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from __future__ import annotations
import logging
from typing import Optional, Dict, Any, List, TYPE_CHECKING
# https://stackoverflow.com/a/39757388/929999
from ..models.subvolume import Subvolume
if TYPE_CHECKING:
from .blockdevice import BlockDevice
_: Any
from .helpers import sort_block_devices_based_on_performance, select_largest_device, select_disk_larger_than_or_close_to
from ..hardware import has_uefi
from ..output import log
from ..menu import Menu
def suggest_single_disk_layout(block_device :BlockDevice,
default_filesystem :Optional[str] = None,
advanced_options :bool = False) -> Dict[str, Any]:
if not default_filesystem:
from ..user_interaction import ask_for_main_filesystem_format
default_filesystem = ask_for_main_filesystem_format(advanced_options)
MIN_SIZE_TO_ALLOW_HOME_PART = 40 # GiB
using_subvolumes = False
using_home_partition = False
compression = False
if default_filesystem == 'btrfs':
prompt = str(_('Would you like to use BTRFS subvolumes with a default structure?'))
choice = Menu(prompt, Menu.yes_no(), skip=False, default_option=Menu.yes()).run()
using_subvolumes = choice.value == Menu.yes()
prompt = str(_('Would you like to use BTRFS compression?'))
choice = Menu(prompt, Menu.yes_no(), skip=False, default_option=Menu.yes()).run()
compression = choice.value == Menu.yes()
layout = {
block_device.path : {
"wipe" : True,
"partitions" : []
}
}
# Used for reference: https://wiki.archlinux.org/title/partitioning
# 2 MiB is unallocated for GRUB on BIOS. Potentially unneeded for
# other bootloaders?
# TODO: On BIOS, /boot partition is only needed if the drive will
# be encrypted, otherwise it is not recommended. We should probably
# add a check for whether the drive will be encrypted or not.
layout[block_device.path]['partitions'].append({
# Boot
"type" : "primary",
"start" : "3MiB",
"size" : "203MiB",
"boot" : True,
"encrypted" : False,
"wipe" : True,
"mountpoint" : "/boot",
"filesystem" : {
"format" : "fat32"
}
})
# Increase the UEFI partition if UEFI is detected.
# Also re-align the start to 1MiB since we don't need the first sectors
# like we do in MBR layouts where the boot loader is installed traditionally.
if has_uefi():
layout[block_device.path]['partitions'][-1]['start'] = '1MiB'
layout[block_device.path]['partitions'][-1]['size'] = '512MiB'
layout[block_device.path]['partitions'].append({
# Root
"type" : "primary",
"start" : "206MiB",
"encrypted" : False,
"wipe" : True,
"mountpoint" : "/" if not using_subvolumes else None,
"filesystem" : {
"format" : default_filesystem,
"mount_options" : ["compress=zstd"] if compression else []
}
})
if has_uefi():
layout[block_device.path]['partitions'][-1]['start'] = '513MiB'
if not using_subvolumes and block_device.size >= MIN_SIZE_TO_ALLOW_HOME_PART:
prompt = str(_('Would you like to create a separate partition for /home?'))
choice = Menu(prompt, Menu.yes_no(), skip=False, default_option=Menu.yes()).run()
using_home_partition = choice.value == Menu.yes()
# Set a size for / (/root)
if using_subvolumes or block_device.size < MIN_SIZE_TO_ALLOW_HOME_PART or not using_home_partition:
# We'll use subvolumes
# Or the disk size is too small to allow for a separate /home
# Or the user doesn't want to create a separate partition for /home
layout[block_device.path]['partitions'][-1]['size'] = '100%'
else:
layout[block_device.path]['partitions'][-1]['size'] = f"{min(block_device.size, 20)}GiB"
if default_filesystem == 'btrfs' and using_subvolumes:
# if input('Do you want to use a recommended structure? (Y/n): ').strip().lower() in ('', 'y', 'yes'):
# https://btrfs.wiki.kernel.org/index.php/FAQ
# https://unix.stackexchange.com/questions/246976/btrfs-subvolume-uuid-clash
# https://github.com/classy-giraffe/easy-arch/blob/main/easy-arch.sh
layout[block_device.path]['partitions'][1]['btrfs'] = {
'subvolumes': [
Subvolume('@', '/'),
Subvolume('@home', '/home'),
Subvolume('@log', '/var/log'),
Subvolume('@pkg', '/var/cache/pacman/pkg'),
Subvolume('@.snapshots', '/.snapshots')
]
}
elif using_home_partition:
