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#! @python3@/bin/python3
import argparse
import shutil
import os
import errno
import subprocess
import glob
import tempfile
import errno
import warnings
def copy_if_not_exists(source, dest):
if not os.path.exists(dest):
shutil.copyfile(source, dest)
def system_dir(generation):
return "/nix/var/nix/profiles/system-%d-link" % (generation)
BOOT_ENTRY = """title NixOS
version Generation {generation}
linux {kernel}
initrd {initrd}
options {kernel_params}
"""
def write_loader_conf(generation):
with open("@efiSysMountPoint@/loader/loader.conf.tmp", 'w') as f:
if "@timeout@" != "":
f.write("timeout @timeout@\n")
f.write("default nixos-generation-%d\n" % generation)
if not @editor@:
f.write("editor 0");
os.rename("@efiSysMountPoint@/loader/loader.conf.tmp", "@efiSysMountPoint@/loader/loader.conf")
def copy_from_profile(generation, name, dry_run=False):
store_file_path = os.readlink("%s/%s" % (system_dir(generation), name))
suffix = os.path.basename(store_file_path)
store_dir = os.path.basename(os.path.dirname(store_file_path))
efi_file_path = "/efi/nixos/%s-%s.efi" % (store_dir, suffix)
if not dry_run:
copy_if_not_exists(store_file_path, "@efiSysMountPoint@%s" % (efi_file_path))
return efi_file_path
def write_entry(generation, machine_id):
kernel = copy_from_profile(generation, "kernel")
initrd = copy_from_profile(generation, "initrd")
entry_file = "@efiSysMountPoint@/loader/entries/nixos-generation-%d.conf" % (generation)
generation_dir = os.readlink(system_dir(generation))
tmp_path = "%s.tmp" % (entry_file)
kernel_params = "systemConfig=%s init=%s/init " % (generation_dir, generation_dir)
with open("%s/kernel-params" % (generation_dir)) as params_file:
kernel_params = kernel_params + params_file.read()
with open(tmp_path, 'w') as f:
f.write(BOOT_ENTRY.format(generation=generation,
kernel=kernel,
initrd=initrd,
kernel_params=kernel_params))
if machine_id is not None:
f.write("machine-id %s\n" % machine_id)
os.rename(tmp_path, entry_file)
def mkdir_p(path):
try:
os.makedirs(path)
except OSError as e:
if e.errno != errno.EEXIST or not os.path.isdir(path):
raise
def get_generations(profile):
gen_list = subprocess.check_output([
"@nix@/bin/nix-env",
"--list-generations",
"-p",
"/nix/var/nix/profiles/%s" % (profile),
"--option", "build-users-group", ""],
universal_newlines=True)
gen_lines = gen_list.split('\n')
gen_lines.pop()
return [ int(line.split()[0]) for line in gen_lines ]
def remove_old_entries(gens):
slice_start = len("@efiSysMountPoint@/loader/entries/nixos-generation-")
slice_end = -1 * len(".conf")
known_paths = []
for gen in gens:
known_paths.append(copy_from_profile(gen, "kernel", True))
known_paths.append(copy_from_profile(gen, "initrd", True))
for path in glob.iglob("@efiSysMountPoint@/loader/entries/nixos-generation-[1-9]*.conf"):
try:
gen = int(path[slice_start:slice_end])
if not gen in gens:
os.unlink(path)
except ValueError:
pass
for path in glob.iglob("@efiSysMountPoint@/efi/nixos/*"):
if not path in known_paths:
os.unlink(path)
def main():
parser = argparse.ArgumentParser(description='Update NixOS-related systemd-boot files')
parser.add_argument('default_config', metavar='DEFAULT-CONFIG', help='The default NixOS config to boot')
args = parser.parse_args()
try:
with open("/etc/machine-id") as machine_file:
machine_id = machine_file.readlines()[0]
except IOError as e:
if e.errno != errno.ENOENT:
raise
# Since systemd version 232 a machine ID is required and it might not
# be there on newly installed systems, so let's generate one so that
# bootctl can find it and we can also pass it to write_entry() later.
cmd = ["@systemd@/bin/systemd-machine-id-setup", "--print"]
machine_id = subprocess.check_output(cmd).rstrip()
if os.getenv("NIXOS_INSTALL_GRUB") == "1":
warnings.warn("NIXOS_INSTALL_GRUB env var deprecated, use NIXOS_INSTALL_BOOTLOADER", DeprecationWarning)
os.environ["NIXOS_INSTALL_BOOTLOADER"] = "1"
if os.getenv("NIXOS_INSTALL_BOOTLOADER") == "1":
# bootctl uses fopen() with modes "wxe" and fails if the file exists.
if os.path.exists("@efiSysMountPoint@/loader/loader.conf"):
os.unlink("@efiSysMountPoint@/loader/loader.conf")
if "@canTouchEfiVariables@" == "1":
subprocess.check_call(["@systemd@/bin/bootctl", "--path=@efiSysMountPoint@", "install"])
else:
subprocess.check_call(["@systemd@/bin/bootctl", "--path=@efiSysMountPoint@", "--no-variables", "install"])
mkdir_p("@efiSysMountPoint@/efi/nixos")
mkdir_p("@efiSysMountPoint@/loader/entries")
gens = get_generations("system")
remove_old_entries(gens)
for gen in gens:
write_entry(gen, machine_id)
if os.readlink(system_dir(gen)) == args.default_config:
write_loader_conf(gen)
if __name__ == '__main__':
main()
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