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nixos/systemd-nspawn: disallow multiple packages with .nspawn-units

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In contrast to `.service`-units, it's not possible to declare an
`overrides.conf`, however this is done by `generateUnits` for `.nspawn`
units as well. This change breaks the build if you have two derivations
configuring one nspawn unit.

This will happen in a case like this:

``` nix
{ pkgs, ... }: {
  systemd.packages = [
    (pkgs.writeTextDir "etc/systemd/nspawn/container0.nspawn" ''
      [Files]
      Bind=/tmp
    '')
  ];
  systemd.nspawn.container0 = {
    /* ... */
  };
}
```
This commit is contained in:
Maximilian Bosch 2020-04-04 21:11:21 +02:00
parent 384a164a25
commit a9e3ec1d6e
No known key found for this signature in database
GPG Key ID: 091DBF4D1FC46B8E
2 changed files with 11 additions and 4 deletions
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13
nixos/modules/system/boot/systemd-lib.nix
View File

@ -114,7 +114,9 @@ in rec {
(if isList value then value else [value]))
as));
generateUnits = type: units: upstreamUnits: upstreamWants:
generateUnits = generateUnits' true;
generateUnits' = allowCollisions: type: units: upstreamUnits: upstreamWants:
pkgs.runCommand "${type}-units"
{ preferLocalBuild = true;
allowSubstitutes = false;
@ -182,8 +184,13 @@ in rec {
if [ "$(readlink -f $i/$fn)" = /dev/null ]; then
ln -sfn /dev/null $out/$fn
else
mkdir -p $out/$fn.d
ln -s $i/$fn $out/$fn.d/overrides.conf
${if allowCollisions then ''
mkdir -p $out/$fn.d
ln -s $i/$fn $out/$fn.d/overrides.conf
'' else ''
echo "Found multiple derivations configuring $fn!"
exit 1
''}
fi
else
ln -fs $i/$fn $out/

2
nixos/modules/system/boot/systemd-nspawn.nix
View File

@ -116,7 +116,7 @@ in {
in
mkMerge [
(mkIf (cfg != {}) {
environment.etc."systemd/nspawn".source = mkIf (cfg != {}) (generateUnits "nspawn" units [] []);
environment.etc."systemd/nspawn".source = mkIf (cfg != {}) (generateUnits' false "nspawn" units [] []);
})
{
systemd.targets.multi-user.wants = [ "machines.target" ];