433 lines
21 KiB
Python
433 lines
21 KiB
Python
#!/usr/bin/env python3
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"""Preview and deploy a separate amd64 UEFI Limine or GRUB installation."""
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import argparse
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import hashlib
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import json
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import os
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import platform
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import re
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import shlex
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import shutil
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import subprocess
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import sys
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from datetime import datetime, timezone
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from pathlib import Path
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STATE = Path('/etc/fiw-gentoo-dots/boot.json')
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MANAGED = Path('/var/lib/Fiw-Gentoo-Dots')
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BEGIN = '# >>> Fiw-Gentoo-Dots kernels'
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END = '# <<< Fiw-Gentoo-Dots kernels'
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EFI_DIRECTORY = 'EFI/Fiw-Gentoo'
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GRUB_DIRECTORY = Path('/boot/fiw-gentoo')
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def mount_info(path, exact=False):
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result = subprocess.run(['findmnt', '--json', '--mountpoint' if exact else '--target',
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str(path), '--output', 'TARGET,SOURCE,FSTYPE,UUID,OPTIONS'],
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text=True, capture_output=True)
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if result.returncode:
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raise RuntimeError('Not a mounted filesystem: ' + str(path))
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data = json.loads(result.stdout)['filesystems'][0]
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return data
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def discover_esp(path=None):
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candidates = [Path(path)] if path else [Path('/efi'), Path('/boot/efi'), Path('/boot')]
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for candidate in candidates:
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try:
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info = mount_info(candidate, exact=True)
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except RuntimeError:
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continue
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if info['fstype'] not in ('vfat', 'fat', 'fat32'):
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continue
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source = re.sub(r'\[.*\]$', '', info['source'])
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device = Path(source).resolve()
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partition = Path('/sys/class/block') / device.name / 'partition'
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if not partition.is_file():
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continue
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# Require the GPT ESP type, not an arbitrary mounted FAT data partition.
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result = subprocess.run(['lsblk', '--noheadings', '--nodeps', '--output', 'PARTTYPE', str(device)],
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text=True, capture_output=True)
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esp_type = 'c12a7328f81f11d2ba4b00a0c93ec93b' # GPT ESP type, without separators
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if result.returncode or result.stdout.strip().lower().replace('-', '') != esp_type:
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continue
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parent = (Path('/sys/class/block') / device.name).resolve().parent.name
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identifier = subprocess.run(['lsblk', '--noheadings', '--nodeps', '--output', 'PARTUUID', str(device)], text=True, capture_output=True)
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return {'partuuid': identifier.stdout.strip().lower(), 'path': str(candidate.resolve()), 'device': str(device),
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'disk': '/dev/' + parent, 'partition': int(partition.read_text())}
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raise RuntimeError('Select a mounted GPT EFI System Partition with --esp. No ESP was found.')
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def kernel_images(boot=Path('/boot'), exclude=None):
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found = {}
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for pattern, prefix in [('vmlinuz-*', 'vmlinuz-'), ('kernel-*', 'kernel-')]:
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for path in boot.glob(pattern):
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version = path.name[len(prefix):]
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if path.is_file() and re.fullmatch(r'[A-Za-z0-9_.+-]+', version) and version != exclude:
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initrds = [boot / ('initramfs-' + version + '.img'), boot / ('initrd-' + version),
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boot / ('initrd.img-' + version)]
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found.setdefault(version, {'version': version, 'kernel': str(path),
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'initrd': next((str(p) for p in initrds if p.is_file()), None)})
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# systemd BLS installations store a linux/initrd pair below their entry ID.
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for path in boot.glob('*/*/linux'):
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version = path.parent.name
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if path.is_file() and re.fullmatch(r'[A-Za-z0-9_.+-]+', version) and version != exclude:
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initrd = path.parent / 'initrd'
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found.setdefault(version, {'version': version, 'kernel': str(path),
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'initrd': str(initrd) if initrd.is_file() else None})
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for path in Path('/usr/lib/modules').glob('*/vmlinuz'):
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version = path.parent.name
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if boot == Path('/boot') and path.is_file() and version != exclude and re.fullmatch(r'[A-Za-z0-9_.+-]+', version):
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initrd = boot / ('initramfs-' + version + '.img')
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found.setdefault(version, {'version': version, 'kernel': str(path),
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'initrd': str(initrd) if initrd.is_file() else None})
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versions = subprocess.run(['sort', '-V'], input='\n'.join(found), text=True,
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capture_output=True, check=True).stdout.splitlines()[::-1]
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versions.sort(key=lambda v: not any(word in v.lower() for word in ('fiw', 'cachy')))
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return [found[v] for v in versions]
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def kernel_cmdline(root):
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config = Path('/etc/kernel/cmdline')
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raw = config.read_text().strip() if config.is_file() else Path('/proc/cmdline').read_text().strip()
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tokens = shlex.split(raw)
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tokens = [token for token in tokens if not token.startswith(('BOOT_IMAGE=', 'initrd=', 'root='))]
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if not root.get('uuid'):
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raise RuntimeError('Cannot identify the target root filesystem UUID.')
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tokens.insert(0, 'root=UUID=' + root['uuid'])
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if root['fstype'] == 'btrfs' and not any(t.startswith('rootflags=') for t in tokens):
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flags = [flag for flag in root.get('options', '').split(',') if flag.startswith('subvol=')]
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if flags:
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tokens.append('rootflags=' + flags[0])
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text = ' '.join(tokens)
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if any(char in text for char in ('\n', '\r', '\0')):
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raise RuntimeError('Invalid kernel command line.')
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return text
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def secure_boot():
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files = list(Path('/sys/firmware/efi/efivars').glob('SecureBoot-*'))
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return bool(files and len(files[0].read_bytes()) > 4 and files[0].read_bytes()[4] == 1)
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def limine_loader():
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for path in [Path('/usr/share/limine/BOOTX64.EFI'), Path('/usr/share/limine/limine-uefi-cd.bin')]:
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# A CD image is not an EFI executable; only actual PE EFI files qualify.
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if path.is_file() and path.open('rb').read(2) == b'MZ':
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return path
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for path in Path('/usr/share/limine').rglob('BOOTX64.EFI'):
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if path.is_file():
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return path
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raise RuntimeError('Limine BOOTX64.EFI is missing; install sys-boot/limine with uefi-x86-64.')
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def render_limine(images, cmdline):
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lines = [BEGIN]
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for image in images:
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version = image['version']
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label = 'custom' if any(word in version.lower() for word in ('fiw', 'cachy')) else 'generic'
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lines += [f'/Gentoo {version} ({label})', ' protocol: linux',
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f' path: boot():/{EFI_DIRECTORY}/kernels/{version}/vmlinuz',
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f' module_path: boot():/{EFI_DIRECTORY}/kernels/{version}/initramfs.img',
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' cmdline: ' + cmdline, '']
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return '\n'.join(lines + [END]) + '\n'
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def managed_block(text):
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if text.count(BEGIN) != text.count(END) or text.count(BEGIN) > 1:
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raise RuntimeError('Malformed managed Limine block; preserving the config.')
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if BEGIN not in text:
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return None
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start = text.index(BEGIN)
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end = text.index(END, start) + len(END)
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return text[start:end] + '\n'
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def merge_limine(text, block):
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old = managed_block(text)
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if old is None:
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return text.rstrip() + '\n\n' + block if text.strip() else 'timeout: 5\n\n' + block
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return text.replace(old.rstrip('\n'), block.rstrip('\n'), 1)
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def file_hash(path):
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return hashlib.sha256(path.read_bytes()).hexdigest() if path.is_file() else None
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def block_hash(block):
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return hashlib.sha256(block.encode()).hexdigest() if block else None
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def install_config(old):
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values = {'layout': 'compat', 'initrd_generator': 'dracut', 'uki_generator': 'none'}
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lines, seen = [], set()
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for line in old.splitlines():
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key = line.split('=', 1)[0].strip()
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if key in values:
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if key not in seen:
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lines.append(key + '=' + values[key])
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seen.add(key)
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else:
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lines.append(line)
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lines += [key + '=' + value for key, value in values.items() if key not in seen]
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return '\n'.join(lines) + '\n'
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def plan(mode, esp=None, exclude=None):
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if mode == 'keep':
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return {'mode': 'keep', 'changes': []}
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if mode not in ('limine', 'grub'):
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raise ValueError('Unknown bootloader')
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if platform.machine() not in ('x86_64', 'amd64') or not Path('/sys/firmware/efi').is_dir():
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raise RuntimeError('Automatic boot deployment supports amd64 UEFI installations.')
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root = mount_info('/')
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if root['fstype'] not in ('ext4', 'btrfs') or root['source'].startswith('/dev/mapper/'):
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raise RuntimeError('Automatic boot deployment currently supports plain ext4/Btrfs roots. Keep the existing loader for encrypted or other layouts.')
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source = re.sub(r'\[.*\]$', '', root['source'])
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device_type = subprocess.run(['lsblk', '--noheadings', '--nodeps', '--output', 'TYPE', source], text=True, capture_output=True)
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if device_type.returncode or device_type.stdout.strip() not in ('part', 'disk'):
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raise RuntimeError('Automatic boot deployment needs a plain disk/partition root; keep the existing loader for this storage layout.')
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target = discover_esp(esp)
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images = kernel_images(exclude=exclude)
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if not images:
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raise RuntimeError('No installed kernel/initramfs candidates found under /boot. Install a distribution kernel first.')
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text = kernel_cmdline(root)
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result = {'mode': mode, 'esp': target, 'root_filesystem': root['fstype'],
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'cmdline': text, 'images': images, 'secure_boot': secure_boot(),
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'firmware': 'preserve current entries/order unless explicitly selected',
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'kernel_refresh_hook': '/etc/kernel/install.d/96-fiw-dots-boot.install'}
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if mode == 'limine':
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result['loader'] = str(limine_loader())
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result['config'] = str(Path(target['path']) / EFI_DIRECTORY / 'limine.conf')
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result['proposed_entries'] = render_limine(images, text)
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else:
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result['config'] = str(GRUB_DIRECTORY / 'grub/grub.cfg')
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result['commands'] = [['grub-install', '--target=x86_64-efi', '--efi-directory=' + target['path'],
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'--boot-directory=' + str(GRUB_DIRECTORY), '--bootloader-id=Fiw-Gentoo', '--no-nvram'],
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['grub-mkconfig', '-o', result['config']]]
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prior = Path('/etc/kernel/install.conf').read_text() if Path('/etc/kernel/install.conf').is_file() else ''
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result['installkernel_config'] = install_config(prior)
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for image in images:
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if not image['initrd']:
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image['generate_initrd'] = '/boot/initramfs-' + image['version'] + '.img'
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return result
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def backup(path, root):
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if path.exists() or path.is_symlink():
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target = root / str(path.absolute()).lstrip('/')
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target.parent.mkdir(parents=True, exist_ok=True)
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shutil.copy2(path, target, follow_symlinks=False)
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def write(path, content, backups, mode=0o644):
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backup(path, backups)
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path.parent.mkdir(parents=True, exist_ok=True)
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tmp = path.with_name('.' + path.name + '.fiw-dots-tmp')
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tmp.write_text(content)
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tmp.chmod(mode)
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tmp.replace(path)
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def refresh(saved, backups, exclude=None):
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# Recheck the mount every time; never write into an unmounted ESP directory.
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target = discover_esp(Path(saved['esp']))
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images = kernel_images(exclude=exclude)
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if not images:
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raise RuntimeError('No remaining kernels; preserving the boot menu.')
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for image in images:
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if not image['initrd']:
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if not shutil.which('dracut'):
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raise RuntimeError('Missing initramfs for ' + image['version'] + '; install sys-kernel/dracut.')
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path = Path('/boot/initramfs-' + image['version'] + '.img')
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subprocess.run(['dracut', '--force', str(path), image['version']], check=True)
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image['initrd'] = str(path)
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if saved['mode'] == 'grub':
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config = GRUB_DIRECTORY / 'grub/grub.cfg'
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old_hash = file_hash(config)
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output = config
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if old_hash and old_hash != saved.get('config_hash'):
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output = config.with_name(config.name + '.new.' + datetime.now(timezone.utc).strftime('%Y%m%dT%H%M%S.%fZ'))
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else:
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backup(config, backups)
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output.parent.mkdir(parents=True, exist_ok=True)
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for image in images:
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source = Path(image['kernel'])
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if source.parent != Path('/boot'):
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dest = Path('/boot') / ('kernel-' + image['version'])
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if file_hash(dest) != file_hash(source):
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backup(dest, backups)
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shutil.copy2(source, dest)
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source = Path(image['initrd'])
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dest = Path('/boot') / ('initramfs-' + image['version'] + '.img')
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if source != dest and not dest.exists():
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shutil.copy2(source, dest)
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scratch = output.with_name('.' + output.name + '.tmp')
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try:
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subprocess.run(['grub-mkconfig', '-o', str(scratch)], check=True)
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scratch.replace(output)
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finally:
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if scratch.exists():
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scratch.unlink()
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if output != config:
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print('Preserved edited GRUB config; review ' + str(output))
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else:
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saved['config_hash'] = file_hash(config)
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return saved
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folder = Path(target['path']) / EFI_DIRECTORY
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required = sum(Path(source).stat().st_size for image in images
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for source, name in [(image['kernel'], 'vmlinuz'), (image['initrd'], 'initramfs.img')]
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if file_hash(folder / 'kernels' / image['version'] / name) != file_hash(Path(source)))
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if shutil.disk_usage(target['path']).free < required + 16 * 1024 * 1024:
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raise RuntimeError('Not enough free space on the ESP for the selected kernels and initramfs files.')
