unit: use weaker dependencies between mount and device units in --user mode

[elogind.git] / src / core / unit.c

diff --git a/src/core/unit.c b/src/core/unit.c
index 229bd0f73ad56b20a0ecc3e71f7e838d6ff7d2cb..875befa0a200e5ce83771316be36c8561009e8be 100644 (file)
--- a/src/core/unit.c
+++ b/src/core/unit.c
@@ -19,12 +19,8 @@
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/
 
-#include <assert.h>
 #include <errno.h>
 #include <string.h>
-#include <sys/epoll.h>
-#include <sys/timerfd.h>
-#include <sys/poll.h>
 #include <stdlib.h>
 #include <unistd.h>
 #include <sys/stat.h>
@@ -45,12 +41,10 @@
 #include "cgroup-util.h"
 #include "missing.h"
 #include "mkdir.h"
-#include "label.h"
 #include "fileio-label.h"
 #include "bus-common-errors.h"
 #include "dbus.h"
 #include "execute.h"
-#include "virt.h"
 #include "dropin.h"
 
 const UnitVTable * const unit_vtable[_UNIT_TYPE_MAX] = {
@@ -278,21 +272,32 @@ int unit_set_description(Unit *u, const char *description) {
 }
 
 bool unit_check_gc(Unit *u) {
+        UnitActiveState state;
         assert(u);
 
-        if (UNIT_VTABLE(u)->no_gc)
+        if (u->job)
                 return true;
 
-        if (u->no_gc)
+        if (u->nop_job)
                 return true;
 
-        if (u->job)
+        state = unit_active_state(u);
+
+        /* If the unit is inactive and failed and no job is queued for
+         * it, then release its runtime resources */
+        if (UNIT_IS_INACTIVE_OR_FAILED(state) &&
+            UNIT_VTABLE(u)->release_resources)
+                UNIT_VTABLE(u)->release_resources(u);
+
+        /* But we keep the unit object around for longer when it is
+         * referenced or configured to not be gc'ed */
+        if (state != UNIT_INACTIVE)
                 return true;
 
-        if (u->nop_job)
+        if (UNIT_VTABLE(u)->no_gc)
                 return true;
 
-        if (unit_active_state(u) != UNIT_INACTIVE)
+        if (u->no_gc)
                 return true;
 
         if (u->refs)
@@ -857,7 +862,7 @@ void unit_dump(Unit *u, FILE *f, const char *prefix) {
         assert(u->type >= 0);
 
         prefix = strempty(prefix);
-        prefix2 = strappenda(prefix, "\t");
+        prefix2 = strjoina(prefix, "\t");
 
         fprintf(f,
                 "%s-> Unit %s:\n"
@@ -1388,7 +1393,6 @@ static void unit_status_log_starting_stopping_reloading(Unit *u, JobType t) {
 
         DISABLE_WARNING_FORMAT_NONLITERAL;
         snprintf(buf, sizeof(buf), format, unit_description(u));
-        char_array_0(buf);
         REENABLE_WARNING;
 
         mid = t == JOB_START ? SD_MESSAGE_UNIT_STARTING :
@@ -1412,6 +1416,7 @@ static void unit_status_log_starting_stopping_reloading(Unit *u, JobType t) {
 int unit_start(Unit *u) {
         UnitActiveState state;
         Unit *following;
+        int r;
 
         assert(u);
 
@@ -1450,9 +1455,6 @@ int unit_start(Unit *u) {
                 return unit_start(following);
         }
 
-        unit_status_log_starting_stopping_reloading(u, JOB_START);
-        unit_status_print_starting_stopping(u, JOB_START);
-
         if (UNIT_VTABLE(u)->supported && !UNIT_VTABLE(u)->supported(u->manager))
                 return -ENOTSUP;
 
@@ -1468,7 +1470,14 @@ int unit_start(Unit *u) {
 
         unit_add_to_dbus_queue(u);
 
-        return UNIT_VTABLE(u)->start(u);
+        r = UNIT_VTABLE(u)->start(u);
+        if (r <= 0)
+                return r;
+
+        /* Log if the start function actually did something */
+        unit_status_log_starting_stopping_reloading(u, JOB_START);
+        unit_status_print_starting_stopping(u, JOB_START);
+        return r;
 }
 
 bool unit_can_start(Unit *u) {
@@ -1492,6 +1501,7 @@ bool unit_can_isolate(Unit *u) {
 int unit_stop(Unit *u) {
         UnitActiveState state;
         Unit *following;
+        int r;
 
         assert(u);
 
@@ -1505,15 +1515,18 @@ int unit_stop(Unit *u) {
                 return unit_stop(following);
         }
 
-        unit_status_log_starting_stopping_reloading(u, JOB_STOP);
-        unit_status_print_starting_stopping(u, JOB_STOP);
-
         if (!UNIT_VTABLE(u)->stop)
                 return -EBADR;
 
         unit_add_to_dbus_queue(u);
 
-        return UNIT_VTABLE(u)->stop(u);
+        r = UNIT_VTABLE(u)->stop(u);
+        if (r <= 0)
+                return r;
+
+        unit_status_log_starting_stopping_reloading(u, JOB_STOP);
+        unit_status_print_starting_stopping(u, JOB_STOP);
+        return r;
 }
 
 /* Errors:
@@ -1524,6 +1537,7 @@ int unit_stop(Unit *u) {
 int unit_reload(Unit *u) {
         UnitActiveState state;
         Unit *following;
+        int r;
 
         assert(u);
 
@@ -1548,10 +1562,14 @@ int unit_reload(Unit *u) {
                 return unit_reload(following);
         }
 
-        unit_status_log_starting_stopping_reloading(u, JOB_RELOAD);
-
         unit_add_to_dbus_queue(u);
-        return UNIT_VTABLE(u)->reload(u);
+
+        r = UNIT_VTABLE(u)->reload(u);
+        if (r <= 0)
+                return r;
+
+        unit_status_log_starting_stopping_reloading(u, JOB_RELOAD);
+        return r;
 }
 
 bool unit_can_reload(Unit *u) {
@@ -1629,7 +1647,7 @@ static void unit_check_binds_to(Unit *u) {
         if (!stop)
                 return;
 
-        log_unit_info(u->id, "Unit %s is bound to inactive service. Stopping, too.", u->id);
+        log_unit_info(u->id, "Unit %s is bound to inactive unit. Stopping, too.", u->id);
 
         /* A unit we need to run is gone. Sniff. Let's stop this. */
         manager_add_job(u->manager, JOB_STOP, u, JOB_FAIL, true, NULL, NULL);
@@ -2821,7 +2839,7 @@ int unit_add_node_link(Unit *u, const char *what, bool wants) {
         if (r < 0)
                 return r;
 
-        r = unit_add_two_dependencies(u, UNIT_AFTER, UNIT_BINDS_TO, device, true);
+        r = unit_add_two_dependencies(u, UNIT_AFTER, u->manager->running_as == SYSTEMD_SYSTEM ? UNIT_BINDS_TO : UNIT_WANTS, device, true);
         if (r < 0)
                 return r;
 
@@ -3154,6 +3172,10 @@ int unit_patch_contexts(Unit *u) {
                         r = get_home_dir(&ec->working_directory);
                         if (r < 0)
                                 return r;
+
+                        /* Allow user services to run, even if the
+                         * home directory is missing */
+                        ec->working_directory_missing_ok = true;
                 }
 
                 if (u->manager->running_as == SYSTEMD_USER &&