352 lines
14 KiB
Python
352 lines
14 KiB
Python
#! @python3@/bin/python3 -B
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import argparse
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import shutil
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import os
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import sys
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import errno
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import subprocess
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import glob
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import tempfile
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import warnings
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import ctypes
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libc = ctypes.CDLL("libc.so.6")
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import re
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import datetime
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import os.path
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def copy_if_not_exists(source, dest):
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if not os.path.exists(dest):
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shutil.copyfile(source, dest)
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def system_dir(profile, generation):
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if profile:
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return "/nix/var/nix/profiles/system-profiles/%s-%d-link" % (profile, generation)
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else:
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return "/nix/var/nix/profiles/system-%d-link" % (generation)
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SECURE_BOOT_ENTRY = """title NixOS{profile}
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version Generation {generation} {description} (Secure Boot)
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efi {efi}
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"""
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BOOT_ENTRY = """title NixOS{profile}
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version Generation {generation} {description}
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linux {kernel}
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initrd {initrd}
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options {kernel_params}
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"""
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# The boot loader entry for memtest86.
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#
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# TODO: This is hard-coded to use the 64-bit EFI app, but it could probably
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# be updated to use the 32-bit EFI app on 32-bit systems. The 32-bit EFI
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# app filename is BOOTIA32.efi.
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MEMTEST_BOOT_ENTRY = """title MemTest86
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efi /efi/memtest86/BOOTX64.efi
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"""
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def write_loader_conf(profile, generation):
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with open("@efiSysMountPoint@/loader/loader.conf.tmp", 'w') as f:
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if "@timeout@" != "":
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f.write("timeout @timeout@\n")
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if profile:
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f.write("default nixos-%s-generation-%d\n" % (profile, generation))
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else:
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f.write("default nixos-generation-%d\n" % (generation))
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if "@editor@" != "1":
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f.write("editor 0\n");
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f.write("console-mode @consoleMode@\n");
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os.rename("@efiSysMountPoint@/loader/loader.conf.tmp", "@efiSysMountPoint@/loader/loader.conf")
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def profile_path(profile, generation, name):
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return os.readlink("%s/%s" % (system_dir(profile, generation), name))
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def copy_from_profile(profile, generation, name, dry_run=False):
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store_file_path = profile_path(profile, generation, name)
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suffix = os.path.basename(store_file_path)
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store_dir = os.path.basename(os.path.dirname(store_file_path))
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efi_file_path = "/efi/nixos/%s-%s.efi" % (store_dir, suffix)
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if not dry_run:
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copy_if_not_exists(store_file_path, "@efiSysMountPoint@%s" % (efi_file_path))
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return efi_file_path
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def describe_generation(generation_dir):
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try:
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with open("%s/nixos-version" % generation_dir) as f:
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nixos_version = f.read()
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except IOError:
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nixos_version = "Unknown"
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kernel_dir = os.path.dirname(os.path.realpath("%s/kernel" % generation_dir))
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module_dir = glob.glob("%s/lib/modules/*" % kernel_dir)[0]
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kernel_version = os.path.basename(module_dir)
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build_time = int(os.path.getctime(generation_dir))
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build_date = datetime.datetime.fromtimestamp(build_time).strftime('%F')
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description = "NixOS {}, Linux Kernel {}, Built on {}".format(
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nixos_version, kernel_version, build_date
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)
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return description
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def write_entry(profile, generation, machine_id):
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kernel = copy_from_profile(profile, generation, "kernel")
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initrd = copy_from_profile(profile, generation, "initrd")
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try:
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append_initrd_secrets = profile_path(profile, generation, "append-initrd-secrets")
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subprocess.check_call([append_initrd_secrets, "@efiSysMountPoint@%s" % (initrd)])
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except FileNotFoundError:
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pass
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if profile:
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entry_file = "@efiSysMountPoint@/loader/entries/nixos-%s-generation-%d.conf" % (profile, generation)
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else:
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entry_file = "@efiSysMountPoint@/loader/entries/nixos-generation-%d.conf" % (generation)
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generation_dir = os.readlink(system_dir(profile, generation))
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tmp_path = "%s.tmp" % (entry_file)
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kernel_params = "systemConfig=%s init=%s/init " % (generation_dir, generation_dir)
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with open("%s/kernel-params" % (generation_dir)) as params_file:
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kernel_params = kernel_params + params_file.read()
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with open(tmp_path, 'w') as f:
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f.write(BOOT_ENTRY.format(profile=" [" + profile + "]" if profile else "",
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generation=generation,
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kernel=kernel,
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initrd=initrd,
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kernel_params=kernel_params,
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description=describe_generation(generation_dir)))
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if machine_id is not None:
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f.write("machine-id %s\n" % machine_id)
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os.rename(tmp_path, entry_file)
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def sb_efi_file_name_relative(profile, generation):
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if profile:
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return "efi/nixos/nixos-%s-generation-%d.efi" % (profile, generation)
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else:
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return "efi/nixos/nixos-generation-%d.efi" % (generation)
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def make_signed_efi(profile, generation, efi_file):
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with tempfile.TemporaryDirectory() as tmpdir:
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append_initrd_secrets = profile_path(profile, generation, "append-initrd-secrets")
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if os.path.exists(append_initrd_secrets):
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initrd = f"{tmpdir}/initrd"
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shutil.copyfile(
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profile_path(profile, generation, "initrd"),
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initrd
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)
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subprocess.check_call([append_initrd_secrets, "@efiSysMountPoint@%s" % (initrd)])
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else:
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initrd = profile_path(profile, generation, "initrd"),
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generation_dir = os.readlink(system_dir(profile, generation))
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tmp_path = "%s/efistub" % (tmpdir)
