BUG #14872: libpq requires a home directory

The following bug has been logged on the website:

Bug reference: 14872
Logged by: Dan Watson
Email address: dcwatson(at)gmail(dot)com
PostgreSQL version: 10.0
Operating system: Linux
Description:

Hello,

It seems a side effect of allowing a pgpass file to be specified in libpq
connections[1] is that libpq errors out if a home directory cannot be found.
I'm building docker images for OpenShift which run as unnamed users without
a home directory, and since upgrading to the latest psycopg2 (which is built
against libpq 10), I get an error saying "Could not get home directory to
locate password file". I think I've traced it to the referenced commit, and
was hoping to get some confirmation that this was indeed an unintended side
effect. Seems like the absence of a home directory should not be an error
condition, just don't look for pgpass in the default location in that
case.

Regards,
Dan

[1]
https://github.com/postgres/postgres/commit/ba005f193d88a8404e81db3df223cf689d64d75e