Reject missing database name in pg_regress and cohorts.

Writing "pg_regress --dbname= ..." led to a crash, because
we weren't expecting there to be no database name supplied.
It doesn't seem like a great idea to run regression tests
in whatever is the user's default database; so rather than
supporting this case let's explicitly reject it.

Per report from Xing Guo.  Back-patch to all supported
branches.

Discussion: https://postgr.es/m/CACpMh+A8cRvtvtOWVAZsCM1DU81GK4DL26R83y6ugZ1osV=ifA@mail.gmail.com

diff --git a/src/test/regress/pg_regress.c b/src/test/regress/pg_regress.c
index dda076847a38a74a765ca1283226815e9d10ada1..f308da6c5034c43eaa0977d80c98859e23101343 100644 (file)
--- a/src/test/regress/pg_regress.c
+++ b/src/test/regress/pg_regress.c
@@ -2182,6 +2182,17 @@ regression_main(int argc, char *argv[],
        optind++;
    }
 
+   /*
+    * We must have a database to run the tests in; either a default name, or
+    * one supplied by the --dbname switch.
+    */
+   if (!(dblist && dblist->str && dblist->str[0]))
+   {
+       fprintf(stderr, _("%s: no database name was specified\n"),
+               progname);
+       exit(2);
+   }
+
    if (config_auth_datadir)
    {
 #ifdef ENABLE_SSPI