test: Do not hardcode root:root user and group names

On some systems the root group is named wheel, and there is no root
group.

diff --git a/test/pwcache.c b/test/pwcache.c
index d68ea4cbfe02cedf080120a02d635b7a8baf7260..ac1e67b42c453ea7252a5c4c6c8dbd6898d009eb 100644 (file)
--- a/test/pwcache.c
+++ b/test/pwcache.c
@@ -1,5 +1,5 @@
 /*
- * Copyright © 2021 Guillem Jover <guillem@hadrons.org>
+ * Copyright © 2021, 2023 Guillem Jover <guillem@hadrons.org>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -26,24 +26,48 @@
 
 #include <assert.h>
 #include <string.h>
+#include <stdlib.h>
 #include <pwd.h>
 #include <grp.h>
 
+#define TEST_SKIP      77
+
 int
 main(int argc, char **argv)
 {
+       struct group *gr;
+       struct passwd *pw;
+       char *uname;
+       char *gname;
        uid_t uid;
        gid_t gid;
 
-       assert(uid_from_user("root", &uid) == 0);
+       /* Do not hardcode user or group names. */
+       pw = getpwuid(0);
+       if (pw == NULL)
+               return TEST_SKIP;
+       uname = strdup(pw->pw_name);
+       assert(uname != NULL);
+
+       gr = getgrgid(0);
+       if (gr == NULL)
+               return TEST_SKIP;
+       gname = strdup(gr->gr_name);
+       assert(gname != NULL);
+
+       /* Test the functions. */
+       assert(uid_from_user(uname, &uid) == 0);
        assert(uid == 0);
 
-       assert(strcmp(user_from_uid(0, 0), "root") == 0);
+       assert(strcmp(user_from_uid(0, 0), uname) == 0);
 
-       assert(gid_from_group("root", &gid) == 0);
+       assert(gid_from_group(gname, &gid) == 0);
        assert(gid == 0);
 
-       assert(strcmp(group_from_gid(0, 0), "root") == 0);
+       assert(strcmp(group_from_gid(0, 0), gname) == 0);
+
+       free(uname);
+       free(gname);
 
        return 0;
 }