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kernel_params = "systemConfig=%s init=%s/init " % (generation_dir, generation_dir)
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with open("%s/kernel-params" % (generation_dir)) as params_file:
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kernel_params = kernel_params + params_file.read()
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kernel_param_file = "%s/kernel_params" % tmpdir
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with open(kernel_param_file, 'w') as f:
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f.write(kernel_params)
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subprocess.check_call([
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"@binutils@/bin/objcopy",
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"--add-section", ".osrel={}/etc/os-release".format(generation_dir), "--change-section-vma", ".osrel=0x20000",
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"--add-section", ".cmdline={}".format(kernel_param_file), "--change-section-vma", ".cmdline=0x30000",
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"--add-section", ".linux={}/kernel".format(generation_dir), "--change-section-vma", ".linux=0x40000",
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"--add-section", ".initrd={}".format(initrd), "--change-section-vma", ".initrd=0x3000000",
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"{}/sw/lib/systemd/boot/efi/linuxx64.efi.stub".format(generation_dir),
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tmp_path
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])
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sign_path(tmp_path, efi_file)
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def write_secureboot_entry(profile, generation, machine_id):
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if profile:
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entry_file = "@efiSysMountPoint@/loader/entries/nixos-%s-generation-%d.conf" % (profile, generation)
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else:
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entry_file = "@efiSysMountPoint@/loader/entries/nixos-generation-%d.conf" % (generation)
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efi_file_relative = sb_efi_file_name_relative(profile, generation)
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efi_file = "@efiSysMountPoint@/%s" % (efi_file_relative)
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try:
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sbverify(efi_file)
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except:
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make_signed_efi(profile, generation, efi_file)
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generation_dir = os.readlink(system_dir(profile, generation))
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entry_tmp = entry_file + ".tmp";
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with open(entry_tmp, 'w') as fp:
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fp.write(SECURE_BOOT_ENTRY.format(
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profile=" [" + profile + "]" if profile else "",
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generation=generation,
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efi=efi_file_relative,
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description=describe_generation(generation_dir)
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))
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if machine_id is not None:
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fp.write("machine-id %s\n" % machine_id)
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os.rename(entry_tmp, entry_file)
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def sign_path(src, output):
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with tempfile.TemporaryDirectory() as tmpdir:
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print(f"Signing {output}")
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subprocess.check_call([
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"@sbsigntool@/bin/sbsign",
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"--key", "@signingKey@",
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"--cert", "@signingCertificate@",
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"--output", f"{tmpdir}/signed",
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src
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])
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# Very likely to move across filesystems, so use
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# shutil.move over os.rename.
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shutil.move(f"{tmpdir}/signed", f"{output}.tmp")
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try:
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sbverify(f"{output}.tmp")
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os.rename(f"{output}.tmp", output)
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except:
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os.unlink(f"{output}.tmp")
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raise
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def sbverify(filename):
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subprocess.check_call([
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"@sbsigntool@/bin/sbverify",
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"--cert", "@signingCertificate@",
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filename,
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])
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def mkdir_p(path):
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try:
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os.makedirs(path)
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except OSError as e:
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if e.errno != errno.EEXIST or not os.path.isdir(path):
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raise
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def get_generations(profile=None):
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gen_list = subprocess.check_output([
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"@nix@/bin/nix-env",
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"--list-generations",
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"-p",
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"/nix/var/nix/profiles/%s" % ("system-profiles/" + profile if profile else "system"),
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"--option", "build-users-group", ""],
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universal_newlines=True)
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gen_lines = gen_list.split('\n')
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gen_lines.pop()
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configurationLimit = @configurationLimit@
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return [ (profile, int(line.split()[0])) for line in gen_lines ][-configurationLimit:]
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def remove_old_entries(gens):
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rex_profile = re.compile("^@efiSysMountPoint@/loader/entries/nixos-(.*)-generation-.*\.conf$")
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rex_generation = re.compile("^@efiSysMountPoint@/loader/entries/nixos.*-generation-(.*)\.conf$")
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known_paths = []
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for gen in gens:
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known_paths.append(copy_from_profile(*gen, "kernel", True))
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known_paths.append(copy_from_profile(*gen, "initrd", True))
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known_paths.append("@efiSysMountPoint@/%s" % sb_efi_file_name_relative(*gen))
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for path in glob.iglob("@efiSysMountPoint@/loader/entries/nixos*-generation-[1-9]*.conf"):
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try:
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if rex_profile.match(path):
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prof = rex_profile.sub(r"\1", path)
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else:
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prof = "system"
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gen = int(rex_generation.sub(r"\1", path))
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if not (prof, gen) in gens:
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os.unlink(path)
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except ValueError:
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pass
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for path in glob.iglob("@efiSysMountPoint@/efi/nixos/*"):
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if not path in known_paths and not os.path.isdir(path):
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os.unlink(path)
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def get_profiles():
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if os.path.isdir("/nix/var/nix/profiles/system-profiles/"):
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return [x
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for x in os.listdir("/nix/var/nix/profiles/system-profiles/")
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if not x.endswith("-link")]
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else:
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return []
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def main():
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parser = argparse.ArgumentParser(description='Update NixOS-related systemd-boot files')
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parser.add_argument('default_config', metavar='DEFAULT-CONFIG', help='The default NixOS config to boot')
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args = parser.parse_args()
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try:
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with open("/etc/machine-id") as machine_file:
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machine_id = machine_file.readlines()[0]
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except IOError as e:
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if e.errno != errno.ENOENT:
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raise
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# Since systemd version 232 a machine ID is required and it might not
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# be there on newly installed systems, so let's generate one so that
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# bootctl can find it and we can also pass it to write_entry() later.
