fix: avoid mistakenly create seat group on debian-based systems

seatd uses video group instead of seat group on debian-based systems, so
we need a specified version of sysuser.conf to avoid creating seat group
mistakenly.

Author: calsys456

services/CMakeLists.txt

@@ -1,9 +1,6 @@
 configure_file(ddm.service.in ddm.service)
 install(FILES "${CMAKE_CURRENT_BINARY_DIR}/ddm.service" DESTINATION "${SYSTEMD_SYSTEM_UNIT_DIR}")
 
-configure_file(ddm-sysuser.conf.in ddm-sysuser.conf)
-install(FILES "${CMAKE_CURRENT_BINARY_DIR}/ddm-sysuser.conf" DESTINATION "${SYSTEMD_SYSUSERS_DIR}" RENAME dde.conf)
-
 # systemd-tmpfiles can be used standalone without other systemd parts
 if(DEFINED SYSTEMD_TMPFILES_DIR)
     configure_file(ddm-tmpfiles.conf.in ddm-tmpfiles.conf)
@@ -12,6 +9,14 @@ endif()
 
 if(EXISTS "/etc/debian_version")
     install(FILES debian.ddm.pam DESTINATION ${CMAKE_INSTALL_FULL_SYSCONFDIR}/pam.d RENAME ddm)
+
+    # In debian-based systems, seatd uses video group instead of seat
+    # group, avoid creating seat group mistakenly by specifying
+    # different sysuser.conf
+    configure_file(debian.ddm-sysuser.conf.in debian.ddm-sysuser.conf)
+    install(FILES "${CMAKE_CURRENT_BINARY_DIR}/debian.ddm-sysuser.conf" DESTINATION "${SYSTEMD_SYSUSERS_DIR}" RENAME dde.conf)
 else()
     install(FILES ddm.pam DESTINATION ${CMAKE_INSTALL_FULL_SYSCONFDIR}/pam.d RENAME ddm)
+    configure_file(ddm-sysuser.conf.in ddm-sysuser.conf)
+    install(FILES "${CMAKE_CURRENT_BINARY_DIR}/ddm-sysuser.conf" DESTINATION "${SYSTEMD_SYSUSERS_DIR}" RENAME dde.conf)
 endif()

services/debian.ddm-sysuser.conf.in

@@ -0,0 +1,6 @@
+#Type Name ID GECOS                  Home directory Shell
+u     dde -  "DDM Greeter Account" ${STATE_DIR}   -
+g     dde -
+m     dde dde
+m     dde video
+m     dde render