hostname: only suppress setting of pretty hostname if it is non-equal to the static hostname and if the static hostname is set, too

https://bugzilla.redhat.com/show_bug.cgi?id=957814

src/shared/util.c

@@ -3838,24 +3838,29 @@ bool hostname_is_valid(const char *s) {
         return true;
 }
 
-char* hostname_cleanup(char *s) {
+char* hostname_cleanup(char *s, bool lowercase) {
         char *p, *d;
         bool dot;
 
         for (p = s, d = s, dot = true; *p; p++) {
                 if (*p == '.') {
-                        if (dot || p[1] == 0)
+                        if (dot)
                                 continue;
 
+                        *(d++) = '.';
                         dot = true;
-                } else
+                } else if (hostname_valid_char(*p)) {
+                        *(d++) = lowercase ? tolower(*p) : *p;
                         dot = false;
+                }
 
-                if (hostname_valid_char(*p))
-                        *(d++) = *p;
         }
 
-        *d = 0;
+        if (dot && d > s)
+                d[-1] = 0;
+        else
+                *d = 0;
+
         strshorten(s, HOST_NAME_MAX);
 
         return s;

src/shared/util.h

@@ -411,7 +411,7 @@ bool nulstr_contains(const char*nulstr, const char *needle);
 bool plymouth_running(void);
 
 bool hostname_is_valid(const char *s) _pure_;
-char* hostname_cleanup(char *s);
+char* hostname_cleanup(char *s, bool lowercase);
 
 char* strshorten(char *s, size_t l);