Subject: [bug#63383] [PATCH 2/4] Drop limits.conf from /etc/security; use directly in pam-limits-service-type.

From: Felix Lechner <[email-masked]>
Date: Mon, 8 May 2023 17:58:07 -0700

This commit was tested and is already deployed in production.

* gnu/services/base.scm: Drop config file limits.conf from /etc; use absolute
path in store instead.
---
 gnu/services/base.scm | 59 ++++++++++++++++++++-----------------------
 1 file changed, 28 insertions(+), 31 deletions(-)

diff --git a/gnu/services/base.scm b/gnu/services/base.scm
index 4adb551796..16dcc55483 100644
--- a/gnu/services/base.scm
+++ b/gnu/services/base.scm
@@ -1608,36 +1608,34 @@ (define-deprecated (syslog-service #:optional (config (syslog-configuration)))
 
 (define pam-limits-service-type
   (let ((pam-extension
-         (lambda (pam)
-           (let ((pam-limits (pam-entry
-                              (control "required")
-                              (module "pam_limits.so")
-                              (arguments
-                               '("conf=/etc/security/limits.conf")))))
-             (if (member (pam-service-name pam)
-                         '("login" "greetd" "su" "slim" "gdm-password" "sddm"
-                           "sudo" "sshd"))
-                 (pam-service
-                  (inherit pam)
-                  (session (cons pam-limits
-                                 (pam-service-session pam))))
-                 pam))))
-
-        ;; XXX: Using file-like objects is deprecated, use lists instead.
-        ;;      This is to be reduced into the list? case when the deprecated
-        ;;      code gets removed.
-        ;; Create /etc/security containing the provided "limits.conf" file.
-        (security-limits
+         (lambda (limits-file)
+           (lambda (pam)
+             (let ((pam-limits (pam-entry
+                                (control "required")
+                                (module "pam_limits.so")
+                                (arguments
+                                 (list #~(string-append "conf=" #$limits-file))))))
+               (if (member (pam-service-name pam)
+                           '("login" "greetd" "su" "slim" "gdm-password" "sddm"
+                             "sudo" "sshd"))
+                   (pam-service
+                    (inherit pam)
+                    (session (cons pam-limits
+                                   (pam-service-session pam))))
+                   pam)))))
+        (make-limits-file
          (match-lambda
+           ;; XXX: Using file-like objects is deprecated, use lists instead.
+           ;;      This is to be reduced into the list? case when the deprecated
+           ;;      code gets removed.
            ((? file-like? obj)
             (warning (G_ "Using file-like value for \
 'pam-limits-service-type' is deprecated~%"))
-            `(("security/limits.conf" ,obj)))
+            obj)
            ((? list? lst)
-            `(("security/limits.conf"
-               ,(plain-file "limits.conf"
-                            (string-join (map pam-limits-entry->string lst)
-                                         "\n" 'suffix)))))
+            (plain-file "limits.conf"
+                        (string-join (map pam-limits-entry->string lst)
+                                     "\n" 'suffix)))
            (_ (raise
                (formatted-message
                 (G_ "invalid input for 'pam-limits-service-type'~%")))))))
@@ -1645,13 +1643,12 @@ (module "pam_limits.so")
     (service-type
      (name 'limits)
      (extensions
-      (list (service-extension etc-service-type security-limits)
-            (service-extension pam-root-service-type
-                               (lambda _ (list pam-extension)))))
+      (list (service-extension pam-root-service-type
+                               (lambda (config)
+                                 (list (pam-extension (make-limits-file config)))))))
      (description
-      "Install the specified resource usage limits by populating
-@file{/etc/security/limits.conf} and using the @code{pam_limits}
-authentication module.")
+      "Use the @code{pam_limits} authentication module to set the specified
+resource usage limits.")
      (default-value '()))))
 
 (define-deprecated (pam-limits-service #:optional (limits '()))
-- 
2.39.2