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369 lines
19 KiB
Python
369 lines
19 KiB
Python
#!/usr/bin/env python3
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# -*- coding: utf-8 -*
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# Name: grub.py
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# Purpose: This module contain many functions used for updating grub.cfg file to provide support for EFI/UEFI booting
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# Authors: Sundar
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# Licence: This file is a part of multibootusb package. You can redistribute it or modify
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# under the terms of GNU General Public License, v.2 or above
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import os
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import re
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from . import config
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from . import iso
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from . import _7zip
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from . import gen
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from .usb import bytes2human
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from . import menus
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def mbusb_update_grub_cfg():
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"""
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Function to update grub.cfg file to support UEFI/EFI systems
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:return:
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"""
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# Lets convert syslinux config file to grub2 accepted file format.
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_iso_dir = os.path.join(config.usb_mount, 'multibootusb', iso.iso_basename(config.image_path))
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# First write custom loopback.cfg file so as to be detected by iso2grub2 function later.
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write_custom_gurb_cfg()
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# Try to generate loopback entry file from syslinux config files
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try:
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gen.log('Trying to create loopback.cfg')
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iso2_grub2_cfg = iso2grub2(_iso_dir)
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except Exception as e:
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print(e)
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gen.log(e)
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gen.log('Error converting syslinux cfg to grub2 cfg', error=True)
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iso2_grub2_cfg = False
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grub_cfg_path = None
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syslinux_menu = None
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# sys_cfg_path = None
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loopback_cfg_path = None
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mbus_grub_cfg_path = os.path.join(config.usb_mount, 'multibootusb', 'grub', 'grub.cfg')
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# iso_grub_cfg = iso.iso_file_path(config.image_path, 'grub.cfg')
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if iso.isolinux_bin_dir(config.image_path) is not False:
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iso_sys_cfg_path = os.path.join(iso.isolinux_bin_dir(config.image_path), 'syslinux.cfg')
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iso_iso_cfg_path = os.path.join(iso.isolinux_bin_dir(config.image_path), 'isolinux.cfg')
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if os.path.exists(os.path.join(config.usb_mount, 'multibootusb', iso.iso_basename(config.image_path),
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iso_sys_cfg_path)):
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syslinux_menu = iso_sys_cfg_path.replace('\\', '/')
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elif os.path.exists(os.path.join(config.usb_mount, 'multibootusb', iso.iso_basename(config.image_path),
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iso_iso_cfg_path)):
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syslinux_menu = iso_iso_cfg_path.replace('\\', '/')
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efi_grub_cfg = get_grub_cfg(config.image_path)
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boot_grub_cfg = get_grub_cfg(config.image_path, efi=False)
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loopback_cfg_path = iso.iso_file_path(config.image_path, 'loopback.cfg')
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if loopback_cfg_path is not False:
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grub_cfg_path = loopback_cfg_path.replace('\\', '/')
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elif efi_grub_cfg is not False:
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grub_cfg_path = efi_grub_cfg.replace('\\', '/')
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elif boot_grub_cfg is not False:
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grub_cfg_path = boot_grub_cfg.replace('\\', '/')
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elif iso2_grub2_cfg is not False:
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grub_cfg_path = iso2_grub2_cfg.replace('\\', '/')
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#elif bootx_64_cfg is not False:
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# grub_cfg_path = bootx_64_cfg.replace('\\', '/')
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if os.path.exists(mbus_grub_cfg_path):
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gen.log('Updating grub.cfg file...')
