BUG #6189: libpq: sslmode=require verifies server certificate if root.crt is present

The following bug has been logged online:

Bug reference:      6189
Logged by:          Srinivas Aji
Email address:      srinivas.aji@emc.com
PostgreSQL version: 9.0.4
Operating system:   Linux
Description:        libpq: sslmode=require verifies server certificate if
root.crt is present
Details:

From the documentation of sslmode values in
http://www.postgresql.org/docs/9.0/static/libpq-ssl.html ,
it looks like libpq will not verify the server certificate when the option
sslmode=require is used, and will perform different levels of certificate
verification in the cases sslmode=verify-ca and sslmode=verify-full.

The observed behaviour is a bit different. If the ~/.postgresql/root.crt
file (or any other filename set through sslrootcert option) is found,
sslmode=require also performs the same level of certificate verification as
verify-ca. The difference between require and verify-ca is that it is an
error for the file to not exist when sslmode is verify-ca.

Thanks,
Srinivas