systemctl: append default suffix only if none present

Simplify unit_name_mangle() and unit_name_mangle_with_suffix() to
always behave the same, and only append a suffix if there is no
type suffix. If a user says 'isolate blah.device' it is better to
return an error that the type cannot be isolated, than to try to
isolate blah.device.target.

(cherry picked from commit 5e03c6e3b5)

src/shared/unit-name.c

@@ -502,37 +502,11 @@ int unit_name_from_dbus_path(const char *path, char **name) {
 }
 
 /**
- *  Try to turn a string that might not be a unit name into a
- *  sensible unit name.
- */
-char *unit_name_mangle(const char *name, enum unit_name_mangle allow_globs) {
-        char *r, *t;
-
-        assert(name);
-
-        if (is_device_path(name))
-                return unit_name_from_path(name, ".device");
-
-        if (path_is_absolute(name))
-                return unit_name_from_path(name, ".mount");
-
-        r = new(char, strlen(name) * 4 + strlen(".service") + 1);
-        if (!r)
-                return NULL;
-
-        t = do_escape_mangle(name, allow_globs, r);
-
-        if (unit_name_to_type(name) < 0)
-                strcpy(t, ".service");
-        else
-                *t = 0;
-
-        return r;
-}
-
-/**
- *  Similar to unit_name_mangle(), but is called when we know
- *  that this is about a specific unit type.
+ *  Convert a string to a unit name. /dev/blah is converted to dev-blah.device,
+ *  /blah/blah is converted to blah-blah.mount, anything else is left alone,
+ *  except that @suffix is appended if a valid unit suffix is not present.
+ *
+ *  If @allow_globs, globs characters are preserved. Otherwise they are escaped.
  */
 char *unit_name_mangle_with_suffix(const char *name, enum unit_name_mangle allow_globs, const char *suffix) {
         char *r, *t;
@@ -541,13 +515,19 @@ char *unit_name_mangle_with_suffix(const char *name, enum unit_name_mangle allow
         assert(suffix);
         assert(suffix[0] == '.');
 
+        if (is_device_path(name))
+                return unit_name_from_path(name, ".device");
+
+        if (path_is_absolute(name))
+                return unit_name_from_path(name, ".mount");
+
         r = new(char, strlen(name) * 4 + strlen(suffix) + 1);
         if (!r)
                 return NULL;
 
         t = do_escape_mangle(name, allow_globs, r);
 
-        if (!endswith(name, suffix))
+        if (unit_name_to_type(name) < 0)
                 strcpy(t, suffix);
         else
                 *t = 0;

src/shared/unit-name.h

@@ -156,8 +156,10 @@ enum unit_name_mangle {
         MANGLE_GLOB,
 };
 
-char *unit_name_mangle(const char *name, enum unit_name_mangle allow_globs);
 char *unit_name_mangle_with_suffix(const char *name, enum unit_name_mangle allow_globs, const char *suffix);
+static inline char *unit_name_mangle(const char *name, enum unit_name_mangle allow_globs) {
+        return unit_name_mangle_with_suffix(name, allow_globs, ".service");
+}
 
 int build_subslice(const char *slice, const char*name, char **subslice);
 

src/systemctl/systemctl.c

@@ -2700,10 +2700,7 @@ static int expand_names(sd_bus *bus, char **names, const char* suffix, char ***r
         STRV_FOREACH(name, names) {
                 char *t;
 
-                if (suffix)
-                        t = unit_name_mangle_with_suffix(*name, MANGLE_GLOB, suffix);
-                else
-                        t = unit_name_mangle(*name, MANGLE_GLOB);
+                t = unit_name_mangle_with_suffix(*name, MANGLE_GLOB, suffix);
                 if (!t)
                         return log_oom();