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#
# Copyright (C) 2024 Soleta Networks <info@soleta.eu>
#
# This program is free software: you can redistribute it and/or modify it under
# the terms of the GNU Affero General Public License as published by the
# Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
import logging
import os
import fdisk
from src.log import OgError
from src.utils.disk import *
from src.utils.uefi import is_uefi_supported
class FstabEntry(object):
def __init__(self, device, mountpoint, fstype, options,
dump_code='0', pass_code='0'):
self.device = device
self.mountpoint = mountpoint
self.fstype = fstype
self.options = options
self.dump_code = dump_code
self.pass_code = pass_code
if not self.options:
self.options = "default"
def __str__(self):
return "{} {} {} {} {} {}".format(self.device, self.mountpoint,
self.fstype, self.options,
self.dump_code, self.pass_code)
def get_fields(self):
return [self.device, self.mountpoint, self.fstype, self.options,
self.dump_code, self.pass_code]
class FstabBuilder(object):
def __init__(self):
self.header = "# /etc/fstab: static file system information.\n" \
"#\n" \
"# Use 'blkid -o value -s UUID' to print the universally unique identifier\n" \
"# for a device; this may be used with UUID= as a more robust way to name\n" \
"# devices that works even if disks are added and removed. See fstab(5).\n" \
"#\n"
self.entries = []
def __str__(self):
# Group fields by columns an compute the max length of each column
# to obtain the needed tabulation.
res = self.header
field_matrix = [entry.get_fields() for entry in self.entries]
transposed = list(zip(*field_matrix))
col_widths = []
for col in transposed:
max_length_col = max([len(item) for item in col])
col_widths.append(max_length_col)
for row in field_matrix:
alligned_row = []
for i, item in enumerate(row):
formatted_item = f"{item:<{col_widths[i]}}"
alligned_row.append(formatted_item)
res += " ".join(alligned_row)
res += '\n'
return res
def load(self, file_path):
self.entries.clear()
try:
with open(file_path, 'r') as file:
for line in file:
line = line.strip()
if not line or line.startswith('#'):
continue
line = line.replace('\t', ' ')
fields = list(filter(None, line.split(' ')))
if len(fields) < 4 or len(fields) > 6:
raise OgError(f'Invalid line in {file_path}: {line}')
self.entries.append(FstabEntry(*fields))
except FileNotFoundError as e:
raise OgError(f"File {file_path} not found") from e
except IOError as e:
raise OgError(f"Could not read file {file_path}: {e}") from e
except Exception as e:
raise OgError(f"An unexpected error occurred: {e}") from e
def write(self, file_path):
with open(file_path, 'w') as file:
file.write(str(self))
def get_entry_by_fstype(self, fstype):
res = []
for entry in self.entries:
if entry.fstype == fstype:
res.append(entry)
return res
def get_entry_by_mountpoint(self, mountpoint):
for entry in self.entries:
if entry.mountpoint == mountpoint:
return entry
return None
def remove_entry(self, entry):
if entry in self.entries:
self.entries.remove(entry)
def add_entry(self, entry):
self.entries.append(entry)
def get_formatted_device(disk, partition):
uuid = get_filesystem_id(disk, partition)
if uuid:
return f'UUID={uuid}'
return get_partition_device(disk, partition)
def configure_root_partition(disk, partition, fstab):
root_device = get_formatted_device(disk, partition)
root_entry = fstab.get_entry_by_mountpoint('/')
if not root_entry:
raise OgError('Invalid fstab configuration: no root mountpoint defined')
root_entry.device = root_device
def configure_swap(disk, mountpoint, fstab):
swap_entries = fstab.get_entry_by_fstype('swap')
swap_entry = None
for entry in swap_entries:
if entry.device.startswith('/'):
old_swap_device_path = os.path.join(mountpoint, entry.device[1:])
is_swapfile = os.path.isfile(old_swap_device_path)
if is_swapfile:
continue
if swap_entry:
logging.warning(f'Removing device {entry.device} from fstab, only one swap partition is supported')
fstab.remove_entry(entry)
else:
swap_entry = entry
diskname = get_disks()[disk-1]
partitions = get_partition_data(device=f'/dev/{diskname}')
swap_device = ''
for pa in partitions:
if pa.fstype == 'swap':
swap_device = get_formatted_device(disk, pa.partno + 1)
break
if not swap_device:
if swap_entry:
fstab.remove_entry(swap_entry)
return
if swap_entry:
swap_entry.device = swap_device
return
swap_entry = FstabEntry(swap_device, 'none', 'swap', 'sw', '0', '0')
fstab.add_entry(swap_entry)
def configure_efi(disk, fstab):
if not is_uefi_supported():
return
efi_mnt_list = ['/boot/efi', '/efi']
for efi_mnt in efi_mnt_list:
efi_entry = fstab.get_entry_by_mountpoint(efi_mnt)
if efi_entry:
break
_, _, efi_partition = get_efi_partition(disk, enforce_gpt=False)
esp_device = get_formatted_device(disk, efi_partition)
if efi_entry:
efi_entry.device = esp_device
return
efi_entry = FstabEntry(esp_device, '/boot/efi', 'vfat', 'umask=0077,shortname=winnt', '0', '2')
fstab.add_entry(efi_entry)
def update_fstab(disk, partition, mountpoint):
fstab_path = os.path.join(mountpoint, 'etc/fstab')
fstab = FstabBuilder()
fstab.load(fstab_path)
configure_root_partition(disk, partition, fstab)
configure_swap(disk, mountpoint, fstab)
configure_efi(disk, fstab)
fstab.write(fstab_path)
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