117 lines
4.3 KiB
Python
117 lines
4.3 KiB
Python
#! @python@/bin/python
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import argparse
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import shutil
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import os
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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 errno
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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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system_dir = lambda generation: "/nix/var/nix/profiles/system-%d-link" % (generation)
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def write_entry(generation, kernel, initrd):
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entry_file = "@efiSysMountPoint@/loader/entries/nixos-generation-%d.conf" % (generation)
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generation_dir = os.readlink(system_dir(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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print >> f, "title NixOS"
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print >> f, "version Generation %d" % (generation)
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if machine_id is not None: print >> f, "machine-id %s" % (machine_id)
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print >> f, "linux %s" % (kernel)
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print >> f, "initrd %s" % (initrd)
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print >> f, "options %s" % (kernel_params)
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os.rename(tmp_path, entry_file)
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def write_loader_conf(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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print >> f, "timeout @timeout@"
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print >> f, "default nixos-generation-%d" % (generation)
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os.rename("@efiSysMountPoint@/loader/loader.conf.tmp", "@efiSysMountPoint@/loader/loader.conf")
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def copy_from_profile(generation, name, dry_run=False):
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store_file_path = os.readlink("%s/%s" % (system_dir(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 add_entry(generation):
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efi_kernel_path = copy_from_profile(generation, "kernel")
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efi_initrd_path = copy_from_profile(generation, "initrd")
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write_entry(generation, efi_kernel_path, efi_initrd_path)
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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):
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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" % (profile)
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])
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gen_lines = gen_list.split('\n')
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gen_lines.pop()
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return [ int(line.split()[0]) for line in gen_lines ]
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def remove_old_entries(gens):
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slice_start = len("@efiSysMountPoint@/loader/entries/nixos-generation-")
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slice_end = -1 * len(".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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for path in glob.iglob("@efiSysMountPoint@/loader/entries/nixos-generation-[1-9]*.conf"):
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try:
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gen = int(path[slice_start:slice_end])
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if not 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:
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os.unlink(path)
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parser = argparse.ArgumentParser(description='Update NixOS-related gummiboot 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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# We deserve our own env var!
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if os.getenv("NIXOS_INSTALL_GRUB") == "1":
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if "@canTouchEfiVariables@" == "1":
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subprocess.check_call(["@gummiboot@/bin/gummiboot", "--path=@efiSysMountPoint@", "install"])
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else:
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subprocess.check_call(["@gummiboot@/bin/gummiboot", "--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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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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machine_id = None
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gens = get_generations("system")
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remove_old_entries(gens)
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for gen in gens:
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add_entry(gen)
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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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