system: pam: Let PAM extensions add shepherd requirements.

* gnu/system/pam.scm (<pam-extension>): New record type.
(pam-shepherd-service): Add Shepherd synchronization point.

* gnu/services/mail.scm (dovecot-shepherd-service)
* gnu/services/lightdm.scm (lightdm-shepherd-service)
* gnu/services/mail.scm (opensmtpd-shepherd-service)
* gnu/services/sddm.scm (sddm-shepherd-service)
* gnu/services/ssh.scm (lsh-shepherd-service, openssh-shepherd-service)
* gnu/services/xorg.scm (slim-shepherd-service, gdm-shepherd-service)
* gnu/services/base.scm (greetd-shepherd-services): Add PAM requirement.

* gnu/system/pam.scm (/etc-entry, extend-configuration,
pam-root-service-type, pam-root-service)
* gnu/services/authentication.scm (pam-ldap-pam-service)
* gnu/services/base.scm (pam-limits-service-type)
(greetd-pam-service)
* gnu/services/desktop.scm (pam-gnome-keyring)
* gnu/services/kerberos.scm (pam-krb5-pam-service)
* gnu/services/pam-mount.scm (pam-mount-pam-service): Adapt to use
pam-extension.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/gnu/services/sddm.scm b/gnu/services/sddm.scm
index 9e02f1cc81..c9a7ba96f4 100644
--- a/gnu/services/sddm.scm
+++ b/gnu/services/sddm.scm
@@ -169,7 +169,7 @@ Relogin="              (if (sddm-configuration-relogin? config)
 
   (list (shepherd-service
          (documentation "SDDM display manager.")
-         (requirement '(user-processes elogind))
+         (requirement '(user-processes elogind pam))
          (provision '(xorg-server display-manager))
          (start #~(make-forkexec-constructor #$sddm-command))
          (stop #~(make-kill-destructor)))))