
boot_title=boot_title,
keymap=keymap,
locale=locale,
architecture=architecture,
want_memtest=want_memtest,
splash_image=splash_image,
SPLASH_DIR=paths['SPLASH_DIR']
)
# Write the content to the grub_pep.cfg file
grub_pep_cfg_path = os.path.join(grub_dir, "grub_pep.cfg")
with open(grub_pep_cfg_path, "w") as f:
f.write(grub_pep_cfg_content)
logger.info(f" grub_pep.cfg generated at: {grub_pep_cfg_path}")
def build_grub_image(architecture, grub_arch, efi_arch, grub_platform):
"""Internal function to build the GRUB EFI image for an architecture."""
logger.info(f"Building GRUB EFI image for architecture: {architecture}")
logger.info(f" => Building GRUB EFI image for GRUB arch: {grub_arch}, EFI: {efi_arch}...")
efi_file_tmp_path = os.path.join("/tmp", f"boot{efi_arch.lower()}.efi")
grub_mkstandalone_command = [
"xbps-uchroot",
pep_target_path,
"grub-mkstandalone",
"--",
f"--directory=/usr/lib/grub/{grub_platform}",
f"--format={grub_platform}",
f"--format={grub_platform}",
f"--output={efi_file_tmp_path}",
f"boot/grub/grub.cfg"
]
try:
logger.debug(f" => Creating EFI/BOOT directory in: {os.path.join(grub_efi_tmpdir, 'EFI', 'BOOT')}")
subprocess.run(["mkdir", "-p", os.path.join(grub_efi_tmpdir, "EFI", "BOOT")], check=True)
logger.debug(f" EFI/BOOT directory created successfully.")
logger.debug(f" => Executing grub-mkstandalone command [CHROOT: {pep_target_path}]: {' '.join(grub_mkstandalone_command)}")
subprocess.run(grub_mkstandalone_command, check=True,text=True)
logger.debug(f" grub-mkstandalone command executed successfully.")
efi_boot_dir_in_tmpfs = os.path.join(grub_efi_tmpdir, "EFI", "BOOT")
os.makedirs(efi_boot_dir_in_tmpfs, exist_ok=True)
efi_source_path_on_host = os.path.join(pep_target_path, "tmp", f"boot{efi_arch.lower()}.efi")
efi_file_destination = os.path.join(efi_boot_dir_in_tmpfs, f"BOOT{efi_arch.upper()}.EFI")
shutil.copy2(efi_source_path_on_host, efi_file_destination)
logger.debug(f" EFI loader copied to: {efi_file_destination}")
except subprocess.CalledProcessError as e:
logger.error(f" Error generating EFI loader (grub-mkstandalone): {e}")
raise
except OSError as e:
logger.error(f" OSError during grub-mkstandalone: {e}")
raise
except Exception as e:
logger.error(f" Unexpected error during grub-mkstandalone: {e}")
raise
efi_images = {}
if architecture in ["i686", "x86_64"]:
for arch in ["i686", "x86_64"]:
if arch == "i686":
grub_arch = "i386"
efi_arch = "ia32"
grub_platform = "i386-efi"
elif arch == "x86_64":
grub_arch = "x86_64"
efi_arch = "x64"
grub_platform = "x86_64-efi"
efi_images[arch] = build_grub_image(architecture, grub_arch, efi_arch, grub_platform)
elif architecture == "aarch64":
grub_platform = "arm64-efi"
build_grub_image(architecture, "arm64", "aa64", grub_platform)
logger.info("=> Copying EFI boot files from efiboot.img to ISO root...")
efi_boot_dest_in_iso = os.path.join(paths['IMAGEDIR'], 'EFI', 'BOOT')
os.makedirs(efi_boot_dest_in_iso, exist_ok=True)
try:
mount_point = tempfile.mkdtemp(dir=paths['BUILDDIR'], prefix="efi-img-mnt.")
subprocess.run(["mount", "-o", "loop", efi_img_path, mount_point], check=True, text=True)
logger.debug(f" efiboot.img mounted at: {mount_point}")
efi_boot_source_in_img = os.path.join(mount_point, 'EFI', 'BOOT')
if os.path.exists(efi_boot_source_in_img):
for item in os.listdir(efi_boot_source_in_img):
source = os.path.join(efi_boot_source_in_img, item)
destination = os.path.join(efi_boot_dest_in_iso, item)
if os.path.isdir(source):
shutil.copytree(source, destination, dirs_exist_ok=True)
logger.debug(f" Copied EFI directory: {source} to {destination}")
else:
shutil.copy2(source, destination)
logger.debug(f" Copied EFI file: {source} to {destination}")
else:
logger.warning(f" EFI/BOOT directory not found in {efi_boot_source_in_img}")
except subprocess.CalledProcessError as e:
logger.error(f" Error mounting or copying files from efiboot.img: {e}")
except FileNotFoundError as e:
logger.error(f" File not found: {e}")
except Exception as e:
logger.error(f" Unexpected error while copying EFI files: {e}")
finally:
if 'mount_point' in locals():
subprocess.run(["umount", mount_point], check=True, text=True)
os.rmdir(mount_point)
logger.debug(f" efiboot.img unmounted from: {mount_point} and directory removed.")
