Send patches - preferably formatted by git format-patch - to patches at archlinux32 dot org.
summaryrefslogtreecommitdiff
path: root/archinstall/lib/disk.py
blob: 30a7c44e6a071e81dd307fe857dffa7947864467 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
import glob, re, os, json
from collections import OrderedDict
from .exceptions import *
from .general import *

ROOT_DIR_PATTERN = re.compile('^.*?/devices')
GPT = 0b00000001

#import ctypes
#import ctypes.util
#libc = ctypes.CDLL(ctypes.util.find_library('c'), use_errno=True)
#libc.mount.argtypes = (ctypes.c_char_p, ctypes.c_char_p, ctypes.c_char_p, ctypes.c_ulong, ctypes.c_char_p)

class BlockDevice():
	def __init__(self, path, info):
		self.path = path
		self.info = info
		self.part_cache = OrderedDict()

	@property
	def device(self):
		"""
		Returns the actual device-endpoint of the BlockDevice.
		If it's a loop-back-device it returns the back-file,
		If it's a ATA-drive it returns the /dev/X device
		And if it's a crypto-device it returns the parent device
		"""
		if not 'type' in self.info: raise DiskError(f'Could not locate backplane info for "{self.path}"')

		if self.info['type'] == 'loop':
			for drive in json.loads(b''.join(sys_command(f'losetup --json', hide_from_log=True)).decode('UTF_8'))['loopdevices']:
				if not drive['name'] == self.path: continue

				return drive['back-file']
		elif self.info['type'] == 'disk':
			return self.path
		elif self.info['type'] == 'crypt':
			if not 'pkname' in self.info: raise DiskError(f'A crypt device ({self.path}) without a parent kernel device name.')
			return f"/dev/{self.info['pkname']}"

	#	if not stat.S_ISBLK(os.stat(full_path).st_mode):
	#		raise DiskError(f'Selected disk "{full_path}" is not a block device.')

	@property
	def partitions(self):
		o = b''.join(sys_command(f'partprobe {self.path}'))

		#o = b''.join(sys_command('/usr/bin/lsblk -o name -J -b {dev}'.format(dev=dev)))
		o = b''.join(sys_command(f'/usr/bin/lsblk -J {self.path}'))
		if b'not a block device' in o:
			raise DiskError(f'Can not read partitions off something that isn\'t a block device: {self.path}')

		if not o[:1] == b'{':
			raise DiskError(f'Error getting JSON output from:', f'/usr/bin/lsblk -J {self.path}')

		r = json.loads(o.decode('UTF-8'))
		if len(r['blockdevices']) and 'children' in r['blockdevices'][0]:
			root_path = f"/dev/{r['blockdevices'][0]['name']}"
			for part in r['blockdevices'][0]['children']:
				part_id = part['name'][len(os.path.basename(self.path)):]
				if part_id not in self.part_cache:
					## TODO: Force over-write even if in cache?
					self.part_cache[part_id] = Partition(root_path + part_id, part_id=part_id, size=part['size'])

		return {k: self.part_cache[k] for k in sorted(self.part_cache)}

	@property
	def partition(self):
		all_partitions = self.partitions
		return [all_partitions[k] for k in all_partitions]

	def __repr__(self, *args, **kwargs):
		return f"BlockDevice({self.device})"

	def __getitem__(self, key, *args, **kwargs):
		if not key in self.info:
			raise KeyError(f'{self} does not contain information: "{key}"')
		return self.info[key]

class Partition():
	def __init__(self, path, part_id=None, size=-1, filesystem=None, mountpoint=None):
		if not part_id: part_id = os.path.basename(path)
		self.path = path
		self.part_id = part_id
		self.mountpoint = mountpoint
		self.filesystem = filesystem # TODO: Autodetect if we're reusing a partition
		self.size = size # TODO: Refresh?

	def __repr__(self, *args, **kwargs):
		return f'Partition({self.path}, fs={self.filesystem}, mounted={self.mountpoint})'

	def format(self, filesystem):
		log(f'Formatting {self} -> {filesystem}')
		if filesystem == 'btrfs':
			o = b''.join(sys_command(f'/usr/bin/mkfs.btrfs -f {self.path}'))
			if not b'UUID' in o:
				raise DiskError(f'Could not format {self.path} with {filesystem} because: {o}')
			self.filesystem = 'btrfs'
		elif filesystem == 'fat32':
			o = b''.join(sys_command(f'/usr/bin/mkfs.vfat -F32 {self.path}'))
			if (b'mkfs.fat' not in o and b'mkfs.vfat' not in o) or b'command not found' in o:
				raise DiskError(f'Could not format {self.path} with {filesystem} because: {o}')
			self.filesystem = 'fat32'
		elif filesystem == 'ext4':
			if (handle := sys_command(f'/usr/bin/mkfs.ext4 -F {self.path}')).exit_code != 0:
				raise DiskError(f'Could not format {self.path} with {filesystem} because: {b"".join(handle)}')
			self.filesystem = 'fat32'
		else:
			raise DiskError(f'Fileformat {filesystem} is not yet implemented.')
		return True

