fbfe2907af
As announced in the NixOS 22.11 release notes, 23.05 will switch NixOS to using nsncd (a non-caching reimplementation in Rust) as NSS lookup dispatcher, instead of the buggy and deprecated glibc-provided nscd. If you need to switch back, set `services.nscd.enableNsncd = false`, but please open an issue in nixpkgs so your issue can be fixed.
142 lines
4.7 KiB
Nix
142 lines
4.7 KiB
Nix
import ./make-test-python.nix ({ pkgs, ... }:
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let
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# build a getent that itself doesn't see anything in /etc/hosts and
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# /etc/nsswitch.conf, by using libredirect to steer its own requests to
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# /dev/null.
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# This means is /has/ to go via nscd to actuallly resolve any of the
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# additionally configured hosts.
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getent' = pkgs.writeScript "getent-without-etc-hosts" ''
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export NIX_REDIRECTS=/etc/hosts=/dev/null:/etc/nsswitch.conf=/dev/null
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export LD_PRELOAD=${pkgs.libredirect}/lib/libredirect.so
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exec getent $@
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'';
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in
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{
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name = "nscd";
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nodes.machine = { pkgs, ... }: {
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imports = [ common/user-account.nix ];
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networking.extraHosts = ''
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2001:db8::1 somehost.test
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192.0.2.1 somehost.test
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'';
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systemd.services.sockdump = {
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wantedBy = [ "multi-user.target" ];
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path = [
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# necessary for bcc to unpack kernel headers and invoke modprobe
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pkgs.gnutar
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pkgs.xz.bin
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pkgs.kmod
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];
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environment.PYTHONUNBUFFERED = "1";
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serviceConfig = {
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ExecStart = "${pkgs.sockdump}/bin/sockdump /var/run/nscd/socket";
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Restart = "on-failure";
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RestartSec = "1";
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Type = "simple";
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};
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};
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specialisation = {
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withGlibcNscd.configuration = { ... }: {
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services.nscd.enableNsncd = false;
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};
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withUnscd.configuration = { ... }: {
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services.nscd.enableNsncd = false;
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services.nscd.package = pkgs.unscd;
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};
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};
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};
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testScript = { nodes, ... }:
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let
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specialisations = "${nodes.machine.system.build.toplevel}/specialisation";
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in
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''
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# Regression test for https://github.com/NixOS/nixpkgs/issues/50273
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def test_dynamic_user():
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with subtest("DynamicUser actually allocates a user"):
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assert "iamatest" in machine.succeed(
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"systemd-run --pty --property=Type=oneshot --property=DynamicUser=yes --property=User=iamatest whoami"
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)
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# Test resolution of somehost.test with getent', to make sure we go via
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# nscd protocol
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def test_host_lookups():
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with subtest("host lookups via nscd protocol"):
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# ahosts
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output = machine.succeed("${getent'} ahosts somehost.test")
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assert "192.0.2.1" in output
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assert "2001:db8::1" in output
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# ahostsv4
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output = machine.succeed("${getent'} ahostsv4 somehost.test")
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assert "192.0.2.1" in output
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assert "2001:db8::1" not in output
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# ahostsv6
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output = machine.succeed("${getent'} ahostsv6 somehost.test")
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assert "192.0.2.1" not in output
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assert "2001:db8::1" in output
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# reverse lookups (hosts)
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assert "somehost.test" in machine.succeed("${getent'} hosts 2001:db8::1")
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assert "somehost.test" in machine.succeed("${getent'} hosts 192.0.2.1")
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# Test host resolution via nss modules works
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# We rely on nss-myhostname in this case, which resolves *.localhost and
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# _gateway.
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# We don't need to use getent' here, as non-glibc nss modules can only be
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# discovered via nscd.
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def test_nss_myhostname():
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with subtest("nss-myhostname provides hostnames (ahosts)"):
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# ahosts
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output = machine.succeed("getent ahosts foobar.localhost")
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assert "::1" in output
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assert "127.0.0.1" in output
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# ahostsv4
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output = machine.succeed("getent ahostsv4 foobar.localhost")
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assert "::1" not in output
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assert "127.0.0.1" in output
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# ahostsv6
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output = machine.succeed("getent ahostsv6 foobar.localhost")
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assert "::1" in output
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assert "127.0.0.1" not in output
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start_all()
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machine.wait_for_unit("default.target")
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# give sockdump some time to finish attaching.
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machine.sleep(5)
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# Test all tests with glibc-nscd.
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test_dynamic_user()
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test_host_lookups()
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test_nss_myhostname()
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with subtest("glibc-nscd"):
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machine.succeed('${specialisations}/withGlibcNscd/bin/switch-to-configuration test')
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machine.wait_for_unit("default.target")
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test_dynamic_user()
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test_host_lookups()
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test_nss_myhostname()
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with subtest("unscd"):
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machine.succeed('${specialisations}/withUnscd/bin/switch-to-configuration test')
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machine.wait_for_unit("default.target")
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# known to fail, unscd doesn't load external NSS modules
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# test_dynamic_user()
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test_host_lookups()
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# known to fail, unscd doesn't load external NSS modules
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# test_nss_myhostname()
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'';
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})
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