units: introduce umount.target for unmounting all file systems

Makefile.am

@@ -126,6 +126,7 @@ dist_systemunit_DATA = \
 	units/rpcbind.target \
 	units/rtc-set.target \
 	units/shutdown.target \
+	units/umount.target \
 	units/sigpwr.target \
 	units/sockets.target \
 	units/swap.target \

fixme

@@ -35,8 +35,6 @@
 
 * selinux
 
-* introduce umount.target
-
 * pull in umount.target and shutdown.target from emergency.service (?)
 
 * Show exit status auf auxiliary programs in systemctl status

src/automount.c

@@ -36,6 +36,7 @@
 #include "unit-name.h"
 #include "dbus-automount.h"
 #include "bus-errors.h"
+#include "special.h"
 
 static const UnitActiveState state_translation_table[_AUTOMOUNT_STATE_MAX] = {
         [AUTOMOUNT_DEAD] = UNIT_INACTIVE,
@@ -194,6 +195,10 @@ static int automount_load(Unit *u) {
 
                 if ((r = unit_add_dependency(u, UNIT_BEFORE, UNIT(a->mount), true)) < 0)
                         return r;
+
+                if (a->meta.default_dependencies)
+                        if ((r = unit_add_two_dependencies_by_name(UNIT(a), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true)) < 0)
+                                return r;
         }
 
         return automount_verify(a);

src/mount.c

@@ -367,6 +367,10 @@ static int mount_load(Unit *u) {
 
                 if ((r = unit_add_default_cgroup(u)) < 0)
                         return r;
+
+                if (m->meta.default_dependencies && !path_equal(m->where, "/"))
+                        if ((r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true)) < 0)
+                                return r;
         }
 
         return mount_verify(m);

src/special.h

@@ -29,6 +29,7 @@
  * it to bring all services down that want to be brought down on
  * system shutdown. */
 #define SPECIAL_SHUTDOWN_TARGET "shutdown.target"
+#define SPECIAL_UMOUNT_TARGET "umount.target"
 
 #define SPECIAL_LOGGER_SOCKET "systemd-logger.socket"
 

units/umount.target

@@ -0,0 +1,12 @@
+#  This file is part of systemd.
+#
+#  systemd is free software; you can redistribute it and/or modify it
+#  under the terms of the GNU General Public License as published by
+#  the Free Software Foundation; either version 2 of the License, or
+#  (at your option) any later version.
+
+# See systemd.special(7) for details
+
+[Unit]
+Description=Unmount All Filesystems
+OnlyByDependency=yes