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for image in images:
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directory = folder / 'kernels' / image['version']
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directory.mkdir(parents=True, exist_ok=True)
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for source, name in [(image['kernel'], 'vmlinuz'), (image['initrd'], 'initramfs.img')]:
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dest = directory / name
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if file_hash(dest) != file_hash(Path(source)):
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backup(dest, backups)
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scratch = dest.with_name('.' + name + '.tmp')
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shutil.copy2(source, scratch)
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scratch.replace(dest)
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config = folder / 'limine.conf'
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old = config.read_text() if config.is_file() else ''
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prior = managed_block(old)
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block = render_limine(images, saved['cmdline'])
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output = merge_limine(old, block)
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if prior and block_hash(prior) != saved.get('block_hash'):
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proposal = config.with_name(config.name + '.new.' + datetime.now(timezone.utc).strftime('%Y%m%dT%H%M%S.%fZ'))
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write(proposal, output, backups)
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print('Preserved edited Limine entries; review ' + str(proposal))
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elif output != old:
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write(config, output, backups)
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saved['block_hash'] = block_hash(block)
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return saved
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def confirm(prompt, choices, default):
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if not sys.stdin.isatty():
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raise RuntimeError('Interactive confirmation required: ' + prompt)
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while True:
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value = input(prompt + ' [' + '/'.join(choices) + '] (default ' + default + '): ').strip().lower() or default
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if value in choices:
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return value
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def firmware_commands(target, mode, loader_path, choice, listing):
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if choice == 'keep':
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return []
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label = 'Fiw-Gentoo-' + mode
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matches = []
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for line in listing.splitlines():
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match = re.match(r'^Boot([0-9A-Fa-f]{4})\*?\s+' + re.escape(label) + r'\s', line)
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if match and target.get('partuuid') and target['partuuid'] in line.lower() and loader_path.lower().replace('/', '\\') in line.lower():
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matches.append(match.group(1))
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if matches:
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if choice == 'add':
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return []
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order = re.search(r'^BootOrder:\s*(.*)$', listing, re.M)
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sequence = [matches[0]] + [item for item in (order.group(1).split(',') if order else [])
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if item.upper() != matches[0].upper()]
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return [['efibootmgr', '--bootorder', ','.join(sequence)]]
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return [['efibootmgr', '--create' if choice == 'default' else '--create-only',
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'--disk', target['disk'], '--part', str(target['partition']),
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'--label', label, '--loader', loader_path.replace('/', '\\')]]
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def deploy(mode, esp=None, ask=confirm):
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if mode == 'keep':
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print('Keeping the current bootloader.')
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return {'status': 'skipped'}
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if os.geteuid() != 0:
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raise RuntimeError('Boot deployment needs root. Run sudo ./install --deploy-bootloader --selection <file>.')
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proposed = plan(mode, esp)
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if proposed['secure_boot']:
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raise RuntimeError('Secure Boot is active. This unsigned deployment requires a separately configured signing setup.')
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for command in (['grub-install', 'grub-mkconfig'] if mode == 'grub' else []):
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if not shutil.which(command):
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raise RuntimeError('Missing command: ' + command)
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if any(not image['initrd'] for image in proposed['images']) and not shutil.which('dracut'):
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raise RuntimeError('Missing initramfs generator: dracut')
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print(json.dumps(proposed, indent=2))
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firmware = ask('UEFI entry: preserve current order, add a menu entry, or make this loader default?',
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['keep', 'add', 'default'], 'keep')
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if firmware != 'keep' and not shutil.which('efibootmgr'):
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raise RuntimeError('Install sys-boot/efibootmgr before registering a firmware entry.')
