nixos/systemd-boot: create boot entries for specialisations
Some specialisations (such as those which affect various boot-time attributes) cannot be switched to at runtime. This allows picking the specialisation at boot time.
This commit is contained in:
Luke Granger-Brown
parent
052231cf79
commit
13fad0f81b
2 changed files with 73 additions and 23 deletions
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@ -17,19 +17,28 @@ import glob
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import os.path
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from typing import Tuple, List, Optional
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SystemIdentifier = Tuple[Optional[str], int, Optional[str]]
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def copy_if_not_exists(source: str, dest: str) -> None:
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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: Optional[str], generation: int) -> str:
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def generation_dir(profile: Optional[str], generation: int) -> str:
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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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BOOT_ENTRY = """title NixOS{profile}
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def system_dir(profile: Optional[str], generation: int, specialisation: Optional[str]) -> str:
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d = generation_dir(profile, generation)
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if specialisation:
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return os.path.join(d, "specialisation", specialisation)
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else:
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return d
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BOOT_ENTRY = """title NixOS{profile}{specialisation}
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version Generation {generation} {description}
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linux {kernel}
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initrd {initrd}
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@ -46,26 +55,34 @@ efi /efi/memtest86/BOOTX64.efi
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"""
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def write_loader_conf(profile: Optional[str], generation: int) -> None:
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def generation_conf_filename(profile: Optional[str], generation: int, specialisation: Optional[str]) -> str:
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pieces = [
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"nixos",
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profile or None,
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"generation",
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str(generation),
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f"specialisation-{specialisation}" if specialisation else None,
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]
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return "-".join(p for p in pieces if p) + ".conf"
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def write_loader_conf(profile: Optional[str], generation: int, specialisation: Optional[str]) -> None:
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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.conf\n" % (profile, generation))
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else:
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f.write("default nixos-generation-%d.conf\n" % (generation))
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f.write("default %s\n" % generation_conf_filename(profile, generation, specialisation))
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if not @editor@:
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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: Optional[str], generation: int, name: str) -> str:
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return os.path.realpath("%s/%s" % (system_dir(profile, generation), name))
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def profile_path(profile: Optional[str], generation: int, specialisation: Optional[str], name: str) -> str:
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return os.path.realpath("%s/%s" % (system_dir(profile, generation, specialisation), name))
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def copy_from_profile(profile: Optional[str], generation: int, name: str, dry_run: bool = False) -> str:
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store_file_path = profile_path(profile, generation, name)
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def copy_from_profile(profile: Optional[str], generation: int, specialisation: Optional[str], name: str, dry_run: bool = False) -> str:
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store_file_path = profile_path(profile, generation, specialisation, 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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@ -95,19 +112,17 @@ def describe_generation(generation_dir: str) -> str:
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return description
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def write_entry(profile: Optional[str], generation: int, machine_id: str) -> None:
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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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def write_entry(profile: Optional[str], generation: int, specialisation: Optional[str], machine_id: str) -> None:
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kernel = copy_from_profile(profile, generation, specialisation, "kernel")
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initrd = copy_from_profile(profile, generation, specialisation, "initrd")
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try:
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append_initrd_secrets = profile_path(profile, generation, "append-initrd-secrets")
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append_initrd_secrets = profile_path(profile, generation, specialisation, "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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entry_file = "@efiSysMountPoint@/loader/entries/%s" % (
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generation_conf_filename(profile, generation, specialisation))
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generation_dir = os.readlink(system_dir(profile, generation, specialisation))
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tmp_path = "%s.tmp" % (entry_file)
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kernel_params = "init=%s/init " % generation_dir
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@ -115,6 +130,7 @@ def write_entry(profile: Optional[str], generation: int, machine_id: str) -> Non
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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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specialisation=" (%s)" % specialisation if specialisation else "",
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generation=generation,
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kernel=kernel,
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initrd=initrd,
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@ -133,7 +149,7 @@ def mkdir_p(path: str) -> None:
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raise
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def get_generations(profile: Optional[str] = None) -> List[Tuple[Optional[str], int]]:
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def get_generations(profile: Optional[str] = None) -> List[SystemIdentifier]:
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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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@ -145,10 +161,19 @@ def get_generations(profile: Optional[str] = None) -> List[Tuple[Optional[str],
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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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configurations: List[SystemIdentifier] = [ (profile, int(line.split()[0]), None) for line in gen_lines ]
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return configurations[-configurationLimit:]
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def remove_old_entries(gens: List[Tuple[Optional[str], int]]) -> None:
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def get_specialisations(profile: Optional[str], generation: int, _: Optional[str]) -> List[SystemIdentifier]:
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specialisations_dir = os.path.join(
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system_dir(profile, generation, None), "specialisation")
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if not os.path.exists(specialisations_dir):
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return []
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return [(profile, generation, spec) for spec in os.listdir(specialisations_dir)]
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def remove_old_entries(gens: List[SystemIdentifier]) -> None:
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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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@ -243,6 +268,8 @@ def main() -> None:
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for gen in gens:
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try:
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write_entry(*gen, machine_id)
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for specialisation in get_specialisations(*gen):
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write_entry(*specialisation, 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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except OSError as e:
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@ -39,6 +39,29 @@ in
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'';
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};
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# Check that specialisations create corresponding boot entries.
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specialisation = makeTest {
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name = "systemd-boot-specialisation";
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meta.maintainers = with pkgs.stdenv.lib.maintainers; [ lukegb ];
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machine = { pkgs, lib, ... }: {
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imports = [ common ];
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specialisation.something.configuration = {};
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};
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testScript = ''
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machine.start()
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machine.wait_for_unit("multi-user.target")
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machine.succeed(
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"test -e /boot/loader/entries/nixos-generation-1-specialisation-something.conf"
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)
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machine.succeed(
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"grep -q 'title NixOS (something)' /boot/loader/entries/nixos-generation-1-specialisation-something.conf"
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)
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'';
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};
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# Boot without having created an EFI entry--instead using default "/EFI/BOOT/BOOTX64.EFI"
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fallback = makeTest {
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name = "systemd-boot-fallback";
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