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systemd-boot: add 'graceful' configuration option

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On some systems bootctl cannot write the `LoaderSystemToken` EFI variable
during installation, which results in a failure to install the boot
loader. Upstream provides a flag (--graceful) to ignore such write failures -
this change exposes it as a configuration option.

As the exact semantics of this option appear to be somewhat volatile it
should be used only if systemd-boot otherwise fails to install.
This commit is contained in:
Joerie de Gram 2021-09-26 17:54:36 +02:00
parent 5e37cc3186
commit 7bd84b6685
2 changed files with 26 additions and 5 deletions
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13
nixos/modules/system/boot/loader/systemd-boot/systemd-boot-builder.py
View File

@ -208,10 +208,15 @@ def main() -> None:
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"])
flags = []
if "@canTouchEfiVariables@" != "1":
flags.append("--no-variables")
if "@graceful@" == "1":
flags.append("--graceful")
subprocess.check_call(["@systemd@/bin/bootctl", "--path=@efiSysMountPoint@"] + flags + ["install"])
else:
# Update bootloader to latest if needed
systemd_version = subprocess.check_output(["@systemd@/bin/bootctl", "--version"], universal_newlines=True).split()[1]

18
nixos/modules/system/boot/loader/systemd-boot/systemd-boot.nix
View File

@ -24,7 +24,7 @@ let
configurationLimit = if cfg.configurationLimit == null then 0 else cfg.configurationLimit;
inherit (cfg) consoleMode;
inherit (cfg) consoleMode graceful;
inherit (efi) efiSysMountPoint canTouchEfiVariables;
@ -126,6 +126,22 @@ in {
'';
};
};
graceful = mkOption {
default = false;
type = types.bool;
description = ''
Invoke <literal>bootctl install</literal> with the <literal>--graceful</literal> option,
which ignores errors when EFI variables cannot be written or when the EFI System Partition
cannot be found. Currently only applies to random seed operations.
Only enable this option if <literal>systemd-boot</literal> otherwise fails to install, as the
scope or implication of the <literal>--graceful</literal> option may change in the future.
'';
};
};
config = mkIf cfg.enable {