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From c55a7f9448378c10a7e8074db908502ae5ff60aa Mon Sep 17 00:00:00 2001
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From: Franck Bui <fbui@suse.com>
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Date: Fri, 13 Nov 2015 14:12:19 +0100
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Subject: [PATCH] Introduce bus_unit_check_load_state() helper
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This function is used to check that a previous unit load succeed and
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returns 0 in this case.
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In the case the load failed, the function setup a bus error
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accordingly and returns -errno.
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(cherry picked from commit 000a996dc46c187f803b67b0b0d51ad4d0bc1658)
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Related: #1256858
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---
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 src/core/dbus-unit.c | 17 +++++++++++++++++
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 src/core/dbus-unit.h |  2 ++
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 2 files changed, 19 insertions(+)
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diff --git a/src/core/dbus-unit.c b/src/core/dbus-unit.c
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index 49770bfda1..c3654db9ea 100644
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--- a/src/core/dbus-unit.c
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+++ b/src/core/dbus-unit.c
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@@ -1083,3 +1083,20 @@ int bus_unit_set_properties(
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         return n;
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 }
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+
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+int bus_unit_check_load_state(Unit *u, sd_bus_error *error) {
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+
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+        if (u->load_state == UNIT_LOADED)
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+                return 0;
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+
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+        /* Give a better description of the unit error when
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+         * possible. Note that in the case of UNIT_MASKED, load_error
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+         * is not set. */
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+        if (u->load_state == UNIT_MASKED)
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+                return sd_bus_error_setf(error, BUS_ERROR_UNIT_MASKED, "Unit is masked.");
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+
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+        if (u->load_state == UNIT_NOT_FOUND)
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+                return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_UNIT, "Unit not found.");
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+
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+        return sd_bus_error_set_errnof(error, u->load_error, "Unit is not loaded properly: %m.");
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+}
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diff --git a/src/core/dbus-unit.h b/src/core/dbus-unit.h
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index 57a5e19744..433849641e 100644
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--- a/src/core/dbus-unit.h
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+++ b/src/core/dbus-unit.h
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@@ -37,3 +37,5 @@ int bus_unit_method_reset_failed(sd_bus *bus, sd_bus_message *message, void *use
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 int bus_unit_queue_job(sd_bus *bus, sd_bus_message *message, Unit *u, JobType type, JobMode mode, bool reload_if_possible, sd_bus_error *error);
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 int bus_unit_set_properties(Unit *u, sd_bus_message *message, UnitSetPropertiesMode mode, bool commit, sd_bus_error *error);
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 int bus_unit_method_set_properties(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error);
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+
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+int bus_unit_check_load_state(Unit *u, sd_bus_error *error);