client: add a very basic Vala command line tool

.gitignore

@@ -3,3 +3,5 @@ systemd
 test-engine
 test-job-type
 systemd-logger
+systemctl
+systemctl.c

Makefile

@@ -29,7 +29,7 @@ COMMON= \
 	dbus-unit.o \
 	dbus-job.o
 
-all: systemd test-engine test-job-type systemd-logger
+all: systemd test-engine test-job-type systemd-logger systemctl
 
 systemd: main.o $(COMMON)
 	$(CC) $(CFLAGS) -o $@ $^  $(LIBS)
@@ -43,5 +43,8 @@ test-engine: test-engine.o $(COMMON)
 test-job-type: test-job-type.o $(COMMON)
 	$(CC) $(CFLAGS) -o $@ $^  $(LIBS)
 
+systemctl: systemctl.vala
+	valac --save-temps systemctl.vala --pkg=dbus-glib-1 --pkg=posix
+
 clean:
-	rm -f *.o systemd test-engine
+	rm -f *.o systemd test-engine systemctl

systemctl.vala

@@ -0,0 +1,134 @@
+using DBus;
+using GLib;
+
+[DBus (name = "org.freedesktop.systemd1")]
+public interface Manager : DBus.Object {
+
+        public struct UnitInfo {
+                string id;
+                string description;
+                string load_state;
+                string active_state;
+                ObjectPath unit_path;
+                uint32 job_id;
+                string job_type;
+                ObjectPath job_path;
+        }
+
+        public struct JobInfo {
+                uint32 id;
+                string name;
+                string type;
+                string state;
+                ObjectPath job_path;
+                ObjectPath unit_path;
+        }
+
+        public abstract UnitInfo[] ListUnits() throws DBus.Error;
+        public abstract JobInfo[] ListJobs() throws DBus.Error;
+
+        public abstract ObjectPath LoadUnit(string name) throws DBus.Error;
+}
+
+static string type = null;
+static bool all = false;
+
+public static int job_info_compare(void* key1, void* key2) {
+        Manager.JobInfo *j1 = (Manager.JobInfo*) key1;
+        Manager.JobInfo *j2 = (Manager.JobInfo*) key2;
+
+        return Posix.strcmp(j1->name, j2->name);
+}
+
+public static int unit_info_compare(void* key1, void* key2) {
+        Manager.UnitInfo *u1 = (Manager.UnitInfo*) key1;
+        Manager.UnitInfo *u2 = (Manager.UnitInfo*) key2;
+
+        int r = Posix.strcmp(Posix.strrchr(u1->id, '.'), Posix.strrchr(u2->id, '.'));
+        if (r != 0)
+                return r;
+
+        return Posix.strcmp(u1->id, u2->id);
+}
+
+static const OptionEntry entries[] = {
+        { "type", 't', 0, OptionArg.STRING, out type, "List only particular type of units", "TYPE" },
+        { "all",  'a', 0, OptionArg.NONE,   out all,  "Show all units, including dead ones", null  },
+        { null }
+};
+
+int main (string[] args) {
+
+        OptionContext context = new OptionContext(" -- Control systemd");
+        context.add_main_entries(entries, null);
+
+        try {
+                context.parse(ref args);
+        } catch (GLib.OptionError e) {
+                message("Failed to parse command line: %s".printf(e.message));
+        }
+
+        try {
+                Connection bus = Bus.get(BusType.SESSION);
+
+                Manager manager = bus.get_object (
+                                "org.freedesktop.systemd1",
+                                "/org/freedesktop/systemd1",
+                                "org.freedesktop.systemd1") as Manager;
+
+                if (args[1] == "list-units" || args.length <= 1) {
+                        var list = manager.ListUnits();
+                        uint n = 0;
+                        Posix.qsort(list, list.length, sizeof(Manager.UnitInfo), unit_info_compare);
+
+                        stdout.printf("%-45s %-6s %-12s → %-15s\n\n", "UNIT", "LOAD", "ACTIVE", "JOB");
+
+                        foreach (var i in list) {
+
+                                if (type != null && !i.id.has_suffix(".%s".printf(type)))
+                                        continue;
+
+                                if (!all && i.active_state == "inactive")
+                                        continue;
+
+                                stdout.printf("%-45s %-6s %-12s", i.id, i.load_state, i.active_state);
+
+                                if (i.job_id != 0)
+                                        stdout.printf("→ %-15s", i.job_type);
+
+                                stdout.puts("\n");
+                                n++;
+                        }
+
+                        if (all)
+                                stdout.printf("\n%u units listed.\n", n);
+                        else
+                                stdout.printf("\n%u live units listed. Pass --all to see dead units, too.\n", n);
+
+
+                } else if (args[1] == "list-jobs") {
+                        var list = manager.ListJobs();
+                        Posix.qsort(list, list.length, sizeof(Manager.JobInfo), job_info_compare);
+
+                        foreach (var i in list)
+                                stdout.printf("%-45s → %-15s %-7s\n", i.name, i.type, i.state);
+
+                } else if (args[1] == "load") {
+
+                        if (args.length < 3) {
+                                stderr.printf("Missing argument.\n");
+                                return 1;
+                        }
+
+                        manager.LoadUnit(args[2]);
+                } else {
+                        stderr.printf("Unknown command %s.\n", args[1]);
+                        return 1;
+                }
+
+        } catch (DBus.Error e) {
+                stderr.printf("%s\n".printf(e.message));
+        }
+
+        return 0;
+}