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cmd = ["@systemd@/bin/systemd-machine-id-setup", "--print"]
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machine_id = subprocess.check_output(cmd).rstrip()
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if os.getenv("NIXOS_INSTALL_GRUB") == "1":
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warnings.warn("NIXOS_INSTALL_GRUB env var deprecated, use NIXOS_INSTALL_BOOTLOADER", DeprecationWarning)
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os.environ["NIXOS_INSTALL_BOOTLOADER"] = "1"
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if os.getenv("NIXOS_INSTALL_BOOTLOADER") == "1":
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# bootctl uses fopen() with modes "wxe" and fails if the file exists.
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if os.path.exists("@efiSysMountPoint@/loader/loader.conf"):
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os.unlink("@efiSysMountPoint@/loader/loader.conf")
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if "@canTouchEfiVariables@" == "1":
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subprocess.check_call(["@systemd@/bin/bootctl", "--path=@efiSysMountPoint@", "install"])
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else:
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subprocess.check_call(["@systemd@/bin/bootctl", "--path=@efiSysMountPoint@", "--no-variables", "install"])
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mkdir_p("@efiSysMountPoint@/efi/nixos")
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mkdir_p("@efiSysMountPoint@/loader/entries")
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if "@signed@" == "1":
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sign_path("@efiSysMountPoint@/EFI/BOOT/BOOTX64.EFI", "@efiSysMountPoint@/EFI/BOOT/BOOTX64.EFI")
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sign_path("@efiSysMountPoint@/EFI/systemd/systemd-bootx64.efi", "@efiSysMountPoint@/EFI/systemd/systemd-bootx64.efi")
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gens = get_generations()
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for profile in get_profiles():
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gens += get_generations(profile)
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remove_old_entries(gens)
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for gen in gens:
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if "@signed@"== "1":
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write_secureboot_entry(*gen, machine_id)
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else:
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write_entry(*gen, machine_id)
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if os.readlink(system_dir(*gen)) == args.default_config:
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write_loader_conf(*gen)
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memtest_entry_file = "@efiSysMountPoint@/loader/entries/memtest86.conf"
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if os.path.exists(memtest_entry_file):
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os.unlink(memtest_entry_file)
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shutil.rmtree("@efiSysMountPoint@/efi/memtest86", ignore_errors=True)
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if "@memtest86@" != "":
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mkdir_p("@efiSysMountPoint@/efi/memtest86")
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for path in glob.iglob("@memtest86@/*"):
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if os.path.isdir(path):
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shutil.copytree(path, os.path.join("@efiSysMountPoint@/efi/memtest86", os.path.basename(path)))
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else:
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shutil.copy(path, "@efiSysMountPoint@/efi/memtest86/")
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memtest_entry_file = "@efiSysMountPoint@/loader/entries/memtest86.conf"
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memtest_entry_file_tmp_path = "%s.tmp" % memtest_entry_file
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with open(memtest_entry_file_tmp_path, 'w') as f:
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f.write(MEMTEST_BOOT_ENTRY)
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os.rename(memtest_entry_file_tmp_path, memtest_entry_file)
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# Since fat32 provides little recovery facilities after a crash,
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# it can leave the system in an unbootable state, when a crash/outage
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# happens shortly after an update. To decrease the likelihood of this
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# event sync the efi filesystem after each update.
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rc = libc.syncfs(os.open("@efiSysMountPoint@", os.O_RDONLY))
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if rc != 0:
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print("could not sync @efiSysMountPoint@: {}".format(os.strerror(rc)), file=sys.stderr)
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if __name__ == '__main__':
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main()
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