DEFAULT_TLS_CERT_PATH should default to /etc/ssl/certs/ca-certificates.crt

[maddisondavid]

Problem description
DEFAULT_TLS_CERT_PATH is currently defaulted to ./certs which means that CA certs have to be manually added in order to communicate with the target system.

Problem location

pravega-client-rust/config/src/lib.rs

Line 49 in b57b2ea

const DEFAULT_TLS_CERT_PATH: &str = "./certs";

Suggestions for an improvement
On most Linux or containerized systems, the system-wide trust store is stored at /etc/ssl/certs/ca-certificates.crt and therefore it makes sense to default to this value so that the Python client may work out of the box. By defaulting to ./certs it guarantees it will never work out of the box without a user manually creating a truststore.

If a user requires a custom trust store or is running on Windows or another Linux distribution, they still have the option of specifying the trust store location using the pravega_client_tls_cert_path environment variable.