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From a46d3732a4f8baacf1be3e5e0ac152119fe26d4c 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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Resolves: #1948480
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---
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src/core/unit.c | 14 +++++++++++++-
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1 file changed, 13 insertions(+), 1 deletion(-)
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diff --git a/src/core/unit.c b/src/core/unit.c
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index 68affa2c0e..e3e534ea2e 100644
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--- a/src/core/unit.c
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+++ b/src/core/unit.c
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@@ -2818,6 +2818,9 @@ int unit_add_dependency(
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};
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Unit *original_u = u, *original_other = other;
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int r;
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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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@@ -2842,24 +2845,33 @@ int unit_add_dependency(
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r = unit_add_dependency_hashmap(u->dependencies + d, other, mask, 0);
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if (r < 0)
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return r;
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+ else if (r > 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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r = unit_add_dependency_hashmap(other->dependencies + inverse_table[d], u, 0, mask);
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if (r < 0)
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return r;
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+ else if (r > 0)
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+ noop = false;
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}
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if (add_reference) {
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r = unit_add_dependency_hashmap(u->dependencies + UNIT_REFERENCES, other, mask, 0);
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if (r < 0)
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return r;
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+ else if (r > 0)
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+ noop = false;
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r = unit_add_dependency_hashmap(other->dependencies + UNIT_REFERENCED_BY, u, 0, mask);
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if (r < 0)
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return r;
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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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}
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