From 77f4e582d0f381391594e6f8a7b6767d572d96f7 Mon Sep 17 00:00:00 2001

From: Lennart Poettering <lennart@poettering.net>

Date: Tue, 19 May 2015 18:13:22 +0200

Subject: [PATCH] core: when propagating restart requests due to deps,

 downgrade restart to try-restart

Previously, if a service A depended on a service B via Requires=, and A

was not running and B restarted this would trigger a start of A as well,

since the restart was propagated as restart independently of the state

of A.

This patch ensures that a restart of B would be propagated as a

try-restart to A, thus not changing its state if it isn't up.

http://lists.freedesktop.org/archives/systemd-devel/2015-May/032061.html

(cherry picked from commit c6497ccb7153af9a1252c48918e380b5134314de)

Resolves: #1436021

---

 src/core/job.c         | 28 ++++++++++++++--------------

 src/core/job.h         |  2 +-

 src/core/manager.c     |  2 +-

 src/core/transaction.c | 11 ++++++++---

 4 files changed, 24 insertions(+), 19 deletions(-)

diff --git a/src/core/job.c b/src/core/job.c

index 703286496..1617e24c0 100644

--- a/src/core/job.c

+++ b/src/core/job.c

@@ -392,38 +392,38 @@ bool job_type_is_redundant(JobType a, UnitActiveState b) {

         }

 }

-void job_type_collapse(JobType *t, Unit *u) {

+JobType job_type_collapse(JobType t, Unit *u) {

         UnitActiveState s;

-        switch (*t) {

+        switch (t) {

         case JOB_TRY_RESTART:

                 s = unit_active_state(u);

                 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(s))

-                        *t = JOB_NOP;

-                else

-                        *t = JOB_RESTART;

-                break;

+                        return JOB_NOP;

+

+                return JOB_RESTART;

         case JOB_RELOAD_OR_START:

                 s = unit_active_state(u);

                 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(s))

-                        *t = JOB_START;

-                else

-                        *t = JOB_RELOAD;

-                break;

+                        return JOB_START;

+

+                return JOB_RELOAD;

         default:

-                ;

+                return t;

         }

 }

 int job_type_merge_and_collapse(JobType *a, JobType b, Unit *u) {

-        JobType t = job_type_lookup_merge(*a, b);

+        JobType t;

+

+        t = job_type_lookup_merge(*a, b);

         if (t < 0)

                 return -EEXIST;

-        *a = t;

-        job_type_collapse(a, u);

+

+        *a = job_type_collapse(t, u);

         return 0;

 }

diff --git a/src/core/job.h b/src/core/job.h

index e4191ee77..ce81607de 100644

--- a/src/core/job.h

+++ b/src/core/job.h

@@ -210,7 +210,7 @@ bool job_type_is_redundant(JobType a, UnitActiveState b) _pure_;

 /* Collapses a state-dependent job type into a simpler type by observing

  * the state of the unit which it is going to be applied to. */

-void job_type_collapse(JobType *t, Unit *u);

+JobType job_type_collapse(JobType t, Unit *u);

 int job_type_merge_and_collapse(JobType *a, JobType b, Unit *u);

diff --git a/src/core/manager.c b/src/core/manager.c

index 8bd80e687..287cf6a74 100644

--- a/src/core/manager.c

+++ b/src/core/manager.c

@@ -1303,7 +1303,7 @@ int manager_add_job(Manager *m, JobType type, Unit *unit, JobMode mode, bool ove

                        "Trying to enqueue job %s/%s/%s", unit->id,

                        job_type_to_string(type), job_mode_to_string(mode));

-        job_type_collapse(&type, unit);

+        type = job_type_collapse(type, unit);

         tr = transaction_new(mode == JOB_REPLACE_IRREVERSIBLY);

         if (!tr)

diff --git a/src/core/transaction.c b/src/core/transaction.c

index 428b7671b..34df15718 100644

--- a/src/core/transaction.c

+++ b/src/core/transaction.c

@@ -855,8 +855,7 @@ int transaction_add_job_and_dependencies(

         /*           by ? job_type_to_string(by->type) : "NA"); */

         if (!IN_SET(unit->load_state, UNIT_LOADED, UNIT_ERROR, UNIT_NOT_FOUND, UNIT_MASKED))

-                return sd_bus_error_setf(e, BUS_ERROR_LOAD_FAILED,

-                                         "Unit %s is not loaded properly.", unit->id);

+                return sd_bus_error_setf(e, BUS_ERROR_LOAD_FAILED, "Unit %s is not loaded properly.", unit->id);

         if (type != JOB_STOP) {

                 r = bus_unit_check_load_state(unit, e);

@@ -1014,12 +1013,18 @@ int transaction_add_job_and_dependencies(

                                 UNIT_CONSISTS_OF,

                         };

+                        JobType ptype;

                         unsigned j;

+                        /* We propagate STOP as STOP, but RESTART only

+                         * as TRY_RESTART, in order not to start

+                         * dependencies that are not around. */

+                        ptype = type == JOB_RESTART ? JOB_TRY_RESTART : type;

+

                         for (j = 0; j < ELEMENTSOF(propagate_deps); j++)

                                 SET_FOREACH(dep, ret->unit->dependencies[propagate_deps[j]], i) {

-                                        r = transaction_add_job_and_dependencies(tr, type, dep, ret, true, override, false, false, ignore_order, e);

+                                        r = transaction_add_job_and_dependencies(tr, job_type_collapse(ptype, dep), dep, ret, true, override, false, false, ignore_order, e);

                                         if (r < 0) {

                                                 if (r != -EBADR)

                                                         goto fail;