core: add transient units

Transient units can be created via the bus API. They are configured via
the method call parameters rather than on-disk files. They are subject
to normal GC. Transient units currently may only be created for
services (however, we will extend this), and currently only ExecStart=
and the cgroup parameters can be configured (also to be extended).

Transient units require a unique name, that previously had no
configuration file on disk.

A tool systemd-run is added that makes use of this functionality to run
arbitrary command lines as transient services:

$ systemd-run /bin/ping www.heise.de

Will cause systemd to create a new transient service and run ping in it.

1 files changed, 14 insertions, 2 deletions

diff --git a/src/core/manager.c b/src/core/manager.c
index 6ba51a4116..42c9bcd48c 100644
--- a/src/core/manager.c
+++ b/src/core/manager.c
@@ -993,7 +993,13 @@ unsigned manager_dispatch_load_queue(Manager *m) {
         return n;
 }
 
-int manager_load_unit_prepare(Manager *m, const char *name, const char *path, DBusError *e, Unit **_ret) {
+int manager_load_unit_prepare(
+                Manager *m,
+                const char *name,
+                const char *path,
+                DBusError *e,
+                Unit **_ret) {
+
         Unit *ret;
         UnitType t;
         int r;
@@ -1053,7 +1059,13 @@ int manager_load_unit_prepare(Manager *m, const char *name, const char *path, DB
         return 0;
 }
 
-int manager_load_unit(Manager *m, const char *name, const char *path, DBusError *e, Unit **_ret) {
+int manager_load_unit(
+                Manager *m,
+                const char *name,
+                const char *path,
+                DBusError *e,
+                Unit **_ret) {
+
         int r;
 
         assert(m);