By default the Slack::Web::Client looks to /usr/lib/ssl/cert.pem to set the ca_file and ca_path but there is no such file in Ubuntu. We need Slack::Web::Client to look for /etc/ssl/certs/ca-certificates.crt instead.
The default behavior is basically this where OpenSSL::X509::DEFAULT_CERT_FILE and OpenSSL::X509::DEFAULT_CERT_DIR return the wrong locations for Ubuntu:
client = Slack::Web::Client.new(ca_file: OpenSSL::X509::DEFAULT_CERT_FILE, ca_path: OpenSSL::X509::DEFAULT_CERT_DIR)
It's possible that setting SSL_CERT_FILE=/etc/ssl/certs/ca-certificates.crt will fix it but we'd need to test that.
By default the
Slack::Web::Clientlooks to/usr/lib/ssl/cert.pemto set theca_fileandca_pathbut there is no such file in Ubuntu. We needSlack::Web::Clientto look for/etc/ssl/certs/ca-certificates.crtinstead.The default behavior is basically this where
OpenSSL::X509::DEFAULT_CERT_FILEandOpenSSL::X509::DEFAULT_CERT_DIRreturn the wrong locations for Ubuntu:client = Slack::Web::Client.new(ca_file: OpenSSL::X509::DEFAULT_CERT_FILE, ca_path: OpenSSL::X509::DEFAULT_CERT_DIR)It's possible that setting
SSL_CERT_FILE=/etc/ssl/certs/ca-certificates.crtwill fix it but we'd need to test that.