ncm-nss: replace LC::Check with FileWriter

Use FileWriter instead of LC::Check and add a simple unit test of the
behaviour.

ncm-nss/src/main/perl/nss.pm

@@ -95,16 +95,16 @@ sub Configure {
 
     my @new = ( "# Generated by ncm-nss\n\n" );
     push(@new, map { "$_: $databases->{$_}\n" } sort keys %$databases);
-    my $contents = join("", @new);
-    # cannot use CAF::FileWriter because close() always returns false in
-    # noaction mode so cannot show when nscd would be restarted
-    my $result = LC::Check::file("/etc/nsswitch.conf",
-                                 backup => ".OLD",
-                                 contents => $contents,
-                                 owner => "root",
-                                 group => "root",
-                                 mode => "0444",
-                                );
+    my $fh = CAF::FileWriter->open("/etc/nsswitch.conf",
+                                   backup => ".OLD",
+                                   owner => "root",
+                                   group => "root",
+                                   mode => "0444",
+                                   log => $self,
+        );
+    print $fh join("", @new);
+    my $result = $fh->close();
+
     if ($result) {
         $self->log("updated /etc/nsswitch.conf");
 

ncm-nss/src/test/perl/configure.t

@@ -0,0 +1,37 @@
+#!/usr/bin/perl
+# -*- mode: cperl -*-
+use strict;
+use warnings;
+
+use Test::More;
+use Test::Quattor qw(simple);
+use NCM::Component::sysctl;
+use Test::MockModule;
+use CAF::Object;
+
+$CAF::Object::NoAction = 1;
+
+my $mock = Test::MockModule->new('NCM::Component::nss');
+
+=pod
+
+=head1 DESCRIPTION
+
+Test the configure() method.
+
+=cut
+
+my $cmp = NCM::Component::nss->new('nss');
+my $cfg = get_config_for_profile('simple');
+my $testfile = "/etc/nsswitch.conf";
+my $testcmd = "/usr/sbin/buildldap -d passwd";
+
+is($cmp->Configure($cfg), 1, "Configure succeeds");
+my $fh = get_file($testfile);
+ok($fh, "$testfile was created");
+isa_ok($fh, "CAF::FileWriter");
+like("$fh", qr{^passwd: files ldap$}m, "passwd line present and correct");
+ok(defined(get_command($testcmd)), "$testcmd was run");
+ok(!defined(get_command('/usr/sbin/builddb')), "inactive db was not built");
+
+done_testing();

ncm-nss/src/test/resources/simple.pan

@@ -0,0 +1,15 @@
+object template simple;
+
+#function pkg_repl = { null; };
+#include 'components/nss/config';
+#"/software/components/nss/dependencies/pre" = null;
+
+prefix "/software/components/nss";
+"databases/passwd" = list("files", "ldap");
+"build/ldap/script" = "/usr/sbin/buildldap -d <DB>";
+"build/ldap/active" = true;
+"build/db/script" = "/usr/sbin/builddb";
+# active has a de-facto value of false in the code
+#"build/db/active" = false;
+
+