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home-environment: add home.uid option

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Add a home.uid option similar to home.username. When set, the
activation script verifies the current UID matches the expected
value using the new checkUid function.

When using the NixOS or nix-darwin modules, home.uid is
auto-discovered from users.users.<name>.uid when that value
is set.

This is useful for constructing paths that depend on the user's
UID, such as /run/user/<uid> paths for gpg-agent sockets or
other user-specific runtime directories.
This commit is contained in:
Bernardo Meurer 2025-12-03 22:52:03 +00:00 • committed by Matthieu Coudron
parent d441981b20
commit a521eab881
6 changed files with 38 additions and 0 deletions
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10
modules/home-environment.nix
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@ -193,6 +193,13 @@ in
description = "The user's username.";
};
home.uid = mkOption {
type = types.nullOr types.ints.unsigned;
default = null;
example = 1000;
description = "The user's uid.";
};
home.homeDirectory = mkOption {
type = types.path;
defaultText = literalExpression ''
@ -842,6 +849,9 @@ in
if [[ ! -v SKIP_SANITY_CHECKS ]]; then
checkUsername ${lib.escapeShellArg config.home.username}
checkHomeDirectory ${lib.escapeShellArg config.home.homeDirectory}
${lib.optionalString (config.home.uid != null) ''
checkUid ${toString config.home.uid}
''}
fi
${lib.optionalString config.home.activationGenerateGcRoot ''