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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:
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