core: add dbus-util.[ch] to simplify creating transient units

The functions and macros introduced by them will be used in later commits.

1 files changed, 119 insertions, 0 deletions

diff --git a/src/core/dbus-util.c b/src/core/dbus-util.c
new file mode 100644
index 0000000000..ed83a0e5f4
--- /dev/null
+++ b/src/core/dbus-util.c
@@ -0,0 +1,119 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+/***
+  This file is part of systemd.
+
+  Copyright 2010 Lennart Poettering
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include "bus-util.h"
+#include "dbus-util.h"
+#include "parse-util.h"
+#include "path-util.h"
+#include "unit-printf.h"
+#include "user-util.h"
+#include "unit.h"
+
+BUS_DEFINE_SET_TRANSIENT(mode_t, "u", uint32_t, mode_t, "%040o");
+BUS_DEFINE_SET_TRANSIENT(unsigned, "u", uint32_t, unsigned, "%" PRIu32);
+BUS_DEFINE_SET_TRANSIENT_STRING_WITH_CHECK(user, valid_user_group_name_or_id);
+BUS_DEFINE_SET_TRANSIENT_STRING_WITH_CHECK(path, path_is_absolute);
+
+int bus_set_transient_string(
+                Unit *u,
+                const char *name,
+                char **p,
+                sd_bus_message *message,
+                UnitWriteFlags flags,
+                sd_bus_error *error) {
+
+        const char *v;
+        int r;
+
+        assert(p);
+
+        r = sd_bus_message_read(message, "s", &v);
+        if (r < 0)
+                return r;
+
+        if (!UNIT_WRITE_FLAGS_NOOP(flags)) {
+                r = free_and_strdup(p, empty_to_null(v));
+                if (r < 0)
+                        return r;
+
+                unit_write_settingf(u, flags|UNIT_ESCAPE_SPECIFIERS, name,
+                                    "%s=%s", name, strempty(v));
+        }
+
+        return 1;
+}
+
+int bus_set_transient_bool(
+                Unit *u,
+                const char *name,
+                bool *p,
+                sd_bus_message *message,
+                UnitWriteFlags flags,
+                sd_bus_error *error) {
+
+        int v, r;
+
+        assert(p);
+
+        r = sd_bus_message_read(message, "b", &v);
+        if (r < 0)
+                return r;
+
+        if (!UNIT_WRITE_FLAGS_NOOP(flags)) {
+                *p = v;
+                unit_write_settingf(u, flags, name, "%s=%s", name, yes_no(v));
+        }
+
+        return 1;
+}
+
+int bus_set_transient_usec_internal(
+                Unit *u,
+                const char *name,
+                usec_t *p,
+                bool fix_0,
+                sd_bus_message *message,
+                UnitWriteFlags flags,
+                sd_bus_error *error) {
+
+        usec_t v;
+        int r;
+
+        assert(p);
+
+        r = sd_bus_message_read(message, "u", &v);
+        if (r < 0)
+                return r;
+
+        if (!UNIT_WRITE_FLAGS_NOOP(flags)) {
+                char *n, ts[FORMAT_TIMESPAN_MAX];
+
+                if (fix_0)
+                        *p = v ?: USEC_INFINITY;
+                else
+                        *p = v;
+
+                n = strndupa(name, strlen(name) - 4);
+                unit_write_settingf(u, flags, name, "%sSec=%s", n,
+                                    format_timespan(ts, sizeof(ts), v, USEC_PER_MSEC));
+        }
+
+        return 1;
+}