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if grub_custom_menu(mbus_grub_cfg_path, config.distro) is False:
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with open(mbus_grub_cfg_path, 'a') as f:
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f.write("#start " + iso.iso_basename(config.image_path) + "\n")
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if grub_cfg_path is not None:
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if config.distro == 'grub2only':
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f.write(' menuentry ' + iso.iso_basename(config.image_path) + ' {configfile '
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+ '/' + grub_cfg_path.replace('\\', '/') + '}' + "\n")
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else:
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f.write(' menuentry ' + iso.iso_basename(config.image_path) + ' {configfile '
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+ '/multibootusb/' + iso.iso_basename(config.image_path) + '/' + grub_cfg_path + '}' + "\n")
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elif config.distro == 'f4ubcd':
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f.write(' menuentry ' + iso.iso_basename(config.image_path) +
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' {linux /multibootusb/grub.exe --config-file=/multibootusb' +
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iso.iso_basename(config.image_path) + '/menu.lst}'"\n")
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elif config.distro == 'pc-unlocker':
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f.write(' menuentry ' + iso.iso_basename(config.image_path) +
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' {\n linux /ldntldr\n ntldr /ntldr }' + "\n")
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elif config.distro == 'ReactOS':
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f.write(' menuentry ' + iso.iso_basename(config.image_path) +
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' {multiboot /loader/setupldr.sys}' + "\n")
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elif config.distro == 'memdisk_img':
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f.write(menus.memdisk_img_cfg(syslinux=False, grub=True))
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elif config.distro == 'memdisk_iso':
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f.write(menus.memdisk_iso_cfg(syslinux=False, grub=True))
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elif config.distro == 'memtest':
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f.write(' menuentry ' + iso.iso_basename(config.image_path) +
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' {linux16 ' + '/multibootusb/' + iso.iso_basename(config.image_path) + '/BISOLINUX/MEMTEST}' + "\n")
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elif syslinux_menu is not None:
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f.write(' menuentry ' + iso.iso_basename(config.image_path) + ' {syslinux_configfile '
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+ '/multibootusb/' + iso.iso_basename(config.image_path) + '/' + syslinux_menu + '}' + "\n")
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f.write("#end " + iso.iso_basename(config.image_path) + "\n")
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# Ascertain if the entry is made..
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if gen.check_text_in_file(mbus_grub_cfg_path, iso.iso_basename(config.image_path)):
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gen.log('Updated entry in grub.cfg...')
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else:
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gen.log('Unable to update entry in grub.cfg...')
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def write_custom_gurb_cfg():
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"""
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Create custom grub loopback.cfg file for known distros. Custom menu entries are stored on munus.py module
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:return:
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"""
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loopback_cfg_path = os.path.join(config.usb_mount, 'multibootusb', iso.iso_basename(config.image_path), 'loopback.cfg')
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menu = False
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if config.distro == 'pc-tool':
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menu = menus.pc_tool_config(syslinux=False, grub=True)
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elif config.distro == 'rising-av':
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menu = menus.rising(syslinux=False, grub=True)
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if menu is not False:
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gen.log('Writing custom loopback.cfg file...')
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write_to_file(loopback_cfg_path, menu)
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def get_grub_cfg(iso_link, efi=True):
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"""
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Detects path to "grub.cfg" file from ISO file. Default is to get from EFI directory.
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:return: path of "grub.cfg" file as string.
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"""
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if os.path.exists(iso_link):
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grub_path = False
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iso_file_list = _7zip.list_iso(iso_link)
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if any("grub" in s.lower() for s in iso_file_list):
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for f in iso_file_list:
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f_basename = os.path.basename(f).lower()
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if f_basename.startswith('grub') and f_basename.endswith('.cfg'):
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#if 'grub.cfg' in f.lower():
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if efi is True:
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if 'efi' in f.lower():
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grub_path = f.replace('\\', '/')
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gen.log('Found ' + grub_path)
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break
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elif 'boot' in f.lower():
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grub_path = f.replace('\\', '/')
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gen.log('Found ' + grub_path)
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break
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else:
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grub_path = f.replace('\\', '/')
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gen.log('Found ' + grub_path)
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break
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return grub_path
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def grub_custom_menu(mbus_grub_cfg_path, distro):
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iso_size_mb = bytes2human(iso.iso_size(config.image_path))
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gen.log('size of the ISO is ' + str(iso_size_mb))
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if distro in ['sgrubd2', 'raw_iso']:
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grub_raw_iso(mbus_grub_cfg_path)
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# with open(mbus_grub_cfg_path, 'a') as f:
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# f.write("#start " + iso.iso_basename(config.image_path) + "\n")
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# f.write(grub_raw_iso())
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# f.write("#end " + iso.iso_basename(config.image_path) + "\n")
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#
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#
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# elif iso_size_mb < 750.0:
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# grub_raw_iso(mbus_grub_cfg_path)
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else:
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return False
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def grub_raw_iso(mbus_grub_cfg_path):
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"""
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Generic menu entry for booting ISO files directly using memdisk. Should have enough memory to load to RAM
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:return:
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"""
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menu_entry = ' search --set -f /multibootusb/' + iso.iso_basename(config.image_path) + '/' + iso.iso_name(config.image_path) + '\n' \
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' menuentry ' + iso.iso_basename(config.image_path) + ' {\n' \
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' linux16 /multibootusb/memdisk iso raw vmalloc=750M\n' \
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' initrd16 /multibootusb/' + iso.iso_basename(config.image_path) + '/' + iso.iso_name(config.image_path) + '\n' \
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'}\n'
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with open(mbus_grub_cfg_path, 'a') as f:
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f.write("#start " + iso.iso_basename(config.image_path) + "\n")
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f.write(menu_entry)
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f.write("#end " + iso.iso_basename(config.image_path) + "\n")
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return menu_entry
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def string_in_file(_file, search_text):
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"""
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Search if string exist in a file.
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:param _file: Path to file
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:param search_text: String to be searched
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:return: True if string is found
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"""
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if search_text in open(_file).read().lower():
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return True
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def write_to_file(file_path, _strings):
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try:
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if not os.path.exists(file_path):
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open(file_path, 'a').close()
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with open(file_path, 'a') as f:
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f.write(_strings + '\n')
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except:
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gen.log('Error writing to loopback.cfg file..')
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def extract_kernel_line(search_text, match_line, isolinux_dir):
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"""
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Function to check if kernel/linux line present in isolinux.cfg file is valid.
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If valid, then convert them in to grub accepted format
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:param search_text: Type of text is to be searched. Typically kernel or linux
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:param match_line: Line containing kernel ot linux from isolinux supported .cfg files
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:param isolinux_dir: Path to isolinux directory of an ISO
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:return: Valid grub2 accepted kernel/linux line after conversion. If nothing found return ''.
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"""
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kernel_line = ''
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# Remove '=' from linux/kernel parameter
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if (search_text + '=') in match_line:
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kernel_path = match_line.replace((search_text + '='), '').strip()
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search_text = search_text.replace('=', '')
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else:
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kernel_path = match_line.replace(search_text, '', 1).strip()
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# Check if kernel/linux exist using absolute path (kernel_path)
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if os.path.exists(os.path.join(config.usb_mount, kernel_path)):
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kernel_line = search_text.lower().replace('kernel', 'linux') + ' ' + kernel_path.strip()
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# Check if path to kernel/linux exist in isolinux directory and return absolute path
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elif os.path.exists(os.path.join(config.usb_mount, 'multibootusb', iso.iso_basename(config.image_path), isolinux_dir, kernel_path)):
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kernel_line = search_text.lower().replace('kernel', 'linux') + ' /multibootusb/' + \
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iso.iso_basename(config.image_path) + '/' + isolinux_dir + '/' + kernel_path.strip()
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# Check if multiple kernel/linux exist and convert it to grub accepted line
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# Found such entries in manjaro and slitaz
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elif ',/' in kernel_path:
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kernel_line = search_text.lower().replace('kernel', 'linux') + ' ' + kernel_path.strip()
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kernel_line = kernel_line.replace(',/', ' /')
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# Same as above but I found this only in dban
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elif 'z,' in kernel_path:
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kernel_line = search_text.lower().replace('kernel', 'linux') + ' ' + kernel_path.strip()
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kernel_line = kernel_line.replace('z,', ' /multibootusb/' + iso.iso_basename(config.image_path) + '/'
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+ iso.isolinux_bin_dir(config.image_path).replace('\\', '/') + '/')
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else:
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kernel_line = ''
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return kernel_line.replace('\\', '/').replace('//', '/')
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def iso2grub2(iso_dir):
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"""
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Function to convert syslinux configuration to grub2 accepted configuration format. Features implemented are similar
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to that of grub2 'loopback.cfg'. This 'loopback.cfg' file can be later on caled directly from grub2. The main
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advantage of this function is to generate the 'loopback.cfg' file automatically without manual involvement.
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:param iso_dir: Path to distro install directory for looping through '.cfg' files.
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:param file_out: Path to 'loopback.cfg' file. By default it is set to root of distro install directory.