# If we don't want to use subvolumes,
# But we want to be able to re-use data between re-installs..
# A second partition for /home would be nice if we have the space for it
layout[block_device.path]['partitions'].append({
# Home
"type" : "primary",
"start" : f"{min(block_device.size, 20)}GiB",
"size" : "100%",
"encrypted" : False,
"wipe" : True,
"mountpoint" : "/home",
"filesystem" : {
"format" : default_filesystem,
"mount_options" : ["compress=zstd"] if compression else []
}
})
return layout
def suggest_multi_disk_layout(block_devices :List[BlockDevice], default_filesystem :Optional[str] = None, advanced_options :bool = False):
if not default_filesystem:
from ..user_interaction import ask_for_main_filesystem_format
default_filesystem = ask_for_main_filesystem_format(advanced_options)
# Not really a rock solid foundation of information to stand on, but it's a start:
# https://www.reddit.com/r/btrfs/comments/m287gp/partition_strategy_for_two_physical_disks/
# https://www.reddit.com/r/btrfs/comments/9us4hr/what_is_your_btrfs_partitionsubvolumes_scheme/
MIN_SIZE_TO_ALLOW_HOME_PART = 40 # GiB
ARCH_LINUX_INSTALLED_SIZE = 20 # GiB, rough estimate taking in to account user desktops etc. TODO: Catch user packages to detect size?
block_devices = sort_block_devices_based_on_performance(block_devices).keys()
home_device = select_largest_device(block_devices, gigabytes=MIN_SIZE_TO_ALLOW_HOME_PART)
root_device = select_disk_larger_than_or_close_to(block_devices, gigabytes=ARCH_LINUX_INSTALLED_SIZE, filter_out=[home_device])
if home_device is None or root_device is None:
text = _('The selected drives do not have the minimum capacity required for an automatic suggestion\n')
text += _('Minimum capacity for /home partition: {}GB\n').format(MIN_SIZE_TO_ALLOW_HOME_PART)
text += _('Minimum capacity for Arch Linux partition: {}GB').format(ARCH_LINUX_INSTALLED_SIZE)
Menu(str(text), [str(_('Continue'))], skip=False).run()
return None
compression = False
if default_filesystem == 'btrfs':
# prompt = 'Would you like to use BTRFS subvolumes with a default structure?'
# choice = Menu(prompt, ['yes', 'no'], skip=False, default_option='yes').run()
# using_subvolumes = choice == 'yes'
prompt = str(_('Would you like to use BTRFS compression?'))
choice = Menu(prompt, Menu.yes_no(), skip=False, default_option=Menu.yes()).run()
compression = choice.value == Menu.yes()
log(f"Suggesting multi-disk-layout using {len(block_devices)} disks, where {root_device} will be /root and {home_device} will be /home", level=logging.DEBUG)
layout = {
root_device.path : {
"wipe" : True,
"partitions" : []
},
home_device.path : {
"wipe" : True,
"partitions" : []
},
}
# TODO: Same deal as with the single disk layout, we should
# probably check if the drive will be encrypted.
layout[root_device.path]['partitions'].append({
# Boot
"type" : "primary",
"start" : "3MiB",
"size" : "203MiB",
"boot" : True,
"encrypted" : False,
"wipe" : True,
"mountpoint" : "/boot",
"filesystem" : {
"format" : "fat32"
}
})
if has_uefi():
layout[root_device.path]['partitions'][-1]['start'] = '1MiB'
layout[root_device.path]['partitions'][-1]['size'] = '512MiB'
layout[root_device.path]['partitions'].append({
# Root
"type" : "primary",
"start" : "206MiB",
"size" : "100%",
"encrypted" : False,
"wipe" : True,
"mountpoint" : "/",
"filesystem" : {
"format" : default_filesystem,
"mount_options" : ["compress=zstd"] if compression else []
}
})
if has_uefi():
layout[root_device.path]['partitions'][-1]['start'] = '513MiB'
layout[home_device.path]['partitions'].append({
# Home
"type" : "primary",
"start" : "1MiB",
"size" : "100%",
"encrypted" : False,
"wipe" : True,
"mountpoint" : "/home",
"filesystem" : {
"format" : default_filesystem,
"mount_options" : ["compress=zstd"] if compression else []
}
})
return layout
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