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Merge pull request #26967 from florianjacob/fix-systemd-resolved-nsswitch-loading

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Fix systemd resolved nsswitch loading and clearly state NSS module's dependency on nscd
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Jörg Thalheim 2017-06-30 09:26:18 +01:00 committed by GitHub
parent 2dae6e0b5f e370e97f3d
commit 1266c8f935
1 changed files with 28 additions and 10 deletions
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38
nixos/modules/config/nsswitch.nix
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@ -6,24 +6,29 @@ with lib;
let
inherit (config.services.avahi) nssmdns;
inherit (config.services.samba) nsswins;
ldap = (config.users.ldap.enable && config.users.ldap.nsswitch);
sssd = config.services.sssd.enable;
resolved = config.services.resolved.enable;
# only with nscd up and running we can load NSS modules that are not integrated in NSS
canLoadExternalModules = config.services.nscd.enable;
myhostname = canLoadExternalModules;
mymachines = canLoadExternalModules;
nssmdns = canLoadExternalModules && config.services.avahi.nssmdns;
nsswins = canLoadExternalModules && config.services.samba.nsswins;
ldap = canLoadExternalModules && (config.users.ldap.enable && config.users.ldap.nsswitch);
sssd = canLoadExternalModules && config.services.sssd.enable;
resolved = canLoadExternalModules && config.services.resolved.enable;
hostArray = [ "files" "mymachines" ]
hostArray = [ "files" ]
++ optionals mymachines [ "mymachines" ]
++ optionals nssmdns [ "mdns_minimal [!UNAVAIL=return]" ]
++ optionals nsswins [ "wins" ]
++ optionals resolved ["resolv [!UNAVAIL=return]"]
++ optionals resolved ["resolve [!UNAVAIL=return]"]
++ [ "dns" ]
++ optionals nssmdns [ "mdns" ]
++ ["myhostname" ];
++ optionals myhostname ["myhostname" ];
passwdArray = [ "files" ]
++ optional sssd "sss"
++ optionals ldap [ "ldap" ]
++ [ "mymachines" ];
++ optionals mymachines [ "mymachines" ];
shadowArray = [ "files" ]
++ optional sssd "sss"
@ -36,6 +41,7 @@ in {
options = {
# NSS modules. Hacky!
# Only works with nscd!
system.nssModules = mkOption {
type = types.listOf types.path;
internal = true;
@ -55,6 +61,18 @@ in {
};
config = {
assertions = [
{
# generic catch if the NixOS module adding to nssModules does not prevent it with specific message.
assertion = config.system.nssModules.path != "" -> canLoadExternalModules;
message = "Loading NSS modules from path ${config.system.nssModules.path} requires nscd being enabled.";
}
{
# resolved does not need to add to nssModules, therefore needs an extra assertion
assertion = resolved -> canLoadExternalModules;
message = "Loading systemd-resolved's nss-resolve NSS module requires nscd being enabled.";
}
];
# Name Service Switch configuration file. Required by the C
# library. !!! Factor out the mdns stuff. The avahi module
@ -78,7 +96,7 @@ in {
# configured IP addresses, or ::1 and 127.0.0.2 as
# fallbacks. Systemd also provides nss-mymachines to return IP
# addresses of local containers.
system.nssModules = [ config.systemd.package.out ];
system.nssModules = optionals canLoadExternalModules [ config.systemd.package.out ];
};
}