Move no_alias information to shared/

This way it can be used in install.c in subsequent commit.

src/core/automount.c

@@ -1050,7 +1050,6 @@ const UnitVTable automount_vtable = {
                 "Automount\0"
                 "Install\0",
 
-        .no_alias = true,
         .no_instances = true,
 
         .init = automount_init,

src/core/busname.c

@@ -1028,7 +1028,6 @@ const UnitVTable busname_vtable = {
                 "Install\0",
         .private_section = "BusName",
 
-        .no_alias = true,
         .no_instances = true,
 
         .init = busname_init,

src/core/load-fragment.c

@@ -3612,7 +3612,7 @@ static int load_from_path(Unit *u, const char *path) {
                 /* Hmm, no suitable file found? */
                 return 0;
 
-        if (UNIT_VTABLE(u)->no_alias && set_size(symlink_names) > 1) {
+        if (!unit_type_may_alias(u->type) && set_size(symlink_names) > 1) {
                 log_unit_warning(u, "Unit type of %s does not support alias names, refusing loading via symlink.", u->id);
                 return -ELOOP;
         }

src/core/mount.c

@@ -1839,7 +1839,6 @@ const UnitVTable mount_vtable = {
                 "Install\0",
         .private_section = "Mount",
 
-        .no_alias = true,
         .no_instances = true,
 
         .init = mount_init,

src/core/scope.c

@@ -569,7 +569,6 @@ const UnitVTable scope_vtable = {
                 "Install\0",
         .private_section = "Scope",
 
-        .no_alias = true,
         .no_instances = true,
         .can_transient = true,
 

src/core/slice.c

@@ -309,7 +309,6 @@ const UnitVTable slice_vtable = {
                 "Install\0",
         .private_section = "Slice",
 
-        .no_alias = true,
         .no_instances = true,
         .can_transient = true,
 

src/core/swap.c

@@ -1465,7 +1465,6 @@ const UnitVTable swap_vtable = {
                 "Install\0",
         .private_section = "Swap",
 
-        .no_alias = true,
         .no_instances = true,
 
         .init = swap_init,

src/core/unit.c

@@ -202,7 +202,7 @@ int unit_add_name(Unit *u, const char *text) {
         if (u->type != _UNIT_TYPE_INVALID && !u->instance != !i)
                 return -EINVAL;
 
-        if (unit_vtable[t]->no_alias && !set_isempty(u->names))
+        if (!unit_type_may_alias(t) && !set_isempty(u->names))
                 return -EEXIST;
 
         if (hashmap_size(u->manager->units) >= MANAGER_MAX_NAMES)
@@ -720,7 +720,7 @@ int unit_merge(Unit *u, Unit *other) {
         if (!u->instance != !other->instance)
                 return -EINVAL;
 
-        if (UNIT_VTABLE(u)->no_alias) /* Merging only applies to unit names that support aliases */
+        if (!unit_type_may_alias(u->type)) /* Merging only applies to unit names that support aliases */
                 return -EEXIST;
 
         if (other->load_state != UNIT_STUB &&

src/core/unit.h

@@ -416,9 +416,6 @@ struct UnitVTable {
         /* The strings to print in status messages */
         UnitStatusMessageFormats status_message_formats;
 
-        /* Can units of this type have multiple names? */
-        bool no_alias:1;
-
         /* Instances make no sense for this type */
         bool no_instances:1;
 

src/shared/install.c

@@ -68,6 +68,16 @@ typedef struct {
 
 static int unit_file_lookup_state(UnitFileScope scope, const LookupPaths *paths, const char *name, UnitFileState *ret);
 
+bool unit_type_may_alias(UnitType type) {
+        return IN_SET(type,
+                      UNIT_SERVICE,
+                      UNIT_SOCKET,
+                      UNIT_TARGET,
+                      UNIT_DEVICE,
+                      UNIT_TIMER,
+                      UNIT_PATH);
+}
+
 static int in_search_path(const LookupPaths *p, const char *path) {
         _cleanup_free_ char *parent = NULL;
         char **i;

src/shared/install.h

@@ -138,6 +138,8 @@ static inline bool UNIT_FILE_INSTALL_INFO_HAS_ALSO(UnitFileInstallInfo *i) {
         return !strv_isempty(i->also);
 }
 
+bool unit_type_may_alias(UnitType type) _const_;
+
 int unit_file_enable(
                 UnitFileScope scope,
                 bool runtime,