Fixes <https://issues.guix.gnu.org/76368>.

* gnu/services/auditd.scm (auditd-shepherd-service):
* gnu/services/base.scm (rngd-service-type):
(gpm-shepherd-service):
* gnu/services/ci.scm (laminar-shepherd-service):
* gnu/services/containers.scm (rootless-podman-cgroups-fs-owner-service):
(rootless-podman-cgroups-limits-service):
* gnu/services/cups.scm (cups-shepherd-service):
* gnu/services/databases.scm (postgresql-role-shepherd-service):
* gnu/services/desktop.scm (upower-shepherd-service):
(bluetooth-shepherd-service):
(elogind-shepherd-service):
(inputattach-shepherd-service):
(seatd-shepherd-service):
* gnu/services/dns.scm (knot-resolver-shepherd-services):
(dnsmasq-shepherd-service):
* gnu/services/docker.scm (containerd-shepherd-service):
(docker-shepherd-service):
* gnu/services/file-sharing.scm (transmission-daemon-shepherd-service):
* gnu/services/games.scm (joycond-shepherd-service):
(wesnothd-shepherd-service):
* gnu/services/guix.scm (guix-build-coordinator-shepherd-services):
(guix-data-service-shepherd-services):
(nar-herder-shepherd-services):
(bffe-shepherd-services):
* gnu/services/ldap.scm (directory-server-shepherd-service):
* gnu/services/linux.scm (cachefilesd-shepherd-service):
(rasdaemon-shepherd-service):
* gnu/services/mail.scm (dovecot-shepherd-service):
(imap4d-shepherd-service):
(radicale-shepherd-service):
(rspamd-configuration):
* gnu/services/monitoring.scm (prometheus-node-exporter-shepherd-service):
(vnstat-shepherd-service):
* gnu/services/networking.scm (opendht-shepherd-service):
(openvswitch-shepherd-service):
(pagekite-shepherd-service):
(ipfs-shepherd-service):
* gnu/services/nfs.scm (rpcbind-service-type):
(gss-service-type):
(idmap-service-type):
* gnu/services/pm.scm (thermald-shepherd-service):
* gnu/services/rsync.scm (rsync-shepherd-service):
* gnu/services/samba.scm (samba-samba-shepherd-service):
(samba-nmbd-shepherd-service):
(samba-smbd-shepherd-service):
(samba-winbindd-shepherd-service):
(wsdd-shepherd-service):
* gnu/services/security-token.scm (pcscd-shepherd-service):
* gnu/services/sound.scm (speakersafetyd-shepherd-service):
* gnu/services/spice.scm (spice-vdagent-shepherd-service):
* gnu/services/ssh.scm (lsh-shepherd-service):
(openssh-shepherd-service):
(dropbear-shepherd-service):
(autossh-shepherd-service):
* gnu/services/telephony.scm (jami-shepherd-services):
(mumble-server-shepherd-service):
* gnu/services/version-control.scm (git-daemon-shepherd-service):
* gnu/services/virtualization.scm (virtlogd-shepherd-service):
* gnu/services/vnc.scm (xvnc-shepherd-service):
* gnu/services/vpn.scm (openvpn-shepherd-service):
(strongswan-shepherd-service):
* gnu/services/web.scm (httpd-shepherd-services):
(fcgiwrap-shepherd-service):
(php-fpm-shepherd-service):
(hpcguix-web-shepherd-service):
(tailon-shepherd-service):
(varnish-shepherd-service):
(whoogle-shepherd-service):
(mumi-shepherd-services):
(gmnisrv-shepherd-service):
(agate-shepherd-service): Add ‘user-processes’ requirement.
* doc/guix.texi (Mail Services): Update accordingly.

Reported-by: Dariqq <dariqq@posteo.net>
Change-Id: I947bd2afc83b786cb17c555cfe73ab586b806618

* doc/guix.texi (Miscellaneous Services): Replace 'spice-vdagent-service' with
'spice-vdagent-service-type'. Document <spice-vdagent-configuration>.
* gnu/services/spice.scm (spice-vdagent-service): Deprecate procedure.

