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From 71c1119e2fe9bc57e0efb07f784f616a98763028 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Renaud=20M=C3=A9trich?= <rmetrich@redhat.com>
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Date: Fri, 2 Oct 2020 17:30:35 +0200
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Subject: [PATCH] unit: don't emit PropertiesChanged signal if adding a
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 dependency to a unit is a no-op
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(cherry-picked from commit 5177cb0a9add4ae568cff6e6f7c2b3c77760c343)
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Related: #1793527
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---
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 src/core/unit.c | 16 +++++++++++++---
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 1 file changed, 13 insertions(+), 3 deletions(-)
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diff --git a/src/core/unit.c b/src/core/unit.c
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index 18b1b898fd..e07c34bfc5 100644
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--- a/src/core/unit.c
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+++ b/src/core/unit.c
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@@ -2260,6 +2260,9 @@ int unit_add_dependency(Unit *u, UnitDependency d, Unit *other, bool add_referen
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         };
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         int r, q = 0, v = 0, w = 0;
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         Unit *orig_u = u, *orig_other = other;
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+        /* Helper to know whether sending a notification is necessary or not:
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+         * if the dependency is already there, no need to notify! */
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+        bool noop = true;
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         assert(u);
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         assert(d >= 0 && d < _UNIT_DEPENDENCY_MAX);
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@@ -2298,13 +2301,16 @@ int unit_add_dependency(Unit *u, UnitDependency d, Unit *other, bool add_referen
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         q = set_put(u->dependencies[d], other);
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         if (q < 0)
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                 return q;
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+        else if (q > 0)
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+                noop = false;
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         if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID && inverse_table[d] != d) {
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                 v = set_put(other->dependencies[inverse_table[d]], u);
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                 if (v < 0) {
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                         r = v;
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                         goto fail;
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-                }
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+                } else if (v > 0)
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+                        noop = false;
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         }
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         if (add_reference) {
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@@ -2312,14 +2318,18 @@ int unit_add_dependency(Unit *u, UnitDependency d, Unit *other, bool add_referen
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                 if (w < 0) {
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                         r = w;
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                         goto fail;
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-                }
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+                } else if (w > 0)
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+                        noop = false;
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                 r = set_put(other->dependencies[UNIT_REFERENCED_BY], u);
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                 if (r < 0)
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                         goto fail;
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+                else if (r > 0)
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+                        noop = false;
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         }
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-        unit_add_to_dbus_queue(u);
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+        if (!noop)
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+                unit_add_to_dbus_queue(u);
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         return 0;
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 fail: