From 469d48cf685bd0157fa44ff7ebd3bd0302746ab0 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Mon, 18 Aug 2014 22:21:42 +0200
Subject: [PATCH] units: fix BindsTo= logic when applied relative to services
 with Type=oneshot
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Start jobs for Type=oneshot units are successful when the unit state
transition activating → inactive took place. In such a case all units
that BindsTo= on it previously would continue to run, even though the unit
they dependet on was actually already gone.

(cherry-picked from ff50244582bf69e8489bba6ce59a21663d7f8274)

Resolves: #1147524
---
 src/core/unit.c | 48 ++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 44 insertions(+), 4 deletions(-)

diff --git a/src/core/unit.c b/src/core/unit.c
index b51e351..f221b9a 100644
--- a/src/core/unit.c
+++ b/src/core/unit.c
@@ -1302,12 +1302,44 @@ static void unit_check_unneeded(Unit *u) {
                 if (unit_active_or_pending(other))
                         return;
 
-        log_info_unit(u->id, "Service %s is not needed anymore. Stopping.", u->id);
+        log_info_unit(u->id, "Unit %s is not needed anymore. Stopping.", u->id);
 
         /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
         manager_add_job(u->manager, JOB_STOP, u, JOB_FAIL, true, NULL, NULL);
 }
 
+static void unit_check_binds_to(Unit *u) {
+        bool stop = false;
+        Unit *other;
+        Iterator i;
+
+        assert(u);
+
+        if (u->job)
+                return;
+
+        if (unit_active_state(u) != UNIT_ACTIVE)
+                return;
+
+        SET_FOREACH(other, u->dependencies[UNIT_BINDS_TO], i) {
+                if (other->job)
+                        continue;
+
+                if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other)))
+                        continue;
+
+                stop = true;
+        }
+
+        if (!stop)
+                return;
+
+        log_info_unit(u->id, "Unit %s is bound to inactive service. 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);
+}
+
 static void retroactively_start_dependencies(Unit *u) {
         Iterator i;
         Unit *other;
@@ -1611,11 +1643,19 @@ void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns, bool reload_su
         manager_recheck_journal(m);
         unit_trigger_notify(u);
 
-        /* Maybe we finished startup and are now ready for being
-         * stopped because unneeded? */
-        if (u->manager->n_reloading <= 0)
+        if (u->manager->n_reloading <= 0) {
+                /* Maybe we finished startup and are now ready for
+                 * being stopped because unneeded? */
                 unit_check_unneeded(u);
 
+                /* Maybe we finished startup, but something we needed
+                 * has vanished? Let's die then. (This happens when
+                 * something BindsTo= to a Type=oneshot unit, as these
+                 * units go directly from starting to inactive,
+                 * without ever entering started.) */
+                unit_check_binds_to(u);
+        }
+
         unit_add_to_dbus_queue(u);
         unit_add_to_gc_queue(u);
 }