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:return:
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"""
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grub_file_path = os.path.join(config.usb_mount, 'multibootusb', iso.iso_basename(config.image_path), 'loopback.cfg')
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gen.log('loopback.cfg file is set to ' + grub_file_path)
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iso_bin_dir = iso.isolinux_bin_dir(config.image_path)
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# Loop though the distro installed directory for finding config files
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for dirpath, dirnames, filenames in os.walk(iso_dir):
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for f in filenames:
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# We will strict to only files ending with '.cfg' extension. This is the file extension isolinux or syslinux
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# recommends for writing configurations
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if f.endswith((".cfg", ".CFG")):
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cfg_file_path = os.path.join(dirpath, f)
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# We will omit the grub directory
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if 'grub' not in cfg_file_path:
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# we will use only files containing strings which can be converted to grub2 cfg style
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if string_in_file(cfg_file_path, 'menu label') or string_in_file(cfg_file_path, 'label'):
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with open(cfg_file_path, "r", errors='ignore') as cfg_file_str:
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data = cfg_file_str.read()
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# Make sure that lines with menu label, kernel and append are available for processing
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ext_text = re.finditer('(menu label|label)(.*?)(?=(menu label|label))', data, re.I|re.DOTALL)
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if ext_text:
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for m in ext_text:
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menuentry = ''
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# kernel = ''
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kernel_line = ''
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boot_options = ''
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initrd_line = ''
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# initrd = ''
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# Extract line containing 'menu label' and convert to menu entry of grub2
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if 'menu label' in m.group().lower():
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menu_line = re.search('menu label(.*)\s', m.group(), re.I).group()
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menuentry = 'menuentry ' + gen.quote(re.sub(r'menu label', '', menu_line, re.I, ).strip())
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# Ensure that we do not have caps menu label in the menuentry
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menuentry = menuentry.replace('MENU LABEL', '')
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elif 'label ' in m.group().lower():
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# Probably config does not use 'menu label' line. Just line containing 'label'
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# and convert to menu entry of grub2
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menu_line = re.search('^label(.*)\s', m.group(), re.I).group()
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menuentry = 'menuentry ' + gen.quote(re.sub(r'label', '', menu_line, re.I, ).strip())
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# Ensure that we do not have caps label in the menuentry
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menuentry = menuentry.replace('LABEL', '')
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# Extract kernel line and change to linux line of grub2
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if 'kernel' in m.group().lower() or 'linux' in m.group().lower():
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kernel_text = re.findall('((kernel|linux)[= ].*?[ \s])', m.group(), re.I)
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match_count = len(re.findall('((kernel|linux)[= ].*?[ \s])', m.group(), re.I))
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if match_count is 1:
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kernel_line = extract_kernel_line(kernel_text[0][1], kernel_text[0][0], iso_bin_dir)
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elif match_count > 2:
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for _lines in kernel_text:
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kernel_line = extract_kernel_line(_lines[0][1], _lines[0][0],
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iso_bin_dir)
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if kernel_line == '':
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continue
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else:
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break
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if 'initrd' in m.group().lower():
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initrd_text = re.findall('((initrd)[= ].*?[ \s])', m.group(), re.I)
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match_count = len(re.findall('((initrd)[= ].*?[ \s])', m.group(), re.I))
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if match_count is 1:
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initrd_line = extract_kernel_line(initrd_text[0][1], initrd_text[0][0], iso_bin_dir)
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elif match_count > 2:
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for _lines in initrd_text:
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initrd_line = extract_kernel_line(_lines[0][1], _lines[0][0],
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iso_bin_dir)
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if initrd_line == '':
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continue
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else:
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break
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if 'append' in m.group().lower():
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append_line = re.search('append (.*)\s', m.group(), re.I).group()
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boot_options = re.sub(r'((initrd[= ])(.*?)[ ])', '', append_line, re.I, flags=re.DOTALL)
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boot_options = re.sub(r'append', '', boot_options, re.I).strip()
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boot_options = boot_options.replace('APPEND', '')
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if kernel_line.strip():
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linux = kernel_line.strip() + ' ' + boot_options.strip().strip()
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else:
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linux = ''
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if menuentry.strip() and linux.strip() and initrd_line.strip():
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write_to_file(grub_file_path, menuentry + '{')
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write_to_file(grub_file_path, ' ' + linux)
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write_to_file(grub_file_path, ' ' + initrd_line)
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write_to_file(grub_file_path, '}\n')
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elif menuentry.strip() and linux.strip():
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write_to_file(grub_file_path, menuentry + '{')
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write_to_file(grub_file_path, ' ' + linux)
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write_to_file(grub_file_path, '}\n')
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if os.path.exists(grub_file_path):
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gen.log(
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'loopback.cfg file is successfully created.\nYou must send this file for debugging if something goes wrong.')
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return 'loopback.cfg'
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else:
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gen.log('Failed to convert syslinux config file to loopback.cfg')
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return False
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