	def mount(self, target, fs=None, options=''):
		if not self.mountpoint:
			log(f'Mounting {self} to {target}')
			if not fs:
				if not self.filesystem: raise DiskError(f'Need to format (or define) the filesystem on {self} before mounting.')
				fs = self.filesystem
			## libc has some issues with loop devices, defaulting back to sys calls
		#	ret = libc.mount(self.path.encode(), target.encode(), fs.encode(), 0, options.encode())
		#	if ret < 0:
		#		errno = ctypes.get_errno()
		#		raise OSError(errno, f"Error mounting {self.path} ({fs}) on {target} with options '{options}': {os.strerror(errno)}")
			if sys_command(f'/usr/bin/mount {self.path} {target}').exit_code == 0:
				self.mountpoint = target
				return True
		
class Filesystem():
	# TODO:
	#   When instance of a HDD is selected, check all usages and gracefully unmount them
	#   as well as close any crypto handles.
	def __init__(self, blockdevice, mode=GPT):
		self.blockdevice = blockdevice
		self.mode = mode

	def __enter__(self, *args, **kwargs):
		if self.mode == GPT:
			if sys_command(f'/usr/bin/parted -s {self.blockdevice.device} mklabel gpt',).exit_code == 0:
				return self
			else:
				raise DiskError(f'Problem setting the partition format to GPT:', f'/usr/bin/parted -s {self.blockdevice.device} mklabel gpt')
		else:
			raise DiskError(f'Unknown mode selected to format in: {self.mode}')

	def __exit__(self, *args, **kwargs):
		# TODO: https://stackoverflow.com/questions/28157929/how-to-safely-handle-an-exception-inside-a-context-manager
		if len(args) >= 2 and args[1]:
			raise args[1]
		b''.join(sys_command(f'sync'))
		return True

	def raw_parted(self, string:str):
		x = sys_command(f'/usr/bin/parted -s {string}')
		o = b''.join(x)
		return x

	def parted(self, string:str):
		"""
		Performs a parted execution of the given string

		:param string: A raw string passed to /usr/bin/parted -s <string>
		:type string: str
		"""
		return self.raw_parted(string).exit_code

	def use_entire_disk(self, prep_mode=None):
		self.add_partition('primary', start='1MiB', end='513MiB', format='fat32')
		self.set_name(0, 'EFI')
		self.set(0, 'boot on')
		self.set(0, 'esp on') # TODO: Redundant, as in GPT mode it's an alias for "boot on"? https://www.gnu.org/software/parted/manual/html_node/set.html
		if prep_mode == 'luks2':
			self.add_partition('primary', start='513MiB', end='100%')
		else:
			self.add_partition('primary', start='513MiB', end='100%', format='ext4')

	def add_partition(self, type, start, end, format=None):
		log(f'Adding partition to {self.blockdevice}')
		if format:
			return self.parted(f'{self.blockdevice.device} mkpart {type} {format} {start} {end}') == 0
		else:
			return self.parted(f'{self.blockdevice.device} mkpart {type} {start} {end}') == 0

	def set_name(self, partition:int, name:str):
		return self.parted(f'{self.blockdevice.device} name {partition+1} "{name}"') == 0

	def set(self, partition:int, string:str):
		return self.parted(f'{self.blockdevice.device} set {partition+1} {string}') == 0

def device_state(name, *args, **kwargs):
	# Based out of: https://askubuntu.com/questions/528690/how-to-get-list-of-all-non-removable-disk-device-names-ssd-hdd-and-sata-ide-onl/528709#528709
	if os.path.isfile('/sys/block/{}/device/block/{}/removable'.format(name, name)):
		with open('/sys/block/{}/device/block/{}/removable'.format(name, name)) as f:
			if f.read(1) == '1':
				return

	path = ROOT_DIR_PATTERN.sub('', os.readlink('/sys/block/{}'.format(name)))
	hotplug_buses = ("usb", "ieee1394", "mmc", "pcmcia", "firewire")
	for bus in hotplug_buses:
		if os.path.exists('/sys/bus/{}'.format(bus)):
			for device_bus in os.listdir('/sys/bus/{}/devices'.format(bus)):
				device_link = ROOT_DIR_PATTERN.sub('', os.readlink('/sys/bus/{}/devices/{}'.format(bus, device_bus)))
				if re.search(device_link, path):
					return
	return True

# lsblk --json -l -n -o path
def all_disks(*args, **kwargs):
	if not 'partitions' in kwargs: kwargs['partitions'] = False
	drives = OrderedDict()
	#for drive in json.loads(sys_command(f'losetup --json', *args, **lkwargs, hide_from_log=True)).decode('UTF_8')['loopdevices']:
	for drive in json.loads(b''.join(sys_command(f'lsblk --json -l -n -o path,size,type,mountpoint,label,pkname', *args, **kwargs, hide_from_log=True)).decode('UTF_8'))['blockdevices']:
		if not kwargs['partitions'] and drive['type'] == 'part': continue

		drives[drive['path']] = BlockDevice(drive['path'], drive)
	return drives