signing.bbclass: don't export OPENSSL environment variables globally

OPENSSL_{MODULES,ENGINES,CONF} and SSL_CERT_{DIR,FILE} are currently
exported globally for any recipe that inherits signing. This not only
affects the tasks that use the signing infrastructure, but also unrelated
tasks like e.g. do_fetch. Avoid this by exporting the variables only
for these tasks that actually call signing_prepare.

This resolves a breakage I observed on Ubuntu 18.04, where the host
tool wget is called with the environment variables set and then fails
with a SSL error (exit code 5).

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

0 files changed, 0 insertions, 0 deletions