logger.info("=> GRUB EFI bootloader generated successfully.")
return grub_dir
except subprocess.CalledProcessError as e:
logger.error(f"Error executing subprocess commands for GRUB EFI: {e}")
return None
except Exception as e:
logger.error(f"Unexpected error while generating GRUB EFI: {e}")
return None
finally:
if grub_efi_tmpdir:
try:
subprocess.run(["umount", grub_efi_tmpdir], check=True)
logger.debug(f" EFI vfat image unmounted from: {grub_efi_tmpdir}")
except subprocess.CalledProcessError as e:
logger.warning(f" Warning: Failed to unmount EFI vfat image: {e}")
if loop_device:
try:
subprocess.run(["losetup", "--detach", loop_device], check=True)
logger.debug(f" Loop device {loop_device} detached.")
except subprocess.CalledProcessError as e:
logger.warning(f" Warning: Failed to detach loop device {loop_device}: {e}")
if grub_efi_tmpdir:
shutil.rmtree(grub_efi_tmpdir, ignore_errors=True)
logger.debug(f" Temporary directory {grub_efi_tmpdir} removed.")
def copy_boot_directory_contents(source_boot_dir, dest_boot_dir):
"""Copies contents of source boot dir to dest boot dir, merging if necessary."""
logger.info(f" => Copying boot directory contents from: {source_boot_dir} to: {dest_boot_dir} (merge)...")
os.makedirs(dest_boot_dir, exist_ok=True)
for item in os.listdir(source_boot_dir):
s_item = os.path.join(source_boot_dir, item)
d_item = os.path.join(dest_boot_dir, item)
if os.path.isdir(s_item):
logger.debug(f" Merging directory: {item}")
shutil.copytree(s_item, d_item, dirs_exist_ok=True)
else:
logger.debug(f" Copying file: {item}")
shutil.copy2(s_item, d_item)
logger.debug(" => Boot directory contents copied/merged successfully.")
def generate_grub_pep_cfg(kernel_version, boot_cmdline, boot_title, keymap, locale, architecture, want_memtest, splash_image, SPLASH_DIR):
"""Generates the content of grub_pep.cfg using the provided template."""
grub_pep_cfg_template = """
set pager="1"
set locale_dir="(${peppermintos})/boot/grub/locale"
set theme="(${peppermintos})/boot/grub/themes/peppermint/theme.txt"
if [ -e "${prefix}/${grub_cpu}-${grub_platform}/all_video.mod" ]; then
insmod all_video
else
insmod efi_gop
insmod efi_uga
insmod video_bochs
insmod video_cirrus
fi
insmod font
if loadfont "(${peppermintos})/boot/grub/fonts/unicode.pf2" ; then
insmod gfxterm
set gfxmode="auto"
terminal_input console
terminal_output gfxterm
insmod png
background_image "(${peppermintos})/boot/isolinux/@@SPLASHIMAGE@@"
fi
# Set default menu entry
default=linux
timeout=15
timeout_style=menu
# GRUB init tune for accessibility
play 600 988 1 1319 4
if [ cpuid -l ]; then
menuentry "@@BOOT_TITLE@@ @@KERNVER@@ (@@ARCH@@)" --id "linux" {
set gfxpayload="keep"
linux (${peppermintos})/boot/vmlinuz \\
root=live:CDLABEL=PEPPERMINTOS ro init=/sbin/init \\
rd.luks=0 rd.md=0 rd.dm=0 loglevel=4 gpt add_efi_memmap \\
vconsole.unicode=1 vconsole.keymap=@@KEYMAP@@ \\
locale.LANG=@@LOCALE@@ @@BOOT_CMDLINE@@
initrd (${peppermintos})/boot/initrd
}
menuentry "@@BOOT_TITLE@@ @@KERNVER@@ (@@ARCH@@) (RAM)" --id "linuxram" {
set gfxpayload="keep"
linux (${peppermintos})/boot/vmlinuz \\
root=live:CDLABEL=PEPPERMINTOS ro init=/sbin/init \\
rd.luks=0 rd.md=0 rd.dm=0 loglevel=4 gpt add_efi_memmap \\
