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users: migrate nixbld -> _nixbld

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According to some investigation creating "role" accounts avoids
migration problems when upgrading to certain macOS versions, so create
the build users to match that definition and remove the old ones if
present.

    Role accounts require name starting with _ and UID in 200-400 range
This commit is contained in:
Daiderd Jordan 2021-02-17 21:58:03 +01:00
parent 3b28c4675a
commit 5c3146b75d
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GPG key ID: D02435D05B810C96
2 changed files with 26 additions and 7 deletions
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20
modules/system/checks.nix
View file

@ -44,14 +44,29 @@ let
fi
'';
oldBuildUsers = ''
if dscl . -list /Users | grep -q '^nixbld'; then
echo "warning: Detected old style nixbld users" >&2
echo "These can cause migration problems when upgrading to certain macOS versions" >&2
echo "Running the installer again will remove and recreate the users in a way that avoids these problems" >&2
echo >&2
echo "$ darwin-install" >&2
echo >&2
echo "or enable to automatically manage the users" >&2
echo >&2
echo " users.nix.configureBuildUsers = true;" >&2
echo >&2
fi
'';
buildUsers = ''
buildUser=$(dscl . -read /Groups/nixbld GroupMembership 2>&1 | awk '/^GroupMembership: / {print $2}') || true
if [ -z $buildUser ]; then
echo "error: Using the nix-daemon requires build users, aborting activation" >&2
echo "Create the build users or disable the daemon:" >&2
echo "$ ./bootstrap -u" >&2
echo "$ darwin-install" >&2
echo >&2
echo "or set" >&2
echo "or set (this requires some manual intervention to restore permissions)" >&2
echo >&2
echo " services.nix-daemon.enable = false;" >&2
echo >&2
@ -200,6 +215,7 @@ in
system.checks.text = mkMerge [
darwinChanges
runLink
oldBuildUsers
(mkIf config.nix.useDaemon buildUsers)
(mkIf (!config.nix.useDaemon) singleUser)
nixStore

13
modules/users/nixbld/default.nix
View file

@ -13,9 +13,9 @@ let
mkUsers = f: genList (x: f (x + 1)) cfg.nix.nrBuildUsers;
buildUsers = mkUsers (i: {
name = "nixbld${toString i}";
uid = 30000 + i;
gid = 30000;
name = "_nixbld${toString i}";
uid = 300 + i;
gid = 300;
description = "Nix build user ${toString i}";
});
@ -52,7 +52,7 @@ in
assertions = [
{ assertion = elem "nixbld" cfg.knownGroups -> elem "nixbld" createdGroups; message = "refusing to delete group nixbld in users.knownGroups, this would break nix"; }
{ assertion = elem "nixbld1" cfg.knownUsers -> elem "nixbld1" createdUsers; message = "refusing to delete user nixbld1 in users.knownUsers, this would break nix"; }
{ assertion = elem "_nixbld1" cfg.knownUsers -> elem "_nixbld1" createdUsers; message = "refusing to delete user _nixbld1 in users.knownUsers, this would break nix"; }
{ assertion = cfg.groups ? "nixbld" -> cfg.groups.nixbld.members != []; message = "refusing to remove all members from nixbld group, this would break nix"; }
];
@ -60,7 +60,10 @@ in
users.users = mkIf cfg.nix.configureBuildUsers (named buildUsers);
users.knownGroups = mkIf cfg.nix.configureBuildUsers [ "nixbld" ];
users.knownUsers = mkIf cfg.nix.configureBuildUsers (mkUsers (i: "nixbld${toString i}"));
users.knownUsers = mkIf cfg.nix.configureBuildUsers (mkMerge [
(mkUsers (i: "_nixbld${toString i}"))
(mkUsers (i: "nixbld${toString i}")) # delete old style nixbld users
]);
};
}