manager: rework generator logic

Previously generated units were always placed at the end of the search
path. With this change there will be three unit dirs instead of one, to
place generated entries at the beginning, in the middle and at the end
of the search path:

beginning: for units that need to override all configuration, regardless
of user or vendor. Example use: system-update-generator uses this to
temporarily redirect default.target.

middle: for units that need to override vendor configuration, but not
vendor configuration. Example use: /etc/fstab should override vendor
supplied configuration (think /tmp), but should not override native user
configuration.

end: does not override anything but is available as well. Possible usage
might be to convert D-Bus bus service files to native units but allowing
vendor supplied native units to win.

1 files changed, 4 insertions, 0 deletions

diff --git a/src/shared/strv.h b/src/shared/strv.h
index afb31f385f..635e92b728 100644
--- a/src/shared/strv.h
+++ b/src/shared/strv.h
@@ -47,6 +47,10 @@ char **strv_uniq(char **l);
 char **strv_new(const char *x, ...) _sentinel_ _malloc_;
 char **strv_new_ap(const char *x, va_list ap) _malloc_;
 
+static inline const char* STRV_IFNOTNULL(const char *x) {
+        return x ? x : (const char *) -1;
+}
+
 static inline bool strv_isempty(char **l) {
         return !l || !*l;
 }