vconsole.unicode=1 vconsole.keymap=@@KEYMAP@@ \\
locale.LANG=@@LOCALE@@ @@BOOT_CMDLINE@@ rd.live.ram
initrd (${peppermintos})/boot/initrd
}
menuentry "@@BOOT_TITLE@@ @@KERNVER@@ (@@ARCH@@) (graphics disabled)" --id "linuxnogfx" {
set gfxpayload="keep"
linux (${peppermintos})/boot/vmlinuz \\
root=live:CDLABEL=PEPPERMINTOS ro init=/sbin/init \\
rd.luks=0 rd.md=0 rd.dm=0 loglevel=4 gpt add_efi_memmap \\
vconsole.unicode=1 vconsole.keymap=@@KEYMAP@@ \\
locale.LANG=@@LOCALE@@ @@BOOT_CMDLINE@@ nomodeset
initrd (${peppermintos})/boot/initrd
}
menuentry "@@BOOT_TITLE@@ @@KERNVER@@ (@@ARCH@@)" with speech --hotkey s --id "linuxa11y" {
set gfxpayload="keep"
linux (${peppermintos})/boot/vmlinuz \\
root=live:CDLABEL=PEPPERMINTOS ro init=/sbin/init \\
rd.luks=0 rd.md=0 rd.dm=0 loglevel=4 gpt add_efi_memmap \\
vconsole.unicode=1 vconsole.keymap=@@KEYMAP@@ \\
locale.LANG=@@LOCALE@@ @@BOOT_CMDLINE@@ live.accessibility live.autologin
initrd (${peppermintos})/boot/initrd
}
menuentry "@@BOOT_TITLE@@ @@KERNVER@@ (@@ARCH@@) with speech (RAM)" --hotkey r --id "linuxa11yram" {
set gfxpayload="keep"
linux (${peppermintos})/boot/vmlinuz \\
root=live:CDLABEL=PEPPERMINTOS ro init=/sbin/init \\
rd.luks=0 rd.md=0 rd.dm=0 loglevel=4 gpt add_efi_memmap \\
vconsole.unicode=1 vconsole.keymap=@@KEYMAP@@ \\
locale.LANG=@@LOCALE@@ @@BOOT_CMDLINE@@ live.accessibility live.autologin rd.live.ram
initrd (${peppermintos})/boot/initrd
}
menuentry "@@BOOT_TITLE@@ @@KERNVER@@ (@@ARCH@@) with speech (graphics disabled)" --hotkey g --id "linuxa11ynogfx" {
set gfxpayload="keep"
linux (${peppermintos})/boot/vmlinuz \\
root=live:CDLABEL=PEPPERMINTOS ro init=/sbin/init \\
rd.luks=0 rd.md=0 rd.dm=0 loglevel=4 gpt add_efi_memmap \\
vconsole.unicode=1 vconsole.keymap=@@KEYMAP@@ \\
locale.LANG=@@LOCALE@@ @@BOOT_CMDLINE@@ live.accessibility live.autologin nomodeset
initrd (${peppermintos})/boot/initrd
}
if [ "${grub_platform}" == "efi" ]; then
menuentry "Run Memtest86+ (RAM test)" --hotkey m --id memtest {
set gfxpayload="keep"
linux (${peppermintos})/boot/memtest.efi
}
menuentry 'UEFI Firmware Settings' --hotkey f --id uefifw {
fwsetup
}
else
menuentry "Run Memtest86+ (RAM test)" --id memtest {
set gfxpayload="keep"
linux (${peppermintos})/boot/memtest.bin
}
fi
menuentry "System restart" --hotkey b --id restart {
echo "System rebooting..."
reboot
}
menuentry "System shutdown" --hotkey p --id poweroff {
echo "System shutting down..."
halt
}
fi
"""
splash_image_path = os.path.join(SPLASH_DIR, "splash.png") if SPLASH_DIR else " "
grub_pep_cfg_content = grub_pep_cfg_template.replace("@@BOOT_TITLE@@", boot_title)
grub_pep_cfg_content = grub_pep_cfg_content.replace("@@KERNVER@@", kernel_version)
grub_pep_cfg_content = grub_pep_cfg_content.replace("@@ARCH@@", architecture)
grub_pep_cfg_content = grub_pep_cfg_content.replace("@@KEYMAP@@", keymap)
grub_pep_cfg_content = grub_pep_cfg_content.replace("@@LOCALE@@", locale)
grub_pep_cfg_content = grub_pep_cfg_content.replace("@@BOOT_CMDLINE@@", boot_cmdline)
grub_pep_cfg_content = grub_pep_cfg_content.replace("@@SPLASHIMAGE@@", os.path.basename(splash_image_path) if splash_image_path and os.path.exists(splash_image_path) else " ")
return grub_pep_cfg_content