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loader_path = '/EFI/Fiw-Gentoo/' + ('BOOTX64.EFI' if mode == 'limine' else 'grubx64.efi')
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listing = subprocess.run(['efibootmgr', '--verbose'], text=True, capture_output=True, check=True).stdout if firmware != 'keep' else ''
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commands = firmware_commands(proposed['esp'], mode, loader_path, firmware, listing)
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if commands:
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print('Proposed firmware commands: ' + json.dumps(commands))
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if ask('Deploy the previewed bootloader and kernel refresh hook?', ['deploy', 'cancel'], 'cancel') != 'deploy':
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return {'status': 'cancelled'}
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stamp = datetime.now(timezone.utc).strftime('%Y%m%dT%H%M%S.%fZ')
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backups = MANAGED / 'backups' / ('boot-' + stamp)
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folder = Path(proposed['esp']['path']) / EFI_DIRECTORY
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if folder.exists():
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shutil.copytree(folder, backups / 'efi-directory', symlinks=True)
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if GRUB_DIRECTORY.exists() and mode == 'grub':
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shutil.copytree(GRUB_DIRECTORY, backups / 'grub-directory', symlinks=True)
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prior = json.loads(STATE.read_text()) if STATE.is_file() else {}
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saved = {'mode': mode, 'esp': proposed['esp']['path'], 'cmdline': proposed['cmdline']}
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if prior.get('mode') == mode and prior.get('esp') == saved['esp']:
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saved.update({key: prior[key] for key in ('config_hash', 'block_hash') if key in prior})
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folder.mkdir(parents=True, exist_ok=True)
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if mode == 'limine':
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loader = folder / 'BOOTX64.EFI'
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backup(loader, backups)
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shutil.copy2(proposed['loader'], loader)
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loader_path = '/EFI/Fiw-Gentoo/BOOTX64.EFI'
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else:
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subprocess.run(proposed['commands'][0], check=True)
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loader_path = '/EFI/Fiw-Gentoo/grubx64.efi'
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saved = refresh(saved, backups)
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# Native installkernel provides versioned /boot kernel/initrd files; our
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# final hook refreshes only the chosen loader's own configuration.
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write(Path('/etc/kernel/install.conf'), proposed['installkernel_config'], backups)
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script = Path('/usr/local/libexec/fiw-dots-boot')
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backup(script, backups)
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script.parent.mkdir(parents=True, exist_ok=True)
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shutil.copy2(Path(__file__), script)
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script.chmod(0o755)
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hook = '#!/bin/sh\ncase "$1" in\n add) exec /usr/local/libexec/fiw-dots-boot --refresh ;;\n remove) exec /usr/local/libexec/fiw-dots-boot --refresh --exclude-version "$2" ;;\nesac\n'
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write(Path('/etc/kernel/install.d/96-fiw-dots-boot.install'), hook, backups, 0o755)
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# Traditional Gentoo installkernel uses postinst.d rather than install.d.
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|
legacy = '#!/bin/sh\nexec /usr/local/libexec/fiw-dots-boot --refresh\n'
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write(Path('/etc/kernel/postinst.d/96-fiw-dots-boot'), legacy, backups, 0o755)
|
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write(STATE, json.dumps(saved, indent=2) + '\n', backups, 0o600)
|
|
for command in commands:
|
|
subprocess.run(command, check=True)
|
|
report = MANAGED / ('boot-' + stamp + '.json')
|
|
report.parent.mkdir(parents=True, exist_ok=True)
|
|
report.write_text(json.dumps({'plan': proposed, 'firmware_choice': firmware,
|
|
'backups': str(backups)}, indent=2) + '\n')
|
|
print('Boot deployment finished. Report: ' + str(report))
|
|
return {'status': 'completed', 'mode': mode, 'firmware_choice': firmware,
|
|
'report': str(report), 'backups': str(backups)}
|
|
|
|
|
|
def main():
|
|
parser = argparse.ArgumentParser(description=__doc__)
|
|
parser.add_argument('--refresh', action='store_true')
|
|
parser.add_argument('--exclude-version')
|
|
args = parser.parse_args()
|
|
if not args.refresh:
|
|
parser.error('Use ./install --boot-plan or --deploy-bootloader for initial setup.')
|
|
if os.geteuid() != 0:
|
|
raise RuntimeError('Kernel refresh requires root.')
|
|
if not STATE.is_file():
|
|
return
|
|
saved = json.loads(STATE.read_text())
|
|
stamp = datetime.now(timezone.utc).strftime('%Y%m%dT%H%M%S.%fZ')
|
|
backups = MANAGED / 'backups' / ('boot-refresh-' + stamp)
|
|
updated = refresh(saved, backups, args.exclude_version)
|
|
write(STATE, json.dumps(updated, indent=2) + '\n', backups, 0o600)
|
|
|
|
|
|
if __name__ == '__main__':
|
|
try:
|
|
main()
|
|
except (ValueError, OSError, RuntimeError, subprocess.CalledProcessError) as error:
|
|
print('Boot refresh: ' + str(error), file=sys.stderr)
|
|
sys.exit(1)
|