Adrian Klaver <adrian.klaver@aklaver.com> writes:
> Eventually got around to figuring that. So just for my reference, the
> code snippet I showed from postinit.c seems to show a path where a
> username is not used but is substituted with BOOTSTRAP_SUPERUSERID.
That's single-user mode.
> Am I following that correctly and what is BOOTSTRAP_SUPERUSERID?
BOOTSTRAP_SUPERUSERID is the OID of the precreated superuser.
The reason for that hack is to ensure you can still log in, in single-user
mode, even if you've done something stupid like "delete from pg_authid".
You'll be running under a user OID that doesn't actually exist in
pg_authid, but it won't matter because the code will believe you're a
superuser and will never go looking for the missing row. Then you
can create yourself a new superuser, and resolve not to do that again.
regards, tom lane
