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Merge pull request #302590 from nikstur/repart-image-label-length

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nixos/image/repart: assert maximum label length
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nikstur 2024-04-08 18:48:53 +02:00 committed by GitHub
commit 80cafa6a29
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3 changed files with 46 additions and 3 deletions
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5
nixos/lib/systemd-lib.nix
View file

@ -525,4 +525,9 @@ in rec {
)}
'';
# The maximum number of characters allowed in a GPT partition label. This
# limit is specified by UEFI and enforced by systemd-repart.
# Corresponds to GPT_LABEL_MAX from systemd's gpt.h.
GPTMaxLabelLength = 36;
}

38
nixos/modules/image/repart.nix
View file

@ -6,6 +6,8 @@
let
cfg = config.image.repart;
inherit (utils.systemdUtils.lib) GPTMaxLabelLength;
partitionOptions = {
options = {
storePaths = lib.mkOption {
@ -224,6 +226,42 @@ in
config = {
assertions = lib.mapAttrsToList (fileName: partitionConfig:
let
inherit (partitionConfig) repartConfig;
labelLength = builtins.stringLength repartConfig.Label;
in
{
assertion = repartConfig ? Label -> GPTMaxLabelLength >= labelLength;
message = ''
The partition label '${repartConfig.Label}'
defined for '${fileName}' is ${toString labelLength} characters long,
but the maximum label length supported by UEFI is ${toString
GPTMaxLabelLength}.
'';
}
) cfg.partitions;
warnings = lib.filter (v: v != null) (lib.mapAttrsToList (fileName: partitionConfig:
let
inherit (partitionConfig) repartConfig;
suggestedMaxLabelLength = GPTMaxLabelLength - 2;
labelLength = builtins.stringLength repartConfig.Label;
in
if (repartConfig ? Label && labelLength >= suggestedMaxLabelLength) then ''
The partition label '${repartConfig.Label}'
defined for '${fileName}' is ${toString labelLength} characters long.
The suggested maximum label length is ${toString
suggestedMaxLabelLength}.
If you use sytemd-sysupdate style A/B updates, this might
not leave enough space to increment the version number included in
the label in a future release. For example, if your label is
${toString GPTMaxLabelLength} characters long (the maximum enforced by UEFI) and
you're at version 9, you cannot increment this to 10.
'' else null
) cfg.partitions);
image.repart =
let
version = config.image.repart.version;

6
nixos/modules/system/boot/systemd/repart.nix
View file

@ -13,14 +13,14 @@ let
partitionAssertions = lib.mapAttrsToList (fileName: definition:
let
maxLabelLength = 36; # GPT_LABEL_MAX defined in systemd's gpt.h
inherit (utils.systemdUtils.lib) GPTMaxLabelLength;
labelLength = builtins.stringLength definition.Label;
in
{
assertion = definition ? Label -> maxLabelLength >= labelLength;
assertion = definition ? Label -> GPTMaxLabelLength >= labelLength;
message = ''
The partition label '${definition.Label}' defined for '${fileName}' is ${toString labelLength}
characters long, but the maximum label length supported by systemd is ${toString maxLabelLength}.
characters long, but the maximum label length supported by systemd is ${toString GPTMaxLabelLength}.
'';
}
) cfg.partitions;