core: move check whether a unit is suitable to become transient into unit.c

Lets introduce unit_is_pristine() that verifies whether a unit is
suitable to become a transient unit, by checking that it is no
referenced yet and has no data on disk assigned.

1 files changed, 2 insertions, 0 deletions

diff --git a/src/core/unit.h b/src/core/unit.h
index bcf41d2348..a69d624fad 100644
--- a/src/core/unit.h
+++ b/src/core/unit.h
@@ -586,6 +586,8 @@ int unit_require_mounts_for(Unit *u, const char *path);
 
 bool unit_type_supported(UnitType t);
 
+bool unit_is_pristine(Unit *u);
+
 static inline bool unit_supported(Unit *u) {
         return unit_type_supported(u->type);
 }