Re: Yet another failure mode in pg_upgrade

Bruce Momjian <bruce@momjian.us> writes:
> +     /*
> +      *    Report the Unix domain socket directory location to the postmaster.
> +      */

"Report" seems entirely the wrong verb there.

> + #define LISTEN_STR    " -c listen_addresses=''"
> + 
> +     /* Have a sockdir to use? */
> +     if (strlen(os_info.sockdir) != 0)
> +         snprintf(socket_string, sizeof(socket_string) - strlen(LISTEN_STR),
> +             " -c %s='%s'",
> +             (GET_MAJOR_VERSION(cluster->major_version) < 903) ?
> +                 "unix_socket_directory" : "unix_socket_directories",
> +             os_info.sockdir);
> +     
> +     /* prevent TCP/IP connections */
> +     strcat(socket_string, LISTEN_STR);

IMO this would be simpler and more readable if you got rid of the LISTEN_STR
#define and just included -c listen_addresses='' in the snprintf format
string.  The comment for the whole thing should be something like
"If we have a socket directory to use, command the postmaster to use it,
and disable TCP/IP connections altogether".
        regards, tom lane