Require #define variable ALLOW_ABSOLUTE_DBPATHS if absolute paths are

 allowed to be used for alternate database locations.
Probably best to default to not allowed, as now, since there are security
 and integrity issues which should be considered carefully before
 opening things up.
Will update docs to discuss this issue.

src/backend/utils/misc/database.c

@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/utils/misc/Attic/database.c,v 1.8 1998/04/27 04:07:41 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/utils/misc/Attic/database.c,v 1.9 1998/05/29 13:43:14 thomas Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -117,9 +117,13 @@ ExpandDatabasePath(char *dbpath)
 	/* leading path delimiter? then already absolute path */
 	if (*dbpath == SEP_CHAR)
 	{
+#ifdef ALLOW_ABSOLUTE_DBPATHS
 		cp = strrchr(dbpath, SEP_CHAR);
 		strncpy(buf, dbpath, (cp - dbpath));
 		sprintf(&buf[cp - dbpath], "%cbase%c%s", SEP_CHAR, SEP_CHAR, (cp + 1));
+#else
+		return NULL;
+#endif
 	}
 	/* path delimiter somewhere? then has leading environment variable */
 	else if (strchr(dbpath, SEP_CHAR) != NULL)