When deploying revision 73 of the charm with the SELFSIGNED option the hook fails not being able to create the certificate:
root@landscapeha-1:/var/lib/juju/agents/unit-landscape-server-haproxy-0/charm# ./hooks/reverseproxy-relation-changed
Generating a RSA private key
...........+++++
....................+++++
writing new private key to '/var/lib/haproxy/selfsigned.key'
-----
Cannot write random bytes:
139901954950464:error:2407007A:random number generator:RAND_write_file:Not a regular file:../crypto/rand/randfile.c:183:Filename=/dev/urandom
./hooks/reverseproxy-relation-changed:331: YAMLLoadWarning: calling yaml.load() without Loader=... is deprecated, as the default Loader is unsafe. Please read https://msg.pyyaml.org/load for full details.
sysctl_dict = yaml.load(config_data.get("sysctl", "{}"))
Generating a RSA private key
........+++++
.......+++++
writing new private key to '/var/lib/haproxy/selfsigned.key'
-----
Cannot write random bytes:
140448263198016:error:2407007A:random number generator:RAND_write_file:Not a regular file:../crypto/rand/randfile.c:183:Filename=/dev/urandom
Traceback (most recent call last):
File "./hooks/reverseproxy-relation-changed", line 1575, in <module>
main(hook_name)
File "./hooks/reverseproxy-relation-changed", line 1542, in main
reverseproxy_interface("changed")
File "./hooks/reverseproxy-relation-changed", line 1095, in reverseproxy_interface
config_changed()
File "./hooks/reverseproxy-relation-changed", line 1036, in config_changed
update_ssl_cert(config_data)
File "./hooks/reverseproxy-relation-changed", line 361, in update_ssl_cert
write_ssl_pem(pem_path, content)
File "./hooks/reverseproxy-relation-changed", line 1444, in write_ssl_pem
f.write(content.decode('utf-8'))
AttributeError: 'str' object has no attribute 'decode'
I was able to reproduce this bug again with this bundle: https://pastebin.ubuntu.com/p/GMd3jV6Qtg/
This has been fixed in revision 74, which has been released to the stable channel