logrotate: move mail dependency from package to service

having pkgs.logrotate depend on mailutils brings in quite a bit of dependencies
through mailutil itself and recursive dependency to guile when most people
do not need it.

Remove mailutils dependency from the package, and conditionally add it to the
service if the user specify the mail option either at top level or in a path

Fixes #162001

nixos/modules/services/logging/logrotate.nix

@@ -97,12 +97,18 @@ let
   '';
 
   paths = sortProperties (attrValues (filterAttrs (_: pathOpts: pathOpts.enable) cfg.paths));
-  configFile = pkgs.writeText "logrotate.conf" (
-    concatStringsSep "\n" (
+  configText = concatStringsSep "\n" (
       [ "missingok" "notifempty" cfg.extraConfig ] ++ (map mkConf paths)
-    )
-  );
+    );
+  configFile = pkgs.writeText "logrotate.conf" configText;
 
+  mailOption =
+    # add mail option to service if a mail is requested in config
+    # this ugly match will be replaced by cleaner attribute check in
+    # the near future
+    if builtins.match "(.*[[:space:]])?mail[[:space:]].*" configText != null
+    then "--mail=${pkgs.mailutils}/bin/mail"
+    else "";
 in
 {
   imports = [
@@ -172,7 +178,7 @@ in
       serviceConfig = {
         Restart = "no";
         User = "root";
-        ExecStart = "${pkgs.logrotate}/sbin/logrotate ${configFile}";
+        ExecStart = "${pkgs.logrotate}/sbin/logrotate ${mailOption} ${configFile}";
       };
     };
   };

nixos/tests/logrotate.nix

@@ -1,26 +1,33 @@
 # Test logrotate service works and is enabled by default
 
-import ./make-test-python.nix ({ pkgs, ...} : rec {
+import ./make-test-python.nix ({ pkgs, ... }: rec {
   name = "logrotate";
   meta = with pkgs.lib.maintainers; {
     maintainers = [ martinetd ];
   };
 
-  # default machine
-  nodes.machine = { ... }: {
+  nodes = {
+    defaultMachine = { ... }: { };
+    machine = { config, ... }: {
+      services.logrotate.paths = {
+        # using mail somewhere should add --mail to logrotate invokation
+        sendmail = {
+          extraConfig = "mail user@domain.tld";
+        };
+      };
+    };
   };
 
   testScript =
     ''
       with subtest("whether logrotate works"):
-          machine.succeed(
-              # we must rotate once first to create logrotate stamp
-              "systemctl start logrotate.service")
+          # we must rotate once first to create logrotate stamp
+          defaultMachine.succeed("systemctl start logrotate.service")
           # we need to wait for console text once here to
           # clear console buffer up to this point for next wait
-          machine.wait_for_console_text('logrotate.service: Deactivated successfully')
+          defaultMachine.wait_for_console_text('logrotate.service: Deactivated successfully')
 
-          machine.succeed(
+          defaultMachine.succeed(
               # wtmp is present in default config.
               "rm -f /var/log/wtmp*",
               # we need to give it at least 1MB
@@ -28,10 +35,14 @@ import ./make-test-python.nix ({ pkgs, ...} : rec {
 
               # move into the future and check rotation.
               "date -s 'now + 1 month + 1 day'")
-          machine.wait_for_console_text('logrotate.service: Deactivated successfully')
-          machine.succeed(
+          defaultMachine.wait_for_console_text('logrotate.service: Deactivated successfully')
+          defaultMachine.succeed(
               # check rotate worked
               "[ -e /var/log/wtmp.1 ]",
           )
+      with subtest("default config does not have mail"):
+          defaultMachine.fail("systemctl cat logrotate.service | grep -- --mail")
+      with subtest("using mails adds mail option"):
+          machine.succeed("systemctl cat logrotate.service | grep -- --mail")
     '';
 })

pkgs/tools/system/logrotate/default.nix

@@ -1,5 +1,4 @@
 { lib, stdenv, fetchFromGitHub, gzip, popt, autoreconfHook
-, mailutils ? null
 , aclSupport ? true, acl
 , nixosTests
 }:
@@ -19,8 +18,6 @@ stdenv.mkDerivation rec {
   configureFlags = [
     "--with-compress-command=${gzip}/bin/gzip"
     "--with-uncompress-command=${gzip}/bin/gunzip"
-  ] ++ lib.optionals (mailutils != null) [
-    "--with-default-mail-command=${mailutils}/bin/mail"
   ];
 
   nativeBuildInputs = [ autoreconfHook ];