[bug#49969] [PATCH v2 4/7] gnu: admin: Add greetd-pam-mount

[muradm]

This package inherits pam-mount in the way that it is compiled
specifically for use with greetd daemon. It uses different
configuration location and name space for storing data in PAM.

greetd-pam-mount is used in configuration of greetd to provide
auto-(mounting/unmounting) of XDG_RUNTIME_DIR in the way that
it will not interfere with default pam-mount configuration.

* gnu/packages/admin.scm (greetd-pam-mount): Add greetd-pam-mount
---
 gnu/packages/admin.scm | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/gnu/packages/admin.scm b/gnu/packages/admin.scm
index eda269f148..e805b219c5 100644
--- a/gnu/packages/admin.scm
+++ b/gnu/packages/admin.scm
@@ -42,6 +42,7 @@
 ;;; Copyright © 2021 David Larsson <david.larsson@selfhosted.xyz>
 ;;; Copyright © 2021 WinterHound <winterhound@yandex.com>
 ;;; Copyright © 2021 Brice Waegeneire <brice@waegenei.re>
+;;; Copyright © 2021 muradm <mail@muradm.net>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -4247,6 +4248,25 @@ supports.  It can also mount encrypted LUKS volumes 
using the password
 supplied by the user when logging in.")
     (license (list license:gpl2+ license:lgpl2.1+))))
 
+(define-public greetd-pam-mount
+  (package
+    (inherit pam-mount)
+    (name "greetd-pam-mount")
+    (arguments
+     (substitute-keyword-arguments (package-arguments pam-mount)
+       ((#:configure-flags flags ''())
+        `(cons* "--with-rundir=/run/greetd" ,flags))
+       ((#:phases phases)
+        `(modify-phases ,phases
+           (add-after 'unpack 'patch-config-file-name
+             (lambda* (#:key inputs #:allow-other-keys)
+               (substitute* "src/pam_mount.c"
+                 ((".*define CONFIGFILE .*$")
+                  "#define CONFIGFILE 
\"/etc/security/greetd_pam_mount.conf.xml\"\n")
+                 (("pam_mount_config") "greetd_pam_mount_config")
+                 (("pam_mount_system_authtok") 
"greetd_pam_mount_system_authtok"))))))))
+    (synopsis "pam-mount specifically compiled for use with greetd")))
+
 (define-public jc
   (package
     (name "jc")
-- 
2.32.0