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

* gnu/services/databases.scm (postgresql-service-type)[description]: New field.
(memcached-service-type)[description]: New field.
(mysql-service-type)[description]: New field.
(redis-service-type)[description]: New field.
* gnu/services/desktop.scm (geoclue-service-type)[description]: New
field.
(udisks-service-type)[description]: New field.
(elogind-service-type)[description]: New field.
(account-service-type)[description]: New field.
* gnu/services/kerberos.scm (krb5-service-type)[description]: New field.
(pam-krb5-service-type)[description]: New field.
* gnu/services/lirc.scm (lirc-service-type)[description]: New field.
* gnu/services/mail.scm (dovecot-service-type)[description]: New field.
(opensmtpd-service-type)[description]: New field.
(mail-aliases-service-type)[description]: New field.
(exim-service-type)[description]: New field.
* gnu/services/monitoring.scm (zabbix-server-service-type)[description]:
New field.
(zabbix-agent-service-type)[description]: New field.
* gnu/services/nfs.scm (rpcbind-service-type)[description]: New field.
(pipefs-service-type)[description]: New field.
(gss-service-type)[description]: New field.
(idmap-service-type)[description]: New field.
* gnu/services/spice.scm (spice-vdagent-service-type)[description]: New field.
* gnu/services/sysctl.scm (sysctl-service-type)[description]: New field.
* gnu/services/virtualization.scm (libvirt-service-type)[description]:
New field.
(virtlog-service-type)[description]: New field.
* gnu/services/vpn.scm (openvpn-server-service-type)[description]: New field.
(openvpn-client-service-type)[description]: New field.
(wireguard-service-type)[description]: New field.
* gnu/services/web.scm (httpd-service-type)[description]: New field.
(fcgiwrap-service-type)[description]: New field.
(agate-service-type)[description]: New field.
[name]: Fix.

This fixes the following issue where spice-vdagent would fail to start if the
spice-vdagent-sock socket file already existed:

  spice-vdagentd: Fatal could not create the server socket
  /run/spice-vdagentd/spice-vdagent-sock: Error binding to address: Address
  already in use

The requirement is also modified to depend on dbus-system, a cue taken from
upstream's own systemd service file (see 'data/spice-vdagentd.service' in the
sources).

* gnu/services/spice.scm (spice-vdagent-activation): Delete procedure.
(spice-vdagent-shepherd-service): Fix indentation.
[requirement]: Replace udev by dbus-system.
[start]: Ensure the spice-vdagentd run-time directory exists and that the
spice-vdagent-sock socket file does *not* exist before forking the daemon.

* gnu/services/spice.scm (spice-vdagent-activation): Update runtime directory
from /var/run/spice-vdagentd to /run/spice-vdagentd.
(spice-vdagent-service-type): Specify a default value and fix indentation.

Passing 'make-forkexec-constructor' a string or several string arguments
has been deprecated since dmd 0.1.

* gnu/services/base.scm (rngd-service-type): In 'start' method, pass a
list as the first argument to 'make-forkexec-constructor'.
* gnu/services/desktop.scm (bluetooth-shepherd-service): Likewise.
* gnu/services/spice.scm (spice-vdagent-shepherd-service): Likewise.

* gnu/services/spice.scm (spice-vdagent-service): Fix typo.

Signed-off-by: Danny Milosavljevic <dannym@scratchpost.org>

* gnu/services/cups.scm (%cups-activation): Import (guix build utils).
* gnu/services/mail.scm (opensmtpd-activation): Idem.
* gnu/services/networking.scm (ntp-service-activation): Idem.
* gnu/services/spice.scm (spice-vdagent-activation): Idem.
* gnu/services/ssh.scm (openssh-activation): Idem.
  (dropbear-activation): Idem.
* gnu/services/vpn.scm (%openvpn-activation): Idem.

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

* gnu/services/avahi.scm, gnu/services/base.scm,
gnu/services/databases.scm, gnu/services/dbus.scm,
gnu/services/desktop.scm, gnu/services/dict.scm,
gnu/services/mail.scm, gnu/services/networking.scm,
gnu/services/sddm.scm, gnu/services/spice.scm,
gnu/services/ssh.scm, gnu/services/web.scm,
gnu/services/xorg.scm, gnu/system.scm: Replace the
 #~(string-append #$pkg "/bin/foo") idiom with
 (file-append pkg "/bin/foo").

* gnu/services/spice.scm: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add it.
* doc/guix.texi (Various Services): New subheading.